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

Summary

A count of the number of APIs that landed in A first and B last.
	Last in Chrome	Last in Safari
First in Chrome		635
First in Safari	440

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

1075 APIs took an average of 850.89 days to become available to use.

API breakdown:

JS: 850.89 days

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 Safari). TTA (time to available).
	JS APIs	JS TTA
2003	286	1996.28
2005	9	2485.11
2007	25	412.00
2008	3	238.33
2009	13	797.62
2010	63	245.11
2011	25	253.64
2012	6	1263.33
2013	63	1189.51
2014	121	320.02
2015	63	281.17
2016	92	198.28
2017	31	353.81
2018	58	849.48
2019	47	534.81
2020	37	229.19
2021	20	176.40
2022	32	142.22
2023	48	221.65
2024	27	301.89
2025	6	53.67

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 Safari. TTA (time to available).
Year	JS	JS TTA
2003
Safari	286	1996.28
2005
Safari	9	2485.11
2007
Safari	25	412.00
2008
Chrome	1	179.00
Safari	2	268.00
2009
Safari	7	99.00
Chrome	6	1612.67
2010
Chrome	62	247.66
Safari	1	87.00
2011
Safari	2	290.00
Chrome	23	250.48
2012
Chrome	3	878.00
Safari	3	1648.67
2013
Chrome	56	1261.16
Safari	7	616.29
2014
Chrome	113	316.49
Safari	8	370.00
2015
Chrome	53	293.09
Safari	10	218.00
2016
Chrome	80	196.88
Safari	12	207.67
2017
Safari	5	216.40
Chrome	26	380.23
2018
Chrome	57	864.30
Safari	1	5.00
2019
Chrome	47	534.81
2020
Chrome	36	231.28
Safari	1	154.00
2021
Chrome	17	199.12
Safari	3	47.67
2022
Chrome	14	96.29
Safari	18	177.94
2023
Safari	24	325.63
Chrome	24	117.67
2024
Safari	12	190.33
Chrome	15	391.13
2025
Chrome	2	41.00
Safari	4	60.00

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 Safari. TTA (time to available).
Year	JS count	JS TTA
2003
Chrome	286	1996.28
2005
Chrome	9	2485.11
2007
Chrome	25	412.00
2008
Safari	1	179.00
Chrome	2	268.00
2009
Chrome	7	99.00
Safari	6	1612.67
2010
Safari	62	247.66
Chrome	1	87.00
2011
Chrome	2	290.00
Safari	23	250.48
2012
Safari	3	878.00
Chrome	3	1648.67
2013
Safari	56	1261.16
Chrome	7	616.29
2014
Safari	113	316.49
Chrome	8	370.00
2015
Safari	53	293.09
Chrome	10	218.00
2016
Safari	80	196.88
Chrome	12	207.67
2017
Chrome	5	216.40
Safari	26	380.23
2018
Safari	57	864.30
Chrome	1	5.00
2019
Safari	47	534.81
2020
Safari	36	231.28
Chrome	1	154.00
2021
Safari	17	199.12
Chrome	3	47.67
2022
Safari	14	96.29
Chrome	18	177.94
2023
Chrome	24	325.63
Safari	24	117.67
2024
Chrome	12	190.33
Safari	15	391.13
2025
Safari	2	41.00
Chrome	4	60.00

Stable APIs

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

Raw Data

Quick Links:

