Time to Stable

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

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs that landed in A first and B last.
Last in FirefoxLast in Chrome Android
First in Firefox 1358
First in Chrome Android 608

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

1966 APIs took an average of 1248.94 days to become available to use.

API breakdown:

Average time to landing by year of first landing

If a feature landed in the earliest browser in 20XX it took Y days on average to become available in the last browser (when considering Firefox and Chrome Android). TTA (time to available).
JS APIsJS TTAHTML APIsHTML TTA
2004 3172787.003362804.93
2005 92402.0042402.00
2006 0NaN42386.25
2008 42384.5051471.00
2009 51093.00131093.00
2010 0NaN3888.00
2011 53531.1562575.56
2012 63807.5748807.10
2013 115575.57231160.96
2014 77321.29131085.85
2015 70203.599941.89
2016 47157.06221064.50
2017 42199.10131074.46
2018 42268.8817772.47
2019 50447.6611621.09
2020 56350.4111708.00
2021 25307.963623.00
2022 18268.949776.67
2023 33385.6410254.10
2024 45227.583102.67
2025 270218.845203.00
2026 156.000NaN

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 Firefox and Chrome Android. TTA (time to available).
Year JSJS TTAHTMLHTML TTA
2004
  Firefox 3172787.003362804.93
2005
  Firefox 92402.0042402.00
2006
  Firefox 0NaN42386.25
2008
  Firefox 42384.5051471.00
2009
  Firefox 51093.00131093.00
2010
  Firefox 0NaN3888.00
2011
  Firefox 53531.1562575.56
2012
  Chrome Android 38826.4740929.65
  Firefox 25778.848194.38
2013
  Firefox 58564.6981253.63
  Chrome Android 57586.63151111.53
2014
  Chrome Android 51311.57111141.91
  Firefox 26340.352777.50
2015
  Chrome Android 13120.2381046.63
  Firefox 57222.601104.00
2016
  Chrome Android 34188.2619954.79
  Firefox 1375.4631759.33
2017
  Chrome Android 17220.88111242.45
  Firefox 25184.282150.50
2018
  Chrome Android 38279.1315870.80
  Firefox 4171.50235.00
2019
  Chrome Android 50447.668658.00
  Firefox 0NaN3522.67
2020
  Firefox 28171.254234.50
  Chrome Android 28529.577978.57
2021
  Chrome Android 11593.643623.00
  Firefox 1483.500NaN
2022
  Chrome Android 18268.949776.67
2023
  Chrome Android 31402.617319.00
  Firefox 2122.503102.67
2024
  Chrome Android 34216.792140.00
  Firefox 11260.91128.00
2025
  Chrome Android 28134.005203.00
  Firefox 242228.660NaN
2026
  Firefox 156.000NaN

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 Firefox and Chrome Android. TTA (time to available).
Year JS countJS TTAHTML countHTML TTA
2004
  Chrome Android 3172787.003362804.93
2005
  Chrome Android 92402.0042402.00
2006
  Chrome Android 0NaN42386.25
2008
  Chrome Android 42384.5051471.00
2009
  Chrome Android 51093.00131093.00
2010
  Chrome Android 0NaN3888.00
2011
  Chrome Android 53531.1562575.56
2012
  Firefox 38826.4740929.65
  Chrome Android 25778.848194.38
2013
  Chrome Android 58564.6981253.63
  Firefox 57586.63151111.53
2014
  Firefox 51311.57111141.91
  Chrome Android 26340.352777.50
2015
  Firefox 13120.2381046.63
  Chrome Android 57222.601104.00
2016
  Firefox 34188.2619954.79
  Chrome Android 1375.4631759.33
2017
  Firefox 17220.88111242.45
  Chrome Android 25184.282150.50
2018
  Firefox 38279.1315870.80
  Chrome Android 4171.50235.00
2019
  Firefox 50447.668658.00
  Chrome Android 0NaN3522.67
2020
  Chrome Android 28171.254234.50
  Firefox 28529.577978.57
2021
  Firefox 11593.643623.00
  Chrome Android 1483.500NaN
2022
  Firefox 18268.949776.67
2023
  Firefox 31402.617319.00
  Chrome Android 2122.503102.67
2024
  Firefox 34216.792140.00
  Chrome Android 11260.91128.00
2025
  Firefox 28134.005203.00
  Chrome Android 242228.660NaN
2026
  Chrome Android 156.000NaN

Stable APIs

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

Raw Data

Quick Links:

HTML Data

API First Browser Date Last Browser Date Days Notes
html.elements.a 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Starting with Firefox 41, <a> without href attribute is no longer classified as interactive content: clicking it inside <label> will activate labelled content (bug 1167816).Firefox for Android: Starting with Firefox for Android 41, <a> without href attribute is no longer classified as interactive content: clicking it inside <label> will activate labelled content (bug 1167816).
html.elements.a.charset 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.download 📋Chrome Android6/27/2012 Firefox4/2/2013279
Chrome: Starting in Chrome 65, cross-origin downloads are not supported on the <a> element.Chrome Android: Starting in Chrome Android 65, cross-origin downloads are not supported on the <a> element.Edge: Starting in Edge 79, cross-origin downloads are not supported on the <a> element.Edge: Until Edge 14 (build 14357), attempting to download data URIs caused Edge to crash (bug 7160092).Edge: Edge 17 or older didn't follow the attributes' value to determine filename (bug 7260192).Firefox for Android: The attribute's filename value only affects the suggested file name for the blob: and data: URI schemes. Other schemes ignore the suggested filename. See bug 1845642.Quest Browser: Starting in Quest Browser 5.0, cross-origin downloads are not supported on the <a> element.Opera: Starting in Opera 52, cross-origin downloads are not supported on the <a> element.Opera Android: Starting in Opera Android 47, cross-origin downloads are not supported on the <a> element.Samsung Internet: Starting in Samsung Internet 9.0, cross-origin downloads are not supported on the <a> element.WebView Android: Starting in WebView Android 65, cross-origin downloads are not supported on the <a> element.
html.elements.a.href 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.href.href_top Firefox1/31/2012 Chrome Android6/27/2012148
html.elements.a.hreflang 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.implicit_noopener Firefox7/28/2020 Chrome Android1/19/2021175
html.elements.a.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.ping 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: This property is exposed but has no effect if the browser.send_pings preference is not set to true. See bug 951104.Firefox for Android: This property is exposed but has no effect if the browser.send_pings preference is not set to true. See bug 951104.
html.elements.a.referrerpolicy 📋Chrome Android6/8/2016 Firefox11/15/2016160
html.elements.a.rel 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.rel.noopener 📋Chrome Android3/9/2016 Firefox3/7/2017363
Firefox: Before Firefox 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox 63, these windows have the same features enabled by default as any other window.Firefox for Android: Before Firefox for Android 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox for Android 63, these windows have the same features enabled by default as any other window.
html.elements.a.rel.noreferrer 📋Chrome Android6/27/2012 Firefox10/14/2014839
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)
html.elements.a.rev 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.target 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.a.text_fragments Chrome Android2/4/2020 Firefox10/1/20241701
html.elements.a.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.abbr 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.acronym 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.address 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.alt 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.coords 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.download 📋Firefox4/2/2013 Chrome Android10/19/20161296
html.elements.area.href 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.implicit_noopener Firefox7/28/2020 Chrome Android1/19/2021175
html.elements.area.nohref 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.ping 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: This property is exposed but has no effect if the browser.send_pings preference is not set to true. See bug 951104.Firefox for Android: This property is exposed but has no effect if the browser.send_pings preference is not set to true. See bug 951104.
html.elements.area.referrerpolicy 📋Chrome Android6/8/2016 Firefox11/15/2016160
html.elements.area.rel 📋Chrome Android6/27/2012 Firefox6/10/2014713
html.elements.area.rel.noopener 📋Chrome Android3/9/2016 Firefox3/7/2017363
Firefox: Before Firefox 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox 63, these windows have the same features enabled by default as any other window.Firefox for Android: Before Firefox for Android 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox for Android 63, these windows have the same features enabled by default as any other window.
html.elements.area.rel.noreferrer 📋Chrome Android6/27/2012 Firefox10/14/2014839
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)
html.elements.area.shape 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.area.target 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.article 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.aside 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.audio 📋Firefox6/30/2009 Chrome Android6/27/20121093
Firefox: For Firefox to play audio, the server must serve the file using the correct MIME type.Firefox for Android: For Firefox for Android to play audio, the server must serve the file using the correct MIME type.
html.elements.audio.controls 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.audio.crossorigin 📋Chrome Android2/26/2014 Firefox3/10/20202204
Firefox: With crossorigin="use-credentials", cookies aren't sent during seek. See bug 1532722.Firefox for Android: With crossorigin="use-credentials", cookies aren't sent during seek. See bug 1532722.
html.elements.audio.loop 📋Firefox3/13/2012 Chrome Android6/27/2012106
html.elements.audio.muted 📋Firefox3/13/2012 Chrome Android6/27/2012106
html.elements.audio.preload 📋Firefox3/22/2011 Chrome Android6/27/2012463
Chrome: Defaults to metadata in Chrome 64.Chrome Android: Defaults to metadata in Chrome Android 64.Quest Browser: Defaults to metadata in Quest Browser 5.0.Opera: Defaults to metadata in Opera 51.Opera Android: Defaults to metadata in Opera 51.Samsung Internet: Defaults to metadata in Samsung Internet 9.0.WebView Android: Defaults to metadata in Chrome 64.
html.elements.audio.src 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.b 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.base 📋Firefox11/9/2004 Chrome Android6/27/20122787
Internet Explorer: Before Internet Explorer 7, <base> can be positioned anywhere in the document and the nearest value of <base> is used.
html.elements.base.href 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.base.href.forbid_data_javascript_urls Chrome Android4/25/2017 Firefox6/11/20242604
html.elements.base.href.relative_url Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.base.target 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.bdi 📋Firefox1/31/2012 Chrome Android6/27/2012148
html.elements.bdo 📋Firefox1/31/2012 Chrome Android6/27/2012148
html.elements.big 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.blockquote 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.blockquote.cite Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.alink Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.background Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.bottommargin Chrome Android6/27/2012 Firefox1/13/2015930
Firefox: Before Firefox 35, it was supported in Quirks Mode only.Firefox for Android: Before Firefox for Android 35, it was supported in Quirks Mode only.
html.elements.body.leftmargin Chrome Android6/27/2012 Firefox1/13/2015930
Firefox: Before Firefox 35, it was supported in Quirks Mode only.Firefox for Android: Before Firefox for Android 35, it was supported in Quirks Mode only.
html.elements.body.link Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.rightmargin Chrome Android6/27/2012 Firefox1/13/2015930
Firefox: Before Firefox 35, it was supported in Quirks Mode only.Firefox for Android: Before Firefox for Android 35, it was supported in Quirks Mode only.
html.elements.body.text Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.body.topmargin Chrome Android6/27/2012 Firefox1/13/2015930
Firefox: Before Firefox 35, it was supported in Quirks Mode only.Firefox for Android: Before Firefox for Android 35, it was supported in Quirks Mode only.
html.elements.body.vlink Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.br 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.br.clear Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.button 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.button.command 📋Chrome Android4/1/2025 Firefox10/14/2025196
html.elements.button.command.request-close 📋Chrome Android8/5/2025 Firefox10/14/202570
html.elements.button.commandfor 📋Chrome Android4/1/2025 Firefox10/14/2025196
html.elements.button.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.button.form Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.formaction Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.formenctype Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.formmethod Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.formnovalidate Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.formtarget Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.button.name Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.button.popovertarget 📋Chrome Android5/30/2023 Firefox4/16/2024322
html.elements.button.popovertargetaction 📋Chrome Android5/30/2023 Firefox4/16/2024322
html.elements.button.type Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.button.value Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.canvas 📋Firefox11/29/2005 Chrome Android6/27/20122402
Firefox: Before Firefox 5, the canvas width and height were signed integers instead of unsigned integers.Firefox: Before Firefox 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox: Before Firefox 12, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Firefox for Android: Before Firefox for Android 5, the canvas width and height were signed integers instead of unsigned integers.Firefox for Android: Before Firefox for Android 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox for Android: Before Firefox for Android 14, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Safari: Although early versions of Apple's Safari browser don't require the closing tag, the specification indicates that it is required, so you should be sure to include it for broadest compatibility. Before version 2, Safari will render the content of the fallback in addition to the canvas itself unless you use CSS tricks to mask it.
html.elements.canvas.height 📋Firefox11/29/2005 Chrome Android6/27/20122402
Firefox: Before Firefox 5, the canvas width and height were signed integers instead of unsigned integers.Firefox: Before Firefox 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox: Before Firefox 12, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Firefox for Android: Before Firefox for Android 5, the canvas width and height were signed integers instead of unsigned integers.Firefox for Android: Before Firefox for Android 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox for Android: Before Firefox for Android 14, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Safari: Although early versions of Apple's Safari browser don't require the closing tag, the specification indicates that it is required, so you should be sure to include it for broadest compatibility. Before version 2, Safari will render the content of the fallback in addition to the canvas itself unless you use CSS tricks to mask it.
html.elements.canvas.width 📋Firefox11/29/2005 Chrome Android6/27/20122402
Firefox: Before Firefox 5, the canvas width and height were signed integers instead of unsigned integers.Firefox: Before Firefox 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox: Before Firefox 12, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Firefox for Android: Before Firefox for Android 5, the canvas width and height were signed integers instead of unsigned integers.Firefox for Android: Before Firefox for Android 6, a <canvas> element with a zero width or height would be rendered as if it had default dimensions.Firefox for Android: Before Firefox for Android 14, if JavaScript is disabled, the <canvas> element was being rendered instead of showing the fallback content as per the specification. Since then, the fallback content is rendered instead.Safari: Although early versions of Apple's Safari browser don't require the closing tag, the specification indicates that it is required, so you should be sure to include it for broadest compatibility. Before version 2, Safari will render the content of the fallback in addition to the canvas itself unless you use CSS tricks to mask it.
html.elements.caption 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.caption.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.center 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.Firefox for Android: Before Firefox for Android 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.cite 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.code 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.col 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.col.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.col.span 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.col.valign 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.col.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.colgroup 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.colgroup.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.colgroup.span 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.colgroup.valign 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.colgroup.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.data 📋Firefox6/25/2013 Chrome Android10/24/20171582
