Now Stable

"New on the Web": For a given set of browsers, what APIs became stable and when, ordered reverse chronologically.

It's a great source of information for posts like this

Example Comparisons
Browsers
Features

Stable APIs

Below is a list of features that are in Chrome, Safari, and Edge, ordered reverse chronologically by when they became stable (i.e, available in the last browser).

2024/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Promise.try 📋Chrome8/20/2024 Safari12/11/2024113

2024/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.Locale.getCalendars 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getCollations 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getHourCycles 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getNumberingSystems 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTextInfo 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTimeZones 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getWeekInfo 📋Safari9/18/2023 Edge10/17/2024395
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.

2024/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DurationFormat 📋Safari3/27/2023 Edge9/19/2024542
javascript.builtins.Intl.DurationFormat.DurationFormat 📋Safari3/27/2023 Edge9/19/2024542
javascript.builtins.Intl.DurationFormat.format 📋Safari3/27/2023 Edge9/19/2024542
javascript.builtins.Intl.DurationFormat.formatToParts 📋Safari3/27/2023 Edge9/19/2024542
javascript.builtins.Intl.DurationFormat.resolvedOptions 📋Safari3/27/2023 Edge9/19/2024542
javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋Safari3/27/2023 Edge9/19/2024542

2024/5

API First Browser Date Last Browser Date Days Notes
javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups Safari9/18/2023 Edge5/17/2024242

2024/3

API First Browser Date Last Browser Date Days Notes
javascript.statements.import.import_attributes 📋Safari12/11/2023 Edge3/22/2024102
javascript.statements.import.import_attributes.type_json Safari12/11/2023 Edge3/22/2024102
javascript.builtins.ArrayBuffer.detached 📋Chrome5/30/2023 Safari3/5/2024280
javascript.builtins.ArrayBuffer.transfer 📋Chrome5/30/2023 Safari3/5/2024280
javascript.builtins.ArrayBuffer.transferToFixedLength 📋Chrome5/30/2023 Safari3/5/2024280
javascript.builtins.Map.groupBy 📋Chrome9/12/2023 Safari3/5/2024175
javascript.builtins.Object.groupBy 📋Chrome9/12/2023 Safari3/5/2024175
javascript.builtins.Promise.withResolvers 📋Chrome10/31/2023 Safari3/5/2024126

2024/2

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Set.difference 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.intersection 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.isDisjointFrom 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.isSubsetOf 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.isSupersetOf 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.symmetricDifference 📋Safari9/18/2023 Edge2/23/2024158
javascript.builtins.Set.union 📋Safari9/18/2023 Edge2/23/2024158

2024/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.fromAsync 📋Safari3/27/2023 Edge1/25/2024304

2023/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingMode_parameter Chrome9/12/2023 Safari12/11/202390

2023/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.AggregateError.serializable_object Chrome2/1/2022 Safari9/18/2023594
Chrome: AggregateError serializes to the Error type, without additional properties.Chrome Android: AggregateError serializes to the Error type, without additional properties.Edge: AggregateError serializes to the Error type, without additional properties.Firefox: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Firefox for Android: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Quest Browser: AggregateError serializes to the Error type, without additional properties.Opera: AggregateError serializes to the Error type, without additional properties.Opera Android: AggregateError serializes to the Error type, without additional properties.Samsung Internet: AggregateError serializes to the Error type, without additional properties.WebView Android: AggregateError serializes to the Error type, without additional properties.
javascript.builtins.Function.toString.toString_revision Chrome4/17/2018 Safari9/18/20231980
javascript.builtins.RegExp.unicodeSets 📋Chrome4/4/2023 Safari9/18/2023167

2023/3

API First Browser Date Last Browser Date Days Notes
javascript.builtins.ArrayBuffer.ArrayBuffer.maxByteLength_option 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.ArrayBuffer.maxByteLength 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.ArrayBuffer.resizable 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.ArrayBuffer.resize 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.Atomics.waitAsync 📋Chrome11/17/2020 Safari3/27/2023860
javascript.builtins.FinalizationRegistry.symbol_as_target Chrome1/10/2023 Safari3/27/202376
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter.string_values Chrome9/27/2022 Safari3/27/2023181
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer.maxByteLength_option 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.SharedArrayBuffer.grow 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.SharedArrayBuffer.growable 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.SharedArrayBuffer.maxByteLength 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.String.isWellFormed 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.String.toWellFormed 📋Chrome3/7/2023 Safari3/27/202320
javascript.builtins.WeakMap.symbol_as_keys Chrome1/10/2023 Safari3/27/202376
javascript.builtins.WeakRef.symbol_as_target Chrome1/10/2023 Safari3/27/202376
javascript.builtins.WeakSet.symbol_as_keys Chrome1/10/2023 Safari3/27/202376
javascript.classes.static_initialization_blocks 📋Chrome9/21/2021 Safari3/27/2023552
javascript.operators.import_meta.resolve 📋Edge9/1/2022 Safari3/27/2023207
Node.js: Returns a URL object instead of a string.
javascript.regular_expressions.lookbehind_assertion 📋Chrome10/17/2017 Safari3/27/20231987

2023/2

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.toReversed 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.Array.toSorted 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.Array.toSpliced 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.Array.with 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.TypedArray.toReversed 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.TypedArray.toSorted 📋Safari9/12/2022 Edge2/9/2023150
javascript.builtins.TypedArray.with 📋Safari9/12/2022 Edge2/9/2023150

2022/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.format.number_parameter-string_decimal Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.formatRange 📋Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.NumberFormat.formatRangeToParts 📋Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingPriority_parameter Safari3/14/2022 Edge10/3/2022203
javascript.builtins.Intl.PluralRules.selectRange 📋Safari3/14/2022 Edge10/3/2022203

2022/9

API First Browser Date Last Browser Date Days Notes
javascript.classes.public_class_fields 📋Chrome1/29/2019 Safari9/12/20221322
Safari: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari: Doesn't support public static fields. See bug 194095.Safari on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari on iOS: Doesn't support public static fields. See bug 194095.WebView on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.WebView on iOS: Doesn't support public static fields. See bug 194095.

2022/3

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.at 📋Chrome7/20/2021 Safari3/14/2022237
javascript.builtins.Array.findLast 📋Chrome1/4/2022 Safari3/14/202269
javascript.builtins.Array.findLastIndex 📋Chrome1/4/2022 Safari3/14/202269
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values Chrome10/19/2021 Safari3/14/2022146
javascript.builtins.Intl.supportedValuesOf 📋Chrome3/1/2022 Safari3/14/202213
javascript.builtins.Object.hasOwn 📋Chrome8/31/2021 Safari3/14/2022195
javascript.builtins.String.at 📋Chrome7/20/2021 Safari3/14/2022237
javascript.builtins.TypedArray.at 📋Chrome7/20/2021 Safari3/14/2022237
javascript.builtins.TypedArray.findLast 📋Chrome1/4/2022 Safari3/14/202269
javascript.builtins.TypedArray.findLastIndex 📋Chrome1/4/2022 Safari3/14/202269

