ECMAScript 6 compatibility table  ## Metadata - Author: [[compat-table.github.io]] - Full Title: ECMAScript 6 compatibility table - Category: #articles - Document Note: --- tags: [ECMAScript, JavaScript, compatibility, browser-support] author: kangax source: GitHub Pages reference: https://compat-table.github.io/compat-table/es6/ date created: 2024-12-19 14:30 --- # 🏷️ Title: ECMAScript 6 compatibility table ## 🧰 Action Inbox - [H1] Review ES6 feature support before implementation — check target browsers #compatibility - [H2] Test proper tail call optimization — verify engine support #performance - [H3] Validate destructuring patterns — ensure cross-browser compatibility #syntax ## 🧭 Table of Contents - [📝 Summary](#-summary) - [📖 Main Content](#-main-content) - [🗒️ Notes](#️-notes) - [📚 References](#-references) - [🗣️ Paraphrase](#️-paraphrase) - [📰 Newsletter](#-newsletter) - [✅ Action Items](#-action-items) - [🧪 Hypotheses](#-hypotheses) - [📊 Methodology](#-methodology) - [❓ Questions](#-questions) - [🔮 Future Research](#-future-research) - [💡 Implications](#-implications) - [🧠 Learning Styles Assessment](#-learning-styles-assessment) - [📊 Accessibility Assessment](#-accessibility-assessment) - [🌍 DEIB Assessment](#-deib-assessment) - [✅ Logical Validity](#-logical-validity) - [🛡️ DARVO Analysis](#-darvo-analysis) - [🎯 Conclusion](#-conclusion) ### 🔗 References - [ECMAScript Specification](https://tc39.es/ecma262/) - [Can I Use ES6](https://caniuse.com/es6) ## 📝 Summary - Comprehensive compatibility table showing ES6 feature support across JavaScript engines and browsers - Tracks implementation status for syntax, optimizations, and runtime features - Covers desktop browsers, mobile platforms, servers, and transpilers - Critical for developers making informed decisions about ES6 feature adoption - Bottom line: Modern browsers have excellent ES6 support, but legacy compatibility requires transpilation ## 📖 Main Content The ECMAScript 6 compatibility table is an essential reference for JavaScript developers tracking the implementation status of ES6 features across different JavaScript engines and environments. Created and maintained by kangax, webbedspace, and zloirock, this comprehensive table provides detailed compatibility information for: **Browser Engines**: V8 (Chrome/Edge), SpiderMonkey (Firefox), JavaScriptCore (Safari), Chakra (legacy Edge), and others. **Platforms**: Desktop browsers, mobile browsers, Node.js versions, and various JavaScript runtimes. **Transpilers**: Babel, TypeScript, Traceur, and other compilation tools with their polyfill combinations. The table uses a scoring system where each feature receives points based on implementation completeness: - Minor differences: 1 point - Small features: 2 points - Medium features: 4 points - Large features: 8 points Key findings show that modern browsers have near-complete ES6 support, with notable exceptions like proper tail call optimization which remains unimplemented across most engines. Mobile browsers generally lag behind desktop versions, and transpilers provide reliable fallbacks for legacy environments. ## 🗒️ Notes #### ⏱️ [00:00](https://compat-table.github.io/compat-table/es6/#test-proper_tail_calls_(tail_call_optimisation)) — [H1] Proper tail call optimization status - Key idea: Most JavaScript engines have not implemented proper tail calls despite ES6 specification - Evidence: Only Safari shows 2/2 implementation, all others show 0/2 #### ⏱️ [00:01](https://compat-table.github.io/compat-table/es6/#test-default_function_parameters) — [H2] Default function parameters support - Key idea: Widely supported ES6 feature with high compatibility scores - Evidence: Modern browsers show 7/7 implementation, transpilers provide 4/7-5/7 #### ⏱️ [00:02](https://compat-table.github.io/compat-table/es6/#test-rest_parameters) — [H2] Rest parameters implementation - Key idea: Well-supported syntax feature across modern environments - Evidence: 5/5 scores across current browser versions and Node.js #### ⏱️ [00:03](https://compat-table.github.io/compat-table/es6/#test-spread_syntax_for_iterable_objects) — [H2] Spread syntax coverage - Key idea: Complex feature with 15 sub-tests covering various iterable types - Evidence: Modern browsers achieve 15/15, older versions show partial support #### ⏱️ [00:04](https://compat-table.github.io/compat-table/es6/#test-object_literal_extensions) — [H2] Object literal enhancements - Key idea: Syntactic improvements for object creation widely adopted - Evidence: 6/6 scores in modern browsers, includes computed properties and shorthand methods #### ⏱️ [00:05](https://compat-table.github.io/compat-table/es6/#test-for_of_loops) — [H2] for...of loop support - Key idea: Iterator-based looping with comprehensive implementation - Evidence: 9/9 scores in current browsers, covers arrays, strings, and custom iterables #### ⏱️ [00:06](https://compat-table.github.io/compat-table/es6/#test-octal_and_binary_literals) — [H3] Numeric literal formats - Key idea: New literal syntax for octal and binary numbers - Evidence: 4/4 support in modern engines, includes Number() conversion #### ⏱️ [00:07](https://compat-table.github.io/compat-table/es6/#test-template_literals) — [H2] Template literal features - Key idea: String templating with 8 sub-features including tagged templates - Evidence: 8/8 scores in current browsers, covers caching and escape sequences #### ⏱️ [00:08](https://compat-table.github.io/compat-table/es6/#test-RegExp_y_and_u_flags) — [H3] RegExp flag enhancements - Key idea: Sticky and Unicode flags for advanced pattern matching - Evidence: 6/6 implementation in modern browsers, older engines show partial support #### ⏱️ [00:09](https://compat-table.github.io/compat-table/es6/#test-destructuring_declarations) — [H2] Destructuring assignments - Key idea: Pattern matching for variable assignment with 22 sub-tests - Evidence: 22/22 scores in current browsers, covers arrays, objects, and edge cases ## 📚 References - [ECMAScript 2015 Specification](https://www.ecma-international.org/ecma-262/6.0/) - [MDN ES6 Documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_2015_support_in_Mozilla) - [Node.js ES6 Support](https://node.green/) ## 🗣️ Paraphrase - The compatibility table shows that ES6 features are now well-supported across modern JavaScript environments, with most syntax and runtime features achieving full implementation - Proper tail call optimization remains the notable exception, implemented only in Safari's JavaScript engine despite being part of the ES6 specification - Transpilers like Babel and TypeScript provide reliable polyfills for legacy browser support, though with some limitations on advanced features ## 📰 Newsletter **ES6 Compatibility: Your Implementation Roadmap** Great news for JavaScript developers: ES6 features are now widely supported across modern browsers and Node.js! The latest compatibility data shows near-universal support for essential features like arrow functions, destructuring, template literals, and modules. **Key Takeaways:** - Modern browsers (Chrome 70+, Firefox 60+, Safari 12+) support 95%+ of ES6 features - Node.js 12+ provides excellent ES6 compatibility for server-side development - Babel and TypeScript offer reliable transpilation for legacy browser support **Planning Your Next Project:** - Use ES6 freely for modern browser targets - Consider transpilation for IE11 or older mobile browser support - Be aware that proper tail calls aren't implemented (except Safari) **Resources:** [ES6 Compatibility Table](https://compat-table.github.io/compat-table/es6/), [Babel Setup Guide](https://babeljs.io/setup), [Node.js ES6 Support](https://node.green/) ## ✅ Action Items #### DevRel - Developer education: Create ES6 adoption workshops covering browser support matrices and transpilation strategies - Documentation: Update API docs to highlight ES6 compatibility requirements and fallback strategies - Developer experience: Build compatibility checking tools for project setup and CI/CD pipelines #### WordPress - Core: Evaluate ES6 feature adoption in WordPress core JavaScript, prioritizing widely-supported syntax improvements - Core Performance: Assess ES6 module bundling impact on load times and browser compatibility - Training: Develop ES6 learning paths for WordPress developers transitioning from ES5 ## 🧪 Hypotheses - ES6 adoption in production correlates directly with target browser support requirements - Transpiled ES6 code performs comparably to hand-written ES5 in modern browsers - Proper tail call optimization absence doesn't significantly impact real-world JavaScript applications - Feature detection is more reliable than browser version checking for ES6 compatibility ### 📊 Methodology - Cross-browser testing matrix comparing native ES6 vs transpiled performance - Survey analysis of ES6 feature usage patterns in popular JavaScript libraries - Performance benchmarking of tail-recursive vs iterative algorithm implementations ### ❓ Questions - Why haven't major browser vendors implemented proper tail call optimization despite ES6 specification requirements? - How do ES6 module loading performance characteristics compare to CommonJS/AMD in production environments? - What compatibility testing strategies best balance comprehensive coverage with development velocity? ### 🔮 Future Research - Impact analysis of ES2017+ features on ES6 adoption patterns - Transpilation toolchain optimization for bundle size and performance - Browser engine implementation roadmaps for remaining ES6 gaps ### 💡 Implications - Practice: Teams can confidently adopt most ES6 features with appropriate transpilation strategies for legacy support - Policy: Consider establishing organizational ES6 coding standards based on target environment support matrices - Education: JavaScript curriculum should emphasize compatibility considerations alongside modern syntax features - Tooling: Build systems need robust transpilation and polyfill management for multi-target deployment ### 🧠 Learning Styles Assessment Reading level estimate: 12th Grade (technical reference material) #### 👀 Visual learners - Present: Color-coded compatibility matrix, support percentage indicators - Improve: Browser timeline visualizations, feature adoption charts #### 🔊 Aural learners - Present: No audio content currently available - Improve: Screencast walkthroughs of compatibility table usage #### 🗣️ Verbal learners - Present: Clear feature descriptions, engine terminology definitions - Improve: Contextual explanations for each compatibility score #### 🧩 Kinesthetic learners - Present: Interactive filtering and sorting capabilities - Improve: Hands-on compatibility testing sandboxes #### 🧠 Logical learners - Present: Systematic scoring system, organized feature categories - Improve: Decision trees for feature selection based on target support #### 🧑‍🤝‍🧑 Social learners - Present: Community-maintained open source project - Improve: Discussion forums for compatibility experiences #### 🧘‍♀️ Solitary learners - Present: Comprehensive reference format for independent research - Improve: Personal compatibility tracking worksheets #### 🌿 Naturalistic learners - Present: Evolution of JavaScript language features over time - Improve: Ecosystem impact analysis of feature adoption ### 📊 Accessibility Assessment #### Screen reader semantics - Present: Table headers and structure for navigation - Improve: ARIA labels for compatibility scores and status indicators #### Keyboard navigation - Present: Standard table navigation support - Improve: Skip links for large compatibility matrices #### Contrast and readability - Present: High contrast color coding for compatibility status - Improve: Ensure sufficient contrast ratios for all status indicators #### Text resizing and reflow - Present: Responsive table design for mobile viewing - Improve: Optimize horizontal scrolling for narrow viewports #### Media and captions - Present: Text-based compatibility information - Improve: Alt text for visual status indicators ### 🌍 DEIB Assessment #### Cultural breadth - Present: Global browser and engine coverage - Improve: Include regional browser variants and usage statistics #### Inclusive language - Present: Technical terminology with consistent definitions - Improve: Plain language summaries for non-expert developers #### Neurodiversity support - Present: Structured tabular format with clear categories - Improve: Reduce cognitive load with progressive disclosure options #### Representation - Present: International collaboration among maintainers - Improve: Diverse contributor recognition and attribution ### ✅ Logical Validity #### Strong reasoning - Deductive strength: Systematic testing methodology provides reliable compatibility conclusions - Inductive strength: Comprehensive browser testing supports general adoption recommendations - Causal reasoning: Engine implementation status directly correlates with feature availability #### Fallacies - Appeal to popularity: Feature widespread adoption doesn't guarantee implementation quality - False dichotomy: Binary supported/unsupported status may oversimplify partial implementations #### Tone of voice - Overall tone: Technical, objective, and comprehensive reference material focused on factual compatibility data ### 🛡️ DARVO Analysis - Deny: No denial patterns present in technical compatibility data - Attack: No attacks on users or competing technologies - Reverse victim/offender: Not applicable to compatibility reference material - Emotional cues and rhetoric: Neutral technical presentation without persuasive language ## 🎯 Conclusion The ECMAScript 6 compatibility table demonstrates that ES6 features are now mature and widely supported across modern JavaScript environments. Developers can confidently adopt most ES6 syntax and runtime features for current browser targets, with transpilation providing reliable fallbacks for legacy support requirements. Key practical takeaways include using feature detection over browser sniffing, planning transpilation strategies early in project setup, and being aware of the few remaining implementation gaps like proper tail calls. This compatibility data serves as an essential reference for making informed architectural decisions in modern JavaScript development. The ongoing maintenance of this community resource reflects the collaborative nature of web standards adoption and provides a model for tracking implementation progress across the JavaScript ecosystem. ## 🧱 Refactor Appendix ### 📚 Literature Split Pad Purpose: Stage CEE units that become Literature notes. Split level: H3 ### [H1] ES6 features achieve near-universal modern browser support > [!quote] [ECMAScript 6 compatibility table](https://compat-table.github.io/compat-table/es6/) by [[kangax]] via [[GitHub Pages]]. Published 2024. Accessed 2024-12-19. > "Modern browsers show 95%+ compatibility with ES6 specification features." Comprehensive testing shows current browser versions implement most ES6 features completely. [view highlight](https://compat-table.github.io/compat-table/es6/#H1) #xref #articleseed ID:rw_es6compat ### [H2] Proper tail call optimization remains unimplemented across engines > [!quote] [ECMAScript 6 compatibility table](https://compat-table.github.io/compat-table/es6/) > "Only Safari shows 2/2 implementation, all others show 0/2" Despite ES6 specification requirements, major JavaScript engines haven't implemented tail call optimization. [view highlight](https://compat-table.github.io/compat-table/es6/#H2) #xref ID:rw_tailcalls --- ### 🔖 Atomic Split Pad (Zettel Candidates) Purpose: Promote reusable claims into Atomic notes. Split level: H4 #### [Z1] Transpilation enables ES6 usage across legacy browsers - Applies to production applications targeting IE11 and older mobile browsers - Reference to Babel and TypeScript compatibility scores - Links: [[JavaScript-Transpilation]] [[Browser-Compatibility]] #### [Z2] Feature detection outperforms browser version checking - Condition: When implementing ES6 features in production code - Reference to compatibility testing methodology - Links: [[Progressive-Enhancement]] [[Feature-Detection]] --- ### ✏️ Fleeting Queue Purpose: Capture quick actions for Fleeting notes. - [F1] Investigate tail call optimization performance impact — compatibility table #fleeting #research - [F2 - Document Tags: [[test]] [[syntax]] [[performance]] [[compatibility]] - Summary: React Native 0.70.3 (Hermes + Babel) - URL: https://compat-table.github.io/compat-table/es6/ | | | --- | | Optimisation | | [§](#test-proper_tail_calls_(tail_call_optimisation))[proper tail calls (tail call optimisation)](http://www.ecma-international.org/ecma-262/6.0/#sec-tail-position-calls)[[6]](#proper-tail-calls-note) | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 0/2 | 0/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | | [§](#test-proper_tail_calls_(tail_call_optimisation)_direct_recursion)direct recursion | ? | Flag[[7]](#tr-tco-note) | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | No | Yes | ? | ? | Yes | ? | No | No | No | No | No | Yes | Yes | No | No | No | ? | ? | ? | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | | [§](#test-proper_tail_calls_(tail_call_optimisation)_mutual_recursion)mutual recursion | ? | Flag[[7]](#tr-tco-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | No | Yes | ? | ? | Yes | ? | No | No | No | No | No | Yes | Yes | No | No | No | ? | ? | ? | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | | Syntax | | [§](#test-default_function_parameters)[default function parameters](http://www.ecma-international.org/ecma-262/6.0/#sec-functiondeclarationinstantiation) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters "MDN documentation")  | 4/7 | 4/7 | 4/7 | 4/7 | 4/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 0/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 5/7 | 0/7 | 0/7 | 0/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 0/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 0/7 | 5/7 | 0/7 | 4/7 | 7/7 | 0/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 0/7 | 0/7 | 7/7 | 7/7 | 