html.elements.data.value 📋Firefox6/25/2013 Chrome Android10/24/20171582
html.elements.datalist 📋Firefox3/22/2011 Chrome Android2/26/20141072
Firefox for Android: The dropdown menu containing available options does not appear. See bug 1535985.
html.elements.datalist.input_type_email 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.datalist.input_type_number 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.datalist.input_type_range 📋Chrome Android3/16/2017 Firefox2/14/20232161
html.elements.datalist.input_type_search 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.datalist.input_type_tel 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.datalist.input_type_text 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.datalist.input_type_url 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.dd 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element was implemented using the HTMLSpanElement interface instead of HTMLElement.
html.elements.del 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.del.cite Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.del.datetime Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.details 📋Chrome Android6/27/2012 Firefox9/20/20161546
Firefox: Before Firefox 57, there was a bug meaning that <details> elements can't be made open by default using the open attribute if they have a CSS animation active on them.Firefox for Android: There is a bug meaning that <details> elements can't be made open by default using the open attribute if they have a CSS animation active on them.
html.elements.details.name Chrome Android12/5/2023 Firefox9/3/2024273
html.elements.details.open Chrome Android6/27/2012 Firefox9/20/20161546
html.elements.details.search_match_opens Chrome Android1/4/2022 Firefox2/24/20261512
Firefox: The browser does not correctly scroll to the matching text. See bug 2006040.Firefox for Android: The browser does not correctly scroll to the matching text. See bug 2006040.Safari: The browser does not correctly scroll to the matching text. See bug 304174.Safari on iOS: The browser does not correctly scroll to the matching text. See bug 304174.WebView on iOS: The browser does not correctly scroll to the matching text. See bug 304174.
html.elements.dfn 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.dialog 📋Chrome Android9/3/2014 Firefox3/8/20222743
html.elements.dialog.closedby 📋Chrome Android3/4/2025 Firefox7/22/2025140
html.elements.dialog.open Chrome Android9/3/2014 Firefox3/8/20222743
html.elements.dir 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.dir.compact Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.div 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.div.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.dl 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.dt 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.em 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.height 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.src 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.embed.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.fieldset 📋Firefox11/9/2004 Chrome Android6/27/20122787
Chrome: Before version 86, this element did not support flexbox and grid layouts within this element. See bug 41027853.Chrome Android: Before version 86, this element did not support flexbox and grid layouts within this element. See bug 41027853.Edge: Before version 86, this element did not support flexbox and grid layouts within this element. See bug 4511145.Quest Browser: Before version 12.0, this element did not support flexbox and grid layouts within this element. See bug 41027853.Samsung Internet: Before version 14.0, this element did not support flexbox and grid layouts within this element. See bug 41027853.WebView Android: Before version 86, this element did not support flexbox and grid layouts within this element. See bug 41027853.
html.elements.fieldset.disabled 📋Firefox3/22/2011 Chrome Android2/27/2013708
Edge: Does not work with nested fieldsets. For example: <fieldset disabled><fieldset><!--Still enabled--></fieldset></fieldset>Internet Explorer: Not all form control descendants of a disabled fieldset are properly disabled in IE11; see IE bug 817488: input[type='file'] not disabled inside disabled fieldset and IE bug 962368: Can still edit input[type='text'] within fieldset[disabled].
html.elements.fieldset.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.fieldset.name 📋Firefox3/22/2011 Chrome Android2/27/2013708
html.elements.figcaption 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.figure 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.font 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.font.color Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.font.face Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.font.size Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.footer 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.accept-charset 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.action 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.autocomplete 📋Firefox3/22/2011 Chrome Android6/27/2012463
Chrome: The Google Chrome UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Chrome might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.Chrome Android: The Chrome Android UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Chrome Android might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.Quest Browser: The Quest Browser UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Quest Browser might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.Opera: The Opera UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Opera might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.Opera Android: The Opera Android UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Opera Android might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.Samsung Internet: The Samsung Internet UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, Samsung Internet might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.WebView Android: The WebView Android UI for auto-complete request varies, depending on whether autocomplete is set to off on <input> elements as well as their form. Specifically, when a form has autocomplete set to off and its <input> element's autocomplete attribute is not set, then if the user asks for autofill suggestions for the <input> element, WebView Android might display a message saying 'autocomplete has been disabled for this form.' On the other hand, if both the form and the input element have autocomplete set to off, the browser will not display that message. For this reason, you should set autocomplete to off for each <input> that has custom auto-completion.
html.elements.form.autocomplete.one-time-code Chrome Android7/27/2020 Firefox1/17/2023904
html.elements.form.autocomplete.webauthn 📋Chrome Android11/29/2022 Firefox1/23/2024420
html.elements.form.enctype 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.method 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.form.novalidate 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.form.rel 📋Chrome Android11/29/2022 Firefox3/14/2023105
html.elements.form.target 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.frameborder Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.marginheight Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.marginwidth Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.name Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.noresize Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.scrolling Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frame.src Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frameset 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frameset.cols Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.frameset.rows Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h1 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h2 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h3 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h4 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h5 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.h6 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.head 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.header 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.hgroup 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.hr 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.hr.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.hr.color Firefox11/9/2004 Chrome Android2/26/20143396
html.elements.hr.noshade Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.hr.size Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.hr.width Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.html 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.html.version 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.html.xmlns Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.i 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: The resize CSS property doesn't have any effect on this element due to bug 680823.Firefox for Android: The resize CSS property doesn't have any effect on this element due to bug 680823.Safari: Safari has a bug that prevents iframes from loading if the iframe element was hidden when added to the page. iframeElement.src = iframeElement.src should cause it to load the iframe.Safari on iOS: Safari on iOS has a bug that prevents iframes from loading if the iframe element was hidden when added to the page. iframeElement.src = iframeElement.src should cause it to load the iframe.WebView on iOS: WebView on iOS has a bug that prevents iframes from loading if the iframe element was hidden when added to the page. iframeElement.src = iframeElement.src should cause it to load the iframe.
html.elements.iframe.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.allow 📋Chrome Android8/1/2017 Firefox3/10/2020952
html.elements.iframe.allow.autoplay 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.camera 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.display-capture 📋Firefox3/10/2020 Chrome Android9/21/2021560
html.elements.iframe.allow.encrypted-media 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.fullscreen 📋Chrome Android10/24/2017 Firefox8/25/20201036
html.elements.iframe.allow.geolocation 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.microphone 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.midi 📋Chrome Android1/23/2018 Firefox3/10/2020777
html.elements.iframe.allow.payment 📋Chrome Android8/1/2017 Firefox3/10/2020952
html.elements.iframe.allow.publickey-credentials-get 📋Chrome Android7/27/2020 Firefox9/26/20231156
html.elements.iframe.allow.screen-wake-lock 📋Chrome Android7/27/2020 Firefox5/14/20241387
html.elements.iframe.allow.web-share 📋Firefox9/22/2020 Chrome Android10/20/202028
Firefox: Firefox recognizes the web-share permissions policy, but this has no effect in versions of Firefox that do not support the share() method.Firefox for Android: Firefox for Android recognizes the web-share permissions policy, but this has no effect in versions of Firefox for Android that do not support the share() method.
html.elements.iframe.allowfullscreen 📋Firefox1/8/2013 Chrome Android10/8/2014638
Safari on iOS: Only available on iPad, not on iPhone.Safari on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.WebView on iOS: Only available on iPad, not on iPhone.WebView on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.
html.elements.iframe.cross-origin-top-navigation-by-user-activation Chrome Android7/24/2018 Firefox10/14/20252639
Chrome: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Chrome Android: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Edge: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Firefox: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Firefox for Android: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Quest Browser: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Opera: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Opera Android: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.Safari: If a top-navigation is blocked, no redirect occurs, and an error is reported in the developer console.Safari on iOS: If a top-navigation is blocked, no redirect occurs, and an error is reported in the developer console.Samsung Internet: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.WebView Android: If a top-navigation is blocked, users are prompted for permission to redirect, and an error is reported in the developer console.WebView on iOS: If a top-navigation is blocked, no redirect occurs, and an error is reported in the developer console.
html.elements.iframe.frameborder 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.height 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.loading 📋Chrome Android9/10/2019 Firefox12/19/20231561
html.elements.iframe.longdesc 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.marginheight 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.marginwidth 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.referrerpolicy 📋Chrome Android6/8/2016 Firefox11/15/2016160
html.elements.iframe.sandbox 📋Chrome Android6/27/2012 Firefox11/20/2012146
html.elements.iframe.sandbox.allow-downloads 📋Chrome Android5/19/2020 Firefox10/20/2020154
html.elements.iframe.sandbox.allow-forms 📋Chrome Android6/27/2012 Firefox9/20/20161546
html.elements.iframe.sandbox.allow-modals 📋Chrome Android10/14/2015 Firefox9/20/2016342
html.elements.iframe.sandbox.allow-orientation-lock 📋Firefox9/20/2016 Chrome Android7/24/2018672
html.elements.iframe.sandbox.allow-popups 📋Chrome Android6/27/2012 Firefox3/18/2014629
html.elements.iframe.sandbox.allow-popups-to-escape-sandbox 📋Chrome Android10/14/2015 Firefox9/20/2016342