2021/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Atomics 📋Chrome7/24/2018 Safari12/13/20211238
Safari: Before Safari 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.Safari on iOS: Before Safari on iOS 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.WebView on iOS: Before WebView on iOS 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.
javascript.builtins.Atomics.add 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.and 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.compareExchange 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.exchange 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.isLockFree 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.load 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.notify 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.or 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.store 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.sub 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.wait 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.Atomics.xor 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.DataView.DataView.sharedarraybuffer_support Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.SharedArrayBuffer 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.SharedArrayBuffer.@@species 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.SharedArrayBuffer.byteLength 📋Chrome7/24/2018 Safari12/13/20211238
javascript.builtins.SharedArrayBuffer.slice 📋Chrome7/24/2018 Safari12/13/20211238

2021/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.BigInt64Array 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.BigInt64Array.BigInt64Array 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.BigUint64Array 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.BigUint64Array.BigUint64Array 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.DataView.getBigInt64 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.DataView.getBigUint64 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.DataView.setBigInt64 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.DataView.setBigUint64 📋Chrome5/29/2018 Safari9/20/20211210
javascript.builtins.Error.Error.options_cause_parameter 📋Chrome8/31/2021 Safari9/20/202120
javascript.builtins.Error.cause 📋Chrome8/31/2021 Safari9/20/202120
javascript.builtins.RegExp.hasIndices 📋Chrome4/13/2021 Safari9/20/2021160
javascript.classes.private_class_fields_in 📋Chrome5/25/2021 Safari9/20/2021118
javascript.classes.private_class_methods 📋Edge7/16/2020 Safari9/20/2021431
javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import Chrome5/25/2021 Safari9/20/2021118
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.operators.await.top_level 📋Chrome3/2/2021 Safari9/20/2021202
Node.js: Not supported in CommonJS modules.
javascript.operators.import.options_parameter Chrome5/25/2021 Safari9/20/2021118
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.operators.import.worker_support Chrome2/4/2020 Safari9/20/2021594
javascript.statements.import.service_worker_support Chrome5/25/2021 Safari9/20/2021118
javascript.statements.import.worker_support Chrome2/4/2020 Safari9/20/2021594

2021/7

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter Safari4/26/2021 Edge7/22/202187

2021/5

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.IntlLegacyConstructedSymbol 📋Safari4/26/2021 Edge5/27/202131
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.
javascript.builtins.Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol 📋Safari4/26/2021 Edge5/27/202131
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.

2021/4

API First Browser Date Last Browser Date Days Notes
javascript.builtins.FinalizationRegistry 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.FinalizationRegistry.FinalizationRegistry 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.FinalizationRegistry.register 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.FinalizationRegistry.unregister 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.Intl.Collator.Collator.options_collation_parameter Edge10/9/2020 Safari4/26/2021199
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter Chrome2/4/2020 Safari4/26/2021447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter Chrome7/30/2019 Safari4/26/2021636
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter Edge7/16/2020 Safari4/26/2021284
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter Chrome2/4/2020 Safari4/26/2021447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter Chrome7/30/2019 Safari4/26/2021636
javascript.builtins.Intl.DateTimeFormat.formatRange 📋Chrome7/30/2019 Safari4/26/2021636
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.formatRangeToParts 📋Chrome7/30/2019 Safari4/26/2021636
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DisplayNames 📋Chrome4/7/2020 Safari4/26/2021384
javascript.builtins.Intl.DisplayNames.DisplayNames 📋Chrome4/7/2020 Safari4/26/2021384
javascript.builtins.Intl.DisplayNames.of 📋Chrome4/7/2020 Safari4/26/2021384
javascript.builtins.Intl.DisplayNames.resolvedOptions 📋Chrome4/7/2020 Safari4/26/2021384
javascript.builtins.Intl.DisplayNames.supportedLocalesOf 📋Chrome4/7/2020 Safari4/26/2021384
javascript.builtins.Intl.ListFormat 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.ListFormat 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the ListFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.format 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.formatToParts 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.resolvedOptions 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.supportedLocalesOf 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter Chrome9/10/2019 Safari4/26/2021594
Safari: Doesn't support currencyDisplay: 'narrowSymbol'.Safari on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.WebView on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencySign_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter Chrome9/10/2019 Safari4/26/2021594
javascript.builtins.Intl.Segmenter 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segmenter.Segmenter 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segmenter.resolvedOptions 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segmenter.segment 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segmenter.supportedLocalesOf 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segments 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segments.@@iterator 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.Intl.Segments.containing 📋Chrome11/17/2020 Safari4/26/2021160
javascript.builtins.WeakRef 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.WeakRef.WeakRef 📋Edge7/16/2020 Safari4/26/2021284
javascript.builtins.WeakRef.deref 📋Edge7/16/2020 Safari4/26/2021284
javascript.classes.private_class_fields 📋Chrome4/23/2019 Safari4/26/2021734
javascript.classes.static_class_fields 📋Chrome1/29/2019 Safari4/26/2021818
javascript.statements.export.namespace 📋Chrome1/29/2019 Safari4/26/2021818
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.

2020/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.AggregateError 📋Chrome8/25/2020 Safari9/16/202022
javascript.builtins.AggregateError.AggregateError 📋Chrome8/25/2020 Safari9/16/202022
javascript.builtins.AggregateError.errors 📋Chrome8/25/2020 Safari9/16/202022
javascript.builtins.BigInt 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.BigInt 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.asIntN 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.asUintN 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.toLocaleString 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.toLocaleString.locales_parameter Chrome7/30/2019 Safari9/16/2020414
Deno: Only the locale data for en-US is available.
javascript.builtins.BigInt.toLocaleString.options_parameter Chrome7/30/2019 Safari9/16/2020414
javascript.builtins.BigInt.toString 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.BigInt.valueOf 📋Chrome5/29/2018 Safari9/16/2020841
javascript.builtins.Intl.Locale 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.Locale 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.baseName 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.calendar 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.caseFirst 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.collation 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.hourCycle 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.language 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.maximize 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.minimize 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.numberingSystem 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.numeric 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.region 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.script 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.Locale.toString 📋Chrome4/23/2019 Safari9/16/2020512
javascript.builtins.Intl.RelativeTimeFormat 📋Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat 📋Chrome12/4/2018 Safari9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.locales_parameter Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the RelativeTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_localeMatcher_parameter Chrome12/4/2018 Safari9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numberingSystem_parameter Chrome12/4/2018 Safari9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numeric_parameter Chrome12/4/2018 Safari9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.format 📋Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.formatToParts 📋Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.resolvedOptions 📋Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.supportedLocalesOf 📋Chrome12/4/2018 Safari9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Promise.any 📋Chrome8/25/2020 Safari9/16/202022
javascript.builtins.Symbol.toStringTag.dom_objects Chrome4/13/2016 Safari9/16/20201617
javascript.operators.logical_and_assignment 📋Chrome8/25/2020 Safari9/16/202022
javascript.operators.logical_or_assignment 📋Chrome8/25/2020 Safari9/16/202022
javascript.operators.nullish_coalescing_assignment 📋Chrome8/25/2020 Safari9/16/202022

2020/8

API First Browser Date Last Browser Date Days Notes
javascript.builtins.String.replaceAll 📋Safari3/24/2020 Edge8/27/2020156

2020/3

API First Browser Date Last Browser Date Days Notes
javascript.grammar.hashbang_comments 📋Chrome4/23/2019 Safari3/24/2020336
javascript.operators.nullish_coalescing 📋Chrome2/4/2020 Safari3/24/202049
javascript.operators.optional_chaining 📋Chrome2/4/2020 Safari3/24/202049