JS Data

API	First Browser	Date	Last Browser	Date	Days	Notes
javascript.builtins.AggregateError 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.builtins.AggregateError.AggregateError 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.builtins.AggregateError.errors 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.builtins.AggregateError.serializable_object	Chrome	2/1/2022	Safari	9/18/2023	594	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.@@iterator 📋	Chrome	10/7/2014	Safari	9/20/2016	714	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 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.Array.@@unscopables 📋	Chrome	10/7/2014	Safari	9/20/2016	714
javascript.builtins.Array.Array 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.at 📋	Chrome	7/20/2021	Safari	3/14/2022	237
javascript.builtins.Array.concat 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.copyWithin 📋	Chrome	9/1/2015	Safari	9/30/2015	29
javascript.builtins.Array.entries 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Array.every 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.fill 📋	Safari	10/16/2014	Chrome	9/1/2015	320
javascript.builtins.Array.filter 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.find 📋	Safari	10/16/2014	Chrome	9/1/2015	320
javascript.builtins.Array.findIndex 📋	Safari	10/16/2014	Chrome	9/1/2015	320
javascript.builtins.Array.findLast 📋	Chrome	1/4/2022	Safari	3/14/2022	69
javascript.builtins.Array.findLastIndex 📋	Chrome	1/4/2022	Safari	3/14/2022	69
javascript.builtins.Array.flat 📋	Chrome	9/4/2018	Safari	9/17/2018	13
javascript.builtins.Array.flatMap 📋	Chrome	9/4/2018	Safari	9/17/2018	13
javascript.builtins.Array.forEach 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.from 📋	Chrome	9/1/2015	Safari	9/30/2015	29
javascript.builtins.Array.fromAsync 📋	Safari	3/27/2023	Chrome	1/23/2024	302
javascript.builtins.Array.includes 📋	Safari	9/30/2015	Chrome	12/1/2015	62
javascript.builtins.Array.indexOf 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.isArray 📋	Chrome	1/25/2010	Safari	6/7/2010	133
javascript.builtins.Array.join 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.keys 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Array.lastIndexOf 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.length 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.map 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.of 📋	Chrome	9/1/2015	Safari	9/30/2015	29
javascript.builtins.Array.pop 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.push 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.reduce 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.Array.reduceRight 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.Array.reverse 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.shift 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.slice 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.some 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Array.sort 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.sort.stable_sorting	Safari	3/27/2017	Chrome	10/16/2018	568
javascript.builtins.Array.splice 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.toLocaleString.locales_parameter	Chrome	1/10/2013	Safari	10/22/2013	285	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	Chrome	1/10/2013	Safari	10/22/2013	285
javascript.builtins.Array.toReversed 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.Array.toSorted 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.Array.toSpliced 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.Array.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.unshift 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Array.values 📋	Safari	9/30/2015	Chrome	4/17/2018	930
javascript.builtins.Array.with 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.ArrayBuffer 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.ArrayBuffer.@@species 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.ArrayBuffer.ArrayBuffer 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.ArrayBuffer.ArrayBuffer.maxByteLength_option 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.ArrayBuffer.byteLength 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.ArrayBuffer.detached 📋	Chrome	5/30/2023	Safari	3/5/2024	280
javascript.builtins.ArrayBuffer.isView 📋	Safari	10/22/2013	Chrome	1/14/2014	84
javascript.builtins.ArrayBuffer.maxByteLength 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.ArrayBuffer.resizable 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.ArrayBuffer.resize 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.ArrayBuffer.slice 📋	Safari	7/20/2011	Chrome	2/8/2012	203	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 📋	Chrome	5/30/2023	Safari	3/5/2024	280
javascript.builtins.ArrayBuffer.transferToFixedLength 📋	Chrome	5/30/2023	Safari	3/5/2024	280
javascript.builtins.AsyncFunction 📋	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.builtins.AsyncFunction.AsyncFunction 📋	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.builtins.AsyncGenerator 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncGenerator.next 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncGenerator.return 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncGenerator.throw 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncGeneratorFunction 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncGeneratorFunction.AsyncGeneratorFunction 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.builtins.AsyncIterator 📋	Chrome	12/6/2017	Safari	4/12/2018	127
javascript.builtins.AsyncIterator.@@asyncIterator 📋	Chrome	12/6/2017	Safari	4/12/2018	127
javascript.builtins.Atomics 📋	Chrome	7/24/2018	Safari	12/13/2021	1238	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 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.and 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.compareExchange 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.exchange 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.isLockFree 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.load 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.notify 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.or 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.pause 📋	Chrome	2/4/2025	Safari	3/31/2025	55
javascript.builtins.Atomics.store 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.sub 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.wait 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.Atomics.waitAsync 📋	Chrome	4/13/2021	Safari	3/27/2023	713	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 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.BigInt 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.BigInt 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.asIntN 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.asUintN 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.toLocaleString 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.toLocaleString.locales_parameter	Chrome	7/30/2019	Safari	9/16/2020	414	Deno: Only the locale data for `en-US` is available.
javascript.builtins.BigInt.toLocaleString.options_parameter	Chrome	7/30/2019	Safari	9/16/2020	414
javascript.builtins.BigInt.toString 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt.valueOf 📋	Chrome	5/29/2018	Safari	9/16/2020	841
javascript.builtins.BigInt64Array 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.BigInt64Array.BigInt64Array 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.BigUint64Array 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.BigUint64Array.BigUint64Array 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.Boolean 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Boolean.Boolean 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Boolean.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Boolean.valueOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.DataView 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.DataView 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.DataView.sharedarraybuffer_support	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.DataView.buffer 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.byteLength 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.byteOffset 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getBigInt64 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.DataView.getBigUint64 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.DataView.getFloat16 📋	Safari	12/11/2024	Chrome	4/1/2025	111
javascript.builtins.DataView.getFloat32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getFloat64 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getInt16 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getInt32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getInt8 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getUint16 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getUint32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.getUint8 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setBigInt64 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.DataView.setBigUint64 📋	Chrome	5/29/2018	Safari	9/20/2021	1210
javascript.builtins.DataView.setFloat16 📋	Safari	12/11/2024	Chrome	4/1/2025	111
javascript.builtins.DataView.setFloat32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setFloat64 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setInt16 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setInt32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setInt8 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setUint16 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setUint32 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.DataView.setUint8 📋	Chrome	2/3/2011	Safari	7/20/2011	167
javascript.builtins.Date 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	Internet Explorer: The ISO8601 Date Format is not supported in Internet Explorer 8 or earlier.
javascript.builtins.Date.@@toPrimitive 📋	Chrome	12/1/2015	Safari	9/20/2016	294
javascript.builtins.Date.Date 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.UTC 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.UTC.optional_monthIndex	Chrome	10/25/2011	Safari	3/27/2017	1980