html.elements.iframe.sandbox.allow-presentation 📋Chrome Android9/7/2016 Firefox11/15/201669
html.elements.iframe.sandbox.allow-same-origin 📋Chrome Android6/27/2012 Firefox9/20/20161546
Chrome: Chrome 70 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Chrome Android: Chrome Android 70 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Edge: Edge 79 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Quest Browser: Quest Browser 6.0 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Opera: Opera 57 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Opera Android: Opera Android 49 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Safari: Safari blocks script execution without allow-scripts even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Safari on iOS: Safari blocks script execution without allow-scripts even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.Samsung Internet: Samsung Internet 10.0 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.WebView Android: WebView Android 70 and earlier block script execution without allow-scripts, even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.WebView on iOS: Safari blocks script execution without allow-scripts even if allow-same-origin is set. For example, any bound handlers for click events of nodes inside an iframe throw an error for blocked script execution.
html.elements.iframe.sandbox.allow-scripts 📋Chrome Android6/27/2012 Firefox9/20/20161546
html.elements.iframe.sandbox.allow-storage-access-by-user-activation Firefox1/29/2019 Chrome Android5/2/20231554
html.elements.iframe.sandbox.allow-top-navigation 📋Chrome Android6/27/2012 Firefox9/20/20161546
html.elements.iframe.sandbox.allow-top-navigation-by-user-activation 📋Chrome Android4/25/2017 Firefox7/28/20201190
html.elements.iframe.scrolling 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.src 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.iframe.srcdoc 📋Chrome Android2/27/2013 Firefox10/29/2013244
html.elements.iframe.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.alt 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.aspect_ratio_computed_from_attributes Firefox12/10/2019 Chrome Android12/17/20197
Safari: Safari doesn't preserve space for images without a valid src, which may disrupt layouts that rely on lazy loading (see bug 224197).Safari on iOS: Safari on iOS doesn't preserve space for images without a valid src, which may disrupt layouts that rely on lazy loading (see bug 224197).WebView on iOS: WebView on iOS doesn't preserve space for images without a valid src, which may disrupt layouts that rely on lazy loading (see bug 224197).
html.elements.img.border 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.crossorigin 📋Firefox11/8/2011 Chrome Android6/27/2012232
html.elements.img.decoding 📋Chrome Android3/6/2018 Firefox10/23/2018231
html.elements.img.fetchpriority 📋Chrome Android4/26/2022 Firefox10/29/2024917
html.elements.img.height 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.hspace 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.ismap 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.loading 📋Chrome Android9/10/2019 Firefox4/7/2020210
html.elements.img.longdesc 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.referrerpolicy 📋Chrome Android6/8/2016 Firefox11/15/2016160
html.elements.img.sizes 📋Chrome Android10/8/2014 Firefox5/12/2015216
html.elements.img.src 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.srcset 📋Chrome Android4/2/2014 Firefox5/12/2015405
html.elements.img.usemap 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.usemap.case_sensitive Firefox1/24/2017 Chrome Android4/25/201791
html.elements.img.vspace 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.img.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 89, manipulating the content of <input> elements using Document.execCommand() commands requires workarounds (see bug 1220696).Firefox for Android: Before Firefox for Android 89, manipulating the content of <input> elements using Document.execCommand() commands requires workarounds (see bug 1220696).
html.elements.input.accept 📋Firefox11/9/2004 Chrome Android6/27/20122787
Safari on iOS: Does not support audio/* MIME type. See bug 242110.WebView on iOS: Does not support audio/* MIME type. See bug 242110.
html.elements.input.align 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.alt 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.autocomplete 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.checked 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.dirname 📋Chrome Android6/27/2012 Firefox8/1/20234052
html.elements.input.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.formaction 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.formenctype 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.formmethod 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.formnovalidate 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.formtarget 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.max 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.input.maxlength 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.min 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.input.minlength 📋Chrome Android1/21/2015 Firefox1/24/2017734
html.elements.input.multiple 📋Firefox1/21/2010 Chrome Android6/27/2012888
html.elements.input.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.pattern 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.placeholder 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.popovertarget 📋Chrome Android5/30/2023 Firefox4/16/2024322
html.elements.input.popovertargetaction 📋Chrome Android5/30/2023 Firefox4/16/2024322
html.elements.input.readonly 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.required 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.size 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.src 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.step 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.input.type_button 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_checkbox 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_color 📋Chrome Android2/27/2013 Firefox4/29/2014426
Firefox for Android: Firefox for Android doesn't allow the user to choose a custom color, only one of the predefined ones.
html.elements.input.type_date 📋Chrome Android2/27/2013 Firefox11/14/20171721
html.elements.input.type_date.disables_invalid_values_in_picker_ui Chrome Android2/27/2013 Firefox11/14/20171721
html.elements.input.type_datetime-local 📋Chrome Android2/27/2013 Firefox10/5/20213142
Firefox: Only displays a date picker without a time picker, see bug 1726107 and bug 1726108.Firefox for Android: Only displays a date picker without a time picker, see bug 1726107 and bug 1726108.Safari: Safari only displays a date picker and does not display a time picker.
html.elements.input.type_email 📋Firefox11/9/2004 Chrome Android6/27/20122787
Safari on iOS: Doesn't do validation, but instead offers a custom 'email' keyboard, which is designed to make entering email addresses easier.Safari on iOS: The custom 'email' keyboard does not provide a comma key, so users cannot enter multiple email addresses.Safari on iOS: Automatically applies a default style of opacity: 0.4 to disable textual <input> elements, including those of type 'email'. Other major browsers don't currently share this particular default style.WebView on iOS: Doesn't do validation, but instead offers a custom 'email' keyboard, which is designed to make entering email addresses easier.WebView on iOS: The custom 'email' keyboard does not provide a comma key, so users cannot enter multiple email addresses.WebView on iOS: Automatically applies a default style of opacity: 0.4 to disable textual <input> elements, including those of type 'email'. Other major browsers don't currently share this particular default style.
html.elements.input.type_email.list 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.input.type_file 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: You can set as well as get the value of HTMLInputElement.files in all modern browsers; this was most recently added to Firefox, in version 57 (see bug 1384030).
html.elements.input.type_hidden 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_image 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_number 📋Chrome Android6/27/2012 Firefox4/29/2014671
Chrome: Prevents users from typing non-numeric content.Chrome Android: Prevents users from typing non-numeric content.Firefox: Allows users to type non-numeric content, with the value reflecting an empty string.Firefox for Android: Allows users to type non-numeric content, with the value reflecting an empty string.Quest Browser: Prevents users from typing non-numeric content.Opera: Prevents users from typing non-numeric content.Opera Android: Prevents users from typing non-numeric content.Safari: Allows users to type non-numeric content, with the value reflecting an empty string.Safari on iOS: Allows users to type non-numeric content, with the value reflecting an empty string.Samsung Internet: Prevents users from typing non-numeric content.WebView Android: Prevents users from typing non-numeric content.WebView on iOS: Allows users to type non-numeric content, with the value reflecting an empty string.
html.elements.input.type_number.list 📋Chrome Android2/26/2014 Firefox4/29/201462
html.elements.input.type_password 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_radio 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_range 📋Firefox8/6/2013 Chrome Android3/16/20171318
WebView Android: Pre-Chromium Android WebView recognizes the range type, but doesn't implement a range-specific control.
html.elements.input.type_range.labeled_values 📋Chrome Android3/16/2017 Firefox6/2/20201174
html.elements.input.type_range.list 📋Chrome Android3/16/2017 Firefox2/14/20232161
html.elements.input.type_range.tick_marks Chrome Android5/31/2018 Firefox1/17/20231692
html.elements.input.type_range.vertical_orientation Firefox11/21/2023 Chrome Android4/16/2024147
Chrome: Vertical orientation available via the writing-mode property (see Creating vertical controls).Chrome: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Chrome Android: Vertical orientation available via the writing-mode property (see Creating vertical controls).Chrome Android: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Edge: Vertical orientation available by setting the writing-mode: bt-lr style on the input element.Firefox: Vertical orientation available via the writing-mode property (see Creating vertical controls).Firefox: Supported using the non-standard orient="vertical" attribute.Firefox for Android: Vertical orientation available via the writing-mode property (see Creating vertical controls).Firefox for Android: Supported using the non-standard orient="vertical" attribute.Internet Explorer: Vertical orientation available by setting the writing-mode: bt-lr style on the input element.Quest Browser: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Opera: Vertical orientation available via the writing-mode property (see Creating vertical controls).Opera: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Opera Android: Vertical orientation available via the writing-mode property (see Creating vertical controls).Opera Android: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Safari: Vertical orientation available via the writing-mode property (see Creating vertical controls).Safari: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Safari on iOS: Vertical orientation available via the writing-mode property (see Creating vertical controls).Safari on iOS: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.Samsung Internet: Vertical orientation available via the writing-mode property (see Creating vertical controls).Samsung Internet: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.WebView Android: Vertical orientation available via the writing-mode property (see Creating vertical controls).WebView Android: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.WebView on iOS: Vertical orientation available via the writing-mode property (see Creating vertical controls).WebView on iOS: Vertical orientation available by setting the non-standard -webkit-appearance: slider-vertical style on the input element. You shouldn't use this, since it's proprietary, unless you include appropriate fallbacks for users of other browsers.
html.elements.input.type_reset 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Unlike other browsers, Firefox by default persists the dynamic disabled state of a <button> across page loads. Use the autocomplete attribute to control this feature.Firefox for Android: Unlike other browsers, Firefox for Android by default persists the dynamic disabled state of a <button> across page loads. Use the autocomplete attribute to control this feature.
html.elements.input.type_search 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.input.type_search.list 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.input.type_submit 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Unlike other browsers, Firefox by default persists the dynamic disabled state of a <button> across page loads. Use the autocomplete attribute to control this feature.Firefox for Android: Unlike other browsers, Firefox for Android by default persists the dynamic disabled state of a <button> across page loads. Use the autocomplete attribute to control this feature.
html.elements.input.type_tel 📋Firefox3/22/2011 Chrome Android6/27/2012463
Chrome: The field type doesn't demonstrate any special behavior.Safari: The field type doesn't demonstrate any special behavior.
html.elements.input.type_tel.list 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.input.type_text 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_text.list 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.input.type_time 📋Chrome Android2/27/2013 Firefox11/14/20171721