2020/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.@@species 📋Chrome5/25/2016 Edge1/15/20201330
javascript.builtins.Array.flat 📋Chrome9/4/2018 Edge1/15/2020498
javascript.builtins.Array.flatMap 📋Chrome9/4/2018 Edge1/15/2020498
javascript.builtins.Array.sort.stable_sorting Safari3/27/2017 Edge1/15/20201024
javascript.builtins.Array.toLocaleString.locales_parameter Chrome1/10/2013 Edge1/15/20202561
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Array.toLocaleString.options_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.AsyncGenerator 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncGenerator.next 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncGenerator.return 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncGenerator.throw 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncGeneratorFunction 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncGeneratorFunction.AsyncGeneratorFunction 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncIterator 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.AsyncIterator.@@asyncIterator 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.Date.UTC.optional_monthIndex Chrome3/9/2017 Edge1/15/20201042
javascript.builtins.Function.name.inferred_names Chrome5/25/2016 Edge1/15/20201330
Edge: Names for functions defined in a dictionary are properly assigned; however, anonymous functions defined on a var/let variable assignment have blank names.
javascript.builtins.Intl.Collator.Collator.options_ignorePunctuation_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.Intl.Collator.Collator.options_localeMatcher_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.Intl.Collator.Collator.options_numeric_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.Intl.Collator.Collator.options_sensitivity_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.Intl.Collator.Collator.options_usage_parameter Chrome1/10/2013 Edge1/15/20202561
javascript.builtins.JSON.json_superset Chrome4/17/2018 Edge1/15/2020638
javascript.builtins.JSON.stringify.well_formed_stringify Chrome1/29/2019 Edge1/15/2020351
javascript.builtins.Object.fromEntries 📋Chrome3/12/2019 Edge1/15/2020309
javascript.builtins.Promise.@@species 📋Chrome5/25/2016 Edge1/15/20201330
javascript.builtins.Promise.allSettled 📋Chrome7/30/2019 Edge1/15/2020169
javascript.builtins.Proxy.handler.getPrototypeOf 📋Chrome3/2/2016 Edge1/15/20201414
javascript.builtins.RegExp.@@matchAll 📋Chrome3/12/2019 Edge1/15/2020309
javascript.builtins.RegExp.@@replace 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.RegExp.@@split 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.RegExp.dotAll 📋Chrome10/17/2017 Edge1/15/2020820
javascript.builtins.RegExp.flags 📋Safari9/30/2015 Edge1/15/20201568
javascript.builtins.String.matchAll 📋Chrome3/12/2019 Edge1/15/2020309
javascript.builtins.String.trimEnd 📋Chrome4/17/2018 Edge1/15/2020638
javascript.builtins.String.trimStart 📋Chrome4/17/2018 Edge1/15/2020638
javascript.builtins.Symbol.asyncIterator 📋Chrome12/6/2017 Edge1/15/2020770
javascript.builtins.Symbol.description 📋Chrome10/16/2018 Edge1/15/2020456
Safari: No support for an undefined description.Safari on iOS: No support for an undefined description.WebView on iOS: No support for an undefined description.
javascript.builtins.Symbol.match 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.Symbol.matchAll 📋Chrome3/12/2019 Edge1/15/2020309
javascript.builtins.Symbol.replace 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.Symbol.search 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.Symbol.split 📋Chrome4/13/2016 Edge1/15/20201372
javascript.builtins.globalThis 📋Chrome12/4/2018 Edge1/15/2020407
javascript.functions.method_definitions.async_generator_methods Chrome12/6/2017 Edge1/15/2020770
javascript.functions.rest_parameters.destructuring Chrome3/2/2016 Edge1/15/20201414
javascript.grammar.numeric_separators 📋Chrome6/4/2019 Edge1/15/2020225
javascript.grammar.template_literals.template_literal_revision Safari9/19/2017 Edge1/15/2020848
javascript.operators.async_generator_function 📋Chrome12/6/2017 Edge1/15/2020770
javascript.operators.destructuring.rest_in_objects Chrome7/25/2017 Edge1/15/2020904
javascript.operators.generator_function.trailing_comma Safari9/20/2016 Edge1/15/20201212
javascript.operators.import 📋Chrome12/6/2017 Edge1/15/2020770
Deno: Bundled Deno applications (using deno compile) do not support dynamic importsNode.js: Dynamic import can be used in either CommonJS or ES module files, to import either CommonJS or ES module files. See Node's ECMAScript Modules documentation for more details.Node.js: Dynamic import can be used in either CommonJS or ES module files, to import either CommonJS or ES module files. See Node's ECMAScript Modules documentation for more details.
javascript.operators.import_meta 📋Chrome1/23/2018 Edge1/15/2020722
javascript.operators.object_initializer.spread_properties Chrome7/25/2017 Edge1/15/2020904
javascript.operators.spread.spread_in_object_literals 📋Chrome7/25/2017 Edge1/15/2020904
javascript.regular_expressions.named_backreference 📋Chrome1/23/2018 Edge1/15/2020722
javascript.regular_expressions.named_capturing_group 📋Chrome1/23/2018 Edge1/15/2020722
javascript.regular_expressions.unicode_character_class_escape 📋Chrome1/23/2018 Edge1/15/2020722
javascript.statements.async_generator_function 📋Chrome12/6/2017 Edge1/15/2020770
javascript.statements.for_await_of 📋Chrome12/6/2017 Edge1/15/2020770
javascript.statements.try_catch.optional_catch_binding Safari4/12/2018 Edge1/15/2020643

2019/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter Edge10/2/2018 Safari9/19/2019352
javascript.builtins.Intl.NumberFormat.formatToParts 📋Edge7/29/2015 Safari9/19/20191513
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.PluralRules 📋Chrome12/6/2017 Safari9/19/2019652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the PluralRules() constructor for more details.
javascript.builtins.Intl.PluralRules.PluralRules 📋Chrome12/6/2017 Safari9/19/2019652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the PluralRules instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.PluralRules.resolvedOptions 📋Chrome12/6/2017 Safari9/19/2019652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the PluralRules() constructor for more details.
javascript.builtins.Intl.PluralRules.select 📋Chrome12/6/2017 Safari9/19/2019652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the PluralRules() constructor for more details.
javascript.builtins.Intl.PluralRules.supportedLocalesOf 📋Chrome12/6/2017 Safari9/19/2019652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the PluralRules() constructor for more details.