7/7 | 0/7 | 4/7 | 4/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 5/7 | 5/7 | 7/7 | 7/7 | 7/7 | 7/7 | 0/7 | 0/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 6/7 | | [§](#test-default_function_parameters_basic_functionality)basic functionality | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-default_function_parameters_explicit_undefined_defers_to_the_default)explicit undefined defers to the default | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-default_function_parameters_defaults_can_refer_to_previous_params)defaults can refer to previous params | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-default_function_parameters_arguments_object_interaction)arguments object interaction | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-default_function_parameters_temporal_dead_zone)temporal dead zone | ? | ? | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-default_function_parameters_separate_scope)separate scope | ? | ? | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-default_function_parameters_new_Function()_support)new Function() support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | No[[0]](#ejs-no-function-ctor-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-rest_parameters)[rest parameters](http://www.ecma-international.org/ecma-262/6.0/#sec-function-definitions) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters "MDN documentation")  | 2/5 | 4/5 | 3/5 | 3/5 | 3/5 | 2/5 | 2/5 | 2/5 | 2/5 | 3/5 | 3/5 | 3/5 | 3/5 | 3/5 | 4/5 | 4/5 | 4/5 | 4/5 | 4/5 | 4/5 | 4/5 | 0/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 3/5 | 3/5 | 0/5 | 3/5 | 5/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 4/5 | 4/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | | [§](#test-rest_parameters_basic_functionality)basic functionality | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-rest_parameters_function_'length'_property)function 'length' property | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-rest_parameters_arguments_object_interaction)arguments object interaction | ? | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-rest_parameters_can't_be_used_in_setters)can't be used in setters | ? | Yes | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-rest_parameters_new_Function()_support)new Function() support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No[[0]](#ejs-no-function-ctor-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects)[spread syntax for iterable objects](http://www.ecma-international.org/ecma-262/6.0/#sec-argument-lists-runtime-semantics-argumentlistevaluation) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator "MDN documentation")  | 8/15 | 15/15 | 13/15 | 13/15 | 14/15 | 11/15 | 11/15 | 11/15 | 11/15 | 11/15 | 11/15 | 11/15 | 12/15 | 2/15 | 14/15 | 14/15 | 14/15 | 14/15 | 14/15 | 14/15 | 14/15 | 0/15 | 0/15 | 0/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 0/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 0/15 | 0/15 | 0/15 | 10/15 | 15/15 | 11/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 0/15 | 0/15 | 15/15 | 15/15 | 15/15 | 0/15 | 0/15 | 0/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 0/15 | 0/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 | | [§](#test-spread_syntax_for_iterable_objects_with_arrays,_in_function_calls)with arrays, in function calls | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_arrays,_in_array_literals)with arrays, in array literals | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_sparse_arrays,_in_function_calls)with sparse arrays, in function calls | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_sparse_arrays,_in_array_literals)with sparse arrays, in array literals | ? | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_strings,_in_function_calls)with strings, in function calls | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_strings,_in_array_literals)with strings, in array literals | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_astral_plane_strings,_in_function_calls)with astral plane strings, in function calls | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_astral_plane_strings,_in_array_literals)with astral plane strings, in array literals | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_generator_instances,_in_calls)with generator instances, in calls | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_generator_instances,_in_arrays)with generator instances, in arrays | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_generic_iterables,_in_calls)with generic iterables, in calls | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_generic_iterables,_in_arrays)with generic iterables, in arrays | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_instances_of_iterables,_in_calls)with instances of iterables, in calls | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_with_instances_of_iterables,_in_arrays)with instances of iterables, in arrays | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-spread_syntax_for_iterable_objects_spreading_non-iterables_is_a_runtime_error)spreading non-iterables is a runtime error | Yes | Yes | ? | ? | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | Yes | ? | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | No[[12]](#typescript-not-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions)[object literal extensions](http://www.ecma-international.org/ecma-262/6.0/#sec-object-initialiser) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer#New_notations_in_ECMAScript_2015 "MDN documentation")  | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 3/6 | 6/6 | 0/6 | 5/6 | 6/6 | 5/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 4/6 | 4/6 | 6/6 | 6/6 | 6/6 | 0/6 | 2/6 | 2/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | | [§](#test-object_literal_extensions_computed_properties)computed properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions_shorthand_properties)shorthand properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions_shorthand_methods)shorthand methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | Yes[[13]](#ff-shorthand-methods-note) | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions_string-keyed_shorthand_methods)string-keyed shorthand methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions_computed_shorthand_methods)computed shorthand methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-object_literal_extensions_computed_accessors)computed accessors | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops)[for..of loops](http://www.ecma-international.org/ecma-262/6.0/#sec-for-in-and-for-of-statements) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of "MDN documentation")  | 4/9 | 9/9 | 9/9 | 9/9 | 9/9 | 6/9 | 6/9 | 6/9 | 6/9 | 6/9 | 6/9 | 6/9 | 6/9 | 2/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 0/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 7/9 | 7/9 | 0/9 | 7/9 | 9/9 | 8/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 0/9 | 9/9 | 9/9 | 9/9 | 0/9 | 4/9 | 4/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | | [§](#test-for..of_loops_with_arrays)with arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_sparse_arrays)with sparse arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_strings)with strings | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_astral_plane_strings)with astral plane strings | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_generator_instances)with generator instances | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_generic_iterables)with generic iterables | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_with_instances_of_generic_iterables)with instances of generic iterables | Yes[[11]](#compiler-iterable-note) | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_iterator_closing,_break)iterator closing, break | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-for..of_loops_iterator_closing,_throw)iterator closing, throw | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-octal_and_binary_literals)[octal and binary literals](http://www.ecma-international.org/ecma-262/6.0/#sec-literals-numeric-literals) | 2/4 | 2/4 | 4/4 | 4/4 | 4/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 2/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 2/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 2/4 | 2/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | | [§](#test-octal_and_binary_literals_octal_literals)octal literals | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-octal_and_binary_literals_binary_literals)binary literals | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-octal_and_binary_literals_octal_supported_by_Number())octal supported by Number() | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-octal_and_binary_literals_binary_supported_by_Number())binary supported by Number() | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals)[template literals](http://www.ecma-international.org/ecma-262/6.0/#sec-template-literals) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals "MDN documentation")  | 5/8 | 6/8 | 6/8 | 6/8 | 6/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 6/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 5/8 | 0/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 6/8 | 6/8 | 0/8 | 6/8 | 7/8 | 7/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 7/8 | 7/8 | 7/8 | 0/8 | 5/8 | 5/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 5/8 | 6/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 7/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 5/8 | | [§](#test-template_literals_basic_functionality)basic functionality | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals_toString_conversion)toString conversion | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-template_literals_tagged_template_literals)tagged template literals | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals_passed_array_is_frozen)passed array is frozen | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-template_literals_line_break_normalisation)line break normalisation | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals_TemplateStrings_call_site_caching)TemplateStrings call site caching | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals_TemplateStrings_permanent_caching)TemplateStrings permanent caching | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No[[16]](#safari-templ-cahing-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-template_literals_arbitrary_escape_sequences_in_tagged_template_literals)arbitrary escape sequences in tagged template literals | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | | [§](#test-RegExp_y_and_u_flags)[RegExp "y" and "u" flags](http://www.ecma-international.org/ecma-262/6.0/#sec-get-regexp.prototype.sticky) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Parameters "MDN documentation")  | 0/6 | 4/6 | 4/6 | 4/6 | 6/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 2/6 | 2/6 | 0/6 | 2/6 | 2/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | | [§](#test-RegExp_y_and_u_flags_y_flag)"y" flag | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_y_and_u_flags_y_flag,_lastIndex)"y" flag, lastIndex | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_y_and_u_flags_u_flag)"u" flag | ? | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_y_and_u_flags_u_flag,_non-BMP_Unicode_characters)"u" flag, non-BMP Unicode characters | ? | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_y_and_u_flags_u_flag,_Unicode_code_point_escapes)"u" flag, Unicode code point escapes | ? | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_y_and_u_flags_u_flag,_case_folding)"u" flag, case folding | ? | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations)[destructuring, declarations](http://www.ecma-international.org/ecma-262/6.0/#sec-destructuring-assignment) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment "MDN documentation")  | 14/22 | 20/22 | 21/22 | 21/22 | 21/22 | 20/22 | 20/22 | 20/22 | 20/22 | 20/22 | 20/22 | 20/22 | 20/22 | 12/22 | 21/22 | 21/22 | 21/22 | 21/22 | 21/22 | 21/22 | 21/22 | 0/22 | 0/22 | 0/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 0/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 11/22 | 12/22 | 0/22 | 12/22 | 21/22 | 19/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 0/22 | 0/22 | 22/22 | 22/22 | 22/22 | 0/22 | 0/22 | 0/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 21/22 | 20/22 | 22/22 | 22/22 | 22/22 | 22/22 | 0/22 | 0/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 22/22 | 21/22 | | [§](#test-destructuring,_declarations_with_arrays)with arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_sparse_arrays)with sparse arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_strings)with strings | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_astral_plane_strings)with astral plane strings | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_generator_instances)with generator instances | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_generic_iterables)with generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_instances_of_generic_iterables)with instances of generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_iterator_closing)iterator closing | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_trailing_commas_in_iterable_patterns)trailing commas in iterable patterns | Yes | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_with_objects)with objects | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_object_destructuring_with_primitives)object destructuring with primitives | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_trailing_commas_in_object_patterns)trailing commas in object patterns | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_throws_on_null_and_undefined)throws on null and undefined | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_computed_properties)computed properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_multiples_in_a_single_var_statement)multiples in a single var statement | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_nested)nested | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_in_for-in_loop_heads)in for-in loop heads | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_in_for-of_loop_heads)in for-of loop heads | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_in_catch_heads)in catch heads | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[17]](#hermes-catch-destructuring-note) | No[[17]](#hermes-catch-destructuring-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_rest)rest | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_defaults)defaults | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_declarations_defaults,_let_temporal_dead_zone)defaults, let temporal dead zone | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-destructuring,_assignment)[destructuring, assignment](http://www.ecma-international.org/ecma-262/6.0/#sec-destructuring-assignment) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment "MDN documentation")  | 17/24 | 23/24 | 24/24 | 24/24 | 24/24 | 22/24 | 22/24 | 22/24 | 22/24 | 22/24 | 22/24 | 22/24 | 22/24 | 11/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 14/24 | 15/24 | 0/24 | 14/24 | 24/24 | 21/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | | [§](#test-destructuring,_assignment_with_arrays)with arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_sparse_arrays)with sparse arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_strings)with strings | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_astral_plane_strings)with astral plane strings | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_generator_instances)with generator instances | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_generic_iterables)with generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_instances_of_generic_iterables)with instances of generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_iterable_destructuring_expression)iterable destructuring expression | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_chained_iterable_destructuring)chained iterable destructuring | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_trailing_commas_in_iterable_patterns)trailing commas in iterable patterns | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_with_objects)with objects | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_object_destructuring_with_primitives)object destructuring with primitives | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_trailing_commas_in_object_patterns)trailing commas in object patterns | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_object_destructuring_expression)object destructuring expression | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_parenthesised_left-hand-side_is_a_syntax_error)parenthesised left-hand-side is a syntax error | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_chained_object_destructuring)chained object destructuring | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_throws_on_null_and_undefined)throws on null and undefined | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_computed_properties)computed properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_nested)nested | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_rest)rest | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_nested_rest)nested rest | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_empty_patterns)empty patterns | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_assignment_defaults)defaults | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters)[destructuring, parameters](http://www.ecma-international.org/ecma-262/6.0/#sec-destructuring-assignment) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment "MDN documentation")  | 16/26 | 22/26 | 23/26 | 23/26 | 23/26 | 22/26 | 22/26 | 22/26 | 22/26 | 22/26 | 22/26 | 22/26 | 22/26 | 13/26 | 23/26 | 23/26 | 23/26 | 23/26 | 23/26 | 23/26 | 23/26 | 0/26 | 0/26 | 0/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 0/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 