Time to Stable

For a given set of browsers, what APIs are in all of them and how many days it take for the API to land in the first browser to the last.

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs that landed in A first and B last.
Last in ChromeLast in Firefox
First in Chrome 519
First in Firefox 823

Average time for an API to become available across Chrome and Firefox

1342 APIs took an average of 644.68 days to become available to use.

API breakdown:

Average time to landing by year of first landing

If a feature landed in the earliest browser in 20XX it took Y days on average to become available in the last browser (when considering Chrome and Firefox). TTA (time to available).
JS APIsJS TTA
2004 3171502.50
2005 91108.00
2008 51986.40
2009 61079.00
2010 60699.75
2011 29653.17
2012 28766.32
2013 112611.10
2014 77319.62
2015 70200.40
2016 47160.45
2017 42199.19
2018 61408.61
2019 50448.00
2020 37409.08
2021 25307.96
2022 18268.94
2023 33385.64
2024 45227.58
2025 270218.84
2026 156.00

The Tortoise and the Hare

There is a natural tension on the web with respect to browser engines. Every engine has their own set of priorities which define the level of investment that they choose to make and on which areas they choose to make it.

A developer naturally wants their experiences to be available to the widest audience possible and these differing priorities create an unevenness on the platform (a lumpiness) making it harder for developers to build experiences that work everywhere.

This section highlights where browsers are pushing and pulling on the platform.

Sprinters

This table is designed to show which browsers are pushing on the platform the most.

Adding features to quickly is not always desired because developers are unlikely to adopt those features in their sites or apps.

For a given year, if a feature landed in Browser X first, how many days it take on average to be available in Chrome and Firefox. TTA (time to available).
Year JSJS TTA
2004
  Firefox 3171502.50
2005
  Firefox 91108.00
2008
  Firefox 41874.50
  Chrome 12434.00
2009
  Chrome 15705.00
  Firefox 5153.80
2010
  Chrome 60699.75
2011
  Chrome 21572.00
  Firefox 8866.25
2012
  Chrome 5351.20
  Firefox 23856.57
2013
  Firefox 58572.31
  Chrome 54652.76
2014
  Chrome 51310.22
  Firefox 26338.08
2015
  Chrome 13122.08
  Firefox 57218.26
2016
  Chrome 39169.77
  Firefox 8115.00
2017
  Firefox 25182.84
  Chrome 17223.24
2018
  Chrome 57425.25
  Firefox 4171.50
2019
  Chrome 50448.00
2020
  Firefox 934.22
  Chrome 28529.57
2021
  Firefox 1483.50
  Chrome 11593.64
2022
  Chrome 18268.94
2023
  Firefox 2122.50
  Chrome 31402.61
2024
  Firefox 11260.91
  Chrome 34216.79
2025
  Chrome 28134.00
  Firefox 242228.66
2026
  Firefox 156.00

Plodders

This table is designed to show which browsers are pulling on the platform the most.

For a feature that first landed in year X, how many days did it take on average for the last browser to catch up across Chrome and Firefox. TTA (time to available).
Year JS countJS TTA
2004
  Chrome 3171502.50
2005
  Chrome 91108.00
2008
  Chrome 41874.50
  Firefox 12434.00
2009
  Firefox 15705.00
  Chrome 5153.80
2010
  Firefox 60699.75
2011
  Firefox 21572.00
  Chrome 8866.25
2012
  Firefox 5351.20
  Chrome 23856.57
2013
  Chrome 58572.31
  Firefox 54652.76
2014
  Firefox 51310.22
  Chrome 26338.08
2015
  Firefox 13122.08
  Chrome 57218.26
2016
  Firefox 39169.77
  Chrome 8115.00
2017
  Chrome 25182.84
  Firefox 17223.24
2018
  Firefox 57425.25
  Chrome 4171.50
2019
  Firefox 50448.00
2020
  Chrome 934.22
  Firefox 28529.57
2021
  Chrome 1483.50
  Firefox 11593.64
2022
  Firefox 18268.94
2023
  Chrome 2122.50
  Firefox 31402.61
2024
  Chrome 11260.91
  Firefox 34216.79
2025
  Firefox 28134.00
  Chrome 242228.66
2026
  Chrome 156.00

Stable APIs

Below is a list of features that are in Chrome and Firefox

Raw Data

Quick Links:

JS Data

API First Browser Date Last Browser Date Days Notes
javascript.builtins.AggregateError 📋Firefox7/28/2020 Chrome8/25/202028
javascript.builtins.AggregateError.AggregateError 📋Firefox7/28/2020 Chrome8/25/202028
javascript.builtins.AggregateError.errors 📋Firefox7/28/2020 Chrome8/25/202028
javascript.builtins.AggregateError.serializable_object Chrome2/1/2022 Firefox7/26/2022175
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.Array 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.@@iterator 📋Chrome10/7/2014 Firefox2/24/2015140
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.@@species 📋Chrome5/25/2016 Firefox8/2/201669
javascript.builtins.Array.@@unscopables 📋Chrome10/7/2014 Firefox8/2/2016665
javascript.builtins.Array.Array 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.at 📋Firefox7/13/2021 Chrome7/20/20217
javascript.builtins.Array.concat 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.copyWithin 📋Firefox9/2/2014 Chrome9/1/2015364
javascript.builtins.Array.entries 📋Firefox3/18/2014 Chrome10/7/2014203
javascript.builtins.Array.every 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.fill 📋Firefox7/22/2014 Chrome9/1/2015406
javascript.builtins.Array.filter 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.find 📋Firefox10/29/2013 Chrome9/1/2015672
javascript.builtins.Array.findIndex 📋Firefox10/29/2013 Chrome9/1/2015672
javascript.builtins.Array.findLast 📋Chrome1/4/2022 Firefox8/23/2022231
javascript.builtins.Array.findLastIndex 📋Chrome1/4/2022 Firefox8/23/2022231
javascript.builtins.Array.flat 📋Chrome9/4/2018 Firefox9/5/20181
javascript.builtins.Array.flatMap 📋Chrome9/4/2018 Firefox9/5/20181
javascript.builtins.Array.forEach 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.from 📋Firefox9/2/2014 Chrome9/1/2015364
javascript.builtins.Array.fromAsync 📋Firefox7/4/2023 Chrome1/23/2024203
javascript.builtins.Array.includes 📋Chrome12/1/2015 Firefox12/15/201514
javascript.builtins.Array.indexOf 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.isArray 📋Chrome1/25/2010 Firefox3/22/2011421
javascript.builtins.Array.join 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.keys 📋Firefox3/18/2014 Chrome10/7/2014203
javascript.builtins.Array.lastIndexOf 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.length 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.map 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.of 📋Firefox10/29/2013 Chrome9/1/2015672
javascript.builtins.Array.pop 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.push 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.reduce 📋Firefox6/17/2008 Chrome9/15/2009455
javascript.builtins.Array.reduceRight 📋Firefox6/17/2008 Chrome9/15/2009455
javascript.builtins.Array.reverse 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.shift 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.slice 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.some 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.builtins.Array.sort 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.sort.stable_sorting Firefox6/17/2008 Chrome10/16/20183773
javascript.builtins.Array.splice 📋Firefox11/9/2004 Chrome12/11/20081493
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 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.toLocaleString.locales_parameter Chrome1/10/2013 Firefox3/7/20171517
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 Firefox3/7/20171517
javascript.builtins.Array.toReversed 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toSorted 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toSpliced 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.unshift 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Array.values 📋Chrome4/17/2018 Firefox5/9/201822
javascript.builtins.Array.with 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.ArrayBuffer 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.ArrayBuffer.@@species 📋Chrome5/25/2016 Firefox8/2/201669
javascript.builtins.ArrayBuffer.ArrayBuffer 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.ArrayBuffer.ArrayBuffer.maxByteLength_option 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.byteLength 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.ArrayBuffer.detached 📋Chrome5/30/2023 Firefox1/23/2024238
javascript.builtins.ArrayBuffer.isView 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.ArrayBuffer.maxByteLength 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.resizable 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.resize 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.slice 📋Chrome2/8/2012 Firefox4/24/201276
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.ArrayBuffer.transfer 📋Chrome5/30/2023 Firefox1/23/2024238
javascript.builtins.ArrayBuffer.transferToFixedLength 📋Chrome5/30/2023 Firefox1/23/2024238
javascript.builtins.AsyncDisposableStack 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.@@asyncDispose 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.AsyncDisposableStack 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.adopt 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.defer 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.disposeAsync 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.disposed 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.move 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.use 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncFunction 📋Chrome12/1/2016 Firefox3/7/201796
javascript.builtins.AsyncFunction.AsyncFunction 📋Chrome12/1/2016 Firefox3/7/201796
javascript.builtins.AsyncGenerator 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncGenerator.next 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncGenerator.return 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncGenerator.throw 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncGeneratorFunction 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncGeneratorFunction.AsyncGeneratorFunction 📋Firefox8/8/2017 Chrome12/6/2017120
javascript.builtins.AsyncIterator 📋Firefox11/14/2017 Chrome12/6/201722
javascript.builtins.AsyncIterator.@@asyncDispose 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncIterator.@@asyncIterator 📋Firefox11/14/2017 Chrome12/6/201722
javascript.builtins.Atomics 📋Chrome7/24/2018 Firefox6/30/2020707
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 Firefox6/30/2020707
javascript.builtins.Atomics.and 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.compareExchange 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.exchange 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.isLockFree 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.load 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.notify 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.or 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.pause 📋Chrome2/4/2025 Firefox4/1/202556
javascript.builtins.Atomics.store 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.sub 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.wait 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.Atomics.waitAsync 📋Chrome4/13/2021 Firefox11/11/20251673
Chrome: The Atomics.waitAsync() method never times out. See bug 40742782.Chrome Android: The Atomics.waitAsync() method never times out. See bug 40742782.Edge: The Atomics.waitAsync() method never times out. See bug 40742782.Quest Browser: The Atomics.waitAsync() method never times out. See bug 40742782.Opera Android: The Atomics.waitAsync() method never times out. See bug 40742782.WebView Android: The Atomics.waitAsync() method never times out. See bug 40742782.
javascript.builtins.Atomics.xor 📋Chrome7/24/2018 Firefox6/30/2020707
javascript.builtins.BigInt 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.BigInt 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.asIntN 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.asUintN 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.toLocaleString 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.toLocaleString.locales_parameter Chrome7/30/2019 Firefox10/22/201984
Deno: Only the locale data for en-US is available.
javascript.builtins.BigInt.toLocaleString.options_parameter Chrome7/30/2019 Firefox10/22/201984
javascript.builtins.BigInt.toString 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt.valueOf 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt64Array 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigInt64Array.BigInt64Array 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigUint64Array 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.BigUint64Array.BigUint64Array 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.Boolean 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Boolean.Boolean 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Boolean.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Boolean.valueOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.DataView 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.DataView 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.DataView.sharedarraybuffer_support Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.DataView.buffer 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.byteLength 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.byteOffset 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getBigInt64 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.DataView.getBigUint64 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.DataView.getFloat16 📋Firefox8/6/2024 Chrome4/1/2025238
javascript.builtins.DataView.getFloat32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getFloat64 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getInt16 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getInt32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getInt8 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getUint16 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getUint32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.getUint8 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setBigInt64 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.DataView.setBigUint64 📋Chrome5/29/2018 Firefox7/9/2019406
javascript.builtins.DataView.setFloat16 📋Firefox8/6/2024 Chrome4/1/2025238
javascript.builtins.DataView.setFloat32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setFloat64 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setInt16 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setInt32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setInt8 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setUint16 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setUint32 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.DataView.setUint8 📋Chrome2/3/2011 Firefox8/28/2012572
javascript.builtins.Date 📋Firefox11/9/2004 Chrome12/11/20081493
Internet Explorer: The ISO8601 Date Format is not supported in Internet Explorer 8 or earlier.
javascript.builtins.Date.@@toPrimitive 📋Chrome12/1/2015 Firefox1/26/201656
javascript.builtins.Date.Date 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.UTC 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.UTC.optional_monthIndex Firefox3/22/2011 Chrome10/25/2011217
javascript.builtins.Date.getDate 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getDay 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getFullYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getHours 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getMilliseconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getMinutes 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getMonth 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getSeconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getTime 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getTimezoneOffset 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCDate 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCDay 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCFullYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCHours 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCMilliseconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCMinutes 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCMonth 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getUTCSeconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.getYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.now 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.parse 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.parse.iso_8601 Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Date.setDate 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setFullYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setHours 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setMilliseconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setMinutes 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setMonth 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setSeconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setTime 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCDate 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCFullYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCHours 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCMilliseconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCMinutes 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCMonth 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setUTCSeconds 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.setYear 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toDateString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toGMTString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toISOString 📋Firefox11/9/2004 Chrome9/15/20091771