2019/3

API First Browser Date Last Browser Date Days Notes
javascript.builtins.RegExp.source.escaping Safari7/25/2012 Chrome3/12/20192421
javascript.builtins.RegExp.toString.escaping Safari7/25/2012 Chrome3/12/20192421

2018/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.Collator.Collator.options_caseFirst_parameter Chrome1/10/2013 Edge10/2/20182091
javascript.builtins.Intl.DateTimeFormat.formatToParts 📋Chrome3/9/2017 Edge10/2/2018572
Chrome: Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 41402623.Chrome Android: Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 41402623.Node.js: Before version 12.0.0, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 12.0.0 and later use the specification defined dayPeriod. See bug 41402623.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.Quest Browser: Before version 6.0, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 41402623.Opera: Before version 58, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 58 and later use the specification defined dayPeriod. See bug 41402623.Opera Android: Before version 50, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 50 and later use the specification defined dayPeriod. See bug 41402623.Samsung Internet: Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 41402623.WebView Android: Before version 71, formatToParts() returned an object with an incorrectly cased type key of dayperiod. Version 71 and later use the specification defined dayPeriod. See bug 41402623.
javascript.builtins.Promise.finally 📋Chrome12/6/2017 Edge10/2/2018300

2018/4

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.values 📋Safari9/30/2015 Chrome4/17/2018930

2017/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Proxy.revocable 📋Edge7/29/2015 Chrome12/6/2017861
javascript.statements.for_of.async_iterators Safari10/22/2013 Chrome12/6/20171506

2017/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.getCanonicalLocales 📋Chrome10/12/2016 Edge10/17/2017370
javascript.operators.destructuring.rest_in_arrays Chrome3/2/2016 Edge10/17/2017594
javascript.statements.export 📋Safari3/27/2017 Edge10/17/2017204
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.export.default 📋Safari3/27/2017 Edge10/17/2017204
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.import 📋Safari3/27/2017 Edge10/17/2017204
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.

2017/9

API First Browser Date Last Browser Date Days Notes
javascript.operators.new_target 📋Chrome10/13/2015 Safari9/19/2017707

2017/4

API First Browser Date Last Browser Date Days Notes
javascript.builtins.String.toLocaleLowerCase.locales_parameter Edge7/29/2015 Chrome4/19/2017630
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.String.toLocaleUpperCase.locales_parameter Edge7/29/2015 Chrome4/19/2017630
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.functions.arrow_functions.trailing_comma Edge7/29/2015 Chrome4/19/2017630
javascript.grammar.trailing_commas.trailing_commas_in_functions Edge8/2/2016 Chrome4/19/2017260
javascript.operators.function.trailing_comma Edge8/2/2016 Chrome4/19/2017260
javascript.statements.function.trailing_comma_in_parameters Edge8/2/2016 Chrome4/19/2017260
javascript.statements.generator_function.trailing_comma_in_parameters Edge8/2/2016 Chrome4/19/2017260
javascript.builtins.AsyncFunction 📋Chrome12/1/2016 Edge4/5/2017125
javascript.builtins.AsyncFunction.AsyncFunction 📋Chrome12/1/2016 Edge4/5/2017125
javascript.builtins.Date.@@toPrimitive 📋Chrome12/1/2015 Edge4/5/2017491
javascript.builtins.Function.@@hasInstance 📋Chrome4/13/2016 Edge4/5/2017357
javascript.builtins.Object.getOwnPropertyDescriptors 📋Safari9/20/2016 Edge4/5/2017197
javascript.builtins.String.padEnd 📋Safari9/20/2016 Edge4/5/2017197
javascript.builtins.String.padStart 📋Safari9/20/2016 Edge4/5/2017197
javascript.builtins.Symbol.@@toPrimitive 📋Chrome12/1/2015 Edge4/5/2017491
javascript.builtins.Symbol.hasInstance 📋Chrome4/13/2016 Edge4/5/2017357
javascript.builtins.Symbol.isConcatSpreadable 📋Chrome1/20/2016 Edge4/5/2017441
javascript.builtins.Symbol.toPrimitive 📋Chrome12/1/2015 Edge4/5/2017491
javascript.builtins.Symbol.toStringTag 📋Chrome3/2/2016 Edge4/5/2017399
javascript.functions.method_definitions.async_methods Chrome12/1/2016 Edge4/5/2017125
javascript.operators.async_function 📋Chrome12/1/2016 Edge4/5/2017125
javascript.statements.async_function 📋Chrome12/1/2016 Edge4/5/2017125

2017/3

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Object.entries 📋Edge8/2/2016 Safari3/27/2017237
javascript.builtins.Object.values 📋Edge8/2/2016 Safari3/27/2017237
javascript.operators.await 📋Edge8/2/2016 Safari3/27/2017237
javascript.operators.exponentiation 📋Chrome7/20/2016 Safari3/27/2017250
javascript.operators.exponentiation_assignment 📋Chrome7/20/2016 Safari3/27/2017250
javascript.statements.class 📋Edge11/12/2015 Safari3/27/2017501
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.