html.elements.input.type_url 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.type_url.list 📋Firefox3/22/2011 Chrome Android2/26/20141072
html.elements.input.usemap 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.input.webkitdirectory Firefox11/15/2016 Chrome Android1/14/20252982
Chrome Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).Chrome Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.Safari on iOS: Before version 18.4, the attribute can be set but users cannot choose a directory, only individual files (see bug 271705).WebView Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).WebView Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.WebView on iOS: Before version 18.4, the attribute can be set but users cannot choose a directory, only individual files (see bug 271705).
html.elements.ins 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ins.cite Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ins.datetime Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.kbd 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, creating a <kbd> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.label 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.label.for 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.legend 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.legend.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.li 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.li.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.li.value 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.as 📋Chrome Android4/13/2016 Firefox9/28/2017533
html.elements.link.charset 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.crossorigin 📋Firefox1/8/2013 Chrome Android4/2/2014449
Firefox: Before Firefox 83, crossorigin is not supported for rel="icon".Firefox for Android: Before Firefox for Android 83, crossorigin is not supported for rel="icon".
html.elements.link.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
Chrome: In Chrome and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Chrome Android: In Chrome Android and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Edge: Since Edge 79, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Quest Browser: In Quest Browser and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Opera: In Chrome and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Opera Android: In Chrome and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.Samsung Internet: In Samsung Internet and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.WebView Android: In WebView Android and other Blink-based browsers, adding the disabled attribute using JavaScript does not remove the stylesheet from document.styleSheets.
html.elements.link.fetchpriority 📋Chrome Android4/26/2022 Firefox10/29/2024917
html.elements.link.href 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.hreflang 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.imagesizes 📋Chrome Android3/12/2019 Firefox6/30/2020476
html.elements.link.imagesrcset 📋Chrome Android3/12/2019 Firefox6/30/2020476
html.elements.link.integrity 📋Chrome Android9/1/2015 Firefox12/15/2015105
html.elements.link.media 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.referrerpolicy 📋Chrome Android6/8/2016 Firefox11/15/2016160
html.elements.link.rel 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.rel.dns-prefetch 📋Chrome Android10/14/2015 Firefox6/11/20243163
Firefox: Only HTTP pages were supported.Firefox for Android: Only HTTP pages were supported.
html.elements.link.rel.icon Firefox10/24/2006 Chrome Android6/27/20122073
Chrome: If both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.).Edge: In version 79 and later (Blink-based Edge), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Firefox: Before Firefox 83, the crossorigin attribute is not supported for rel="icon".Firefox: The media attribute is not supported for rel="icon", see bug 1603885.Opera: In version 15 and later (Blink-based Opera), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Safari: If both ICO and PNG are available, will ALWAYS use ICO file, regardless of sizes set. (Per caniuse.com.)Safari on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)WebView on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)
html.elements.link.rel.modulepreload 📋Chrome Android4/17/2018 Firefox7/4/20231904
html.elements.link.rel.preconnect 📋Firefox7/2/2015 Chrome Android10/14/2015104
Firefox: Before Firefox 41, it doesn't obey the crossorigin attribute.Firefox for Android: Before Firefox for Android 41, it doesn't obey the crossorigin attribute.
html.elements.link.rel.prefetch 📋Firefox10/24/2006 Chrome Android6/27/20122073
Chrome: Requires secure contextChrome Android: Requires secure contextEdge: Requires secure contextFirefox: Requires secure contextFirefox for Android: Requires secure contextQuest Browser: Requires secure contextOpera: Requires secure contextOpera Android: Requires secure contextSamsung Internet: Requires secure contextWebView Android: Requires secure context
html.elements.link.rel.preload 📋Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rel.preload.as-fetch Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rel.preload.as-font Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rel.preload.as-image Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rel.preload.as-script Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rel.preload.as-style Chrome Android4/13/2016 Firefox1/26/20211749
Firefox: Disabled due to various web compatibility issues (e.g. bug 1405761).Firefox for Android: Disabled due to various web compatibility issues (e.g. bug 1405761).
html.elements.link.rev 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.sizes 📋Chrome Android6/27/2012 Firefox7/22/2014755
html.elements.link.target 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.link.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.main 📋Chrome Android4/3/2013 Firefox5/14/201341
html.elements.map 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 5, in Quirks Mode, empty maps were no longer skipped over in favor of non-empty ones when matching.Firefox: Before Firefox 17, the default styling of the <map> HTML element was display: block;. This is now display: inline; and matches the behavior of the other browsers. It was already the case in Quirks Mode.
html.elements.map.name Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.mark 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.marquee 📋Chrome Android6/27/2012 Firefox1/29/20192407
Firefox: Implements the HTMLDivElement interface.Firefox for Android: Implements the HTMLDivElement interface.
html.elements.marquee.behavior Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.direction Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.height Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.hspace Firefox6/17/2008 Chrome Android6/27/20121471
html.elements.marquee.loop Firefox6/17/2008 Chrome Android6/27/20121471
html.elements.marquee.scrollamount Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.scrolldelay Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.marquee.truespeed Firefox6/17/2008 Chrome Android6/27/20121471
html.elements.marquee.vspace Firefox6/17/2008 Chrome Android6/27/20121471
html.elements.marquee.width Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.menu 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.charset 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.content 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.http-equiv 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.http-equiv.content-language 📋Firefox11/9/2004 Chrome Android6/6/20174592
html.elements.meta.http-equiv.content-security-policy 📋Firefox11/9/2004 Chrome Android6/6/20174592
html.elements.meta.http-equiv.content-type 📋Firefox11/9/2004 Chrome Android6/6/20174592
html.elements.meta.http-equiv.refresh 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meta.name.color-scheme 📋Chrome Android4/7/2020 Firefox1/11/2022644
html.elements.meta.name.referrer 📋Chrome Android6/27/2012 Firefox2/24/2015972
Chrome: Until Chrome 46, content values weren't constrained to the values listed in the spec.Chrome Android: Until Chrome Android 46, content values weren't constrained to the values listed in the spec.Firefox: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox 39.Firefox for Android: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox for Android 39.Internet Explorer: Browsers initially supported an early draft of the specification which can only use a meta tag and is only compatible with the origin value from the new spec.Quest Browser: Until Quest Browser 5.0, content values weren't constrained to the values listed in the spec.Opera: Until Opera 33, content values weren't constrained to the values listed in the spec.Opera Android: Until Opera Android 33, content values weren't constrained to the values listed in the spec.Samsung Internet: Until Samsung Internet 5.0, content values weren't constrained to the values listed in the spec.WebView Android: Until WebView Android 46, content values weren't constrained to the values listed in the spec.
html.elements.meta.scheme 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.meter 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.high 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.low 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.max 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.min 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.optimum 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.meter.value 📋Chrome Android6/27/2012 Firefox10/9/2012104
html.elements.nav 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.nobr 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.noembed 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.noframes 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.noscript 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.archive 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.border 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.classid 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.codetype 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.data 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.declare 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.height 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.standby 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.usemap 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.object.width 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ol 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ol.compact Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ol.reversed 📋Chrome Android6/27/2012 Firefox1/8/2013195
html.elements.ol.start 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ol.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.optgroup 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.optgroup.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
Safari: Before Safari 7, the attribute can be set, but has no effect.Safari on iOS: The attribute can be set, but has no effect.WebView on iOS: The attribute can be set, but has no effect.
html.elements.optgroup.label 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.option 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.option.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.option.label 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before 77, Firefox didn't display the value of the label attribute as option text if element's content was empty. See bug 40545.Firefox: Historically, Firefox has allowed keyboard and mouse events to bubble up from the <option> element to the parent <select> element, although this behavior is inconsistent across many browsers. For better Web compatibility (and for technical reasons), they will not bubble up when Firefox is in multi-process mode and the <select> element is displayed as a drop-down list. The behavior is unchanged if the <select> is presented inline and it has either the multiple attribute defined or a size attribute set to more than 1. Rather than watching <option> elements for events, you should watch for change events on <select>. See bug 1090602 for details.Firefox: When Mozilla introduced dedicated content threads to Firefox (through the Electrolysis, or e10s, project), support for styling <option> elements was removed temporarily. Starting in Firefox 54, you can apply foreground and background colors to <option> elements again, using the color and background-color CSS properties. See bug 910022 for more information. Note that this is still disabled in Linux due to lack of contrast (see bug 1338283 for progress on this).Firefox for Android: Before 77, Firefox didn't display the value of the label attribute as option text if element's content was empty. See bug 40545.
html.elements.option.selected 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.option.value 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.output 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.output.for 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.output.form 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.output.name 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.p 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.param 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.param.name Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.param.type Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.param.value Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.param.valuetype Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.picture 📋Chrome Android10/8/2014 Firefox5/12/2015216
html.elements.plaintext 📋Firefox3/22/2011 Chrome Android6/27/2012463
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.pre 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.pre.width Firefox11/9/2004 Chrome Android6/27/20122787