javascript.builtins.Date.getDate 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getDay 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getFullYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getHours 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getMilliseconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getMinutes 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getMonth 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getSeconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getTime 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getTimezoneOffset 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCDate 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCDay 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCFullYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCHours 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCMilliseconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCMinutes 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCMonth 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getUTCSeconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.getYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.now 📋	Chrome	12/11/2008	Safari	6/8/2009	179
javascript.builtins.Date.parse 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.parse.iso_8601	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Date.setDate 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setFullYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setHours 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setMilliseconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setMinutes 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setMonth 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setSeconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setTime 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCDate 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCFullYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCHours 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCMilliseconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCMinutes 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCMonth 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setUTCSeconds 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.setYear 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toDateString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toGMTString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toISOString 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.Date.toJSON 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.Date.toLocaleDateString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toLocaleDateString.iana_time_zone_names	Chrome	1/10/2013	Safari	10/22/2013	285
javascript.builtins.Date.toLocaleDateString.locales_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Date.toLocaleString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toLocaleString.iana_time_zone_names	Chrome	1/10/2013	Safari	10/22/2013	285
javascript.builtins.Date.toLocaleString.locales_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Date.toLocaleTimeString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toLocaleTimeString.iana_time_zone_names	Chrome	1/10/2013	Safari	10/22/2013	285
javascript.builtins.Date.toLocaleTimeString.locales_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Date.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toTimeString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.toUTCString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Date.valueOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Error 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Error.Error 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Error.Error.options_cause_parameter 📋	Chrome	8/31/2021	Safari	9/20/2021	20
javascript.builtins.Error.captureStackTrace 📋	Chrome	9/15/2009	Safari	12/11/2023	5200
javascript.builtins.Error.cause 📋	Chrome	8/31/2021	Safari	9/20/2021	20	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 📋	Chrome	3/4/2025	Safari	3/31/2025	27	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Error.name 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Error.stack	Chrome	9/15/2009	Safari	7/25/2012	1044
javascript.builtins.Error.stackTraceLimit	Chrome	9/15/2009	Safari	4/12/2018	3131
javascript.builtins.Error.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.EvalError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.EvalError.EvalError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.FinalizationRegistry 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.FinalizationRegistry.FinalizationRegistry 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.FinalizationRegistry.register 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.FinalizationRegistry.register.symbol_as_target	Chrome	1/10/2023	Safari	3/27/2023	76
javascript.builtins.FinalizationRegistry.unregister 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.FinalizationRegistry.unregister.symbol_as_target	Chrome	1/10/2023	Safari	3/27/2023	76
javascript.builtins.Float16Array 📋	Safari	12/11/2024	Chrome	4/1/2025	111
javascript.builtins.Float16Array.Float16Array 📋	Safari	12/11/2024	Chrome	4/1/2025	111
javascript.builtins.Float32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float32Array.Float32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float32Array.Float32Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float32Array.Float32Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Float64Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float64Array.Float64Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float64Array.Float64Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Float64Array.Float64Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Function 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.@@hasInstance 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Function.Function 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.apply 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.apply.generic_arrays_as_arguments	Chrome	2/8/2012	Safari	7/25/2012	168
javascript.builtins.Function.arguments	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.bind 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Function.call 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	Node.js: When calling this method, `thisArg` does not default to the global object.
javascript.builtins.Function.caller	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Function.length 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.length.configurable_true	Chrome	5/19/2015	Safari	9/20/2016	490
javascript.builtins.Function.name 📋	Chrome	10/25/2011	Safari	7/25/2012	274
javascript.builtins.Function.name.configurable_true	Chrome	5/19/2015	Safari	9/20/2016	490
javascript.builtins.Function.name.inferred_names	Chrome	5/25/2016	Safari	9/20/2016	118	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Function.toString.toString_revision	Chrome	4/17/2018	Safari	9/18/2023	1980
javascript.builtins.Generator 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Generator.next 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Generator.return 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Generator.throw 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.GeneratorFunction 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.GeneratorFunction.GeneratorFunction 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Infinity 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Int16Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int16Array.Int16Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int16Array.Int16Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int16Array.Int16Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Int32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int32Array.Int32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int32Array.Int32Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int32Array.Int32Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Int8Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int8Array.Int8Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int8Array.Int8Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Int8Array.Int8Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Intl 📋	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/19/2017	1713
javascript.builtins.Intl.Collator.Collator.options_collation_parameter	Chrome	10/20/2020	Safari	4/26/2021	188
javascript.builtins.Intl.Collator.Collator.options_ignorePunctuation_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator.Collator.options_localeMatcher_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator.Collator.options_numeric_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator.Collator.options_sensitivity_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator.Collator.options_usage_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.Collator.compare 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Safari	4/26/2021	Chrome	5/25/2021	29	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	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter	Chrome	2/4/2020	Safari	4/26/2021	447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter	Chrome	7/30/2019	Safari	4/26/2021	636
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter	Safari	4/26/2021	Chrome	7/20/2021	85
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter	Chrome	3/12/2019	Safari	9/19/2019	191
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter	Chrome	2/4/2020	Safari	4/26/2021	447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter	Chrome	7/30/2019	Safari	4/26/2021	636
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values	Chrome	10/19/2021	Safari	3/14/2022	146
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.DateTimeFormat.format 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	7/30/2019	Safari	4/26/2021	636	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 📋	Chrome	7/30/2019	Safari	4/26/2021	636	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 📋	Chrome	3/9/2017	Safari	9/19/2017	194	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	5/20/2014	Safari	9/20/2016	854
javascript.builtins.Intl.DateTimeFormat.supportedLocalesOf 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	4/7/2020	Safari	4/26/2021	384
javascript.builtins.Intl.DisplayNames.DisplayNames 📋	Chrome	4/7/2020	Safari	4/26/2021	384
javascript.builtins.Intl.DisplayNames.of 📋	Chrome	4/7/2020	Safari	4/26/2021	384
javascript.builtins.Intl.DisplayNames.resolvedOptions 📋	Chrome	4/7/2020	Safari	4/26/2021	384
javascript.builtins.Intl.DisplayNames.supportedLocalesOf 📋	Chrome	4/7/2020	Safari	4/26/2021	384
javascript.builtins.Intl.DurationFormat 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.DurationFormat.DurationFormat 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.DurationFormat.format 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.DurationFormat.formatToParts 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.DurationFormat.resolvedOptions 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋	Safari	3/27/2023	Chrome	9/17/2024	540