2016/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.@@iterator 📋Chrome10/7/2014 Safari9/20/2016714
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Array.@@unscopables 📋Chrome10/7/2014 Safari9/20/2016714
javascript.builtins.ArrayBuffer.@@species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.Date.toLocaleDateString.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Date.toLocaleDateString.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Date.toLocaleString.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Date.toLocaleString.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Date.toLocaleTimeString.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Date.toLocaleTimeString.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Float32Array.Float32Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Float64Array.Float64Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Function.length.configurable_true Chrome5/19/2015 Safari9/20/2016490
javascript.builtins.Function.name.configurable_true Chrome5/19/2015 Safari9/20/2016490
javascript.builtins.Generator 📋Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Generator.next 📋Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Generator.return 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.Generator.throw 📋Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.GeneratorFunction 📋Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.GeneratorFunction.GeneratorFunction 📋Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Int16Array.Int16Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Int32Array.Int32Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Int8Array.Int8Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Intl 📋Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.Collator 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the Collator() constructor for more details.
javascript.builtins.Intl.Collator.Collator 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the Collator instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.Collator.compare 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the Collator() constructor for more details.
javascript.builtins.Intl.Collator.resolvedOptions 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the Collator() constructor for more details.
javascript.builtins.Intl.Collator.supportedLocalesOf 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.DateTimeFormat 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the DateTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the DateTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.DateTimeFormat.format 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.resolvedOptions 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.resolvedOptions.computed_timezone Chrome5/20/2014 Safari9/20/2016854
javascript.builtins.Intl.DateTimeFormat.supportedLocalesOf 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.NumberFormat 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.NumberFormat.NumberFormat 📋Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the NumberFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the NumberFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.NumberFormat.format 📋Chrome1/10/2013 Safari9/20/20161349
Edge: Before Edge 18, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".Internet Explorer: In Internet Explorer 11, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.NumberFormat.resolvedOptions 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.NumberFormat.supportedLocalesOf 📋Chrome1/10/2013 Safari9/20/20161349
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Iterator 📋Chrome10/7/2014 Safari9/20/2016714
javascript.builtins.Iterator.@@iterator 📋Chrome10/7/2014 Safari9/20/2016714
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Map.@@iterator 📋Chrome10/7/2014 Safari9/20/2016714
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Map.@@species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.Number.toLocaleString.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Number.toLocaleString.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.Proxy 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.Proxy 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.apply 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.construct 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.defineProperty 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.deleteProperty 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.get 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.getOwnPropertyDescriptor 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.has 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.isExtensible 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.ownKeys 📋Edge7/29/2015 Safari9/20/2016419
Firefox: In Firefox 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.Firefox for Android: In Firefox for Android 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.
javascript.builtins.Proxy.handler.preventExtensions 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.set 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Proxy.handler.setPrototypeOf 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.apply 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.construct 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.defineProperty 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.deleteProperty 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.get 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.getOwnPropertyDescriptor 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.getPrototypeOf 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.has 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.isExtensible 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.ownKeys 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.preventExtensions 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.set 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.Reflect.setPrototypeOf 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.RegExp.@@match 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.@@search 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.@@species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.sticky 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.sticky.anchored_sticky_flag Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.sticky.prototype_accessor Edge11/12/2015 Safari9/20/2016313
javascript.builtins.RegExp.unicode 📋Edge7/29/2015 Safari9/20/2016419
Edge: Case folding is implemented in version 13Node.js: Case folding is implemented in version 8.6.0
javascript.builtins.Set.@@species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.String.localeCompare.locales_parameter Chrome1/10/2013 Safari9/20/20161349
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.String.localeCompare.options_parameter Chrome1/10/2013 Safari9/20/20161349
javascript.builtins.String.normalize 📋Chrome4/8/2014 Safari9/20/2016896
javascript.builtins.Symbol.iterator 📋Chrome5/19/2015 Safari9/20/2016490
javascript.builtins.Symbol.species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.TypedArray.@@iterator 📋Chrome10/7/2014 Safari9/20/2016714
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.TypedArray.@@species 📋Edge11/12/2015 Safari9/20/2016313
javascript.builtins.TypedArray.copyWithin 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.entries 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.every 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.fill 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.filter 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.find 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.findIndex 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.forEach 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.from 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.includes 📋Chrome12/1/2015 Safari9/20/2016294
javascript.builtins.TypedArray.indexOf 📋Edge7/29/2015 Safari9/20/2016419
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.iterable_in_constructor Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.TypedArray.join 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.keys 📋Chrome10/7/2014 Safari9/20/2016714
javascript.builtins.TypedArray.lastIndexOf 📋Edge7/29/2015 Safari9/20/2016419
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.map 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.of 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.reduce 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.reduceRight 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.reverse 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.slice 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.some 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.sort 📋Edge7/29/2015 Safari9/20/2016419
javascript.builtins.TypedArray.values 📋Chrome10/7/2014 Safari9/20/2016714
javascript.builtins.Uint16Array.Uint16Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Uint32Array.Uint32Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Uint8Array.Uint8Array.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.iterable_allowed Chrome11/18/2014 Safari9/20/2016672
javascript.functions.arrow_functions 📋Edge7/29/2015 Safari9/20/2016419
Firefox: The initial implementation of arrow functions in Firefox made them automatically strict. This has been changed as of Firefox 24. The use of 'use strict'; is now required.Firefox: Before Firefox 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.Firefox for Android: The initial implementation of arrow functions in Firefox for Android made them automatically strict. This has been changed as of Firefox for Android 24. The use of 'use strict'; is now required.Firefox for Android: Before Firefox for Android 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.
javascript.functions.block_level_functions Edge7/29/2015 Safari9/20/2016419
javascript.functions.default_parameters 📋Chrome3/2/2016 Safari9/20/2016202
javascript.functions.default_parameters.destructured_parameter_with_default_value_assignment Chrome3/2/2016 Safari9/20/2016202
javascript.functions.default_parameters.parameters_without_defaults_after_default_parameters Chrome3/2/2016 Safari9/20/2016202
javascript.functions.rest_parameters 📋Edge7/29/2015 Safari9/20/2016419
javascript.operators.destructuring.computed_property_names Chrome3/2/2016 Safari9/20/2016202
javascript.operators.generator_function 📋Edge7/29/2015 Safari9/20/2016419
javascript.operators.yield 📋Chrome11/18/2014 Safari9/20/2016672
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox: Starting with Firefox 29, an IteratorResult object returned for completed generator function.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 29, an IteratorResult object returned for completed generator function.
javascript.operators.yield_star 📋Chrome11/18/2014 Safari9/20/2016672
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.
javascript.regular_expressions.character_escape.unicode Edge7/29/2015 Safari9/20/2016419
javascript.statements.generator_function 📋Chrome11/18/2014 Safari9/20/2016672
javascript.statements.generator_function.IteratorResult_object Edge11/12/2015 Safari9/20/2016313
javascript.statements.generator_function.not_constructable_with_new Edge11/12/2015 Safari9/20/2016313
javascript.statements.let 📋Chrome3/2/2016 Safari9/20/2016202
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Edge: In Edge 12 and 13, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Firefox: Before Firefox 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox: Before Firefox 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox: Firefox 54 adds support of let in workers.Firefox for Android: Before Firefox for Android 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox for Android: Before Firefox for Android 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox for Android: Firefox for Android 54 adds support of let in workers.Internet Explorer: In Internet Explorer, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.

2016/8

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.includes 📋Safari9/30/2015 Edge8/2/2016307
javascript.builtins.Date.toLocaleDateString.iana_time_zone_names Chrome1/10/2013 Edge8/2/20161300
javascript.builtins.Date.toLocaleString.iana_time_zone_names Chrome1/10/2013 Edge8/2/20161300
javascript.builtins.Date.toLocaleTimeString.iana_time_zone_names Chrome1/10/2013 Edge8/2/20161300
javascript.builtins.Function.name 📋Chrome10/25/2011 Edge8/2/20161743
javascript.operators.destructuring 📋Safari10/16/2014 Edge8/2/2016656
Firefox: Firefox provided a non-standard destructuring implementation from Firefox 2 to 40.Firefox for Android: Firefox for Android provided a non-standard destructuring implementation from Firefox for Android 4 to 40.
javascript.statements.for_of.closing_iterators Safari10/22/2013 Edge8/2/20161015

2016/7

API First Browser Date Last Browser Date Days Notes
javascript.functions.arguments.@@iterator 📋Edge7/29/2015 Chrome7/20/2016357

2016/3

API First Browser Date Last Browser Date Days Notes
javascript.functions.get.computed_property_names Edge7/29/2015 Safari3/21/2016236
javascript.functions.method_definitions.generator_methods_not_constructable Chrome4/14/2015 Safari3/21/2016342
javascript.functions.set.computed_property_names Edge7/29/2015 Safari3/21/2016236
javascript.classes 📋Safari9/30/2015 Chrome3/2/2016154
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.classes.constructor 📋Safari9/30/2015 Chrome3/2/2016154
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.classes.extends 📋Safari9/30/2015 Chrome3/2/2016154
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.classes.static 📋Safari9/30/2015 Chrome3/2/2016154
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.