javascript.builtins.Date.toJSON 📋Firefox11/9/2004 Chrome9/15/20091771
javascript.builtins.Date.toLocaleDateString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toLocaleDateString.iana_time_zone_names Chrome1/10/2013 Firefox3/7/20171517
javascript.builtins.Date.toLocaleDateString.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Date.toLocaleString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toLocaleString.iana_time_zone_names Chrome1/10/2013 Firefox3/7/20171517
javascript.builtins.Date.toLocaleString.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Date.toLocaleTimeString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toLocaleTimeString.iana_time_zone_names Chrome1/10/2013 Firefox3/7/20171517
javascript.builtins.Date.toLocaleTimeString.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Date.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toTemporalInstant 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Date.toTimeString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.toUTCString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Date.valueOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.DisposableStack 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.@@dispose 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.DisposableStack 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.adopt 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.defer 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.dispose 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.disposed 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.move 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.use 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.Error 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Error.Error 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Error.Error.options_cause_parameter 📋Firefox8/10/2021 Chrome8/31/202121
javascript.builtins.Error.captureStackTrace 📋Chrome9/15/2009 Firefox4/29/20255705
javascript.builtins.Error.cause 📋Firefox8/10/2021 Chrome8/31/202121
Chrome: Before version 125, default console logging for Error objects does not print the cause.Chrome Android: Before version 125, default console logging for Error objects does not print the cause.Edge: Before version 125, default console logging for Error objects does not print the cause.Quest Browser: Before version false, default console logging for Error objects does not print the cause.Opera: Before version 111, default console logging for Error objects does not print the cause.Opera Android: Before version 83, default console logging for Error objects does not print the cause.Safari: Default console logging for Error objects does not print the cause.Safari on iOS: Default console logging for Error objects does not print the cause.Samsung Internet: Before version 27.0, default console logging for Error objects does not print the cause.WebView Android: Before version 125, default console logging for Error objects does not print the cause.WebView on iOS: Default console logging for Error objects does not print the cause.
javascript.builtins.Error.isError 📋Chrome3/4/2025 Firefox4/29/202556
Node.js: Returns false for DOMException instances. See issue 56497.Safari: Returns false for DOMException instances.Safari on iOS: Returns false for DOMException instances.WebView on iOS: Returns false for DOMException instances.
javascript.builtins.Error.message 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Error.name 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Error.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Error.stack Firefox11/9/2004 Chrome9/15/20091771
javascript.builtins.Error.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.EvalError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.EvalError.EvalError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.EvalError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.FinalizationRegistry 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.FinalizationRegistry 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.register 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.register.symbol_as_target Chrome1/10/2023 Firefox12/9/20251064
javascript.builtins.FinalizationRegistry.unregister 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.Float16Array 📋Firefox8/6/2024 Chrome4/1/2025238
javascript.builtins.Float16Array.Float16Array 📋Firefox8/6/2024 Chrome4/1/2025238
javascript.builtins.Float32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Float32Array.Float32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Float32Array.Float32Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Float32Array.Float32Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Float64Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Float64Array.Float64Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Float64Array.Float64Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Float64Array.Float64Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Function 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.@@hasInstance 📋Chrome4/13/2016 Firefox11/15/2016216
javascript.builtins.Function.Function 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.apply 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.apply.generic_arrays_as_arguments Firefox3/22/2011 Chrome2/8/2012323
javascript.builtins.Function.arguments Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.bind 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Function.call 📋Firefox11/9/2004 Chrome12/11/20081493
Node.js: When calling this method, thisArg does not default to the global object.
javascript.builtins.Function.caller Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.length 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.length.configurable_true Firefox3/31/2015 Chrome5/19/201549
javascript.builtins.Function.name 📋Firefox11/9/2004 Chrome10/25/20112541
javascript.builtins.Function.name.configurable_true Firefox5/12/2015 Chrome5/19/20157
javascript.builtins.Function.name.inferred_names Chrome5/25/2016 Firefox4/19/2017329
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.Function.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Function.toString.toString_revision Firefox6/13/2017 Chrome4/17/2018308
javascript.builtins.Generator 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.builtins.Generator.next 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.builtins.Generator.return 📋Firefox5/12/2015 Chrome4/13/2016337
javascript.builtins.Generator.throw 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.builtins.GeneratorFunction 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.builtins.GeneratorFunction.GeneratorFunction 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.builtins.Infinity 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Int16Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int16Array.Int16Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int16Array.Int16Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Int16Array.Int16Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Int32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int32Array.Int32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int32Array.Int32Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Int32Array.Int32Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Int8Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int8Array.Int8Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Int8Array.Int8Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Int8Array.Int8Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Intl 📋Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator 📋Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
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.Collator.options_caseFirst_parameter Chrome1/10/2013 Firefox8/8/20171671
javascript.builtins.Intl.Collator.Collator.options_collation_parameter Chrome10/20/2020 Firefox1/26/202198
javascript.builtins.Intl.Collator.Collator.options_ignorePunctuation_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator.Collator.options_localeMatcher_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator.Collator.options_numeric_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator.Collator.options_sensitivity_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator.Collator.options_usage_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.Collator.compare 📋Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
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 Firefox4/29/2014474
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 Firefox4/29/2014474
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 Firefox4/29/2014474
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.IntlLegacyConstructedSymbol 📋Firefox6/13/2017 Chrome5/25/20211442
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.DateTimeFormat.DateTimeFormat.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter Chrome2/4/2020 Firefox5/5/202091
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter Chrome7/30/2019 Firefox7/28/2020364
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter Firefox7/13/2021 Chrome7/20/20217
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter Chrome7/27/2020 Firefox12/15/2020141
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter Firefox1/23/2018 Chrome3/12/2019413
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter Chrome2/4/2020 Firefox5/5/202091
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter Chrome7/30/2019 Firefox7/28/2020364
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values Firefox8/10/2021 Chrome10/19/202170
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones Chrome1/10/2013 Firefox3/7/20171517
javascript.builtins.Intl.DateTimeFormat.format 📋Chrome1/10/2013 Firefox4/29/2014474
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.formatRange 📋Chrome7/30/2019 Firefox8/10/2021742
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 Firefox8/10/2021742
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.formatToParts 📋Firefox1/24/2017 Chrome3/9/201744
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.Intl.DateTimeFormat.resolvedOptions 📋Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/19/20171065
javascript.builtins.Intl.DateTimeFormat.supportedLocalesOf 📋Chrome1/10/2013 Firefox4/29/2014474
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.DisplayNames 📋Chrome4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.DisplayNames 📋Chrome4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.of 📋Chrome4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.resolvedOptions 📋Chrome4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.supportedLocalesOf 📋Chrome4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DurationFormat 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.DurationFormat 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.format 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.formatToParts 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.resolvedOptions 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋Chrome9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.ListFormat 📋Chrome1/29/2019 Firefox6/30/2020518
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 Firefox6/30/2020518
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 Firefox6/30/2020518
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 Firefox6/30/2020518
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 Firefox6/30/2020518
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 Firefox6/30/2020518