javascript.builtins.Intl.ListFormat 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.Locale 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.baseName 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.calendar 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.caseFirst 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.collation 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.getCalendars 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getCollations 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getHourCycles 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getNumberingSystems 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTextInfo 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTimeZones 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getWeekInfo 📋	Safari	9/18/2023	Chrome	10/15/2024	393	Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.hourCycle 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.language 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.maximize 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.minimize 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.numberingSystem 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.numeric 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.region 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.script 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.Locale.toString 📋	Chrome	4/23/2019	Safari	9/16/2020	512
javascript.builtins.Intl.NumberFormat 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol 📋	Safari	4/26/2021	Chrome	5/25/2021	29	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	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter	Chrome	9/10/2019	Safari	4/26/2021	594	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	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter	Chrome	1/10/2013	Safari	4/26/2021	3028
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter	Chrome	9/10/2019	Safari	4/26/2021	594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	9/27/2022	Safari	3/27/2023	181
javascript.builtins.Intl.NumberFormat.format 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.formatRange 📋	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.formatRangeToParts 📋	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.NumberFormat.formatToParts 📋	Chrome	1/23/2018	Safari	9/19/2019	604	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	1/10/2013	Safari	9/20/2016	1349	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 📋	Chrome	12/6/2017	Safari	9/19/2019	652	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 📋	Chrome	12/6/2017	Safari	9/19/2019	652	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	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingMode_parameter	Chrome	9/12/2023	Safari	12/11/2023	90
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingPriority_parameter	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.PluralRules.resolvedOptions 📋	Chrome	12/6/2017	Safari	9/19/2019	652	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 📋	Chrome	12/6/2017	Safari	9/19/2019	652	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 📋	Safari	3/14/2022	Chrome	9/27/2022	197
javascript.builtins.Intl.PluralRules.supportedLocalesOf 📋	Chrome	12/6/2017	Safari	9/19/2019	652	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 📋	Chrome	12/4/2018	Safari	9/16/2020	652	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 📋	Chrome	12/4/2018	Safari	9/16/2020	652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.locales_parameter	Chrome	12/4/2018	Safari	9/16/2020	652	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	Chrome	12/4/2018	Safari	9/16/2020	652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numberingSystem_parameter	Chrome	12/4/2018	Safari	9/16/2020	652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numeric_parameter	Chrome	12/4/2018	Safari	9/16/2020	652
javascript.builtins.Intl.RelativeTimeFormat.format 📋	Chrome	12/4/2018	Safari	9/16/2020	652	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 📋	Chrome	12/4/2018	Safari	9/16/2020	652	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 📋	Chrome	12/4/2018	Safari	9/16/2020	652	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 📋	Chrome	12/4/2018	Safari	9/16/2020	652	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 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segmenter.Segmenter 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segmenter.resolvedOptions 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segmenter.segment 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segmenter.supportedLocalesOf 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segments 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segments.@@iterator 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.Segments.containing 📋	Chrome	11/17/2020	Safari	4/26/2021	160
javascript.builtins.Intl.getCanonicalLocales 📋	Chrome	10/12/2016	Safari	3/27/2017	166
javascript.builtins.Intl.supportedValuesOf 📋	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_calendar	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_collation	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_currency	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_numberingSystem	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_timeZone	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Intl.supportedValuesOf.key_parameter_unit	Chrome	3/1/2022	Safari	3/14/2022	13
javascript.builtins.Iterator 📋	Chrome	10/7/2014	Safari	9/20/2016	714
javascript.builtins.Iterator.@@iterator 📋	Chrome	10/7/2014	Safari	9/20/2016	714	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 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.drop 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.every 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.filter 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.find 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.flatMap 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.forEach 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.from 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.map 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.reduce 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.some 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.take 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.Iterator.toArray 📋	Chrome	2/20/2024	Safari	3/31/2025	405
javascript.builtins.JSON 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.JSON.json_superset	Chrome	4/17/2018	Safari	9/17/2018	153
javascript.builtins.JSON.parse 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.JSON.parse.reviver_parameter_context_argument 📋	Chrome	5/30/2023	Safari	3/31/2025	671
javascript.builtins.JSON.stringify 📋	Safari	6/8/2009	Chrome	9/15/2009	99
javascript.builtins.JSON.stringify.well_formed_stringify	Chrome	1/29/2019	Safari	3/25/2019	55
javascript.builtins.Map 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.@@iterator 📋	Chrome	10/7/2014	Safari	9/20/2016	714	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 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.Map.Map 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.Map.iterable_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Map.Map.null_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Map.clear 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.delete 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.entries 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.forEach 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.get 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.getOrInsert 📋	Safari	12/12/2025	Chrome	2/10/2026	60
javascript.builtins.Map.getOrInsertComputed 📋	Safari	12/12/2025	Chrome	2/10/2026	60
javascript.builtins.Map.groupBy 📋	Chrome	9/12/2023	Safari	3/5/2024	175
javascript.builtins.Map.has 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.key_equality_for_zeros	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Map.keys 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Map.set 📋	Chrome	10/7/2014	Safari	10/16/2014	9	Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.Map.size 📋	Chrome	10/7/2014	Safari	10/16/2014	9	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 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.E 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.LN10 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.LN2 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.LOG10E 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.LOG2E 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.PI 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.SQRT1_2 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.SQRT2 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.abs 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.acos 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.acosh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.asin 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.asinh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.atan 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.atan2 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.atanh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.cbrt 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.ceil 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.clz32 📋	Safari	10/22/2013	Chrome	10/7/2014	350
javascript.builtins.Math.cos 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.cosh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.exp 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.expm1 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.f16round 📋	Safari	12/11/2024	Chrome	4/1/2025	111
javascript.builtins.Math.floor 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.fround 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.hypot 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.imul 📋	Chrome	7/9/2013	Safari	10/22/2013	105