2016/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.RegExp.global.prototype_accessor Safari4/15/2005 Chrome1/20/20163932
javascript.builtins.RegExp.ignoreCase.prototype_accessor Safari4/15/2005 Chrome1/20/20163932
javascript.builtins.RegExp.multiline.prototype_accessor Safari4/15/2005 Chrome1/20/20163932
javascript.builtins.RegExp.source.prototype_accessor Safari4/15/2005 Chrome1/20/20163932

2015/12

API First Browser Date Last Browser Date Days Notes
javascript.operators.object_initializer.computed_property_names Safari10/16/2014 Chrome12/1/2015411
javascript.operators.object_initializer.shorthand_method_names Edge7/29/2015 Chrome12/1/2015125
javascript.operators.object_initializer.shorthand_property_names Edge7/29/2015 Chrome12/1/2015125

2015/11

API First Browser Date Last Browser Date Days Notes
javascript.operators.class 📋Safari10/22/2013 Edge11/12/2015751
javascript.operators.super 📋Safari10/22/2013 Edge11/12/2015751

2015/10

API First Browser Date Last Browser Date Days Notes
javascript.operators.spread 📋Safari10/16/2014 Chrome10/13/2015362
javascript.operators.spread.spread_in_arrays 📋Safari10/16/2014 Chrome10/13/2015362
javascript.operators.spread.spread_in_function_calls 📋Safari10/16/2014 Chrome10/13/2015362

2015/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.copyWithin 📋Edge7/29/2015 Safari9/30/201563
javascript.builtins.Array.from 📋Edge7/29/2015 Safari9/30/201563
javascript.builtins.Array.of 📋Edge7/29/2015 Safari9/30/201563
javascript.builtins.Map.Map.iterable_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Map.Map.null_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Map.key_equality_for_zeros Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Math.sign 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Number.EPSILON 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.MAX_SAFE_INTEGER 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.MIN_SAFE_INTEGER 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.isFinite 📋Chrome5/15/2012 Safari9/30/20151233
javascript.builtins.Number.isInteger 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.isNaN 📋Chrome2/21/2013 Safari9/30/2015951
javascript.builtins.Number.isSafeInteger 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.parseFloat 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Number.parseInt 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Object.assign 📋Edge7/29/2015 Safari9/30/201563
javascript.builtins.Object.getOwnPropertySymbols 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Object.is 📋Chrome5/15/2012 Safari9/30/20151233
javascript.builtins.Object.preventExtensions.ES2015_behavior Chrome7/21/2015 Safari9/30/201571
javascript.builtins.Object.setPrototypeOf 📋Chrome4/8/2014 Safari9/30/2015540
javascript.builtins.Set.@@iterator 📋Chrome5/19/2015 Safari9/30/2015134
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Set.Set.iterable_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Set.Set.null_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Set.key_equality_for_zeros Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.String.@@iterator 📋Chrome10/7/2014 Safari9/30/2015358
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.String.codePointAt 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.endsWith 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.fromCodePoint 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.includes 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.raw 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.repeat 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.String.startsWith 📋Chrome3/3/2015 Safari9/30/2015211
javascript.builtins.Symbol 📋Chrome10/7/2014 Safari9/30/2015358
Edge: Edge 12 included Symbol properties in JSON.stringify() output.
javascript.builtins.Symbol.Symbol 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Symbol.for 📋Chrome1/21/2015 Safari9/30/2015252
javascript.builtins.Symbol.keyFor 📋Chrome1/21/2015 Safari9/30/2015252
javascript.builtins.Symbol.toString 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Symbol.unscopables 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.Symbol.valueOf 📋Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.WeakMap.WeakMap.iterable_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.WeakSet 📋Chrome7/16/2014 Safari9/30/2015441
javascript.builtins.WeakSet.WeakSet 📋Chrome7/16/2014 Safari9/30/2015441
javascript.builtins.WeakSet.WeakSet.iterable_allowed Chrome10/7/2014 Safari9/30/2015358
javascript.builtins.WeakSet.WeakSet.null_allowed Chrome7/16/2014 Safari9/30/2015441
javascript.builtins.WeakSet.add 📋Chrome7/16/2014 Safari9/30/2015441
javascript.builtins.WeakSet.delete 📋Chrome7/16/2014 Safari9/30/2015441
javascript.builtins.WeakSet.has 📋Chrome7/16/2014 Safari9/30/2015441
javascript.functions.method_definitions 📋Chrome11/18/2014 Safari9/30/2015316
javascript.grammar.binary_numeric_literals 📋Chrome3/3/2015 Safari9/30/2015211
javascript.grammar.octal_numeric_literals 📋Chrome3/3/2015 Safari9/30/2015211
javascript.grammar.shorthand_object_literals Chrome5/19/2015 Safari9/30/2015134
javascript.grammar.template_literals 📋Chrome3/3/2015 Safari9/30/2015211
javascript.grammar.unicode_point_escapes 📋Chrome7/21/2015 Safari9/30/201571
javascript.builtins.Array.fill 📋Safari10/16/2014 Chrome9/1/2015320
javascript.builtins.Array.find 📋Safari10/16/2014 Chrome9/1/2015320
javascript.builtins.Array.findIndex 📋Safari10/16/2014 Chrome9/1/2015320