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.Locale 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.Locale 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.baseName 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.calendar 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.caseFirst 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.collation 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.hourCycle 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.language 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.maximize 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.minimize 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.numberingSystem 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.numeric 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.region 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.script 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.Locale.toString 📋Chrome4/23/2019 Firefox4/7/2020350
javascript.builtins.Intl.NumberFormat 📋Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol 📋Firefox6/13/2017 Chrome5/25/20211442
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.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter Chrome9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter Firefox11/3/2015 Chrome9/10/20191407
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 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter Chrome9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter Chrome1/10/2013 Firefox5/5/20202672
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter Chrome9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter Chrome1/10/2013 Firefox4/29/2014474
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter Chrome9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter Chrome9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter Chrome1/10/2013 Firefox4/29/2014474
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.options_useGrouping_parameter.string_values Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.format 📋Chrome1/10/2013 Firefox4/29/2014474
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.format.number_parameter-string_decimal Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatRange 📋Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatRangeToParts 📋Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatToParts 📋Chrome1/23/2018 Firefox1/23/2018
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 Firefox4/29/2014474
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 Firefox4/29/2014474
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.PluralRules 📋Chrome12/6/2017 Firefox1/23/201848
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 Firefox1/23/201848
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.PluralRules.options_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingMode_parameter Firefox8/1/2023 Chrome9/12/202342
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingPriority_parameter Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.resolvedOptions 📋Chrome12/6/2017 Firefox1/23/201848
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 Firefox1/23/201848
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.selectRange 📋Chrome9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.supportedLocalesOf 📋Chrome12/6/2017 Firefox1/23/201848
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.RelativeTimeFormat 📋Chrome12/4/2018 Firefox1/29/201956
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 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.locales_parameter Chrome12/4/2018 Firefox1/29/201956
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 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numberingSystem_parameter Chrome12/4/2018 Firefox5/5/2020518
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numeric_parameter Chrome12/4/2018 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.format 📋Chrome12/4/2018 Firefox1/29/201956
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 Firefox10/22/2019322
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 Firefox1/29/201956
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 Firefox1/29/201956
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.Segmenter 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.Segmenter 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.resolvedOptions 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.segment 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.supportedLocalesOf 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments.@@iterator 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments.containing 📋Chrome11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.getCanonicalLocales 📋Firefox8/2/2016 Chrome10/12/201671
javascript.builtins.Intl.supportedValuesOf 📋Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_calendar Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_collation Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_currency Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_numberingSystem Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_timeZone Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_unit Firefox10/5/2021 Chrome3/1/2022147
javascript.builtins.Iterator 📋Firefox11/20/2012 Chrome10/7/2014686
javascript.builtins.Iterator.@@dispose 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.Iterator.@@iterator 📋Chrome10/7/2014 Firefox2/24/2015140
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.Iterator.Iterator 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.concat 📋Firefox1/13/2026 Chrome3/10/202656
javascript.builtins.Iterator.drop 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.every 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.filter 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.find 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.flatMap 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.forEach 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.from 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.map 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.reduce 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.some 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.take 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.toArray 📋Chrome2/20/2024 Firefox10/1/2024224
javascript.builtins.JSON 📋Firefox6/30/2009 Chrome9/15/200977
javascript.builtins.JSON.isRawJSON 📋Chrome5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.json_superset Chrome4/17/2018 Firefox9/5/2018141
javascript.builtins.JSON.parse 📋Firefox6/30/2009 Chrome9/15/200977
javascript.builtins.JSON.parse.reviver_parameter_context_argument 📋Chrome5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.rawJSON 📋Chrome5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.stringify 📋Firefox6/30/2009 Chrome9/15/200977
javascript.builtins.JSON.stringify.well_formed_stringify Firefox12/11/2018 Chrome1/29/201949
javascript.builtins.Map 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.@@iterator 📋Chrome10/7/2014 Firefox2/24/2015140
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 📋Firefox9/22/2015 Chrome5/25/2016246
javascript.builtins.Map.Map 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.Map.iterable_allowed Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.Map.null_allowed Chrome10/7/2014 Firefox3/31/2015175
javascript.builtins.Map.clear 📋Firefox2/19/2013 Chrome10/7/2014595
javascript.builtins.Map.delete 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.entries 📋Firefox4/2/2013 Chrome10/7/2014553
javascript.builtins.Map.forEach 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Map.get 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.getOrInsert 📋Firefox10/14/2025 Chrome2/10/2026119
javascript.builtins.Map.getOrInsertComputed 📋Firefox10/14/2025 Chrome2/10/2026119
javascript.builtins.Map.groupBy 📋Chrome9/12/2023 Firefox10/24/202342
javascript.builtins.Map.has 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Map.key_equality_for_zeros Firefox4/29/2014 Chrome10/7/2014161
javascript.builtins.Map.keys 📋Firefox4/2/2013 Chrome10/7/2014553
javascript.builtins.Map.set 📋Firefox6/5/2012 Chrome10/7/2014854
Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.Map.size 📋Firefox2/19/2013 Chrome10/7/2014595
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 📋Firefox4/2/2013 Chrome10/7/2014553
javascript.builtins.Math 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.E 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.LN10 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.LN2 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.LOG10E 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.LOG2E 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.PI 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.SQRT1_2 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.SQRT2 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.abs 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.acos 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.acosh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.asin 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.asinh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.atan 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.atan2 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.atanh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.cbrt 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.ceil 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.clz32 📋Firefox7/22/2014 Chrome10/7/201477
javascript.builtins.Math.cos 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.cosh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.exp 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.expm1 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.f16round 📋Firefox8/6/2024 Chrome4/1/2025238
javascript.builtins.Math.floor 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.fround 📋Firefox12/10/2013 Chrome10/7/2014301
javascript.builtins.Math.hypot 📋Firefox2/4/2014 Chrome10/7/2014245
javascript.builtins.Math.imul 📋Firefox4/2/2013 Chrome7/9/201398
javascript.builtins.Math.log 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.log10 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.log1p 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.log2 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.max 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.min 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.pow 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.random 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.round 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.sign 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.sin 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.sinh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.sqrt 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.tan 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Math.tanh 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Math.trunc 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.NaN 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.EPSILON 📋Firefox10/29/2013 Chrome4/8/2014161
javascript.builtins.Number.MAX_SAFE_INTEGER 📋Chrome4/8/2014 Firefox7/22/2014105
javascript.builtins.Number.MAX_VALUE 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.MIN_SAFE_INTEGER 📋Chrome4/8/2014 Firefox7/22/2014105
javascript.builtins.Number.MIN_VALUE 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.NEGATIVE_INFINITY 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.NaN 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.Number 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.POSITIVE_INFINITY 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.isFinite 📋Chrome5/15/2012 Firefox10/9/2012147
javascript.builtins.Number.isInteger 📋Firefox10/9/2012 Chrome4/8/2014546
javascript.builtins.Number.isNaN 📋Firefox8/28/2012 Chrome2/21/2013177
javascript.builtins.Number.isSafeInteger 📋Chrome4/8/2014 Firefox9/2/2014147
javascript.builtins.Number.parseFloat 📋Firefox10/29/2013 Chrome4/8/2014161
javascript.builtins.Number.parseInt 📋Firefox10/29/2013 Chrome4/8/2014161
javascript.builtins.Number.toExponential 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.toFixed 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.toLocaleString 📋Firefox11/9/2004 Chrome12/11/20081493
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.toLocaleString.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.Number.toPrecision 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Number.valueOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.Object 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.assign 📋Firefox12/1/2014 Chrome9/1/2015274
javascript.builtins.Object.constructor 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.create 📋Chrome5/25/2010 Firefox3/22/2011301