Chrome: Specifying the width attribute has no layout effect.Chrome Android: Specifying the width attribute has no layout effect.Edge: Specifying the width attribute has no layout effect.Firefox: Since Firefox 29, specifying the width attribute has no layout effect.Firefox for Android: Since Firefox for Android 29, specifying the width attribute has no layout effect.Internet Explorer: Specifying the width attribute has no layout effect.Quest Browser: Specifying the width attribute has no layout effect.Opera: Specifying the width attribute has no layout effect.Opera Android: Specifying the width attribute has no layout effect.Safari: Specifying the width attribute has no layout effect.Safari on iOS: Specifying the width attribute has no layout effect.Samsung Internet: Specifying the width attribute has no layout effect.WebView Android: Specifying the width attribute has no layout effect.WebView on iOS: Specifying the width attribute has no layout effect.
html.elements.progress 📋Firefox8/16/2011 Chrome Android6/27/2012316
Firefox: Before Firefox 14, the <progress> element was incorrectly classified as a form element, and therefore had a form attribute. This has been fixed.Firefox: Firefox provides the ::-moz-progress-bar pseudo-element, which lets you style the part of the interior of the progress bar representing the amount of work completed so far.Firefox for Android: Before Firefox for Android 14, the <progress> element was incorrectly classified as a form element, and therefore had a form attribute. This has been fixed.Firefox for Android: Firefox for Android provides the ::-moz-progress-bar pseudo-element, which lets you style the part of the interior of the progress bar representing the amount of work completed so far.Safari on iOS: Safari on iOS does not support indeterminate progress bars (they are rendered like 0%-completed progress bars).WebView on iOS: WebView on iOS does not support indeterminate progress bars (they are rendered like 0%-completed progress bars).
html.elements.progress.max 📋Firefox8/16/2011 Chrome Android6/27/2012316
html.elements.progress.value 📋Firefox8/16/2011 Chrome Android6/27/2012316
html.elements.q 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.q.cite 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.rb 📋Chrome Android6/27/2012 Firefox5/12/20151049
Chrome: Blink has support for parsing the rb element, but not for rendering rb content as expected.Chrome Android: Blink has support for parsing the rb element, but not for rendering rb content as expected.Edge: Blink has support for parsing the rb element, but not for rendering rb content as expected.Quest Browser: Blink has support for parsing the rb element, but not for rendering rb content as expected.Opera: Blink has support for parsing the rb element, but not for rendering rb content as expected.Opera Android: Blink has support for parsing the rb element, but not for rendering rb content as expected.Safari: Safari has support for parsing the rb element, but not for rendering rb content as expected.Safari on iOS: Safari on iOS has support for parsing the rb element, but not for rendering rb content as expected.Samsung Internet: Blink has support for parsing the rb element, but not for rendering rb content as expected.WebView Android: Blink has support for parsing the rb element, but not for rendering rb content as expected.WebView on iOS: WebView on iOS has support for parsing the rb element, but not for rendering rb content as expected.
html.elements.rp 📋Chrome Android6/27/2012 Firefox5/12/20151049
html.elements.rt 📋Chrome Android6/27/2012 Firefox5/12/20151049
Chrome: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.Chrome Android: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.Quest Browser: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.Opera: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.Opera Android: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.Safari: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 265316.Safari on iOS: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 265316.Samsung Internet: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.WebView Android: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 347597919.WebView on iOS: Nested <rt> elements do not render correctly due to missing display: ruby-text styling. See bug 265316.
html.elements.rtc 📋Firefox10/14/2014 Chrome Android12/2/2015414
html.elements.ruby 📋Chrome Android6/27/2012 Firefox5/12/20151049
html.elements.s 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.samp 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.script 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Starting in Firefox 4, inserting <script> elements that have been created by calling document.createElement("script") no longer enforces execution in insertion order. This change lets Firefox properly abide by the specification. To make script-inserted external scripts execute in their insertion order, set .async=false on them.
html.elements.script.async 📋Firefox1/21/2010 Chrome Android6/27/2012888
html.elements.script.crossorigin 📋Firefox7/17/2012 Chrome Android2/27/2013225
Safari: The crossorigin attribute was implemented in WebKit in WebKit bug 81438.Safari on iOS: The crossorigin attribute was implemented in WebKit in WebKit bug 81438.WebView on iOS: The crossorigin attribute was implemented in WebKit in WebKit bug 81438.
html.elements.script.defer 📋Firefox6/30/2009 Chrome Android6/27/20121093
Chrome: Chrome does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348Chrome Android: Chrome Android does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348Firefox: Since Firefox 3.6, the defer attribute is ignored on scripts that don't have the src attribute. However, in Firefox 3.5 even inline scripts are deferred if the defer attribute is set.Internet Explorer: Before version 10, Internet Explorer implemented defer by a proprietary specification. Since version 10 it conforms to the W3C specification.Quest Browser: Quest Browser does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348Opera: Opera does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348Opera Android: Opera Android does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348Samsung Internet: Samsung Internet does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348WebView Android: WebView Android does not defer scripts with the defer attribute when the page is served as XHTML (application/xhtml+xml), see bug 41253514 and bug 41408348
html.elements.script.fetchpriority 📋Chrome Android4/26/2022 Firefox10/29/2024917
html.elements.script.integrity 📋Chrome Android9/1/2015 Firefox12/15/2015105
html.elements.script.nomodule 📋Chrome Android9/5/2017 Firefox5/9/2018246
html.elements.script.referrerpolicy 📋Chrome Android10/17/2018 Firefox1/29/2019104
html.elements.script.src 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.script.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.script.type.importmap 📋Chrome Android3/2/2021 Firefox12/13/2022651
html.elements.script.type.importmap.integrity 📋Chrome Android7/23/2024 Firefox4/29/2025280
html.elements.script.type.module Chrome Android9/5/2017 Firefox5/9/2018246
Chrome: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Chrome Android: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Edge: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Quest Browser: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Opera: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Opera Android: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.Safari: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).Safari on iOS: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).Samsung Internet: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.WebView Android: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.WebView on iOS: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).
html.elements.search 📋Firefox9/26/2023 Chrome Android10/10/202314
html.elements.section 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.select 📋Firefox11/9/2004 Chrome Android6/27/20122787
Chrome: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.Chrome Android: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.Firefox: Historically, Firefox has allowed keyboard and mouse events to bubble up from the <option> element to the parent <select> element, although this behavior is inconsistent across many browsers. For better Web compatibility (and for technical reasons), when Firefox is in multi-process mode the <select> element is displayed as a drop-down list. The behavior is unchanged if the <select> is presented inline and it has either the multiple attribute defined or a size attribute set to more than 1. Rather than watching <option> elements for events, you should watch for change events on <select>. See bug 1090602 for details.Firefox for Android: Firefox for Android, by default, sets a background-image gradient on all <select multiple> elements. This can be disabled using background-image: none.Quest Browser: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.Safari: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.Safari on iOS: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.Samsung Internet: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.WebView Android: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.WebView on iOS: border-radius on <select> elements is ignored unless -webkit-appearance is overridden to an appropriate value.
html.elements.select.autocomplete 📋Firefox3/13/2018 Chrome Android4/17/201835
html.elements.select.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.select.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.select.multiple 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.select.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.select.required 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.slot 📋Chrome Android9/7/2016 Firefox10/23/2018776
html.elements.slot.name Chrome Android9/7/2016 Firefox10/23/2018776
html.elements.small 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.source 📋Firefox6/30/2009 Chrome Android6/27/20121093
Firefox: Until Firefox 15, Firefox picked the first source element that has a type matching the MIME-type of a supported media format; see bug 449363 for details.Firefox for Android: Until Firefox for Android 15, Firefox for Android picked the first source element that has a type matching the MIME-type of a supported media format; see bug 449363 for details.
html.elements.source.height 📋Chrome Android4/13/2021 Firefox12/13/2022609
html.elements.source.media 📋Chrome Android6/27/2012 Firefox8/28/201262
Firefox: media is supported in <source> within <picture>, <audio>, and <video>. In Firefox 53-119, media is supported only in <source> within <picture>.Firefox for Android: media is supported in <source> within <picture>, <audio>, and <video>. In Firefox for Android 53-119, media is supported only in <source> within <picture>.
html.elements.source.sizes 📋Chrome Android10/8/2014 Firefox5/12/2015216
Chrome: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Chrome Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Opera: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Opera Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Samsung Internet: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).WebView Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).
html.elements.source.src 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.source.srcset 📋Chrome Android10/8/2014 Firefox5/12/2015216
Chrome: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Chrome Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Opera: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Opera Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).Samsung Internet: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).WebView Android: Supports a subset of the syntax for resolution switching (using the x descriptor), but not the full syntax that can be used with sizes (using the w descriptor).
html.elements.source.type 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.source.width 📋Chrome Android4/13/2021 Firefox12/13/2022609
html.elements.span 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.strike 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.Firefox for Android: Before Firefox for Android 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.strong 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, creating a <strong> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.style 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.style.media 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.style.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before 75, Firefox accepted any CSS media (MIME) type, with optional parameters. Starting in 75, this has been restricted to the string 'text/css', per the spec.
html.elements.sub 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.summary 📋Chrome Android6/27/2012 Firefox9/20/20161546
html.elements.summary.display_list_item Firefox9/20/2016 Chrome Android3/2/20211624
html.elements.sup 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.border Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.cellpadding Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.cellspacing Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.frame Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.rules Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.summary Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.table.width Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tbody 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tbody.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tbody.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tbody.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.abbr Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.axis Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.colspan Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.headers Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.rowspan Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.rowspan.rowspan_zero Firefox8/8/2017 Chrome Android3/6/2018210