2015/7

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.Array 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.concat 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.entries 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Array.every 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.filter 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.forEach 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.indexOf 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.isArray 📋Chrome1/25/2010 Edge7/29/20152011
javascript.builtins.Array.join 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.keys 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Array.lastIndexOf 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.length 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.map 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.pop 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.push 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.reduce 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.Array.reduceRight 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.Array.reverse 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.shift 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.slice 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.some 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Array.sort 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.splice 📋Safari6/23/2003 Edge7/29/20154419
Internet Explorer: From Internet Explorer 5.5 through 8, all elements of the array will not be deleted if deleteCount is omitted. This behavior was fixed in Internet Explorer 9.
javascript.builtins.Array.toLocaleString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Array.unshift 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.ArrayBuffer 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.ArrayBuffer.ArrayBuffer 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.ArrayBuffer.byteLength 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.ArrayBuffer.isView 📋Safari10/22/2013 Edge7/29/2015645
javascript.builtins.ArrayBuffer.slice 📋Safari7/20/2011 Edge7/29/20151470
Firefox: The non-standard ArrayBuffer.slice() method has been removed in Firefox 53 (but the standardized version ArrayBuffer.prototype.slice() is kept.Firefox for Android: The non-standard ArrayBuffer.slice() method has been removed in Firefox for Android 53 (but the standardized version ArrayBuffer.prototype.slice() is kept.
javascript.builtins.Boolean 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Boolean.Boolean 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Boolean.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Boolean.valueOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.DataView 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.DataView 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.buffer 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.byteLength 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.byteOffset 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getFloat32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getFloat64 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getInt16 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getInt32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getInt8 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getUint16 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getUint32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.getUint8 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setFloat32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setFloat64 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setInt16 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setInt32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setInt8 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setUint16 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setUint32 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.DataView.setUint8 📋Chrome2/3/2011 Edge7/29/20151637
javascript.builtins.Date 📋Safari6/23/2003 Edge7/29/20154419
Internet Explorer: The ISO8601 Date Format is not supported in Internet Explorer 8 or earlier.
javascript.builtins.Date.Date 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.UTC 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getDate 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getDay 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getFullYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getHours 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getMilliseconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getMinutes 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getMonth 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getSeconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getTime 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getTimezoneOffset 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCDate 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCDay 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCFullYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCHours 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCMilliseconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCMinutes 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCMonth 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getUTCSeconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.getYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.now 📋Chrome12/11/2008 Edge7/29/20152421
javascript.builtins.Date.parse 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.parse.iso_8601 Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Date.setDate 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setFullYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setHours 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setMilliseconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setMinutes 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setMonth 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setSeconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setTime 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCDate 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCFullYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCHours 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCMilliseconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCMinutes 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCMonth 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setUTCSeconds 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.setYear 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toDateString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toGMTString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toISOString 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.Date.toJSON 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.Date.toLocaleDateString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toLocaleString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toLocaleTimeString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toTimeString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.toUTCString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Date.valueOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Error 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Error.Error 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Error.message 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Error.name 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Error.stack Chrome9/15/2009 Edge7/29/20152143
javascript.builtins.Error.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.EvalError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.EvalError.EvalError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Float32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Float32Array.Float32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Float32Array.Float32Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Float64Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Float64Array.Float64Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Float64Array.Float64Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Function 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Function.Function 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Function.apply 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Function.apply.generic_arrays_as_arguments Chrome2/8/2012 Edge7/29/20151267
javascript.builtins.Function.arguments Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Function.bind 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Function.call 📋Safari6/23/2003 Edge7/29/20154419
Node.js: When calling this method, thisArg does not default to the global object.
javascript.builtins.Function.caller Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Function.length 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Function.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Infinity 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Int16Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int16Array.Int16Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int16Array.Int16Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int32Array.Int32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int32Array.Int32Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int8Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int8Array.Int8Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Int8Array.Int8Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.JSON 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.JSON.parse 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.JSON.stringify 📋Safari6/8/2009 Edge7/29/20152242
javascript.builtins.Map 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.Map 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.clear 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.delete 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.entries 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.forEach 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.get 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.has 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.keys 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Map.set 📋Chrome10/7/2014 Edge7/29/2015295
Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.Map.size 📋Chrome10/7/2014 Edge7/29/2015295
Firefox: From Firefox 13 to Firefox 18, the size property was implemented as a Map.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.Firefox for Android: From Firefox for Android 14 to Firefox for Android 18, the size property was implemented as a Map.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.
javascript.builtins.Map.values 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.E 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.LN10 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.LN2 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.LOG10E 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.LOG2E 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.PI 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.SQRT1_2 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.SQRT2 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.abs 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.acos 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.acosh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.asin 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.asinh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.atan 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.atan2 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.atanh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.cbrt 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.ceil 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.clz32 📋Safari10/22/2013 Edge7/29/2015645
javascript.builtins.Math.cos 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.cosh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.exp 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.expm1 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.floor 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.fround 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.hypot 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.imul 📋Chrome7/9/2013 Edge7/29/2015750
javascript.builtins.Math.log 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.log10 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.log1p 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.log2 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.max 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.min 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.pow 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.random 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.round 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.sin 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.sinh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.sqrt 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.tan 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Math.tanh 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Math.trunc 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.NaN 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.MAX_VALUE 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.MIN_VALUE 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.NEGATIVE_INFINITY 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.NaN 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.Number 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.POSITIVE_INFINITY 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.toExponential 📋Safari4/29/2005 Edge7/29/20153743
javascript.builtins.Number.toFixed 📋Safari4/29/2005 Edge7/29/20153743
javascript.builtins.Number.toLocaleString 📋Safari6/23/2003 Edge7/29/20154419
Edge: Before Edge 18, numbers are rounded to 15 decimal digits. For example, (1000000000000005).toLocaleString('en-US') returns "1,000,000,000,000,010".Internet Explorer: In Internet Explorer 11, numbers are rounded to 15 decimal digits. For example, (1000000000000005).toLocaleString('en-US') returns "1,000,000,000,000,010".
javascript.builtins.Number.toPrecision 📋Safari4/29/2005 Edge7/29/20153743
javascript.builtins.Number.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Number.valueOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object.Object 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object.constructor 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object.create 📋Chrome5/25/2010 Edge7/29/20151891
javascript.builtins.Object.defineGetter 📋Safari10/26/2007 Edge7/29/20152833
Firefox: Starting with Firefox 48, this method can no longer be called at the global scope without any object. A TypeError will be thrown otherwise. Previously, the global object was used in these cases automatically, but this is no longer the case.
javascript.builtins.Object.defineProperties 📋Chrome5/25/2010 Edge7/29/20151891
javascript.builtins.Object.defineProperty 📋Chrome5/25/2010 Edge7/29/20151891
Internet Explorer: In Internet Explorer 8, this was only supported on DOM objects and with some non-standard behaviors. This was later fixed in Internet Explorer 9.Safari: Also supported in Safari 5, but not on DOM objects.Safari on iOS: Also supported in Safari for iOS 4.2, but not on DOM objects.WebView on iOS: Also supported in Safari for iOS 4.2, but not on DOM objects.
javascript.builtins.Object.defineSetter 📋Safari10/26/2007 Edge7/29/20152833
Firefox: Starting with Firefox 48, this method can no longer be called at the global scope without any object. A TypeError will be thrown otherwise. Previously, the global object was used in these cases automatically, but this is no longer the case.
javascript.builtins.Object.freeze 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.getOwnPropertyDescriptor 📋Chrome5/25/2010 Edge7/29/20151891
Internet Explorer: In Internet Explorer 8, this was only supported on DOM objects and with some non-standard behaviors. This was later fixed in Internet Explorer 9.
javascript.builtins.Object.getOwnPropertyNames 📋Chrome5/25/2010 Edge7/29/20151891
javascript.builtins.Object.getPrototypeOf 📋Chrome5/25/2010 Edge7/29/20151891
javascript.builtins.Object.hasOwnProperty 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.isExtensible 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.isFrozen 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.isPrototypeOf 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.isSealed 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.keys 📋Chrome5/25/2010 Edge7/29/20151891
javascript.builtins.Object.lookupGetter 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.lookupSetter 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.preventExtensions 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.propertyIsEnumerable 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.proto 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.Object.seal 📋Chrome9/2/2010 Edge7/29/20151791
javascript.builtins.Object.toLocaleString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Object.valueOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Promise 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.Promise 📋Chrome1/14/2014 Edge7/29/2015561