javascript.builtins.Object.defineGetter 📋Firefox11/9/2004 Chrome12/11/20081493
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 Firefox3/22/2011301
javascript.builtins.Object.defineProperty 📋Chrome5/25/2010 Firefox3/22/2011301
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 📋Firefox11/9/2004 Chrome12/11/20081493
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.entries 📋Firefox6/7/2016 Chrome10/12/2016127
javascript.builtins.Object.freeze 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.fromEntries 📋Firefox10/23/2018 Chrome3/12/2019140
javascript.builtins.Object.getOwnPropertyDescriptor 📋Chrome5/25/2010 Firefox3/22/2011301
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.getOwnPropertyDescriptors 📋Chrome10/12/2016 Firefox11/15/201634
javascript.builtins.Object.getOwnPropertyNames 📋Chrome5/25/2010 Firefox3/22/2011301
javascript.builtins.Object.getOwnPropertySymbols 📋Chrome10/7/2014 Firefox2/24/2015140
javascript.builtins.Object.getPrototypeOf 📋Firefox6/30/2009 Chrome5/25/2010329
javascript.builtins.Object.groupBy 📋Chrome9/12/2023 Firefox10/24/202342
javascript.builtins.Object.hasOwn 📋Chrome8/31/2021 Firefox9/7/20217
javascript.builtins.Object.hasOwnProperty 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.is 📋Chrome5/15/2012 Firefox6/25/2013406
javascript.builtins.Object.isExtensible 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.isFrozen 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.isPrototypeOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.isSealed 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.keys 📋Chrome5/25/2010 Firefox3/22/2011301
javascript.builtins.Object.lookupGetter 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.lookupSetter 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.preventExtensions 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.preventExtensions.ES2015_behavior Firefox1/13/2015 Chrome7/21/2015189
javascript.builtins.Object.propertyIsEnumerable 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.proto 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.seal 📋Chrome9/2/2010 Firefox3/22/2011201
javascript.builtins.Object.setPrototypeOf 📋Chrome4/8/2014 Firefox7/22/2014105
javascript.builtins.Object.toLocaleString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.valueOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.Object.values 📋Firefox6/7/2016 Chrome10/12/2016127
javascript.builtins.Promise 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.@@species 📋Chrome5/25/2016 Firefox8/2/201669
javascript.builtins.Promise.Promise 📋Chrome1/14/2014 Firefox4/29/2014105
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 Firefox4/29/2014105
javascript.builtins.Promise.allSettled 📋Chrome7/30/2019 Firefox12/10/2019133
javascript.builtins.Promise.any 📋Firefox7/28/2020 Chrome8/25/202028
javascript.builtins.Promise.catch 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.finally 📋Chrome12/6/2017 Firefox1/23/201848
javascript.builtins.Promise.race 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.reject 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.resolve 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.then 📋Chrome1/14/2014 Firefox4/29/2014105
javascript.builtins.Promise.try 📋Chrome8/20/2024 Firefox1/7/2025140
javascript.builtins.Promise.withResolvers 📋Chrome10/31/2023 Firefox12/19/202349
javascript.builtins.Proxy 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.Proxy 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.apply 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.construct 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.defineProperty 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.deleteProperty 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.get 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.getOwnPropertyDescriptor 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.getPrototypeOf 📋Chrome3/2/2016 Firefox9/20/2016202
javascript.builtins.Proxy.handler.has 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.isExtensible 📋Firefox7/22/2014 Chrome3/2/2016589
javascript.builtins.Proxy.handler.ownKeys 📋Firefox1/8/2013 Chrome3/2/20161149
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 📋Firefox6/25/2013 Chrome3/2/2016981
javascript.builtins.Proxy.handler.set 📋Firefox1/8/2013 Chrome3/2/20161149
javascript.builtins.Proxy.handler.setPrototypeOf 📋Chrome3/2/2016 Firefox9/20/2016202
javascript.builtins.Proxy.revocable 📋Firefox12/1/2014 Chrome12/6/20171101
javascript.builtins.RangeError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RangeError.RangeError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RangeError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.ReferenceError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.ReferenceError.ReferenceError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.ReferenceError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Reflect 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.apply 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.construct 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.defineProperty 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.deleteProperty 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.get 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.getOwnPropertyDescriptor 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.getPrototypeOf 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.has 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.isExtensible 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.ownKeys 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.preventExtensions 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.set 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.Reflect.setPrototypeOf 📋Firefox11/3/2015 Chrome3/2/2016120
javascript.builtins.RegExp 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.@@match 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@matchAll 📋Chrome3/12/2019 Firefox5/21/201970
javascript.builtins.RegExp.@@replace 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@search 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@species 📋Chrome5/25/2016 Firefox9/20/2016118
javascript.builtins.RegExp.@@split 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.RegExp 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.compile 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.dotAll 📋Chrome10/17/2017 Firefox6/30/2020987
javascript.builtins.RegExp.escape 📋Firefox1/7/2025 Chrome4/29/2025112
javascript.builtins.RegExp.exec 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.flags 📋Firefox3/31/2015 Chrome3/2/2016337
javascript.builtins.RegExp.global 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.global.prototype_accessor Firefox5/12/2015 Chrome1/20/2016253
javascript.builtins.RegExp.hasIndices 📋Chrome4/13/2021 Firefox4/19/20216
javascript.builtins.RegExp.ignoreCase 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.ignoreCase.prototype_accessor Firefox5/12/2015 Chrome1/20/2016253
javascript.builtins.RegExp.input 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.lastIndex 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.lastMatch 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.lastParen 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.leftContext 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.multiline 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.multiline.prototype_accessor Firefox5/12/2015 Chrome1/20/2016253
javascript.builtins.RegExp.n 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.rightContext 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.source 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.source.empty_regex_string Chrome9/2/2010 Firefox5/12/20151713
javascript.builtins.RegExp.source.escaping Firefox5/12/2015 Chrome3/12/20191400
javascript.builtins.RegExp.source.prototype_accessor Firefox9/22/2015 Chrome1/20/2016120
javascript.builtins.RegExp.sticky 📋Firefox6/17/2008 Chrome3/2/20162815
javascript.builtins.RegExp.sticky.anchored_sticky_flag Firefox1/26/2016 Chrome3/2/201636
javascript.builtins.RegExp.sticky.prototype_accessor Firefox5/12/2015 Chrome3/2/2016295
javascript.builtins.RegExp.test 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.RegExp.toString.escaping Firefox5/12/2015 Chrome3/12/20191400
javascript.builtins.RegExp.unicode 📋Chrome4/13/2016 Firefox4/26/201613
Edge: Case folding is implemented in version 13Node.js: Case folding is implemented in version 8.6.0
javascript.builtins.RegExp.unicodeSets 📋Chrome4/4/2023 Firefox8/1/2023119
javascript.builtins.Set 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Set.@@iterator 📋Firefox2/24/2015 Chrome5/19/201584
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.@@species 📋Firefox9/22/2015 Chrome5/25/2016246
javascript.builtins.Set.Set 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Set.Set.iterable_allowed Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Set.Set.null_allowed Chrome10/7/2014 Firefox3/31/2015175
javascript.builtins.Set.add 📋Firefox6/5/2012 Chrome10/7/2014854
Internet Explorer: Returns 'undefined' instead of the 'Set' object.
javascript.builtins.Set.clear 📋Firefox2/19/2013 Chrome10/7/2014595
javascript.builtins.Set.delete 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Set.difference 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.entries 📋Firefox9/17/2013 Chrome10/7/2014385
javascript.builtins.Set.forEach 📋Firefox10/29/2013 Chrome10/7/2014343
javascript.builtins.Set.has 📋Firefox6/5/2012 Chrome10/7/2014854
javascript.builtins.Set.intersection 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isDisjointFrom 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isSubsetOf 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isSupersetOf 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.key_equality_for_zeros Firefox4/29/2014 Chrome10/7/2014161
javascript.builtins.Set.keys 📋Firefox9/17/2013 Chrome10/7/2014385
javascript.builtins.Set.size 📋Firefox2/19/2013 Chrome10/7/2014595
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.symmetricDifference 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.union 📋Chrome2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.values 📋Firefox9/17/2013 Chrome10/7/2014385
javascript.builtins.SharedArrayBuffer 📋Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.SharedArrayBuffer.@@species 📋Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer 📋Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer.maxByteLength_option 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.byteLength 📋Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.SharedArrayBuffer.grow 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.growable 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.maxByteLength 📋Chrome3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.slice 📋Chrome7/24/2018 Firefox7/28/2020735
javascript.builtins.String 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.@@iterator 📋Chrome10/7/2014 Firefox2/24/2015140
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.String 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.anchor 📋Firefox11/9/2004 Chrome12/11/20081493
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.at 📋Firefox7/13/2021 Chrome7/20/20217
javascript.builtins.String.big 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.blink 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.bold 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.charAt 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.charCodeAt 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.codePointAt 📋Firefox4/29/2014 Chrome3/3/2015308
javascript.builtins.String.concat 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.endsWith 📋Firefox11/20/2012 Chrome3/3/2015833
javascript.builtins.String.fixed 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.fontcolor 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.fontsize 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.fromCharCode 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.fromCodePoint 📋Firefox4/29/2014 Chrome3/3/2015308
javascript.builtins.String.includes 📋Chrome3/3/2015 Firefox8/11/2015161
javascript.builtins.String.indexOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.isWellFormed 📋Chrome3/7/2023 Firefox10/24/2023231
javascript.builtins.String.italics 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.lastIndexOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.length 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.link 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.localeCompare 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.localeCompare.locales_parameter Chrome1/10/2013 Firefox4/29/2014474