javascript.builtins.Math.log 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.log10 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.log1p 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.log2 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.max 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.min 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.pow 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.random 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.round 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.sign 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Math.sin 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.sinh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.sqrt 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.tan 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Math.tanh 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Math.trunc 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.NaN 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.EPSILON 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.MAX_SAFE_INTEGER 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.MAX_VALUE 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.MIN_SAFE_INTEGER 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.MIN_VALUE 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.NEGATIVE_INFINITY 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.NaN 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.Number 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.POSITIVE_INFINITY 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.isFinite 📋	Chrome	5/15/2012	Safari	9/30/2015	1233
javascript.builtins.Number.isInteger 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.isNaN 📋	Chrome	2/21/2013	Safari	9/30/2015	951
javascript.builtins.Number.isSafeInteger 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.parseFloat 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.parseInt 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Number.toExponential 📋	Safari	4/29/2005	Chrome	12/11/2008	1322
javascript.builtins.Number.toFixed 📋	Safari	4/29/2005	Chrome	12/11/2008	1322
javascript.builtins.Number.toLocaleString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	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	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.Number.toPrecision 📋	Safari	4/29/2005	Chrome	12/11/2008	1322
javascript.builtins.Number.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Number.valueOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.Object 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.assign 📋	Chrome	9/1/2015	Safari	9/30/2015	29
javascript.builtins.Object.constructor 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.create 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.builtins.Object.defineGetter 📋	Safari	10/26/2007	Chrome	12/11/2008	412	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 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.builtins.Object.defineProperty 📋	Chrome	5/25/2010	Safari	7/20/2011	421	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 📋	Safari	10/26/2007	Chrome	12/11/2008	412	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 📋	Chrome	10/12/2016	Safari	3/27/2017	166
javascript.builtins.Object.freeze 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.fromEntries 📋	Chrome	3/12/2019	Safari	3/25/2019	13
javascript.builtins.Object.getOwnPropertyDescriptor 📋	Chrome	5/25/2010	Safari	6/7/2010	13	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 📋	Safari	9/20/2016	Chrome	10/12/2016	22
javascript.builtins.Object.getOwnPropertyNames 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.builtins.Object.getOwnPropertySymbols 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Object.getPrototypeOf 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.builtins.Object.groupBy 📋	Chrome	9/12/2023	Safari	3/5/2024	175
javascript.builtins.Object.hasOwn 📋	Chrome	8/31/2021	Safari	3/14/2022	195
javascript.builtins.Object.hasOwnProperty 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.is 📋	Chrome	5/15/2012	Safari	9/30/2015	1233
javascript.builtins.Object.isExtensible 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.isFrozen 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.isPrototypeOf 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.isSealed 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.keys 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.builtins.Object.lookupGetter 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.lookupSetter 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.preventExtensions 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.preventExtensions.ES2015_behavior	Chrome	7/21/2015	Safari	9/30/2015	71
javascript.builtins.Object.propertyIsEnumerable 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.proto 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.Object.seal 📋	Chrome	9/2/2010	Safari	7/20/2011	321
javascript.builtins.Object.setPrototypeOf 📋	Chrome	4/8/2014	Safari	9/30/2015	540
javascript.builtins.Object.toLocaleString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.valueOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Object.values 📋	Chrome	10/12/2016	Safari	3/27/2017	166
javascript.builtins.Promise 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.@@species 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.Promise.Promise 📋	Chrome	1/14/2014	Safari	10/16/2014	275	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 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.allSettled 📋	Chrome	7/30/2019	Safari	9/19/2019	51
javascript.builtins.Promise.any 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.builtins.Promise.catch 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.finally 📋	Chrome	12/6/2017	Safari	4/12/2018	127
javascript.builtins.Promise.race 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.reject 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.resolve 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.then 📋	Chrome	1/14/2014	Safari	10/16/2014	275
javascript.builtins.Promise.try 📋	Chrome	8/20/2024	Safari	12/11/2024	113
javascript.builtins.Promise.withResolvers 📋	Chrome	10/31/2023	Safari	3/5/2024	126
javascript.builtins.Proxy 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.Proxy 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.apply 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.construct 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.defineProperty 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.deleteProperty 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.get 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.getOwnPropertyDescriptor 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.getPrototypeOf 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.has 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.isExtensible 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.ownKeys 📋	Chrome	3/2/2016	Safari	9/20/2016	202	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 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.set 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.handler.setPrototypeOf 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Proxy.revocable 📋	Safari	9/20/2016	Chrome	12/6/2017	442
javascript.builtins.RangeError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RangeError.RangeError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.ReferenceError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.ReferenceError.ReferenceError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Reflect 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.apply 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.construct 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.defineProperty 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.deleteProperty 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.get 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.getOwnPropertyDescriptor 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.getPrototypeOf 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.has 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.isExtensible 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.ownKeys 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.preventExtensions 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.set 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Reflect.setPrototypeOf 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.RegExp 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.@@match 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.RegExp.@@matchAll 📋	Chrome	3/12/2019	Safari	9/19/2019	191
javascript.builtins.RegExp.@@replace 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.RegExp.@@search 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.RegExp.@@species 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.RegExp.@@split 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.RegExp.RegExp 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.compile 📋	Safari	3/18/2008	Chrome	12/11/2008	268
javascript.builtins.RegExp.dotAll 📋	Chrome	10/17/2017	Safari	4/12/2018	177
javascript.builtins.RegExp.escape 📋	Safari	12/11/2024	Chrome	4/29/2025	139
javascript.builtins.RegExp.exec 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.flags 📋	Safari	9/30/2015	Chrome	3/2/2016	154
javascript.builtins.RegExp.global 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.global.prototype_accessor	Safari	4/15/2005	Chrome	1/20/2016	3932
javascript.builtins.RegExp.hasIndices 📋	Chrome	4/13/2021	Safari	9/20/2021	160
javascript.builtins.RegExp.ignoreCase 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.ignoreCase.prototype_accessor	Safari	4/15/2005	Chrome	1/20/2016	3932
javascript.builtins.RegExp.input 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.RegExp.lastIndex 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.lastMatch 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.RegExp.lastParen 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.RegExp.leftContext 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.RegExp.multiline 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.multiline.prototype_accessor	Safari	4/15/2005	Chrome	1/20/2016	3932
javascript.builtins.RegExp.n 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.rightContext 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.RegExp.source 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.source.empty_regex_string	Safari	6/7/2010	Chrome	9/2/2010	87
javascript.builtins.RegExp.source.escaping	Safari	7/25/2012	Chrome	3/12/2019	2421
javascript.builtins.RegExp.source.prototype_accessor	Safari	4/15/2005	Chrome	1/20/2016	3932
javascript.builtins.RegExp.sticky 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.RegExp.sticky.anchored_sticky_flag	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.RegExp.sticky.prototype_accessor	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.RegExp.test 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.RegExp.toString.escaping	Safari	7/25/2012	Chrome	3/12/2019	2421
javascript.builtins.RegExp.unicode 📋	Chrome	4/13/2016	Safari	9/20/2016	160	Edge: Case folding is implemented in version 13Node.js: Case folding is implemented in version 8.6.0