Firefox: Constructor requires a new operator since version 37.Firefox for Android: Constructor requires a new operator since version 37.Node.js: Constructor requires a new operator since version 4.Safari: Constructor requires a new operator since version 10.Safari on iOS: Constructor requires a new operator since version 10.WebView on iOS: Constructor requires a new operator since version 10.
javascript.builtins.Promise.all 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.catch 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.race 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.reject 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.resolve 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.Promise.then 📋Chrome1/14/2014 Edge7/29/2015561
javascript.builtins.RangeError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RangeError.RangeError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.ReferenceError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.ReferenceError.ReferenceError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.RegExp 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.compile 📋Safari3/18/2008 Edge7/29/20152689
javascript.builtins.RegExp.exec 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.global 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.ignoreCase 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.input 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.RegExp.lastIndex 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.lastMatch 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.RegExp.lastParen 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.RegExp.leftContext 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.RegExp.multiline 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.n 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.rightContext 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.RegExp.source 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.source.empty_regex_string Safari6/7/2010 Edge7/29/20151878
javascript.builtins.RegExp.test 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.RegExp.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Set 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.Set 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.add 📋Chrome10/7/2014 Edge7/29/2015295
Internet Explorer: Returns 'undefined' instead of the 'Set' object.
javascript.builtins.Set.clear 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.delete 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.entries 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.forEach 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.has 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.keys 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.Set.size 📋Chrome10/7/2014 Edge7/29/2015295
Firefox: From Firefox 13 to Firefox 18, the size property was implemented as a Set.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.Firefox for Android: From Firefox for Android 14 to Firefox for Android 18, the size property was implemented as a Set.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.
javascript.builtins.Set.values 📋Chrome10/7/2014 Edge7/29/2015295
javascript.builtins.String 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.String 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.anchor 📋Safari6/23/2003 Edge7/29/20154419
Firefox: Starting with version 17, the quotation mark (") is replaced by its HTML reference character (") in strings supplied for the name parameter.
javascript.builtins.String.big 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.blink 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.bold 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.charAt 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.charCodeAt 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.concat 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.fixed 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.fontcolor 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.fontsize 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.fromCharCode 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.indexOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.italics 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.lastIndexOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.length 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.link 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.localeCompare 📋Safari10/26/2007 Edge7/29/20152833
javascript.builtins.String.match 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.replace 📋Safari6/23/2003 Edge7/29/20154419
Internet Explorer: A replacement function as second argument is not supported.
javascript.builtins.String.search 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.slice 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.small 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.split 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.strike 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.sub 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.substr 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.substring 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.sup 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.toLocaleLowerCase 📋Safari4/15/2005 Edge7/29/20153757
javascript.builtins.String.toLocaleUpperCase 📋Safari4/15/2005 Edge7/29/20153757
javascript.builtins.String.toLowerCase 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.toString 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.toUpperCase 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.trim 📋Chrome1/25/2010 Edge7/29/20152011
javascript.builtins.String.unicode_code_point_escapes Safari6/23/2003 Edge7/29/20154419
javascript.builtins.String.valueOf 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.SyntaxError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.SyntaxError.SyntaxError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.TypeError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.TypeError.TypeError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.TypedArray 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.BYTES_PER_ELEMENT 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.buffer 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.byteLength 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.byteOffset 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.index_properties_not_consulting_prototype Chrome10/19/2010 Edge7/29/20151744
Chrome: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Chrome Android: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Deno: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Edge: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Internet Explorer: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Node.js: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Quest Browser: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Opera: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Opera Android: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Safari: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Safari on iOS: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.Samsung Internet: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.WebView Android: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.WebView on iOS: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.
javascript.builtins.TypedArray.length 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.name 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.named_properties Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.set 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.subarray 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.toLocaleString 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.TypedArray.toString 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.URIError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.URIError.URIError 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.Uint16Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint16Array.Uint16Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint16Array.Uint16Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint32Array.Uint32Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint32Array.Uint32Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8Array.Uint8Array 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8Array.Uint8Array.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8ClampedArray 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray 📋Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.constructor_without_parameters Chrome10/19/2010 Edge7/29/20151744
javascript.builtins.WeakMap 📋Chrome7/16/2014 Edge7/29/2015378
javascript.builtins.WeakMap.WeakMap 📋Chrome7/16/2014 Edge7/29/2015378
javascript.builtins.WeakMap.WeakMap.null_allowed Chrome7/16/2014 Edge7/29/2015378
javascript.builtins.WeakMap.delete 📋Chrome7/16/2014 Edge7/29/2015378
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.get 📋Chrome7/16/2014 Edge7/29/2015378
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.
javascript.builtins.WeakMap.has 📋Chrome7/16/2014 Edge7/29/2015378
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.set 📋Chrome7/16/2014 Edge7/29/2015378
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.decodeURI 📋Safari10/24/2003 Edge7/29/20154296
javascript.builtins.decodeURIComponent 📋Safari10/24/2003 Edge7/29/20154296
javascript.builtins.encodeURI 📋Safari10/24/2003 Edge7/29/20154296
javascript.builtins.encodeURIComponent 📋Safari10/24/2003 Edge7/29/20154296
javascript.builtins.escape 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.eval 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.isFinite 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.isNaN 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.parseFloat 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.parseInt 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.parseInt.leading_zero_strings_as_decimal Safari7/25/2012 Edge7/29/20151099
javascript.builtins.undefined 📋Safari6/23/2003 Edge7/29/20154419
javascript.builtins.unescape 📋Safari6/23/2003 Edge7/29/20154419
javascript.functions 📋Safari6/23/2003 Edge7/29/20154419
javascript.functions.arguments 📋Safari6/23/2003 Edge7/29/20154419
javascript.functions.arguments.callee 📋Safari6/23/2003 Edge7/29/20154419
javascript.functions.arguments.length 📋Safari6/23/2003 Edge7/29/20154419
javascript.functions.get 📋Safari10/26/2007 Edge7/29/20152833
javascript.functions.set 📋Safari10/26/2007 Edge7/29/20152833
javascript.grammar.array_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.boolean_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.decimal_numeric_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.hexadecimal_escape_sequences 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.hexadecimal_numeric_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.null_literal 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.regular_expression_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.string_literals 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.trailing_commas 📋Safari6/23/2003 Edge7/29/20154419
javascript.grammar.trailing_commas.trailing_commas_in_object_literals Safari10/26/2007 Edge7/29/20152833
javascript.grammar.unicode_escape_sequences 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.addition 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.addition_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_and 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_and_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_not 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_or 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_or_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_xor 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.bitwise_xor_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.comma 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.conditional 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.decrement 📋Chrome5/21/2009 Edge7/29/20152260
javascript.operators.delete 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.division 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.division_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.equality 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.function 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.greater_than 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.greater_than_or_equal 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.grouping 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.in 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.increment 📋Chrome5/21/2009 Edge7/29/20152260
javascript.operators.inequality 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.instanceof 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.left_shift 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.left_shift_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.less_than 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.less_than_or_equal 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.logical_and 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.logical_not 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.logical_or 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.multiplication 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.multiplication_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.new 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.null 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.object_initializer 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.property_accessors 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.remainder 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.remainder_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.right_shift 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.right_shift_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.strict_equality 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.strict_inequality 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.subtraction 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.subtraction_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.this 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.typeof 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.unary_negation 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.unary_plus 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.unsigned_right_shift 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.unsigned_right_shift_assignment 📋Safari6/23/2003 Edge7/29/20154419
javascript.operators.void 📋Safari3/18/2008 Edge7/29/20152689
javascript.regular_expressions.backreference 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.capturing_group 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.character_class 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.character_class_escape 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.character_escape 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.disjunction 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.input_boundary_assertion 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.literal_character 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.lookahead_assertion 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.non_capturing_group 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.quantifier 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.wildcard 📋Safari6/23/2003 Edge7/29/20154419
javascript.regular_expressions.word_boundary_assertion 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.block 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.break 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.const 📋Safari7/20/2011 Edge7/29/20151470
Firefox: Before Firefox 13, const is implemented, but re-assignment is not failing.Firefox: Before Firefox 46, a TypeError was thrown on redeclaration instead of a SyntaxError.Firefox for Android: Before Firefox for Android 14, const is implemented, but re-assignment is not failing.Firefox for Android: Before Firefox for Android 46, a TypeError was thrown on redeclaration instead of a SyntaxError.
javascript.statements.continue 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.debugger 📋Chrome5/25/2010 Edge7/29/20151891
javascript.statements.do_while 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.empty 📋Chrome9/15/2009 Edge7/29/20152143
javascript.statements.for 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.for_in 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.for_of 📋Safari10/22/2013 Edge7/29/2015645
Firefox: Before Firefox 51, using the for...of loop construct with the const keyword threw a SyntaxError ("missing = in const declaration").Firefox for Android: Before Firefox for Android 51, using the for...of loop construct with the const keyword threw a SyntaxError ("missing = in const declaration").
javascript.statements.function 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.if_else 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.label 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.return 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.switch 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.throw 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.try_catch 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.var 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.while 📋Safari6/23/2003 Edge7/29/20154419
javascript.statements.with 📋Safari6/23/2003 Edge7/29/20154419