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 Firefox4/29/2014474
javascript.builtins.String.match 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.matchAll 📋Chrome3/12/2019 Firefox5/21/201970
javascript.builtins.String.normalize 📋Chrome4/8/2014 Firefox7/22/2014105
javascript.builtins.String.padEnd 📋Firefox8/2/2016 Chrome3/9/2017219
javascript.builtins.String.padStart 📋Firefox8/2/2016 Chrome3/9/2017219
javascript.builtins.String.raw 📋Firefox12/1/2014 Chrome3/3/201592
javascript.builtins.String.repeat 📋Firefox9/17/2013 Chrome3/3/2015532
javascript.builtins.String.replace 📋Firefox11/9/2004 Chrome12/11/20081493
Internet Explorer: A replacement function as second argument is not supported.
javascript.builtins.String.replaceAll 📋Firefox6/2/2020 Chrome8/25/202084
javascript.builtins.String.search 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.slice 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.small 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.split 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.startsWith 📋Firefox11/20/2012 Chrome3/3/2015833
javascript.builtins.String.strike 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.sub 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.substr 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.substring 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.sup 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toLocaleLowerCase 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toLocaleLowerCase.locales_parameter Chrome4/19/2017 Firefox8/8/2017111
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 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toLocaleUpperCase.locales_parameter Chrome4/19/2017 Firefox8/8/2017111
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.toLowerCase 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toString 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toUpperCase 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.String.toWellFormed 📋Chrome3/7/2023 Firefox10/24/2023231
javascript.builtins.String.trim 📋Firefox6/30/2009 Chrome1/25/2010209
javascript.builtins.String.trimEnd 📋Chrome4/17/2018 Firefox6/26/201870
javascript.builtins.String.trimStart 📋Chrome4/17/2018 Firefox6/26/201870
javascript.builtins.String.unicode_code_point_escapes Chrome12/11/2008 Firefox8/11/20152434
javascript.builtins.String.valueOf 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.SuppressedError 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.SuppressedError 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.error 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.suppressed 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.builtins.Symbol 📋Chrome10/7/2014 Firefox2/24/2015140
Edge: Edge 12 included Symbol properties in JSON.stringify() output.
javascript.builtins.Symbol.@@toPrimitive 📋Chrome12/1/2015 Firefox1/26/201656
javascript.builtins.Symbol.Symbol 📋Chrome10/7/2014 Firefox2/24/2015140
javascript.builtins.Symbol.asyncDispose 📋Chrome7/23/2024 Firefox7/22/2025364
Node.js: Only available for fs and stream resources.Node.js: Only available for fs and stream resources.
javascript.builtins.Symbol.asyncIterator 📋Firefox11/14/2017 Chrome12/6/201722
javascript.builtins.Symbol.description 📋Chrome10/16/2018 Firefox10/23/20187
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.dispose 📋Chrome5/14/2024 Firefox7/22/2025434
Node.js: Only available for fs and stream resources.Node.js: Only available for fs and stream resources.
javascript.builtins.Symbol.for 📋Chrome1/21/2015 Firefox2/24/201534
javascript.builtins.Symbol.hasInstance 📋Chrome4/13/2016 Firefox11/15/2016216
javascript.builtins.Symbol.isConcatSpreadable 📋Chrome1/20/2016 Firefox8/2/2016195
javascript.builtins.Symbol.iterator 📋Firefox2/24/2015 Chrome5/19/201584
javascript.builtins.Symbol.keyFor 📋Chrome1/21/2015 Firefox2/24/201534
javascript.builtins.Symbol.match 📋Firefox8/11/2015 Chrome4/13/2016246
javascript.builtins.Symbol.matchAll 📋Chrome3/12/2019 Firefox5/21/201970
javascript.builtins.Symbol.replace 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.search 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.species 📋Firefox9/22/2015 Chrome5/25/2016246
javascript.builtins.Symbol.split 📋Chrome4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.toPrimitive 📋Chrome12/1/2015 Firefox1/26/201656
javascript.builtins.Symbol.toString 📋Chrome10/7/2014 Firefox2/24/2015140
javascript.builtins.Symbol.toStringTag 📋Chrome3/2/2016 Firefox1/24/2017328
javascript.builtins.Symbol.toStringTag.dom_objects Chrome4/13/2016 Firefox6/30/20201539
javascript.builtins.Symbol.unscopables 📋Chrome10/7/2014 Firefox8/2/2016665
javascript.builtins.Symbol.valueOf 📋Chrome10/7/2014 Firefox2/24/2015140
javascript.builtins.SyntaxError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.SyntaxError.SyntaxError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.SyntaxError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Temporal 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.Duration 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.abs 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.blank 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.days 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.hours 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.microseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.milliseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.minutes 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.months 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.nanoseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.negated 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.round 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.seconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.sign 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.total 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.weeks 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Duration.years 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.epochMilliseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.epochNanoseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.fromEpochMilliseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.fromEpochNanoseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.round 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.toZonedDateTimeISO 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Instant.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.instant 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.plainDateISO 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.plainDateTimeISO 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.plainTimeISO 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.timeZoneId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.Now.zonedDateTimeISO 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.calendarId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.day 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.dayOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.dayOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.era 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.eraYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.inLeapYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.month 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.monthCode 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.monthsInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainMonthDay 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainYearMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.toZonedDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.weekOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.withCalendar 📋Firefox5/27/2025 Chrome1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.PlainDate.year 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDate.yearOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.calendarId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.day 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.dayOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.dayOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.era 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.eraYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.hour 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.inLeapYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.microsecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.millisecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.minute 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.month 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.monthCode 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.monthsInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.nanosecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.round 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.second 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toPlainDate 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toPlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toZonedDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.weekOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.withCalendar 📋Firefox5/27/2025 Chrome1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.PlainDateTime.withPlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.year 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainDateTime.yearOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.calendarId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.day 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.monthCode 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toPlainDate 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.PlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.hour 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.microsecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.millisecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.minute 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.nanosecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.round 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.second 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainTime.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.calendarId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.daysInMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.daysInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.era 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.eraYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.inLeapYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.month 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.monthCode 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.monthsInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toPlainDate 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.year 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.add 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.calendarId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.compare 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.day 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.dayOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.dayOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInMonth 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.epochMilliseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.epochNanoseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.equals 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.era 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.eraYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.from 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.getTimeZoneTransition 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.hour 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.hoursInDay 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.inLeapYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.microsecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.millisecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.minute 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.month 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.monthCode 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.monthsInYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.nanosecond 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.offset 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.offsetNanoseconds 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.round 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.second 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.since 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.startOfDay 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.subtract 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.timeZoneId 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toInstant 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toJSON 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toLocaleString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainDate 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainDateTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toString 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.until 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.valueOf 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.weekOfYear 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.with 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.withCalendar 📋Firefox5/27/2025 Chrome1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.ZonedDateTime.withPlainTime 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.withTimeZone 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.year 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.yearOfWeek 📋Firefox5/27/2025 Chrome1/13/2026231