html.elements.td.scope Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.td.width Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.template 📋Chrome Android4/3/2013 Firefox6/25/201383
html.elements.template.shadowrootclonable 📋Chrome Android4/16/2024 Firefox4/16/2024
html.elements.template.shadowrootdelegatesfocus 📋Firefox2/20/2024 Chrome Android3/19/202428
html.elements.template.shadowrootmode 📋Chrome Android3/7/2023 Firefox2/20/2024350
html.elements.template.shadowrootreferencetarget Chrome Android2/4/2025 Firefox3/24/2026413
html.elements.textarea 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 6, when a <textarea> was focused, the insertion point was placed at the end of the text by default. Other major browsers place the insertion point at the beginning of the text.Firefox: A default background-image gradient is applied to all <textarea> elements, which can be disabled using background-image: none.Firefox: Before Firefox 89, manipulating the content of <textarea> elements using Document.execCommand() commands requires workarounds (see bug 1220696).Firefox for Android: Before Firefox for Android 6, when a <textarea> was focused, the insertion point was placed at the end of the text by default. Other major browsers place the insertion point at the beginning of the text.Firefox for Android: A default background-image gradient is applied to all <textarea> elements, which can be disabled using background-image: none.Firefox for Android: Before Firefox for Android 89, manipulating the content of <textarea> elements using Document.execCommand() commands requires workarounds (see bug 1220696).Safari on iOS: Unlike other major browsers, a default style of opacity: 0.4 is applied to disabled <textarea> elements.WebView on iOS: Unlike other major browsers, a default style of opacity: 0.4 is applied to disabled <textarea> elements.
html.elements.textarea.autocomplete 📋Firefox3/13/2018 Chrome Android4/17/201835
html.elements.textarea.autocomplete.one-time-code Chrome Android7/27/2020 Firefox1/17/2023904
html.elements.textarea.cols 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.dirname 📋Chrome Android6/27/2012 Firefox8/1/20234052
html.elements.textarea.disabled 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.form 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.maxlength 📋Firefox3/22/2011 Chrome Android6/27/2012463
Safari: Before Safari 17, newline characters counted as two characters instead of one. See bug 249916.Safari on iOS: Before Safari on iOS 17, newline characters counted as two characters instead of one. See bug 249916.WebView on iOS: Before WebView on iOS 17, newline characters counted as two characters instead of one. See bug 249916.
html.elements.textarea.minlength 📋Chrome Android1/21/2015 Firefox1/24/2017734
html.elements.textarea.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.placeholder 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.textarea.placeholder.line_breaks Chrome Android7/16/2014 Firefox3/13/20181336
html.elements.textarea.readonly 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.required 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.textarea.rows 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.textarea.wrap 📋Firefox3/22/2011 Chrome Android6/27/2012463
html.elements.tfoot 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tfoot.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tfoot.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tfoot.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.abbr Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.axis Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.colspan Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.headers Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.rowspan Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.scope Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.th.width Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.thead 📋Firefox11/9/2004 Chrome Android6/27/20122787
Safari: Backgrounds applied to <thead> elements will be applied to each table cell, rather than the entire header. To mimic the behavior of other browsers, set the background-attachment CSS property to fixed.Safari on iOS: Backgrounds applied to <thead> elements will be applied to each table cell, rather than the entire header. To mimic the behavior of other browsers, set the background-attachment CSS property to fixed.WebView on iOS: Backgrounds applied to <thead> elements will be applied to each table cell, rather than the entire header. To mimic the behavior of other browsers, set the background-attachment CSS property to fixed.
html.elements.thead.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.thead.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.thead.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.time 📋Firefox6/25/2013 Chrome Android10/24/20171582
html.elements.time.datetime Firefox6/25/2013 Chrome Android10/24/20171582
html.elements.title 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tr 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tr.align Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tr.bgcolor Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.tr.valign Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.track 📋Chrome Android2/27/2013 Firefox7/22/2014510
Chrome Android: Doesn't work for fullscreen video.Quest Browser: Doesn't work for fullscreen video.Samsung Internet: Doesn't work for fullscreen video.WebView Android: Doesn't work for fullscreen video.
html.elements.track.default 📋Chrome Android2/27/2013 Firefox7/22/2014510
html.elements.track.kind 📋Chrome Android2/27/2013 Firefox7/22/2014510
html.elements.track.label 📋Chrome Android2/27/2013 Firefox7/22/2014510
html.elements.track.src 📋Chrome Android2/27/2013 Firefox11/15/20161357
Firefox: Before Firefox 50, setting the src didn't work, though it didn't raise an error.Firefox for Android: Before Firefox for Android 50, setting the src didn't work, though it didn't raise an error.
html.elements.track.srclang 📋Chrome Android2/27/2013 Firefox7/22/2014510
html.elements.tt 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.Firefox for Android: Before Firefox for Android 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.u 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.ul 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ul.compact 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.ul.type 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.var 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.video 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.video.aspect_ratio_computed_from_attributes Firefox12/10/2019 Chrome Android12/17/20197
html.elements.video.autoplay 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.video.autoplay.requires_muted_audio Chrome Android5/31/2018 Firefox5/21/2019355
Firefox for Android: Between versions 79 and 91, the default behavior was to block videos from autoplaying, regardless of whether audio was muted.
html.elements.video.controls 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.video.crossorigin 📋Chrome Android2/26/2014 Firefox3/10/20202204
Firefox: With crossorigin="use-credentials", cookies aren't sent during seek. See bug 1532722.Firefox for Android: With crossorigin="use-credentials", cookies aren't sent during seek. See bug 1532722.
html.elements.video.disablepictureinpicture 📋Chrome Android9/2/2022 Firefox1/23/2024508
Firefox: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox for Android: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox for Android: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.
html.elements.video.height 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.video.loop 📋Firefox3/13/2012 Chrome Android6/27/2012106
html.elements.video.muted 📋Firefox3/13/2012 Chrome Android10/2/2013568
html.elements.video.poster 📋Firefox1/21/2010 Chrome Android6/27/2012888
html.elements.video.preload 📋Firefox3/22/2011 Chrome Android6/27/2012463
Chrome: Defaults to metadata in Chrome 64.Chrome Android: Defaults to metadata in Chrome Android 64.Quest Browser: Defaults to metadata in Quest Browser 5.0.Opera: Defaults to metadata in Opera 51.Opera Android: Defaults to metadata in Opera Android 47.Samsung Internet: Defaults to metadata in Samsung Internet 9.0.WebView Android: Defaults to metadata in WebView Android 64.
html.elements.video.src 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.video.width 📋Firefox6/30/2009 Chrome Android6/27/20121093
html.elements.wbr 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.elements.xmp 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.Firefox for Android: Before Firefox for Android 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.global_attributes.accesskey 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.autocapitalize 📋Chrome Android5/27/2015 Firefox3/14/20232848
html.global_attributes.autofocus 📋Chrome Android12/17/2019 Firefox2/14/20231155
Chrome: Supported for the <button>, <input>, <select>, and <textarea> elements.Chrome Android: Supported for the <button>, <input>, <select>, and <textarea> elements.Edge: Supported for the <button>, <input>, <select>, and <textarea> elements.Firefox: Supported for the <button>, <input>, <select>, and <textarea> elements.Firefox for Android: Supported for the <button>, <input>, <select>, and <textarea> elements.Internet Explorer: Supported for the <button>, <input>, <select>, and <textarea> elements.Quest Browser: Supported for the <button>, <input>, <select>, and <textarea> elements.Opera: Supported for the <button>, <input>, <select>, and <textarea> elements.Opera Android: Supported for the <button>, <input>, <select>, and <textarea> elements.Safari: Supported for the <button>, <input>, <select>, and <textarea> elements.Safari on iOS: If there's no hardware keyboard connected, then the autofocus attribute has no effect (for example, the focus event doesn't fire and the element does not match the :focus selector).Samsung Internet: Supported for the <button>, <input>, <select>, and <textarea> elements.WebView Android: Supported for the <button>, <input>, <select>, and <textarea> elements.WebView on iOS: If there's no hardware keyboard connected, then the autofocus attribute has no effect (for example, the focus event doesn't fire and the element does not match the :focus selector).
html.global_attributes.class 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.contenteditable 📋Firefox6/17/2008 Chrome Android6/27/20121471
html.global_attributes.contenteditable.plaintext-only Chrome Android6/8/2016 Firefox3/4/20253191
html.global_attributes.data_attributes 📋Firefox8/16/2011 Chrome Android6/27/2012316
html.global_attributes.dir 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.draggable 📋Firefox10/24/2006 Chrome Android6/27/20122073
html.global_attributes.enterkeyhint 📋Chrome Android9/10/2019 Firefox11/2/2021784
html.global_attributes.exportparts 📋Chrome Android3/12/2019 Firefox1/7/2020301
html.global_attributes.hidden 📋Firefox3/22/2011 Chrome Android6/27/2012463
Safari: This attribute has no effect on <option> elements.Safari on iOS: This attribute has no effect on <option> elements.WebView on iOS: This attribute has no effect on <option> elements.
html.global_attributes.hidden.until-found 📋Chrome Android5/24/2022 Firefox2/24/20261372
Firefox: The browser does not correctly scroll to the matching text. See bug 2006040.Firefox for Android: The browser does not correctly scroll to the matching text. See bug 2006040.Safari: The browser does not correctly scroll to the matching text. See bug 304174.Safari on iOS: The browser does not correctly scroll to the matching text. See bug 304174.WebView on iOS: The browser does not correctly scroll to the matching text. See bug 304174.
html.global_attributes.id 📋Chrome Android6/27/2012 Firefox9/2/2014797
Firefox: id is a true global attribute only since Firefox 32.Firefox for Android: id is a true global attribute only since Firefox for Android 32.
html.global_attributes.inert 📋Chrome Android5/24/2022 Firefox4/11/2023322
html.global_attributes.inert.ignores_find_in_page 📋Firefox11/21/2023 Chrome Android4/16/2024147
html.global_attributes.inputmode 📋Chrome Android4/17/2018 Firefox12/7/20211330
Safari on iOS: Before iOS 13, inputmode="none" had no effect.WebView on iOS: Before iOS 13, inputmode="none" had no effect.
html.global_attributes.is 📋Chrome Android5/31/2018 Firefox10/23/2018145
html.global_attributes.lang 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.nonce 📋Firefox7/22/2014 Chrome Android9/5/20171141
html.global_attributes.nonce.nonce_hiding 📋Chrome Android9/5/2017 Firefox4/7/2020945
html.global_attributes.part 📋Chrome Android3/12/2019 Firefox1/7/2020301
html.global_attributes.popover 📋Chrome Android5/30/2023 Firefox4/16/2024322
html.global_attributes.slot 📋Chrome Android9/7/2016 Firefox10/23/2018776
html.global_attributes.spellcheck 📋Firefox10/24/2006 Chrome Android12/2/20153326
Chrome Android: Only supported on <textarea>.Firefox for Android: Only supported on <textarea>.Opera Android: Only supported on <textarea>.Safari on iOS: Only supported on <textarea>.Samsung Internet: Only supported on <textarea>.WebView Android: Only supported on <textarea>.WebView on iOS: Only supported on <textarea>.
html.global_attributes.style 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.tabindex 📋Firefox11/29/2005 Chrome Android6/27/20122402
html.global_attributes.title 📋Firefox11/9/2004 Chrome Android6/27/20122787
html.global_attributes.title.multi-line_titles Chrome Android1/23/2018 Firefox1/23/2018
html.global_attributes.translate 📋Chrome Android2/27/2013 Firefox3/14/20233667