javascript.builtins.RegExp.unicodeSets 📋	Chrome	4/4/2023	Safari	9/18/2023	167
javascript.builtins.Set 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.@@iterator 📋	Chrome	5/19/2015	Safari	9/30/2015	134	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 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.Set.Set 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.Set.iterable_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Set.Set.null_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Set.add 📋	Chrome	10/7/2014	Safari	10/16/2014	9	Internet Explorer: Returns 'undefined' instead of the 'Set' object.
javascript.builtins.Set.clear 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.delete 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.difference 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.entries 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.forEach 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.has 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.intersection 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.isDisjointFrom 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.isSubsetOf 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.isSupersetOf 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.key_equality_for_zeros	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Set.keys 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.Set.size 📋	Chrome	10/7/2014	Safari	10/16/2014	9	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 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.union 📋	Safari	9/18/2023	Chrome	2/20/2024	155
javascript.builtins.Set.values 📋	Chrome	10/7/2014	Safari	10/16/2014	9
javascript.builtins.SharedArrayBuffer 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.SharedArrayBuffer.@@species 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer.maxByteLength_option 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.SharedArrayBuffer.byteLength 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.SharedArrayBuffer.grow 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.SharedArrayBuffer.growable 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.SharedArrayBuffer.maxByteLength 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.SharedArrayBuffer.slice 📋	Chrome	7/24/2018	Safari	12/13/2021	1238
javascript.builtins.String 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.@@iterator 📋	Chrome	10/7/2014	Safari	9/30/2015	358	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.anchor 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	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 📋	Chrome	7/20/2021	Safari	3/14/2022	237
javascript.builtins.String.big 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.blink 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.bold 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.charAt 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.charCodeAt 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.codePointAt 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.concat 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.endsWith 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.fixed 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.fontcolor 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.fontsize 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.fromCharCode 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.fromCodePoint 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.includes 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.indexOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.isWellFormed 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.String.italics 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.lastIndexOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.length 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.link 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.localeCompare 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.builtins.String.localeCompare.locales_parameter	Chrome	1/10/2013	Safari	9/20/2016	1349	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	Chrome	1/10/2013	Safari	9/20/2016	1349
javascript.builtins.String.match 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.matchAll 📋	Chrome	3/12/2019	Safari	9/19/2019	191
javascript.builtins.String.normalize 📋	Chrome	4/8/2014	Safari	9/20/2016	896
javascript.builtins.String.padEnd 📋	Safari	9/20/2016	Chrome	3/9/2017	170
javascript.builtins.String.padStart 📋	Safari	9/20/2016	Chrome	3/9/2017	170
javascript.builtins.String.raw 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.repeat 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.replace 📋	Safari	6/23/2003	Chrome	12/11/2008	1998	Internet Explorer: A replacement function as second argument is not supported.
javascript.builtins.String.replaceAll 📋	Safari	3/24/2020	Chrome	8/25/2020	154
javascript.builtins.String.search 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.slice 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.small 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.split 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.startsWith 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.builtins.String.strike 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.sub 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.substr 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.substring 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.sup 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.toLocaleLowerCase 📋	Safari	4/15/2005	Chrome	12/11/2008	1336
javascript.builtins.String.toLocaleLowerCase.locales_parameter	Safari	9/20/2016	Chrome	4/19/2017	211	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 📋	Safari	4/15/2005	Chrome	12/11/2008	1336
javascript.builtins.String.toLocaleUpperCase.locales_parameter	Safari	9/20/2016	Chrome	4/19/2017	211	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.toString 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.toUpperCase 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.toWellFormed 📋	Chrome	3/7/2023	Safari	3/27/2023	20
javascript.builtins.String.trim 📋	Chrome	1/25/2010	Safari	6/7/2010	133
javascript.builtins.String.trimEnd 📋	Chrome	4/17/2018	Safari	9/17/2018	153
javascript.builtins.String.trimStart 📋	Chrome	4/17/2018	Safari	9/17/2018	153
javascript.builtins.String.unicode_code_point_escapes	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.String.valueOf 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Symbol 📋	Chrome	10/7/2014	Safari	9/30/2015	358	Edge: Edge 12 included Symbol properties in `JSON.stringify()` output.
javascript.builtins.Symbol.@@toPrimitive 📋	Chrome	12/1/2015	Safari	9/20/2016	294
javascript.builtins.Symbol.Symbol 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Symbol.asyncIterator 📋	Chrome	12/6/2017	Safari	4/12/2018	127
javascript.builtins.Symbol.description 📋	Chrome	10/16/2018	Safari	3/25/2019	160	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.for 📋	Chrome	1/21/2015	Safari	9/30/2015	252
javascript.builtins.Symbol.hasInstance 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Symbol.isConcatSpreadable 📋	Chrome	1/20/2016	Safari	9/20/2016	244
javascript.builtins.Symbol.iterator 📋	Chrome	5/19/2015	Safari	9/20/2016	490
javascript.builtins.Symbol.keyFor 📋	Chrome	1/21/2015	Safari	9/30/2015	252
javascript.builtins.Symbol.match 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Symbol.matchAll 📋	Chrome	3/12/2019	Safari	9/19/2019	191
javascript.builtins.Symbol.replace 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Symbol.search 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Symbol.species 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.Symbol.split 📋	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.builtins.Symbol.toPrimitive 📋	Chrome	12/1/2015	Safari	9/20/2016	294
javascript.builtins.Symbol.toString 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Symbol.toStringTag 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.builtins.Symbol.toStringTag.dom_objects	Chrome	4/13/2016	Safari	9/16/2020	1617
javascript.builtins.Symbol.unscopables 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.Symbol.valueOf 📋	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.SyntaxError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.SyntaxError.SyntaxError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.TypeError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.TypeError.TypeError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.TypedArray 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.@@iterator 📋	Chrome	10/7/2014	Safari	9/20/2016	714	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 📋	Chrome	5/25/2016	Safari	9/20/2016	118
javascript.builtins.TypedArray.BYTES_PER_ELEMENT 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.at 📋	Chrome	7/20/2021	Safari	3/14/2022	237
javascript.builtins.TypedArray.buffer 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.byteLength 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.byteOffset 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.copyWithin 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.entries 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.every 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.fill 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.filter 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.find 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.findIndex 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.findLast 📋	Chrome	1/4/2022	Safari	3/14/2022	69
javascript.builtins.TypedArray.findLastIndex 📋	Chrome	1/4/2022	Safari	3/14/2022	69
javascript.builtins.TypedArray.forEach 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.from 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.includes 📋	Chrome	12/1/2015	Safari	9/20/2016	294
javascript.builtins.TypedArray.indexOf 📋	Chrome	9/1/2015	Safari	9/20/2016	385	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	Chrome	10/19/2010	Safari	7/20/2011	274	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	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.TypedArray.join 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.keys 📋	Chrome	10/7/2014	Safari	9/20/2016	714