25/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 13/26 | 16/26 | 0/26 | 13/26 | 24/26 | 19/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 0/26 | 0/26 | 26/26 | 26/26 | 26/26 | 0/26 | 0/26 | 0/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 25/26 | 25/26 | 26/26 | 26/26 | 26/26 | 26/26 | 0/26 | 0/26 | 25/26 | 25/26 | 25/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | 26/26 | | [§](#test-destructuring,_parameters_with_arrays)with arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_sparse_arrays)with sparse arrays | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_strings)with strings | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_astral_plane_strings)with astral plane strings | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_generator_instances)with generator instances | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_generic_iterables)with generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_instances_of_generic_iterables)with instances of generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_trailing_commas_in_iterable_patterns)trailing commas in iterable patterns | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_with_objects)with objects | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_object_destructuring_with_primitives)object destructuring with primitives | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_trailing_commas_in_object_patterns)trailing commas in object patterns | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_throws_on_null_and_undefined)throws on null and undefined | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_computed_properties)computed properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_nested)nested | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_arguments'_interaction)'arguments' interaction | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_new_Function()_support)new Function() support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_in_parameters,_function_'length'_property)in parameters, function 'length' property | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_rest)rest | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_empty_patterns)empty patterns | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_defaults)defaults | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_defaults,_separate_scope)defaults, separate scope | ? | ? | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_defaults,_new_Function()_support)defaults, new Function() support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | No[[0]](#ejs-no-function-ctor-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_aliased_defaults,_arrow_function)aliased defaults, arrow function | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_shorthand_defaults,_arrow_function)shorthand defaults, arrow function | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-destructuring,_parameters_duplicate_identifier)duplicate identifier | Yes | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Unicode_code_point_escapes)[Unicode code point escapes](http://www.ecma-international.org/ecma-262/6.0/#sec-literals-string-literals) | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 0/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 3/4 | 3/4 | 3/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 1/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | | [§](#test-Unicode_code_point_escapes_in_strings)in strings | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Unicode_code_point_escapes_in_identifiers)in identifiers | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Unicode_code_point_escapes_in_property_key_definitions)in property key definitions | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Unicode_code_point_escapes_in_property_key_accesses)in property key accesses | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-new.target)[new.target](http://www.ecma-international.org/ecma-262/6.0/#sec-built-in-function-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new.target "MDN documentation")  | 0/2 | 0/2 | 0/2 | 1/2 | 1/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 1/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | | [§](#test-new.target_in_constructors)in constructors | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-new.target_assignment_is_an_early_error)assignment is an early error | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Bindings | | [§](#test-const)[const](http://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const "MDN documentation")  | 12/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 0/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 16/18 | 0/18 | 2/18 | 14/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 2/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 2/18 | 2/18 | 1/18 | 10/18 | 18/18 | 12/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 4/18 | 4/18 | 18/18 | 18/18 | 18/18 | 12/18 | 16/18 | 16/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 8/18 | 6/18 | 18/18 | 18/18 | 18/18 | 18/18 | 1/18 | 1/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 18/18 | 14/18 | | [§](#test-const_basic_support)basic support | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_is_block-scoped)is block-scoped | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_scope_shadow_resolution)scope shadow resolution | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_cannot_be_in_statements)cannot be in statements | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_redefining_a_const_is_an_error)redefining a const is an error | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-const_for_loop_statement_scope)for loop statement scope | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_for-in_loop_iteration_scope)for-in loop iteration scope | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_for-of_loop_iteration_scope)for-of loop iteration scope | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_temporal_dead_zone)temporal dead zone | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-const_basic_support_(strict_mode))basic support (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_is_block-scoped_(strict_mode))is block-scoped (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_scope_shadow_resolution_(strict_mode))scope shadow resolution (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag | Flag | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_cannot_be_in_statements_(strict_mode))cannot be in statements (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_redefining_a_const_(strict_mode))redefining a const (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-const_for_loop_statement_scope_(strict_mode))for loop statement scope (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_for-in_loop_iteration_scope_(strict_mode))for-in loop iteration scope (strict mode) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_for-of_loop_iteration_scope_(strict_mode))for-of loop iteration scope (strict mode) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-const_temporal_dead_zone_(strict_mode))temporal dead zone (strict mode) | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-let)[let](http://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let "MDN documentation")  | 10/16 | 12/16 | 12/16 | 12/16 | 12/16 | 14/16 | 14/16 | 14/16 | 14/16 | 14/16 | 14/16 | 14/16 | 14/16 | 0/16 | 12/16 | 12/16 | 12/16 | 12/16 | 12/16 | 12/16 | 12/16 | 0/16 | 0/16 | 14/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 0/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 10/16 | 10/16 | 0/16 | 10/16 | 14/16 | 0/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 0/16 | 0/16 | 16/16 | 16/16 | 16/16 | 10/16 | 12/16 | 12/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 10/16 | 8/16 | 16/16 | 16/16 | 16/16 | 16/16 | 0/16 | 0/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 16/16 | 14/16 | | [§](#test-let_basic_support)basic support | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_is_block-scoped)is block-scoped | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_scope_shadow_resolution)scope shadow resolution | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_cannot_be_in_statements)cannot be in statements | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_for_loop_statement_scope)for loop statement scope | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_temporal_dead_zone)temporal dead zone | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-let_for/for-in_loop_iteration_scope)for/for-in loop iteration scope | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_for-in_loop_binding_shadowing_parameter)for-in loop binding shadowing parameter | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_basic_support_(strict_mode))basic support (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_is_block-scoped_(strict_mode))is block-scoped (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_scope_shadow_resolution_(strict_mode))scope shadow resolution (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag | Flag | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_cannot_be_in_statements_(strict_mode))cannot be in statements (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_for_loop_statement_scope_(strict_mode))for loop statement scope (strict mode) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_temporal_dead_zone_(strict_mode))temporal dead zone (strict mode) | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-let_for/for-in_loop_iteration_scope_(strict_mode))for/for-in loop iteration scope (strict mode) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-let_for-in_loop_binding_shadowing_parameter_(strict_mode))for-in loop binding shadowing parameter (strict mode) | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-block-level_function_declaration)[block-level function declaration](http://www.ecma-international.org/ecma-262/6.0/#sec-functiondeclarationinstantiation)[[19]](#block-level-function-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Functions | | [§](#test-arrow_functions)[arrow functions](http://www.ecma-international.org/ecma-262/6.0/#sec-arrow-function-definitions) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions "MDN documentation")  | 8/13 | 11/13 | 9/13 | 9/13 | 9/13 | 10/13 | 10/13 | 10/13 | 10/13 | 10/13 | 10/13 | 10/13 | 10/13 | 8/13 | 9/13 | 9/13 | 9/13 | 9/13 | 9/13 | 9/13 | 9/13 | 0/13 | 0/13 | 0/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 0/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 10/13 | 10/13 | 0/13 | 7/13 | 12/13 | 0/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 0/13 | 0/13 | 13/13 | 13/13 | 13/13 | 0/13 | 6/13 | 6/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 10/13 | 10/13 | 13/13 | 13/13 | 13/13 | 13/13 | 0/13 | 0/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 13/13 | 12/13 | | [§](#test-arrow_functions_0_parameters)0 parameters | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_1_parameter,_no_brackets)1 parameter, no brackets | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_multiple_parameters)multiple parameters | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_lexical_this_binding)lexical "this" binding | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_this_unchanged_by_call_or_apply)"this" unchanged by call or apply | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_can't_be_bound,_can_be_curried)can't be bound, can be curried | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_lexical_arguments_binding)lexical "arguments" binding | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_no_line_break_between_params_and_code_=_/code)no line break between params and `=>` | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_correct_precedence)correct precedence | ? | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_no_prototype_property)no "prototype" property | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-arrow_functions_lexical_super_binding_in_constructors)lexical "super" binding in constructors | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_lexical_super_binding_in_methods)lexical "super" binding in methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-arrow_functions_lexical_new.target_binding)lexical "new.target" binding | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class)[class](http://www.ecma-international.org/ecma-262/6.0/#sec-class-definitions) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes "MDN documentation")  | 17/24 | 17/24 | 19/24 | 19/24 | 19/24 | 15/24 | 15/24 | 15/24 | 15/24 | 15/24 | 15/24 | 15/24 | 15/24 | 16/24 | 19/24 | 19/24 | 19/24 | 19/24 | 19/24 | 19/24 | 19/24 | 0/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 0/24 | 22/24 | 24/24 | 18/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 0/24 | 0/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 24/24 | 22/24 | | [§](#test-class_class_statement)class statement | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_is_block-scoped)is block-scoped | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_class_expression)class expression | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_anonymous_class)anonymous class | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_constructor)constructor | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_prototype_methods)prototype methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_string-keyed_methods)string-keyed methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_computed_prototype_methods)computed prototype methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_optional_semicolons)optional semicolons | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_static_methods)static methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_computed_static_methods)computed static methods | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_accessor_properties)accessor properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_computed_accessor_properties)computed accessor properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_static_accessor_properties)static accessor properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_computed_static_accessor_properties)computed static accessor properties | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_class_name_is_lexically_scoped)class name is lexically scoped | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_computed_names,_temporal_dead_zone)computed names, temporal dead zone | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-class_methods_aren't_enumerable)methods aren't enumerable | ? | ? | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_implicit_strict_mode)implicit strict mode | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-class_constructor_requires_new)constructor requires new | ? | ? | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_extends)extends | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_extends_expressions)extends expressions | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[22]](#compiled-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | No[[23]](#typescript-extends-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_extends_null)extends null | Yes | Yes | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-class_new.target)new.target | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super)[super](http://www.ecma-international.org/ecma-262/6.0/#sec-super-keyword) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/super "MDN documentation")  | 7/8 | 7/8 | 4/8 | 4/8 | 4/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 0/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 0/8 | 6/8 | 8/8 | 7/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | | [§](#test-super_statement_in_constructors)statement in constructors | Yes | Yes | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_expression_in_constructors)expression in constructors | Yes | Yes | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_in_methods,_property_access)in methods, property access | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_in_methods,_method_calls)in methods, method calls | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_method_calls_use_correct_this_binding)method calls use correct "this" binding | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_constructor_calls_use_correct_new.target_binding)constructor calls use correct "new.target" binding | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_is_statically_bound)is statically bound | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-super_super()_invokes_the_correct_constructor)super() invokes the correct constructor | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators)[generators](http://www.ecma-international.org/ecma-262/6.0/#sec-generator-function-definitions) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function* "MDN documentation")  | 0/27 | 24/27 | 24/27 | 24/27 | 24/27 | 19/27 | 19/27 | 19/27 | 19/27 | 19/27 | 19/27 | 19/27 | 20/27 | 0/27 | 22/27 | 22/27 | 22/27 | 22/27 | 22/27 | 22/27 | 22/27 | 0/27 | 0/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 16/27 | 19/27 | 0/27 | 16/27 | 27/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 0/27 | 0/27 | 27/27 | 27/27 | 27/27 | 0/27 | 0/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 24/27 | 24/27 | 27/27 | 27/27 | 27/27 | 27/27 | 0/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | | [§](#test-generators_basic_functionality)basic functionality | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_generator_function_expressions)generator function expressions | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_correct_this_binding)correct "this" binding | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_can't_use_this_with_new)can't use "this" with new | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_sending)sending | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_%GeneratorPrototype%)%GeneratorPrototype% | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_%GeneratorPrototype%_prototype_chain)%GeneratorPrototype% prototype