javascript.builtins.TypeError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.TypeError.TypeError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.TypeError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.TypedArray 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.@@iterator 📋Chrome10/7/2014 Firefox2/24/2015140
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 📋Chrome5/25/2016 Firefox8/2/201669
javascript.builtins.TypedArray.BYTES_PER_ELEMENT 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.at 📋Firefox7/13/2021 Chrome7/20/20217
javascript.builtins.TypedArray.buffer 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.byteLength 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.byteOffset 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.TypedArray.copyWithin 📋Firefox12/1/2014 Chrome9/1/2015274
javascript.builtins.TypedArray.entries 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.every 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.fill 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.filter 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.find 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.findIndex 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.findLast 📋Chrome1/4/2022 Firefox8/23/2022231
javascript.builtins.TypedArray.findLastIndex 📋Chrome1/4/2022 Firefox8/23/2022231
javascript.builtins.TypedArray.forEach 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.from 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.includes 📋Chrome12/1/2015 Firefox12/15/201514
javascript.builtins.TypedArray.indexOf 📋Firefox3/31/2015 Chrome9/1/2015154
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.index_properties_not_consulting_prototype Chrome10/19/2010 Firefox10/29/20131106
Bun: Negative integers are not considered as indexed properties and therefore return the value of the prototype property.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.iterable_in_constructor Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.TypedArray.join 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.keys 📋Chrome10/7/2014 Firefox3/31/2015175
javascript.builtins.TypedArray.lastIndexOf 📋Firefox3/31/2015 Chrome9/1/2015154
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.length 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.map 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.name 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.named_properties Chrome10/19/2010 Firefox6/10/20141330
javascript.builtins.TypedArray.of 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.reduce 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.reduceRight 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.reverse 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.set 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.slice 📋Firefox5/12/2015 Chrome9/1/2015112
javascript.builtins.TypedArray.some 📋Firefox3/31/2015 Chrome9/1/2015154
javascript.builtins.TypedArray.sort 📋Chrome9/1/2015 Firefox4/26/2016238
javascript.builtins.TypedArray.subarray 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.TypedArray.toLocaleString 📋Chrome10/19/2010 Firefox1/24/20172289
javascript.builtins.TypedArray.toReversed 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.TypedArray.toSorted 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.TypedArray.toString 📋Chrome10/19/2010 Firefox1/24/20172289
javascript.builtins.TypedArray.values 📋Chrome10/7/2014 Firefox3/31/2015175
javascript.builtins.TypedArray.with 📋Chrome2/7/2023 Firefox7/4/2023147
javascript.builtins.URIError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.URIError.URIError 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.URIError.serializable_object 📋Chrome9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Uint16Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint16Array.Uint16Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint16Array.Uint16Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Uint16Array.Uint16Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Uint32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint32Array.Uint32Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint32Array.Uint32Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Uint32Array.Uint32Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Uint8Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint8Array.Uint8Array 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint8Array.Uint8Array.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Uint8Array.Uint8Array.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.Uint8Array.fromBase64 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8Array.fromHex 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8Array.setFromBase64 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8Array.setFromHex 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8Array.toBase64 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8Array.toHex 📋Firefox11/26/2024 Chrome9/2/2025280
javascript.builtins.Uint8ClampedArray 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray 📋Chrome10/19/2010 Firefox3/22/2011154
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.constructor_without_parameters Chrome10/19/2010 Firefox8/8/20172485
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.iterable_allowed Chrome11/18/2014 Firefox3/7/2017840
javascript.builtins.WeakMap 📋Firefox8/16/2011 Chrome7/16/20141065
javascript.builtins.WeakMap.WeakMap 📋Firefox8/16/2011 Chrome7/16/20141065
javascript.builtins.WeakMap.WeakMap.iterable_allowed Chrome10/7/2014 Firefox2/24/2015140
javascript.builtins.WeakMap.WeakMap.null_allowed Chrome7/16/2014 Firefox3/31/2015258
javascript.builtins.WeakMap.delete 📋Firefox8/16/2011 Chrome7/16/20141065
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 📋Firefox8/16/2011 Chrome7/16/20141065
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.getOrInsert 📋Firefox10/14/2025 Chrome2/10/2026119
javascript.builtins.WeakMap.getOrInsertComputed 📋Firefox10/14/2025 Chrome2/10/2026119
javascript.builtins.WeakMap.has 📋Firefox8/16/2011 Chrome7/16/20141065
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 📋Firefox8/16/2011 Chrome7/16/20141065
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.WeakMap.symbol_as_keys Chrome1/10/2023 Firefox12/9/20251064
javascript.builtins.WeakRef 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.WeakRef.WeakRef 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.WeakRef.WeakRef.symbol_as_target Chrome1/10/2023 Firefox12/9/20251064
javascript.builtins.WeakRef.deref 📋Chrome7/27/2020 Firefox7/28/20201
javascript.builtins.WeakSet 📋Chrome7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.WeakSet 📋Chrome7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.WeakSet.iterable_allowed Chrome10/7/2014 Firefox12/1/201455
javascript.builtins.WeakSet.WeakSet.null_allowed Chrome7/16/2014 Firefox3/31/2015258
javascript.builtins.WeakSet.add 📋Chrome7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.delete 📋Chrome7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.has 📋Chrome7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.symbol_as_keys Chrome1/10/2023 Firefox12/9/20251064
javascript.builtins.decodeURI 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.decodeURIComponent 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.encodeURI 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.encodeURIComponent 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.escape 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.eval 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.globalThis 📋Chrome12/4/2018 Firefox1/29/201956
javascript.builtins.isFinite 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.isNaN 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.parseFloat 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.parseInt 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.parseInt.leading_zero_strings_as_decimal Chrome11/6/2012 Firefox5/14/2013189
javascript.builtins.undefined 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.builtins.unescape 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.classes 📋Chrome3/2/2016 Firefox3/8/20166
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 📋Chrome3/2/2016 Firefox3/8/20166
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 📋Chrome3/2/2016 Firefox3/8/20166
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.private_class_fields 📋Chrome4/23/2019 Firefox7/13/2021812
javascript.classes.private_class_fields_in 📋Chrome5/25/2021 Firefox7/13/202149
javascript.classes.private_class_methods 📋Chrome7/27/2020 Firefox7/13/2021351
javascript.classes.public_class_fields 📋Chrome1/29/2019 Firefox9/3/2019217
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.
javascript.classes.static 📋Chrome3/2/2016 Firefox3/8/20166
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.class_fields 📋Chrome1/29/2019 Firefox4/7/2020434
javascript.classes.static.initialization_blocks 📋Chrome9/21/2021 Firefox10/5/202114
javascript.functions 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.functions.arguments 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.functions.arguments.@@iterator 📋Firefox4/26/2016 Chrome7/20/201685
javascript.functions.arguments.callee 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.functions.arguments.length 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.functions.arrow_functions 📋Firefox6/25/2013 Chrome9/1/2015798
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.arrow_functions.trailing_comma Firefox3/7/2017 Chrome4/19/201743
javascript.functions.block_level_functions Chrome3/2/2016 Firefox4/26/201655
javascript.functions.default_parameters 📋Firefox8/28/2012 Chrome3/2/20161282
javascript.functions.default_parameters.destructured_parameter_with_default_value_assignment Firefox9/22/2015 Chrome3/2/2016162
javascript.functions.default_parameters.parameters_without_defaults_after_default_parameters Firefox12/10/2013 Chrome3/2/2016813
javascript.functions.get 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.functions.get.computed_property_names Firefox12/1/2014 Chrome10/13/2015316
javascript.functions.method_definitions 📋Chrome11/18/2014 Firefox12/1/201413
javascript.functions.method_definitions.async_generator_methods Firefox11/14/2017 Chrome12/6/201722
javascript.functions.method_definitions.async_methods Chrome12/1/2016 Firefox3/7/201796
javascript.functions.method_definitions.generator_methods_not_constructable Chrome4/14/2015 Firefox12/15/2015245
javascript.functions.rest_parameters 📋Firefox8/28/2012 Chrome12/1/20151190
javascript.functions.rest_parameters.destructuring Chrome3/2/2016 Firefox3/7/2017370
javascript.functions.set 📋Firefox11/29/2005 Chrome12/11/20081108
javascript.functions.set.computed_property_names Firefox12/1/2014 Chrome10/13/2015316
javascript.grammar.array_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.binary_numeric_literals 📋Firefox10/29/2013 Chrome3/3/2015490
javascript.grammar.boolean_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.decimal_numeric_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.hashbang_comments 📋Chrome4/23/2019 Firefox5/21/201928
javascript.grammar.hexadecimal_escape_sequences 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.hexadecimal_numeric_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.null_literal 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.numeric_separators 📋Chrome6/4/2019 Firefox10/22/2019140
javascript.grammar.octal_numeric_literals 📋Firefox10/29/2013 Chrome3/3/2015490