javascript.builtins.TypedArray.lastIndexOf 📋	Chrome	9/1/2015	Safari	9/20/2016	385	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 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.map 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.name 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.named_properties	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.of 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.reduce 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.reduceRight 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.reverse 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.set 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.slice 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.some 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.sort 📋	Chrome	9/1/2015	Safari	9/20/2016	385
javascript.builtins.TypedArray.subarray 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.toLocaleString 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.toReversed 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.TypedArray.toSorted 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.TypedArray.toString 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.TypedArray.values 📋	Chrome	10/7/2014	Safari	9/20/2016	714
javascript.builtins.TypedArray.with 📋	Safari	9/12/2022	Chrome	2/7/2023	148
javascript.builtins.URIError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.URIError.URIError 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.Uint16Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint16Array.Uint16Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint16Array.Uint16Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint16Array.Uint16Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Uint32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint32Array.Uint32Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint32Array.Uint32Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint32Array.Uint32Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Uint8Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8Array.Uint8Array 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8Array.Uint8Array.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8Array.Uint8Array.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.Uint8Array.fromBase64 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8Array.fromHex 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8Array.setFromBase64 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8Array.setFromHex 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8Array.toBase64 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8Array.toHex 📋	Safari	12/11/2024	Chrome	9/2/2025	265
javascript.builtins.Uint8ClampedArray 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray 📋	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.constructor_without_parameters	Chrome	10/19/2010	Safari	7/20/2011	274
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.iterable_allowed	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.builtins.WeakMap 📋	Chrome	7/16/2014	Safari	10/16/2014	92
javascript.builtins.WeakMap.WeakMap 📋	Chrome	7/16/2014	Safari	10/16/2014	92
javascript.builtins.WeakMap.WeakMap.iterable_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.WeakMap.WeakMap.null_allowed	Chrome	7/16/2014	Safari	10/16/2014	92
javascript.builtins.WeakMap.delete 📋	Chrome	7/16/2014	Safari	10/16/2014	92	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 📋	Chrome	7/16/2014	Safari	10/16/2014	92	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 📋	Safari	12/12/2025	Chrome	2/10/2026	60
javascript.builtins.WeakMap.getOrInsertComputed 📋	Safari	12/12/2025	Chrome	2/10/2026	60
javascript.builtins.WeakMap.has 📋	Chrome	7/16/2014	Safari	10/16/2014	92	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 📋	Chrome	7/16/2014	Safari	10/16/2014	92	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	Chrome	1/10/2023	Safari	3/27/2023	76
javascript.builtins.WeakRef 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.WeakRef.WeakRef 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.WeakRef.WeakRef.symbol_as_target	Chrome	1/10/2023	Safari	3/27/2023	76
javascript.builtins.WeakRef.deref 📋	Chrome	7/27/2020	Safari	4/26/2021	273
javascript.builtins.WeakSet 📋	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.WeakSet 📋	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.WeakSet.iterable_allowed	Chrome	10/7/2014	Safari	9/30/2015	358
javascript.builtins.WeakSet.WeakSet.null_allowed	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.add 📋	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.delete 📋	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.has 📋	Chrome	7/16/2014	Safari	9/30/2015	441
javascript.builtins.WeakSet.symbol_as_keys	Chrome	1/10/2023	Safari	3/27/2023	76
javascript.builtins.decodeURI 📋	Safari	10/24/2003	Chrome	12/11/2008	1875
javascript.builtins.decodeURIComponent 📋	Safari	10/24/2003	Chrome	12/11/2008	1875
javascript.builtins.encodeURI 📋	Safari	10/24/2003	Chrome	12/11/2008	1875
javascript.builtins.encodeURIComponent 📋	Safari	10/24/2003	Chrome	12/11/2008	1875
javascript.builtins.escape 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.eval 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.globalThis 📋	Chrome	12/4/2018	Safari	3/25/2019	111
javascript.builtins.isFinite 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.isNaN 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.parseFloat 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.parseInt 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.parseInt.leading_zero_strings_as_decimal	Safari	7/25/2012	Chrome	11/6/2012	104
javascript.builtins.undefined 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.builtins.unescape 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.classes 📋	Safari	9/30/2015	Chrome	3/2/2016	154	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 📋	Safari	9/30/2015	Chrome	3/2/2016	154	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 📋	Safari	9/30/2015	Chrome	3/2/2016	154	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 📋	Chrome	4/23/2019	Safari	4/26/2021	734
javascript.classes.private_class_fields_in 📋	Chrome	5/25/2021	Safari	9/20/2021	118
javascript.classes.private_class_methods 📋	Chrome	7/27/2020	Safari	9/20/2021	420
javascript.classes.public_class_fields 📋	Chrome	1/29/2019	Safari	9/12/2022	1322	Safari: Parentheses in field initializers can lead to `ReferenceError`s. See bug 236843.Safari: Doesn't support public static fields. See bug 194095.Safari on iOS: Parentheses in field initializers can lead to `ReferenceError`s. 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 `ReferenceError`s. See bug 236843.WebView on iOS: Doesn't support public static fields. See bug 194095.
javascript.classes.static 📋	Safari	9/30/2015	Chrome	3/2/2016	154	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818
javascript.classes.static.initialization_blocks 📋	Chrome	9/21/2021	Safari	3/27/2023	552
javascript.functions 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.functions.arguments 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.functions.arguments.@@iterator 📋	Safari	9/30/2015	Chrome	7/20/2016	294
javascript.functions.arguments.callee 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.functions.arguments.length 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.functions.arrow_functions 📋	Chrome	9/1/2015	Safari	9/20/2016	385	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	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.functions.block_level_functions	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.functions.default_parameters 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.functions.default_parameters.destructured_parameter_with_default_value_assignment	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.functions.default_parameters.parameters_without_defaults_after_default_parameters	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.functions.get 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.functions.get.computed_property_names	Chrome	10/13/2015	Safari	3/21/2016	160
javascript.functions.method_definitions 📋	Chrome	11/18/2014	Safari	9/30/2015	316
javascript.functions.method_definitions.async_generator_methods	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.functions.method_definitions.async_methods	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.functions.method_definitions.generator_methods_not_constructable	Chrome	4/14/2015	Safari	3/21/2016	342
javascript.functions.rest_parameters 📋	Chrome	12/1/2015	Safari	9/20/2016	294
javascript.functions.rest_parameters.destructuring	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.functions.set 📋	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.functions.set.computed_property_names	Chrome	10/13/2015	Safari	3/21/2016	160
javascript.grammar.array_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.binary_numeric_literals 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.grammar.boolean_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.decimal_numeric_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.hashbang_comments 📋	Chrome	4/23/2019	Safari	3/24/2020	336
javascript.grammar.hexadecimal_escape_sequences 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.hexadecimal_numeric_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.null_literal 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.numeric_separators 📋	Chrome	6/4/2019	Safari	9/19/2019	107
javascript.grammar.octal_numeric_literals 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.grammar.regular_expression_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.shorthand_object_literals	Chrome	5/19/2015	Safari	9/30/2015	134
javascript.grammar.string_literals 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.template_literals 📋	Chrome	3/3/2015	Safari	9/30/2015	211
javascript.grammar.template_literals.template_literal_revision	Safari	9/19/2017	Chrome	10/17/2017	28
javascript.grammar.trailing_commas 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import 📋	Chrome	5/25/2021	Safari	9/20/2021	118	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	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.grammar.trailing_commas.trailing_commas_in_object_literals	Safari	10/26/2007	Chrome	12/11/2008	412
javascript.grammar.unicode_escape_sequences 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.grammar.unicode_point_escapes 📋	Chrome	7/21/2015	Safari	9/30/2015	71
javascript.operators.addition 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.addition_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.async_function 📋	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.operators.async_generator_function 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.operators.await 📋	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.operators.await.top_level 📋	Chrome	3/2/2021	Safari	9/20/2021	202	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_and_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_not 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_or 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_or_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_xor 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.bitwise_xor_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.class 📋	Safari	10/22/2013	Chrome	4/14/2015	539