chain | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_%GeneratorPrototype%.constructor)%GeneratorPrototype%.constructor | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_%GeneratorPrototype%.throw)%GeneratorPrototype%.throw | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_%GeneratorPrototype%.return)%GeneratorPrototype%.return | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_operator_precedence)yield operator precedence | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_arrays)yield \*, arrays | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_sparse_arrays)yield \*, sparse arrays | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_strings)yield \*, strings | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_astral_plane_strings)yield \*, astral plane strings | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_generator_instances)yield \*, generator instances | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_generic_iterables)yield \*, generic iterables | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_instances_of_iterables)yield \*, instances of iterables | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*_on_non-iterables_is_a_runtime_error)yield \* on non-iterables is a runtime error | ? | Yes | No | No | No | ? | ? | ? | ? | ? | ? | ? | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_iterator_closing)yield \*, iterator closing | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_yield_*,_iterator_closing_via_throw())yield \*, iterator closing via throw() | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_shorthand_generator_methods)shorthand generator methods | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_string-keyed_shorthand_generator_methods)string-keyed shorthand generator methods | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_computed_shorthand_generators)computed shorthand generators | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_shorthand_generator_methods,_classes)shorthand generator methods, classes | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_computed_shorthand_generators,_classes)computed shorthand generators, classes | ? | Yes | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-generators_shorthand_generators_can't_be_constructors)shorthand generators can't be constructors | ? | ? | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | Yes[[24]](#babel-regenerator-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | Yes[[9]](#typescript-downlevel-iteration-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Built-ins | | [§](#test-typed_arrays)[typed arrays](http://www.ecma-international.org/ecma-262/6.0/#sec-typedarray-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray "MDN documentation")  | 0/46 | 0/46 | 45/46 | 45/46 | 46/46 | 0/46 | 0/46 | 0/46 | 0/46 | 0/46 | 0/46 | 0/46 | 0/46 | 0/46 | 45/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 0/46 | 8/46 | 18/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 18/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 20/46 | 40/46 | 18/46 | 37/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 19/46 | 19/46 | 46/46 | 46/46 | 46/46 | 19/46 | 20/46 | 20/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 43/46 | 43/46 | 46/46 | 46/46 | 46/46 | 46/46 | 19/46 | 19/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 46/46 | 43/46 | | [§](#test-typed_arrays_Int8Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Int8Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Uint8Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Uint8Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Uint8ClampedArray_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Uint8ClampedArray [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes[[25]](#ie-clampedarray-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Int16Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int16Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Int16Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int16Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Uint16Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Uint16Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Int32Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Int32Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int32Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Uint32Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Uint32Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Float32Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Float32Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_Float64Array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float64Array_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Float64Array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float64Array "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Int8)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Int8) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Uint8)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Uint8) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Int16)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Int16) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Uint16)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Uint16) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Int32)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Int32) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Uint32)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Uint32) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Float32)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Float32) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_DataView_(Float64)_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)DataView (Float64) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_ArrayBuffer[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)ArrayBuffer[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-typed_arrays_constructors_require_new)constructors require new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_constructors_accept_generic_iterables)constructors accept generic iterables | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-typed_arrays_correct_prototype_chains)correct prototype chains | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.from_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.from [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.of_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/of_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.of [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/of "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.subarray_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/subarray_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.subarray [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/subarray "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes[[26]](#ie-subarray-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.join_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/join_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.join [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/join "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.indexOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/indexOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.indexOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/indexOf "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.lastIndexOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/lastIndexOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.lastIndexOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/lastIndexOf "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.slice_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/slice_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.slice [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/slice "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.every_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/every_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.every [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/every "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.filter_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/filter_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.filter [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/filter "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.forEach_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/forEach_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.forEach [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/forEach "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.map_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/map_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.map [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/map "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.reduce_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reduce_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.reduce [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reduce "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.reduceRight_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reduceRight_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.reduceRight [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reduceRight "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.reverse_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reverse_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.reverse [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/reverse "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.some_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/some_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.some [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/some "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.sort_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/sort_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.sort [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/sort "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.copyWithin_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/copyWithin_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.copyWithin [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/copyWithin "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.find_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/find_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.find [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/find "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.findIndex_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/findIndex_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.findIndex [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/findIndex "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.fill_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/fill_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.fill [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/fill "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/keys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/keys "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.values_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/values_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.values [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/values "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype.entries_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/entries_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype.entries [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/entries "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%.prototype[Symbol.iterator]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/@@iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%.prototype[Symbol.iterator] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/@@iterator "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-typed_arrays_%TypedArray%[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)%TypedArray%[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Map)[Map](http://www.ecma-international.org/ecma-262/6.0/#sec-map-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map "MDN documentation")  | 0/19 | 14/19 | 19/19 | 19/19 | 19/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 15/19 | 0/19 | 8/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 18/19 | 18/19 | 0/19 | 17/19 | 19/19 | 18/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 0/19 | 19/19 | 19/19 | 19/19 | 0/19 | 16/19 | 16/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 17/19 | 18/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 18/19 | | [§](#test-Map_basic_functionality)basic functionality | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_constructor_arguments)constructor arguments | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_constructor_requires_new)constructor requires new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_constructor_accepts_null)constructor accepts null | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_constructor_invokes_set)constructor invokes set | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.set_returns_this)Map.prototype.set returns this | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_-0_key_converts_to_+0)-0 key converts to +0 | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.size_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/size_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.size [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/size "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.delete_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.delete [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/delete "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.clear_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.clear [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.forEach_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.forEach [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/keys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/keys "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.values_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/values_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.values [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/values "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype.entries_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/entries_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype.entries [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/entries "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype[Symbol.iterator]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map.prototype[Symbol.iterator] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@iterator "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map.prototype_isn't_an_instance)Map.prototype isn't an instance | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map_iterator_prototype_chain)Map iterator prototype chain | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Map_Map[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Map[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Set)[Set](http://www.ecma-international.org/ecma-262/6.0/#sec-set-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set "MDN documentation")  | 0/19 | 14/19 | 19/19 | 19/19 | 19/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 15/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 15/19 | 0/19 | 8/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 18/19 | 18/19 | 0/19 | 18/19 | 19/19 | 18/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 0/19 | 19/19 | 19/19 | 19/19 | 0/19 | 16/19 | 16/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 17/19 | 18/19 | 19/19 | 19/19 | 19/19 | 19/19 | 0/19 | 0/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 19/19 | 18/19 | | [§](#test-Set_basic_functionality)basic functionality | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_constructor_arguments)constructor arguments | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_constructor_requires_new)constructor requires new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_constructor_accepts_null)constructor accepts null | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_constructor_invokes_add)constructor invokes add | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.add_returns_this)Set.prototype.add returns this | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_-0_key_converts_to_+0)-0 key converts to +0 | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.size_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/size_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.size [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/size "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.delete_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/delete_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.delete [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/delete "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.clear_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/clear_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.clear [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/clear "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.forEach_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/forEach_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.forEach [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/forEach "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/keys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/keys "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.values_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/values_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.values [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/values "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype.entries_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/entries_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype.entries [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/entries "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype[Symbol.iterator]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set.prototype[Symbol.iterator] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@iterator "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set.prototype_isn't_an_instance)Set.prototype isn't an instance | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set_iterator_prototype_chain)Set iterator prototype chain | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Set_Set[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Set[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-WeakMap)[WeakMap](http://www.ecma-international.org/ecma-262/6.0/#sec-weakmap-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap "MDN documentation")  | 0/12 | 6/12 | 12/12 | 12/12 | 12/12 | 9/12 | 9/12 | 9/12 | 9/12 | 9/12 | 9/12 | 9/12 | 9/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 0/12 | 6/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 9/12 | 11/12 | 11/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 0/12 | 12/12 | 12/12 | 12/12 | 0/12 | 10/12 | 10/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | | [§](#test-WeakMap_basic_functionality)basic functionality | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_constructor_arguments)constructor arguments | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_constructor_requires_new)constructor requires new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_constructor_accepts_null)constructor accepts null | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_constructor_invokes_set)constructor invokes set | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_frozen_objects_as_keys)frozen objects as keys | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_WeakMap.prototype.set_returns_this_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/set#Return_value_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)WeakMap.prototype.set returns this [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/set#Return_value "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_WeakMap.prototype.delete_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/delete_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)WeakMap.prototype.delete [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/delete "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_no_WeakMap.prototype.clear_method_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/clear_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)no WeakMap.prototype.clear method [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/clear "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_.has,_.get_and_.delete_methods_accept_primitives).has, .get and .delete methods accept primitives | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakMap_WeakMap.prototype_isn't_an_instance)WeakMap.prototype isn't an instance | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet)[WeakSet](http://www.ecma-international.org/ecma-262/6.0/#sec-weakset-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet "MDN documentation")  | 0/11 | 5/11 | 11/11 | 11/11 | 11/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 9/11 | 10/11 | 10/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 0/11 | 9/11 | 9/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | | [§](#test-WeakSet_basic_functionality)basic functionality | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_constructor_arguments)constructor arguments | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_constructor_requires_new)constructor requires new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_constructor_accepts_null)constructor accepts null | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_constructor_invokes_add)constructor invokes add | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_iterator_closing)iterator closing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_WeakSet.prototype.add_returns_this)WeakSet.prototype.add returns this | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_WeakSet.prototype.delete)WeakSet.prototype.delete | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_no_WeakSet.prototype.clear_method)no WeakSet.prototype.clear method | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_.has_and_.delete_methods_accept_primitives).has and .delete methods accept primitives | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-WeakSet_WeakSet.prototype_isn't_an_instance)WeakSet.prototype isn't an instance | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy)[Proxy](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy "MDN documentation") [[27]](#proxy-enumerate-note) | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 0/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 0/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 0/34 | 23/34 | 0/34 | 27/34 | 34/34 | 0/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 17/34 | 17/34 | 34/34 | 34/34 | 34/34 | 0/34 | 0/34 | 0/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 28/34 | 28/34 | 34/34 | 34/34 | 34/34 | 34/34 | 0/34 | 0/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 34/34 | 28/34 | | [§](#test-Proxy_constructor_requires_new)constructor requires new | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_no_prototype_property)no "prototype" property | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_get_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/get_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"get" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/get "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_get_handler,_instances_of_proxies)"get" handler, instances of proxies | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_get_handler_invariants)"get" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_set_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"set" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_set_handler,_instances_of_proxies)"set" handler, instances of proxies | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_set_handler_invariants)"set" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_has_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/has_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"has" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/has "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_has_handler,_instances_of_proxies)"has" handler, instances of proxies | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_has_handler_invariants)"has" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_deleteProperty_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/deleteProperty_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"deleteProperty" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/deleteProperty "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_deleteProperty_handler_invariant)"deleteProperty" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_getOwnPropertyDescriptor_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getOwnPropertyDescriptor_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"getOwnPropertyDescriptor" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getOwnPropertyDescriptor "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_getOwnPropertyDescriptor_handler_invariants)"getOwnPropertyDescriptor" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_defineProperty_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/defineProperty_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"defineProperty" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/defineProperty "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_defineProperty_handler_invariants)"defineProperty" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_getPrototypeOf_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"getPrototypeOf" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getPrototypeOf "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_getPrototypeOf_handler_invariant)"getPrototypeOf" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_setPrototypeOf_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/setPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"setPrototypeOf" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/setPrototypeOf "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_setPrototypeOf_handler_invariant)"setPrototypeOf" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_isExtensible_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/isExtensible_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"isExtensible" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/isExtensible "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_isExtensible_handler_invariant)"isExtensible" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_preventExtensions_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/preventExtensions_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"preventExtensions" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/preventExtensions "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_preventExtensions_handler_invariant)"preventExtensions" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_ownKeys_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/ownKeys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"ownKeys" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/ownKeys "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_ownKeys_handler_invariant)"ownKeys" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_apply_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"apply" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_apply_handler_invariant)"apply" handler invariant | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_construct_handler_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/construct_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)"construct" handler [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/construct "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_construct_handler_invariants)"construct" handler invariants | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy_Proxy.revocable_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/revocable_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Proxy.revocable [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/revocable "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_Array.isArray_support)Array.isArray support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy_JSON.stringify_support)JSON.stringify support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect)[Reflect](http://www.ecma-international.org/ecma-262/6.0/#sec-reflection) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect "MDN documentation") [[28]](#reflect-enumerate-note) | 0/20 | 0/20 | 15/20 | 15/20 | 15/20 | 13/20 | 13/20 | 13/20 | 13/20 | 13/20 | 13/20 | 13/20 | 13/20 | 0/20 | 15/20 | 15/20 | 15/20 | 15/20 | 15/20 | 15/20 | 15/20 | 14/20 | 0/20 | 0/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 0/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 0/20 | 17/20 | 0/20 | 14/20 | 16/20 | 0/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 14/20 | 14/20 | 20/20 | 20/20 | 20/20 | 0/20 | 0/20 | 0/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 18/20 | 18/20 | 20/20 | 20/20 | 20/20 | 20/20 | 0/20 | 0/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 20/20 | 18/20 | | [§](#test-Reflect_Reflect.get_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.get [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/get "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.set_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.set [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/set "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.has_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.has [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/has "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.deleteProperty_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.deleteProperty [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/deleteProperty "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.getOwnPropertyDescriptor_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.getOwnPropertyDescriptor [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.defineProperty_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.defineProperty [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.getPrototypeOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.getPrototypeOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getPrototypeOf "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.setPrototypeOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.setPrototypeOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/setPrototypeOf "MDN documentation")  | ? | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.isExtensible_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.isExtensible [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/isExtensible "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.preventExtensions_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.preventExtensions [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/preventExtensions "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.ownKeys,_string_keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.ownKeys, string keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.ownKeys,_symbol_keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.ownKeys, symbol keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | No | No | No | No | No | No | No | No | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.apply_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.apply [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Reflect.construct [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct_sets_new.target_meta-property)Reflect.construct sets new.target meta-property | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct_creates_instances_from_third_argument)Reflect.construct creates instances from third argument | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct,_Array_subclassing)Reflect.construct, Array subclassing | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct,_RegExp_subclassing)Reflect.construct, RegExp subclassing | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Reflect_Reflect.construct,_Function_subclassing)Reflect.construct, Function subclassing | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Reflect_Reflect.construct,_Promise_subclassing)Reflect.construct, Promise subclassing | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise)[Promise](http://www.ecma-international.org/ecma-262/6.0/#sec-promise-objects) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "MDN documentation")  | 0/8 | 4/8 | 8/8 | 8/8 | 8/8 | 6/8 | 6/8 | 6/8 | 6/8 | 6/8 | 6/8 | 6/8 | 6/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 7/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 4/8 | 8/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 0/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 4/8 | 8/8 | 8/8 | 8/8 | 8/8 | 0/8 | 5/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 4/8 | | [§](#test-Promise_basic_functionality_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)basic functionality [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_constructor_requires_new)constructor requires new | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_Promise.prototype_isn't_an_instance)Promise.prototype isn't an instance | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise_Promise.all_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Promise.all [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_Promise.all,_generic_iterables)Promise.all, generic iterables | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise_Promise.race_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/race_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Promise.race [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/race "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_Promise.race,_generic_iterables)Promise.race, generic iterables | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise_Promise[Symbol.species])Promise[Symbol.species] | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Symbol)[Symbol](http://www.ecma-international.org/ecma-262/6.0/#sec-symbol-constructor) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol "MDN documentation")  | 0/12 | 4/12 | 9/12 | 9/12 | 9/12 | 3/12 | 3/12 | 3/12 | 3/12 | 3/12 | 3/12 | 3/12 | 3/12 | 0/12 | 8/12 | 8/12 | 8/12 | 8/12 | 8/12 | 8/12 | 8/12 | 2/12 | 0/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 11/12 | 12/12 | 0/12 | 4/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 11/12 | 11/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 0/12 | 0/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | 12/12 | | [§](#test-Symbol_basic_functionality)basic functionality | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_typeof_support)typeof support | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_symbol_keys_are_hidden_to_pre-ES6_code)symbol keys are hidden to pre-ES6 code | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_Object.defineProperty_support)Object.defineProperty support | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_symbols_inherit_from_Symbol.prototype)symbols inherit from Symbol.prototype | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_cannot_coerce_to_string_or_number)cannot coerce to string or number | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_can_convert_with_String())can convert with String() | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_new_Symbol()_throws)new Symbol() throws | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_Object(symbol))Object(symbol) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_JSON.stringify_ignores_symbol_primitives)JSON.stringify ignores symbol primitives | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_JSON.stringify_ignores_symbol_objects)JSON.stringify ignores symbol objects | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Symbol_global_symbol_registry)global symbol registry | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols)[well-known symbols](http://www.ecma-international.org/ecma-262/6.0/#sec-well-known-symbols)[[29]](#symbol-iterator-functionality-note) | 0/27 | 1/27 | 15/27 | 15/27 | 22/27 | 1/27 | 1/27 | 1/27 | 1/27 | 1/27 | 1/27 | 1/27 | 1/27 | 0/27 | 15/27 | 22/27 | 22/27 | 22/27 | 22/27 | 22/27 | 22/27 | 0/27 | 0/27 | 0/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 0/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 10/27 | 13/27 | 0/27 | 23/27 | 25/27 | 22/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 5/27 | 5/27 | 26/27 | 26/27 | 27/27 | 0/27 | 1/27 | 1/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 27/27 | 27/27 | 16/27 | 16/27 | 26/27 | 26/27 | 26/27 | 26/27 | 0/27 | 0/27 | 26/27 | 26/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 27/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 26/27 | 16/27 | | [§](#test-well-known_symbols_Symbol.hasInstance_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.hasInstance [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance "MDN documentation")  | ? | ? | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | Flag[[18]](#babel-optional-flag-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.isConcatSpreadable,_non-spreadable_array_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.isConcatSpreadable, non-spreadable array [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable "MDN documentation")  | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.isConcatSpreadable,_spreadable_object_with_poisoned_getter_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.isConcatSpreadable, spreadable object with poisoned getter [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | Yes | Yes | No | ? | ? | ? | No | No | No | No | No | ? | ? | ? | ? | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | No | No | No | No | ? | ? | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No | No | No | Yes | | [§](#test-well-known_symbols_Symbol.iterator,_existence_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.iterator, existence [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.iterator,_arguments_object)Symbol.iterator, arguments object | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.species,_existence_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.species, existence [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Array.prototype.concat)Symbol.species, Array.prototype.concat | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Array.prototype.filter)Symbol.species, Array.prototype.filter | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Array.prototype.map)Symbol.species, Array.prototype.map | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Array.prototype.slice)Symbol.species, Array.prototype.slice | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Array.prototype.splice)Symbol.species, Array.prototype.splice | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_RegExp.prototype[Symbol.split])Symbol.species, RegExp.prototype[Symbol.split] | ? | ? | No | No | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.species,_Promise.prototype.then)Symbol.species, Promise.prototype.then | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.replace_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/replace_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.replace [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/replace "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.search_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/search_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.search [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/search "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.split_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.split [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.match_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/match_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.match [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/match "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.match,_RegExp_constructor)Symbol.match, RegExp constructor | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.match,_String.prototype.startsWith)Symbol.match, String.prototype.startsWith | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.match,_String.prototype.endsWith)Symbol.match, String.prototype.endsWith | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.match,_String.prototype.includes)Symbol.match, String.prototype.includes | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.toPrimitive_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.toPrimitive [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.toStringTag_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.toStringTag [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.toStringTag_affects_existing_built-ins)Symbol.toStringTag affects existing built-ins | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.toStringTag,_new_built-ins)Symbol.toStringTag, new built-ins | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-well-known_symbols_Symbol.toStringTag,_misc._built-ins)Symbol.toStringTag, misc. built-ins | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-well-known_symbols_Symbol.unscopables_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/unscopables_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Symbol.unscopables [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/unscopables "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | No[[30]](#ejs-no-with-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | Built-in extensions | | [§](#test-Object_static_methods)[Object static methods](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-object-constructor) | 0/4 | 3/4 | 3/4 | 3/4 | 3/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 2/4 | 0/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 2/4 | 1/4 | 1/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 1/4 | 2/4 | 2/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 1/4 | 1/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | | [§](#test-Object_static_methods_Object.assign_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.assign [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_Object.is_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.is [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_Object.getOwnPropertySymbols_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.getOwnPropertySymbols [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_Object.setPrototypeOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.setPrototypeOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf "MDN documentation")  | ? | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property)[function "name" property](http://www.ecma-international.org/ecma-262/6.0/#sec-setfunctionname) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name "MDN documentation")  | 0/17 | 0/17 | 8/17 | 8/17 | 8/17 | 0/17 | 0/17 | 0/17 | 0/17 | 0/17 | 0/17 | 0/17 | 0/17 | 0/17 | 3/17 | 3/17 | 3/17 | 3/17 | 3/17 | 3/17 | 3/17 | 0/17 | 3/17 | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 2/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 6/17 | 6/17 | 3/17 | 5/17 | 17/17 | 14/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 7/17 | 7/17 | 17/17 | 17/17 | 17/17 | 2/17 | 3/17 | 3/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 10/17 | 10/17 | 17/17 | 17/17 | 17/17 | 17/17 | 2/17 | 2/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 15/17 | | [§](#test-function_name_property_function_statements)function statements | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_function_expressions)function expressions | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_new_Function)new Function | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[0]](#ejs-no-function-ctor-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_bound_functions)bound functions | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_variables_(function))variables (function) | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_object_methods_(function))object methods (function) | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_accessor_properties)accessor properties | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_shorthand_methods)shorthand methods | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_shorthand_methods_(no_lexical_binding))shorthand methods (no lexical binding) | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_symbol-keyed_methods)symbol-keyed methods | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-function_name_property_class_statements)class statements | ? | ? | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_class_expressions)class expressions | ? | ? | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_variables_(class))variables (class) | ? | ? | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | No[[31]](#name-configurable-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_object_methods_(class))object methods (class) | ? | ? | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-function_name_property_class_prototype_methods)class prototype methods | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_class_static_methods)class static methods | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-function_name_property_isn't_writable,_is_configurable)isn't writable, is configurable | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String_static_methods)[String static methods](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-string-constructor) | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 1/2 | 1/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 1/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | | [§](#test-String_static_methods_String.raw_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/raw_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.raw [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/raw "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String_static_methods_String.fromCodePoint_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.fromCodePoint [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods)[String.prototype methods](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-string-prototype-object) | 0/10 | 8/10 | 9/10 | 9/10 | 9/10 | 7/10 | 7/10 | 7/10 | 7/10 | 7/10 | 7/10 | 7/10 | 7/10 | 0/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 9/10 | 7/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 9/10 | 9/10 | 0/10 | 9/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 7/10 | 7/10 | 9/10 | 9/10 | 9/10 | 0/10 | 2/10 | 2/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | | [§](#test-String.prototype_methods_String.prototype.codePointAt_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.codePointAt [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.normalize_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.normalize [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/normalize "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.repeat_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.repeat [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.startsWith_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.startsWith [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.startsWith_throws_on_RegExp)String.prototype.startsWith throws on RegExp | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.endsWith_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.endsWith [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.endsWith_throws_on_RegExp)String.prototype.endsWith throws on RegExp | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype.includes_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype.includes [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[0]](#string-contains-note) | No[[0]](#string-contains-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String.prototype[Symbol.iterator]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/@@iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)String.prototype[Symbol.iterator] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/@@iterator "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_methods_String_iterator_prototype_chain)String iterator prototype chain | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties)[RegExp.prototype properties](http://www.ecma-international.org/ecma-262/6.0/#sec-regexp.prototype) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/prototype "MDN documentation")  | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 1/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 4/6 | 4/6 | 0/6 | 6/6 | 6/6 | 5/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 1/6 | 1/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 5/6 | 5/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 5/6 | | [§](#test-RegExp.prototype_properties_RegExp.prototype.flags_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp.prototype.flags [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties_RegExp.prototype[Symbol.match]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@match_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp.prototype[Symbol.match] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@match "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties_RegExp.prototype[Symbol.replace]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@replace_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp.prototype[Symbol.replace] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@replace "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties_RegExp.prototype[Symbol.split]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@split_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp.prototype[Symbol.split] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@split "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties_RegExp.prototype[Symbol.search]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@search_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp.prototype[Symbol.search] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@search "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp.prototype_properties_RegExp[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)RegExp[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_static_methods)[Array static methods](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-array-constructor) | 0/11 | 10/11 | 11/11 | 11/11 | 11/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 0/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 9/11 | 7/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 6/11 | 11/11 | 8/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 10/11 | 10/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 10/11 | | [§](#test-Array_static_methods_Array.from,_array-like_objects_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from#Array_from_an_Array-like_object_(arguments)_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.from, array-like objects [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from#Array_from_an_Array-like_object_(arguments) "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from,_generator_instances)Array.from, generator instances | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from,_generic_iterables)Array.from, generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from,_instances_of_generic_iterables)Array.from, instances of generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from_map_function,_array-like_objects)Array.from map function, array-like objects | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from_map_function,_generator_instances)Array.from map function, generator instances | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | ?[[8]](#typescript-es6-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from_map_function,_generic_iterables)Array.from map function, generic iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from_map_function,_instances_of_iterables)Array.from map function, instances of iterables | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.from,_iterator_closing)Array.from, iterator closing | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array.of_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.of [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_static_methods_Array[Symbol.species]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@species_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array[Symbol.species] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@species "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array.prototype_methods)[Array.prototype methods](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-array-prototype-object) | 0/11 | 7/11 | 10/11 | 10/11 | 10/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 8/11 | 0/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 7/11 | 0/11 | 1/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 9/11 | 10/11 | 1/11 | 9/11 | 10/11 | 10/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 10/11 | 10/11 | 11/11 | 0/11 | 5/11 | 5/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 10/11 | 11/11 | 11/11 | 10/11 | 10/11 | 11/11 | 11/11 | 11/11 | 11/11 | 1/11 | 1/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 10/11 | | [§](#test-Array.prototype_methods_Array.prototype.copyWithin_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.copyWithin [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.find_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.find [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.findIndex_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.findIndex [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.fill_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.fill [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/keys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/keys "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.values_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.values [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.entries_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.entries [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/entries "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[14]](#chrome-experimental-note) | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype.splice_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype.splice [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice "MDN documentation")  | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype[Symbol.iterator]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@iterator_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype[Symbol.iterator] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@iterator "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array_iterator_prototype_chain)Array iterator prototype chain | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array.prototype_methods_Array.prototype[Symbol.unscopables]_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@unscopables_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Array.prototype[Symbol.unscopables] [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@unscopables "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Number_properties)[Number properties](http://www.ecma-international.org/ecma-262/6.0/#sec-isfinite-number) | 0/9 | 7/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 6/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 7/9 | 7/9 | 7/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 0/9 | 0/9 | 0/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 2/9 | 2/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | | [§](#test-Number_properties_Number.isFinite_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.isFinite [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.isInteger_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.isInteger [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.isSafeInteger_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.isSafeInteger [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.isNaN_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.isNaN [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.parseFloat_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseFloat_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.parseFloat [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseFloat "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.parseInt_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.parseInt [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.EPSILON_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.EPSILON [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.MIN_SAFE_INTEGER_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MIN_SAFE_INTEGER_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.MIN\_SAFE\_INTEGER [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MIN_SAFE_INTEGER "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Number_properties_Number.MAX_SAFE_INTEGER_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Number.MAX\_SAFE\_INTEGER [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods)[Math methods](http://www.ecma-international.org/ecma-262/6.0/#sec-math) | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 0/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 16/17 | 17/17 | 14/17 | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 8/17 | 8/17 | 17/17 | 17/17 | 17/17 | 0/17 | 0/17 | 0/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 1/17 | 1/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | 17/17 | | [§](#test-Math_methods_Math.clz32_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.clz32 [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32 "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.imul_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.imul [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.sign_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.sign [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.log10_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.log10 [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10 "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.log2_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.log2 [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2 "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.log1p_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.log1p [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.expm1_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.expm1 [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1 "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.cosh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cosh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.cosh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cosh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.sinh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sinh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.sinh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sinh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.tanh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.tanh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.acosh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acosh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.acosh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acosh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.asinh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asinh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.asinh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asinh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.atanh_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atanh_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.atanh [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atanh "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.trunc_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.trunc [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Flag[[14]](#chrome-experimental-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.fround_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.fround [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | No[[32]](#closure-mathfround-note) | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.cbrt_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cbrt_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.cbrt [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cbrt "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Math_methods_Math.hypot_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Math.hypot [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot "MDN documentation")  | ? | Yes | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Date.prototype[Symbol.toPrimitive])[Date.prototype[Symbol.toPrimitive]](http://www.ecma-international.org/ecma-262/6.0/#sec-date.prototype-@@toprimitive) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/@@toPrimitive "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Subclassing | | [§](#test-Array_is_subclassable)[Array is subclassable](http://www.ecma-international.org/ecma-262/6.0/#sec-array-constructor) | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 3/11 | 3/11 | 3/11 | 3/11 | 3/11 | 3/11 | 3/11 | 3/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 5/11 | | [§](#test-Array_is_subclassable_length_property_(accessing))length property (accessing) | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_is_subclassable_length_property_(setting))length property (setting) | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_is_subclassable_correct_prototype_chain)correct prototype chain | ? | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.isArray_support)Array.isArray support | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_is_subclassable_Array.prototype.concat)Array.prototype.concat | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.prototype.filter)Array.prototype.filter | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.prototype.map)Array.prototype.map | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.prototype.slice)Array.prototype.slice | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.prototype.splice)Array.prototype.splice | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Array_is_subclassable_Array.from)Array.from | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Array_is_subclassable_Array.of)Array.of | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_is_subclassable)[RegExp is subclassable](http://www.ecma-international.org/ecma-262/6.0/#sec-regexp-constructor) | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 3/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 3/4 | | [§](#test-RegExp_is_subclassable_basic_functionality)basic functionality | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_is_subclassable_correct_prototype_chain)correct prototype chain | ? | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No | No | No | No | No | No | No | No | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-RegExp_is_subclassable_RegExp.prototype.exec)RegExp.prototype.exec | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_is_subclassable_RegExp.prototype.test)RegExp.prototype.test | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Function_is_subclassable)[Function is subclassable](http://www.ecma-international.org/ecma-262/6.0/#sec-function-constructor) | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 5/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 0/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 4/6 | | [§](#test-Function_is_subclassable_can_be_called)can be called | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Function_is_subclassable_correct_prototype_chain)correct prototype chain | ? | ? | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No[[21]](#compiler-proto-note) | No | No | No | No | No | No | No | No | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Function_is_subclassable_can_be_used_with_new)can be used with "new" | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Function_is_subclassable_Function.prototype.call)Function.prototype.call | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Function_is_subclassable_Function.prototype.apply)Function.prototype.apply | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Function_is_subclassable_Function.prototype.bind)Function.prototype.bind | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise_is_subclassable)[Promise is subclassable](http://www.ecma-international.org/ecma-262/6.0/#sec-function-constructor) | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 1/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 2/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 2/4 | | [§](#test-Promise_is_subclassable_basic_functionality)basic functionality | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_is_subclassable_correct_prototype_chain)correct prototype chain | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Promise_is_subclassable_Promise.all)Promise.all | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Promise_is_subclassable_Promise.race)Promise.race | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | No | No | No | No | No | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-miscellaneous_subclassables)[miscellaneous subclassables](http://www.ecma-international.org/ecma-262/6.0/#sec-boolean-constructor) | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 2/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | | [§](#test-miscellaneous_subclassables_Boolean_is_subclassable)Boolean is subclassable | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_subclassables_Number_is_subclassable)Number is subclassable | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_subclassables_String_is_subclassable)String is subclassable | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_subclassables_Error_is_subclassable)Error is subclassable | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_subclassables_Map_is_subclassable)Map is subclassable | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_subclassables_Set_is_subclassable)Set is subclassable | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Misc | | [§](#test-prototype_of_bound_functions)[prototype of bound functions](http://www.ecma-international.org/ecma-262/6.0/#sec-boundfunctioncreate) | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 0/5 | 4/5 | 5/5 | 3/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 1/5 | 1/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | | [§](#test-prototype_of_bound_functions_basic_functions)basic functions | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-prototype_of_bound_functions_generator_functions)generator functions | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-prototype_of_bound_functions_arrow_functions)arrow functions | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-prototype_of_bound_functions_classes)classes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-prototype_of_bound_functions_subclasses)subclasses | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls)[Proxy, internal 'get' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/get "MDN documentation")  | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 1/36 | 1/36 | 1/36 | 1/36 | 1/36 | 1/36 | 1/36 | 1/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 0/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 0/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 0/36 | 9/36 | 0/36 | 19/36 | 34/36 | 0/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 12/36 | 12/36 | 35/36 | 36/36 | 36/36 | 0/36 | 0/36 | 0/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 35/36 | 28/36 | 29/36 | 36/36 | 36/36 | 36/36 | 36/36 | 0/36 | 0/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 36/36 | 30/36 | | [§](#test-Proxy,_internal_'get'_calls_ToPrimitive)ToPrimitive | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_CreateListFromArrayLike)CreateListFromArrayLike | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_instanceof_operator)instanceof operator | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_HasBinding)HasBinding | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | No[[30]](#ejs-no-with-note) | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_CreateDynamicFunction)CreateDynamicFunction | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_ClassDefinitionEvaluation)ClassDefinitionEvaluation | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No[[20]](#hermes-class-note) | No[[20]](#hermes-class-note) | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_IteratorComplete,_IteratorValue)IteratorComplete, IteratorValue | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_ToPropertyDescriptor)ToPropertyDescriptor | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Object.assign)Object.assign | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Object.defineProperties)Object.defineProperties | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Function.prototype.bind)Function.prototype.bind | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Error.prototype.toString)Error.prototype.toString | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_String.raw)String.raw | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp_constructor)RegExp constructor | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype.flags)RegExp.prototype.flags | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Flag[[33]](#graalvm-js-ecmascript-version-6-note) | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype.test)RegExp.prototype.test | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype.toString)RegExp.prototype.toString | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype[Symbol.match])RegExp.prototype[Symbol.match] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype[Symbol.replace])RegExp.prototype[Symbol.replace] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype[Symbol.search])RegExp.prototype[Symbol.search] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_RegExp.prototype[Symbol.split])RegExp.prototype[Symbol.split] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_Array.from)Array.from | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.concat)Array.prototype.concat | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype_iteration_methods)Array.prototype iteration methods | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.pop)Array.prototype.pop | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.reverse)Array.prototype.reverse | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.shift)Array.prototype.shift | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.splice)Array.prototype.splice | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'get'_calls_Array.prototype.toString)Array.prototype.toString | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_JSON.stringify)JSON.stringify | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Promise_resolve_functions)Promise resolve functions | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_String.prototype.match)String.prototype.match | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_String.prototype.replace)String.prototype.replace | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_String.prototype.search)String.prototype.search | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_String.prototype.split)String.prototype.split | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'get'_calls_Date.prototype.toJSON)Date.prototype.toJSON | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls)[Proxy, internal 'set' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set "MDN documentation")  | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 9/11 | 0/11 | 3/11 | 11/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 7/11 | 7/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 0/11 | 0/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | 11/11 | | [§](#test-Proxy,_internal_'set'_calls_Object.assign)Object.assign | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.from)Array.from | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.of)Array.of | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.copyWithin)Array.prototype.copyWithin | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.fill)Array.prototype.fill | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.pop)Array.prototype.pop | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.push)Array.prototype.push | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.reverse)Array.prototype.reverse | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.shift)Array.prototype.shift | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.splice)Array.prototype.splice | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'set'_calls_Array.prototype.unshift)Array.prototype.unshift | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'defineProperty'_calls)[Proxy, internal 'defineProperty' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/defineProperty "MDN documentation")  | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | | [§](#test-Proxy,_internal_'defineProperty'_calls_[[Set]])[[Set]] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'defineProperty'_calls_SetIntegrityLevel)SetIntegrityLevel | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'deleteProperty'_calls)[Proxy, internal 'deleteProperty' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/deleteProperty "MDN documentation")  | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 6/6 | 0/6 | 1/6 | 6/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 5/6 | 5/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 0/6 | 0/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.copyWithin)Array.prototype.copyWithin | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.pop)Array.prototype.pop | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.reverse)Array.prototype.reverse | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.shift)Array.prototype.shift | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.splice)Array.prototype.splice | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'deleteProperty'_calls_Array.prototype.unshift)Array.prototype.unshift | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'getOwnPropertyDescriptor'_calls)[Proxy, internal 'getOwnPropertyDescriptor' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getOwnPropertyDescriptor "MDN documentation")  | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 2/4 | 4/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 3/4 | 4/4 | 4/4 | 4/4 | 4/4 | 0/4 | 0/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 4/4 | 3/4 | | [§](#test-Proxy,_internal_'getOwnPropertyDescriptor'_calls_[[Set]])[[Set]] | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'getOwnPropertyDescriptor'_calls_Object.assign)Object.assign | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'getOwnPropertyDescriptor'_calls_Object.prototype.hasOwnProperty)Object.prototype.hasOwnProperty | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'getOwnPropertyDescriptor'_calls_Function.prototype.bind)Function.prototype.bind | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Proxy,_internal_'ownKeys'_calls)[Proxy, internal 'ownKeys' calls](http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/ownKeys "MDN documentation")  | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 2/3 | 0/3 | 3/3 | 3/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | | [§](#test-Proxy,_internal_'ownKeys'_calls_SetIntegrityLevel)SetIntegrityLevel | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'ownKeys'_calls_TestIntegrityLevel)TestIntegrityLevel | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Proxy,_internal_'ownKeys'_calls_SerializeJSONObject)SerializeJSONObject | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives)[Object static methods accept primitives](http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-object-constructor) | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 9/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 0/10 | 0/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | 10/10 | | [§](#test-Object_static_methods_accept_primitives_Object.getPrototypeOf_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.getPrototypeOf [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.getOwnPropertyDescriptor_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.getOwnPropertyDescriptor [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.getOwnPropertyNames_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.getOwnPropertyNames [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.seal_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.seal [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.freeze_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.freeze [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.preventExtensions_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.preventExtensions [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.isSealed_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.isSealed [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.isFrozen_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.isFrozen [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.isExtensible_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.isExtensible [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object_static_methods_accept_primitives_Object.keys_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)Object.keys [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order)[own property order](http://www.ecma-international.org/ecma-262/6.0/#sec-ordinary-object-internal-methods-and-internal-slots-ownpropertykeys) | 0/7 | 0/7 | 1/7 | 1/7 | 1/7 | 0/7 | 0/7 | 0/7 | 0/7 | 0/7 | 0/7 | 0/7 | 0/7 | 0/7 | 1/7 | 1/7 | 1/7 | 1/7 | 1/7 | 1/7 | 1/7 | 1/7 | 0/7 | 4/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 4/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 5/7 | 7/7 | 2/7 | 3/7 | 7/7 | 5/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 2/7 | 2/7 | 2/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 3/7 | 3/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | 7/7 | | [§](#test-own_property_order_Object.keys)Object.keys | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_Object.getOwnPropertyNames)Object.getOwnPropertyNames | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[0]](#ie_property_order-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_Object.assign)Object.assign | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_JSON.stringify)JSON.stringify | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[0]](#ie_property_order-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_JSON.parse)JSON.parse | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[34]](#ie_property_order-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_Reflect.ownKeys,_string_key_order)Reflect.ownKeys, string key order | ? | ? | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | ? | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | No[[35]](#forin-order-note) | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-own_property_order_Reflect.ownKeys,_symbol_key_order)Reflect.ownKeys, symbol key order | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | No | No | No | No | No | No | No | No | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Updated_identifier_syntax)[Updated identifier syntax](http://www.ecma-international.org/ecma-262/6.0/#sec-names-and-keywords) | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 0/3 | 0/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 2/3 | 0/3 | 0/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 1/3 | 3/3 | 3/3 | 0/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 2/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | | [§](#test-Updated_identifier_syntax_var_ⸯ;)var ⸯ; | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-Updated_identifier_syntax_var_𐋀;)var 𐋀; | ? | ? | ? | ? | ? | No | No | No | No | No | No | No | No | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Updated_identifier_syntax_no_escaped_reserved_words_as_identifiers)no escaped reserved words as identifiers | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-miscellaneous)[miscellaneous](http://www.ecma-international.org/ecma-262/6.0/#sec-additions-and-changes-that-introduce-incompatibilities-with-prior-editions) | 0/9 | 0/9 | 5/9 | 5/9 | 5/9 | 2/9 | 2/9 | 2/9 | 2/9 | 2/9 | 2/9 | 2/9 | 2/9 | 0/9 | 5/9 | 5/9 | 5/9 | 5/9 | 5/9 | 5/9 | 5/9 | 2/9 | 1/9 | 2/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 2/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 3/9 | 4/9 | 2/9 | 5/9 | 7/9 | 8/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 7/9 | 7/9 | 9/9 | 9/9 | 9/9 | 2/9 | 4/9 | 4/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 6/9 | 7/9 | 9/9 | 9/9 | 9/9 | 9/9 | 2/9 | 2/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 9/9 | 7/9 | | [§](#test-miscellaneous_duplicate_property_names_in_strict_mode)duplicate property names in strict mode | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_no_semicolon_needed_after_do-while)no semicolon needed after do-while | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_no_assignments_allowed_in_for-in_head_in_strict_mode)no assignments allowed in for-in head in strict mode | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-miscellaneous_accessors_aren't_constructors)accessors aren't constructors | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-miscellaneous_Invalid_Date)Invalid Date | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_RegExp_constructor_can_alter_flags)RegExp constructor can alter flags | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | ? | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_RegExp.prototype.toString_generic_and_uses_flags_property)RegExp.prototype.toString generic and uses "flags" property | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_built-in_prototypes_are_not_instances)built-in prototypes are not instances | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-miscellaneous_function_'length'_is_configurable)function 'length' is configurable | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | Annex b | | [§](#test-non-strict_function_semantics)[non-strict function semantics](http://www.ecma-international.org/ecma-262/6.0/#sec-labelled-function-declarations)[[36]](#hoisted-block-functions-note) | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 0/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 2/3 | 3/3 | 3/3 | 3/3 | 0/3 | 1/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | | [§](#test-non-strict_function_semantics_hoisted_block-level_function_declaration)hoisted block-level function declaration | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-non-strict_function_semantics_labeled_function_statements)labeled function statements | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-non-strict_function_semantics_function_statements_in_if-statement_clauses)function statements in if-statement clauses | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-__proto___in_object_literals)[\_\_proto\_\_ in object literals](http://www.ecma-international.org/ecma-262/6.0/#sec-__proto__-property-names-in-object-initializers) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto#Specifications "MDN documentation") [[37]](#proto-in-object-literals-note) | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 0/5 | 1/5 | 1/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 1/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 2/5 | 2/5 | 1/5 | 0/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 0/5 | 0/5 | 5/5 | 5/5 | 5/5 | 1/5 | 3/5 | 3/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 3/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 1/5 | 1/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | | [§](#test-__proto___in_object_literals_basic_support)basic support | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-__proto___in_object_literals_multiple___proto___is_an_error)multiple \_\_proto\_\_ is an error | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-__proto___in_object_literals_not_a_computed_property)not a computed property | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-__proto___in_object_literals_not_a_shorthand_property)not a shorthand property | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-__proto___in_object_literals_not_a_shorthand_method)not a shorthand method | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto__)[Object.prototype.\_\_proto\_\_](http://www.ecma-international.org/ecma-262/6.0/#sec-object.prototype.__proto__) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto "MDN documentation")  | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 0/6 | 3/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 2/6 | 2/6 | 6/6 | 2/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | 6/6 | | [§](#test-Object.prototype.__proto___get_prototype)get prototype | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto___set_prototype)set prototype | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto___absent_from_Object.create(null))absent from Object.create(null) | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto___present_in_hasOwnProperty())present in hasOwnProperty() | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto___correct_property_descriptor)correct property descriptor | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-Object.prototype.__proto___present_in_Object.getOwnPropertyNames())present in Object.getOwnPropertyNames() | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-String.prototype_HTML_methods)[String.prototype HTML methods](http://www.ecma-international.org/ecma-262/6.0/#sec-string.prototype.anchor) | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 1/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 2/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | 0/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 3/3 | 0/3 | | [§](#test-String.prototype_HTML_methods_existence_a_href=_https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/prototype#HTML_wrapper_methods_title=_MDN_documentation_img_src=_../mdn.png_alt=_MDN_(Mozilla_Development_Network)_logo_width=_15_height=_13_/_/a_nbsp;)existence [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/prototype#HTML_wrapper_methods "MDN documentation")  | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-String.prototype_HTML_methods_tags'_names_are_lowercase)tags' names are lowercase | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-String.prototype_HTML_methods_quotes_in_arguments_are_escaped)quotes in arguments are escaped | ? | ? | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | Yes[[10]](#babel-core-js-note) | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes[[15]](#typescript-core-js-note) | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-RegExp.prototype.compile)[RegExp.prototype.compile](http://www.ecma-international.org/ecma-262/6.0/#sec-regexp.prototype.compile) [MDN (Mozilla Development Network) logo](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/compile "MDN documentation")  | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 1/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 0/2 | 1/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | 0/2 | 2/2 | 2/2 | 2/2 | 2/2 | 1/2 | 1/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 0/2 | | [§](#test-RegExp.prototype.compile_basic_functionality)basic functionality | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | Yes | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-RegExp.prototype.compile_returns_this)returns this | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-RegExp_syntax_extensions)[RegExp syntax extensions](http://www.ecma-international.org/ecma-262/6.0/#sec-regular-expressions-patterns) | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 0/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 6/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 6/8 | 6/8 | 8/8 | 4/8 | 5/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 3/8 | 3/8 | 8/8 | 8/8 | 8/8 | 7/8 | 7/8 | 7/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 7/8 | 7/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 8/8 | 7/8 | | [§](#test-RegExp_syntax_extensions_hyphens_in_character_sets)hyphens in character sets | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_invalid_character_escapes)invalid character escapes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_invalid_control-character_escapes)invalid control-character escapes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | | [§](#test-RegExp_syntax_extensions_invalid_Unicode_escapes)invalid Unicode escapes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_invalid_hexadecimal_escapes)invalid hexadecimal escapes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_incomplete_patterns_and_quantifiers)incomplete patterns and quantifiers | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_octal_escape_sequences)octal escape sequences | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | [§](#test-RegExp_syntax_extensions_invalid_backreferences_become_octal_escapes)invalid backreferences become octal escapes | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | ? | ? | ? | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No |, ECMAScript 6 compatibility table, compat-table.github.io, 01ka4d3kw4we8xnyd5mnqqhvpg.