javascript.grammar.regular_expression_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.shorthand_object_literals Firefox10/14/2014 Chrome5/19/2015217
javascript.grammar.string_literals 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.template_literals 📋Firefox12/1/2014 Chrome3/3/201592
javascript.grammar.template_literals.template_literal_revision Firefox4/19/2017 Chrome10/17/2017181
javascript.grammar.trailing_commas 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import 📋Chrome5/25/2021 Firefox4/29/20251435
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.grammar.trailing_commas.trailing_commas_in_functions Firefox3/7/2017 Chrome4/19/201743
javascript.grammar.trailing_commas.trailing_commas_in_object_literals Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.unicode_escape_sequences 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.grammar.unicode_point_escapes 📋Chrome7/21/2015 Firefox8/11/201521
javascript.operators.addition 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.addition_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.async_function 📋Chrome12/1/2016 Firefox3/7/201796
javascript.operators.async_generator_function 📋Firefox11/14/2017 Chrome12/6/201722
javascript.operators.await 📋Chrome12/1/2016 Firefox3/7/201796
javascript.operators.await.top_level 📋Chrome3/2/2021 Firefox6/1/202191
Node.js: Not supported in CommonJS modules.Safari: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).Safari on iOS: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).WebView on iOS: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).
javascript.operators.bitwise_and 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_and_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_not 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_or 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_or_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_xor 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.bitwise_xor_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.class 📋Chrome4/14/2015 Firefox3/8/2016329
javascript.operators.comma 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.conditional 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.decrement 📋Firefox11/9/2004 Chrome5/21/20091654
javascript.operators.delete 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.destructuring 📋Firefox9/22/2015 Chrome3/2/2016162
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.operators.destructuring.computed_property_names Firefox9/22/2015 Chrome3/2/2016162
javascript.operators.destructuring.rest_in_arrays Firefox9/22/2015 Chrome3/2/2016162
javascript.operators.destructuring.rest_in_objects Chrome7/25/2017 Firefox8/8/201714
javascript.operators.division 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.division_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.equality 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.exponentiation 📋Chrome7/20/2016 Firefox3/7/2017230
javascript.operators.exponentiation_assignment 📋Chrome7/20/2016 Firefox3/7/2017230
javascript.operators.function 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.function.trailing_comma Firefox3/7/2017 Chrome4/19/201743
javascript.operators.generator_function 📋Firefox12/10/2013 Chrome3/2/2016813
javascript.operators.generator_function.trailing_comma Firefox3/7/2017 Chrome4/19/201743
javascript.operators.greater_than 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.greater_than_or_equal 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.grouping 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.import 📋Chrome12/6/2017 Firefox5/21/2019531
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.options_parameter 📋Chrome5/25/2021 Firefox4/29/20251435
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 Firefox6/6/20231218
javascript.operators.import_meta 📋Chrome1/23/2018 Firefox9/5/2018225
javascript.operators.import_meta.resolve 📋Chrome9/2/2022 Firefox10/18/202246
Node.js: Returns a URL object instead of a string.
javascript.operators.in 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.increment 📋Firefox11/9/2004 Chrome5/21/20091654
javascript.operators.inequality 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.instanceof 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.left_shift 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.left_shift_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.less_than 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.less_than_or_equal 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.logical_and 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.logical_and_assignment 📋Firefox7/28/2020 Chrome8/25/202028
javascript.operators.logical_not 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.logical_or 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.logical_or_assignment 📋Firefox7/28/2020 Chrome8/25/202028
javascript.operators.multiplication 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.multiplication_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.new 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.new_target 📋Firefox9/22/2015 Chrome10/13/201521
javascript.operators.null 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.nullish_coalescing 📋Firefox1/7/2020 Chrome2/4/202028
javascript.operators.nullish_coalescing_assignment 📋Firefox7/28/2020 Chrome8/25/202028
javascript.operators.object_initializer 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.object_initializer.computed_property_names Firefox12/1/2014 Chrome12/1/2015365
javascript.operators.object_initializer.shorthand_method_names Firefox12/1/2014 Chrome12/1/2015365
javascript.operators.object_initializer.shorthand_property_names Firefox10/14/2014 Chrome12/1/2015413
javascript.operators.object_initializer.spread_properties Chrome7/25/2017 Firefox8/8/201714
javascript.operators.optional_chaining 📋Chrome2/4/2020 Firefox3/10/202035
javascript.operators.property_accessors 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.remainder 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.remainder_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.right_shift 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.right_shift_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.spread 📋Firefox10/9/2012 Chrome10/13/20151099
javascript.operators.spread.spread_in_arrays 📋Firefox10/9/2012 Chrome10/13/20151099
javascript.operators.spread.spread_in_function_calls 📋Firefox2/4/2014 Chrome10/13/2015616
javascript.operators.spread.spread_in_object_literals 📋Chrome7/25/2017 Firefox8/8/201714
javascript.operators.strict_equality 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.strict_inequality 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.subtraction 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.subtraction_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.super 📋Chrome4/14/2015 Firefox3/8/2016329
javascript.operators.this 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.typeof 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.unary_negation 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.unary_plus 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.unsigned_right_shift 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.unsigned_right_shift_assignment 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.void 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.operators.yield 📋Firefox12/10/2013 Chrome11/18/2014343
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 📋Firefox2/4/2014 Chrome11/18/2014287
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.backreference 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.capturing_group 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.character_class 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.character_class_escape 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.character_escape 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.character_escape.unicode Chrome4/13/2016 Firefox4/26/201613
javascript.regular_expressions.disjunction 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.input_boundary_assertion 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.literal_character 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.lookahead_assertion 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.lookbehind_assertion 📋Chrome10/17/2017 Firefox6/30/2020987
javascript.regular_expressions.modifier 📋Chrome5/14/2024 Firefox10/29/2024168
javascript.regular_expressions.named_backreference 📋Chrome1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.named_capturing_group 📋Chrome1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups Chrome5/14/2024 Firefox8/6/202484
javascript.regular_expressions.non_capturing_group 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.quantifier 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.unicode_character_class_escape 📋Chrome1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.wildcard 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.regular_expressions.word_boundary_assertion 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.async_function 📋Chrome12/1/2016 Firefox3/7/201796
javascript.statements.async_generator_function 📋Firefox11/14/2017 Chrome12/6/201722
javascript.statements.await_using 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.statements.block 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.break 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.class 📋Chrome3/2/2016 Firefox3/8/20166
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.statements.const 📋Chrome7/31/2012 Firefox2/24/2015938
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 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.debugger 📋Firefox11/9/2004 Chrome5/25/20102023
javascript.statements.do_while 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.empty 📋Firefox11/9/2004 Chrome9/15/20091771
javascript.statements.export 📋Chrome9/5/2017 Firefox5/9/2018246
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.arbitrary_module_namespace_identifier_names Chrome1/19/2021 Firefox3/23/202163
javascript.statements.export.default 📋Chrome9/5/2017 Firefox5/9/2018246
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.namespace 📋Chrome1/29/2019 Firefox8/25/2020574
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.for 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.for_await_of 📋Firefox11/14/2017 Chrome12/6/201722
javascript.statements.for_in 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.for_of 📋Firefox6/5/2012 Chrome10/7/2014854
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.for_of.async_iterators Firefox11/14/2017 Chrome12/6/201722
javascript.statements.for_of.closing_iterators Chrome5/25/2016 Firefox4/19/2017329
javascript.statements.function 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.function.trailing_comma_in_parameters Firefox3/7/2017 Chrome4/19/201743
javascript.statements.generator_function 📋Firefox12/10/2013 Chrome11/18/2014343
javascript.statements.generator_function.IteratorResult_object Firefox4/29/2014 Chrome3/2/2016673
javascript.statements.generator_function.not_constructable_with_new Firefox12/15/2015 Chrome4/13/2016120
javascript.statements.generator_function.trailing_comma_in_parameters Firefox3/7/2017 Chrome4/19/201743
javascript.statements.if_else 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.import 📋Chrome9/5/2017 Firefox5/9/2018246
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.
javascript.statements.import.arbitrary_module_namespace_identifier_names Chrome1/19/2021 Firefox3/23/202163
javascript.statements.import.import_attributes 📋Chrome3/19/2024 Firefox4/29/2025406
javascript.statements.import.import_attributes.type_css Chrome3/19/2024 Firefox1/13/2026665
javascript.statements.import.import_attributes.type_json Chrome3/19/2024 Firefox4/29/2025406
javascript.statements.import.service_worker_support Chrome5/25/2021 Firefox1/13/20261694
javascript.statements.import.worker_support Chrome2/4/2020 Firefox6/6/20231218
javascript.statements.label 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.let 📋Firefox1/26/2016 Chrome3/2/201636
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.
javascript.statements.return 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.switch 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.throw 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.try_catch 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.try_catch.optional_catch_binding Firefox1/23/2018 Chrome4/17/201884
javascript.statements.using 📋Chrome3/4/2025 Firefox7/22/2025140
javascript.statements.var 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.while 📋Firefox11/9/2004 Chrome12/11/20081493
javascript.statements.with 📋Firefox11/9/2004 Chrome12/11/20081493