javascript.operators.comma 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.conditional 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.decrement 📋	Chrome	5/21/2009	Safari	6/8/2009	18
javascript.operators.delete 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.destructuring 📋	Safari	10/16/2014	Chrome	3/2/2016	503	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	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.operators.destructuring.rest_in_arrays	Chrome	3/2/2016	Safari	3/21/2016	19
javascript.operators.destructuring.rest_in_objects	Chrome	7/25/2017	Safari	4/12/2018	261
javascript.operators.division 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.division_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.equality 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.exponentiation 📋	Chrome	7/20/2016	Safari	3/27/2017	250
javascript.operators.exponentiation_assignment 📋	Chrome	7/20/2016	Safari	3/27/2017	250
javascript.operators.function 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.function.trailing_comma	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.operators.generator_function 📋	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.operators.generator_function.trailing_comma	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.operators.greater_than 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.greater_than_or_equal 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.grouping 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.import 📋	Chrome	12/6/2017	Safari	4/12/2018	127	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 📋	Chrome	5/25/2021	Safari	9/20/2021	118	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	Chrome	2/4/2020	Safari	9/20/2021	594
javascript.operators.import_meta 📋	Chrome	1/23/2018	Safari	4/12/2018	79
javascript.operators.import_meta.resolve 📋	Chrome	9/2/2022	Safari	3/27/2023	206	Node.js: Returns a `URL` object instead of a string.
javascript.operators.in 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.increment 📋	Chrome	5/21/2009	Safari	6/8/2009	18
javascript.operators.inequality 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.instanceof 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.left_shift 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.left_shift_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.less_than 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.less_than_or_equal 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.logical_and 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.logical_and_assignment 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.operators.logical_not 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.logical_or 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.logical_or_assignment 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.operators.multiplication 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.multiplication_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.new 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.new_target 📋	Chrome	10/13/2015	Safari	9/19/2017	707
javascript.operators.null 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.nullish_coalescing 📋	Chrome	2/4/2020	Safari	3/24/2020	49
javascript.operators.nullish_coalescing_assignment 📋	Chrome	8/25/2020	Safari	9/16/2020	22
javascript.operators.object_initializer 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.object_initializer.computed_property_names	Safari	10/16/2014	Chrome	12/1/2015	411
javascript.operators.object_initializer.shorthand_method_names	Safari	9/30/2015	Chrome	12/1/2015	62
javascript.operators.object_initializer.shorthand_property_names	Safari	9/30/2015	Chrome	12/1/2015	62
javascript.operators.object_initializer.spread_properties	Chrome	7/25/2017	Safari	4/12/2018	261
javascript.operators.optional_chaining 📋	Chrome	2/4/2020	Safari	3/24/2020	49
javascript.operators.property_accessors 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.remainder 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.remainder_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.right_shift 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.right_shift_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.spread 📋	Safari	10/16/2014	Chrome	10/13/2015	362
javascript.operators.spread.spread_in_arrays 📋	Safari	10/16/2014	Chrome	10/13/2015	362
javascript.operators.spread.spread_in_function_calls 📋	Safari	10/16/2014	Chrome	10/13/2015	362
javascript.operators.spread.spread_in_object_literals 📋	Chrome	7/25/2017	Safari	4/12/2018	261
javascript.operators.strict_equality 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.strict_inequality 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.subtraction 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.subtraction_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.super 📋	Safari	10/22/2013	Chrome	4/14/2015	539
javascript.operators.this 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.typeof 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.unary_negation 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.unary_plus 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.unsigned_right_shift 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.unsigned_right_shift_assignment 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.operators.void 📋	Safari	3/18/2008	Chrome	12/11/2008	268
javascript.operators.yield 📋	Chrome	11/18/2014	Safari	9/20/2016	672	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 📋	Chrome	11/18/2014	Safari	9/20/2016	672	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.capturing_group 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.character_class 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.character_class_escape 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.character_escape 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.character_escape.unicode	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.regular_expressions.disjunction 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.input_boundary_assertion 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.literal_character 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.lookahead_assertion 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.lookbehind_assertion 📋	Chrome	10/17/2017	Safari	3/27/2023	1987
javascript.regular_expressions.modifier 📋	Chrome	5/14/2024	Safari	9/15/2025	489
javascript.regular_expressions.named_backreference 📋	Chrome	1/23/2018	Safari	4/12/2018	79
javascript.regular_expressions.named_capturing_group 📋	Chrome	1/23/2018	Safari	4/12/2018	79
javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups	Safari	9/18/2023	Chrome	5/14/2024	239
javascript.regular_expressions.non_capturing_group 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.quantifier 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.unicode_character_class_escape 📋	Chrome	1/23/2018	Safari	4/12/2018	79
javascript.regular_expressions.wildcard 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.regular_expressions.word_boundary_assertion 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.async_function 📋	Chrome	12/1/2016	Safari	3/27/2017	116
javascript.statements.async_generator_function 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.statements.block 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.break 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.class 📋	Chrome	3/2/2016	Safari	3/27/2017	390	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 📋	Safari	7/20/2011	Chrome	7/31/2012	377	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.debugger 📋	Chrome	5/25/2010	Safari	6/7/2010	13
javascript.statements.do_while 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.empty 📋	Chrome	9/15/2009	Safari	6/7/2010	265
javascript.statements.export 📋	Safari	3/27/2017	Chrome	9/5/2017	162	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	Chrome	1/19/2021	Safari	4/26/2021	97
javascript.statements.export.default 📋	Safari	3/27/2017	Chrome	9/5/2017	162	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 📋	Chrome	1/29/2019	Safari	4/26/2021	818	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.for_await_of 📋	Chrome	12/6/2017	Safari	9/17/2018	285
javascript.statements.for_in 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.for_of 📋	Safari	10/22/2013	Chrome	10/7/2014	350	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	Safari	10/22/2013	Chrome	12/6/2017	1506
javascript.statements.for_of.closing_iterators	Safari	10/22/2013	Chrome	5/25/2016	946
javascript.statements.function 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.function.trailing_comma_in_parameters	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.statements.generator_function 📋	Chrome	11/18/2014	Safari	9/20/2016	672
javascript.statements.generator_function.IteratorResult_object	Chrome	3/2/2016	Safari	9/20/2016	202
javascript.statements.generator_function.not_constructable_with_new	Chrome	4/13/2016	Safari	9/20/2016	160
javascript.statements.generator_function.trailing_comma_in_parameters	Safari	9/20/2016	Chrome	4/19/2017	211
javascript.statements.if_else 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.import 📋	Safari	3/27/2017	Chrome	9/5/2017	162	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	Chrome	1/19/2021	Safari	4/26/2021	97
javascript.statements.import.import_attributes 📋	Safari	12/11/2023	Chrome	3/19/2024	99
javascript.statements.import.import_attributes.type_json	Safari	12/11/2023	Chrome	3/19/2024	99
javascript.statements.import.service_worker_support	Chrome	5/25/2021	Safari	9/20/2021	118
javascript.statements.import.worker_support	Chrome	2/4/2020	Safari	9/20/2021	594
javascript.statements.label 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.let 📋	Chrome	3/2/2016	Safari	9/20/2016	202	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 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.switch 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.throw 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.try_catch 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.try_catch.optional_catch_binding	Safari	4/12/2018	Chrome	4/17/2018	5
javascript.statements.var 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.while 📋	Safari	6/23/2003	Chrome	12/11/2008	1998
javascript.statements.with 📋	Safari	6/23/2003	Chrome	12/11/2008	1998