JS Data

API First Browser Date Last Browser Date Days Notes
javascript.builtins.AggregateError 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.builtins.AggregateError.AggregateError 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.builtins.AggregateError.errors 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.builtins.AggregateError.serializable_object Chrome Android2/1/2022 Firefox7/26/2022175
Chrome: AggregateError serializes to the Error type, without additional properties.Chrome Android: AggregateError serializes to the Error type, without additional properties.Edge: AggregateError serializes to the Error type, without additional properties.Firefox: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Firefox for Android: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Quest Browser: AggregateError serializes to the Error type, without additional properties.Opera: AggregateError serializes to the Error type, without additional properties.Opera Android: AggregateError serializes to the Error type, without additional properties.Samsung Internet: AggregateError serializes to the Error type, without additional properties.WebView Android: AggregateError serializes to the Error type, without additional properties.
javascript.builtins.Array 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.@@iterator 📋Chrome Android10/8/2014 Firefox2/24/2015139
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 Android6/8/2016 Firefox8/2/201655
javascript.builtins.Array.@@unscopables 📋Chrome Android10/8/2014 Firefox8/2/2016664
javascript.builtins.Array.Array 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.at 📋Firefox7/13/2021 Chrome Android7/20/20217
javascript.builtins.Array.concat 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.copyWithin 📋Firefox9/2/2014 Chrome Android9/1/2015364
javascript.builtins.Array.entries 📋Firefox3/18/2014 Chrome Android10/8/2014204
javascript.builtins.Array.every 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.fill 📋Firefox7/22/2014 Chrome Android9/1/2015406
javascript.builtins.Array.filter 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.find 📋Firefox10/29/2013 Chrome Android9/1/2015672
javascript.builtins.Array.findIndex 📋Firefox10/29/2013 Chrome Android9/1/2015672
javascript.builtins.Array.findLast 📋Chrome Android1/4/2022 Firefox8/23/2022231
javascript.builtins.Array.findLastIndex 📋Chrome Android1/4/2022 Firefox8/23/2022231
javascript.builtins.Array.flat 📋Chrome Android9/4/2018 Firefox9/5/20181
javascript.builtins.Array.flatMap 📋Chrome Android9/4/2018 Firefox9/5/20181
javascript.builtins.Array.forEach 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.from 📋Firefox9/2/2014 Chrome Android9/1/2015364
javascript.builtins.Array.fromAsync 📋Firefox7/4/2023 Chrome Android1/23/2024203
javascript.builtins.Array.includes 📋Chrome Android12/2/2015 Firefox12/15/201513
javascript.builtins.Array.indexOf 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.isArray 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Array.join 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.keys 📋Firefox3/18/2014 Chrome Android10/8/2014204
javascript.builtins.Array.lastIndexOf 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.length 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.map 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.of 📋Firefox10/29/2013 Chrome Android11/12/2014379
javascript.builtins.Array.pop 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.push 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.reduce 📋Firefox6/17/2008 Chrome Android6/27/20121471
javascript.builtins.Array.reduceRight 📋Firefox6/17/2008 Chrome Android6/27/20121471
javascript.builtins.Array.reverse 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.shift 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.slice 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.some 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.builtins.Array.sort 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.sort.stable_sorting Firefox6/17/2008 Chrome Android10/17/20183774
javascript.builtins.Array.splice 📋Firefox11/9/2004 Chrome Android6/27/20122787
Internet Explorer: From Internet Explorer 5.5 through 8, all elements of the array will not be deleted if deleteCount is omitted. This behavior was fixed in Internet Explorer 9.
javascript.builtins.Array.toLocaleString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.toLocaleString.locales_parameter Chrome Android2/27/2013 Firefox3/7/20171469
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 Android2/27/2013 Firefox3/7/20171469
javascript.builtins.Array.toReversed 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toSorted 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toSpliced 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.Array.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.unshift 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Array.values 📋Chrome Android4/17/2018 Firefox5/9/201822
javascript.builtins.Array.with 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.ArrayBuffer 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.ArrayBuffer.@@species 📋Chrome Android6/8/2016 Firefox8/2/201655
javascript.builtins.ArrayBuffer.ArrayBuffer 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.ArrayBuffer.ArrayBuffer.maxByteLength_option 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.byteLength 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.ArrayBuffer.detached 📋Chrome Android5/30/2023 Firefox1/23/2024238
javascript.builtins.ArrayBuffer.isView 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.ArrayBuffer.maxByteLength 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.resizable 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.resize 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.ArrayBuffer.slice 📋Firefox4/24/2012 Chrome Android6/27/201264
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 Android5/30/2023 Firefox1/23/2024238
javascript.builtins.ArrayBuffer.transferToFixedLength 📋Chrome Android5/30/2023 Firefox1/23/2024238
javascript.builtins.AsyncDisposableStack 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.@@asyncDispose 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.AsyncDisposableStack 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.adopt 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.defer 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.disposeAsync 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.disposed 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.move 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncDisposableStack.use 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncFunction 📋Chrome Android12/6/2016 Firefox3/7/201791
javascript.builtins.AsyncFunction.AsyncFunction 📋Chrome Android12/6/2016 Firefox3/7/201791
javascript.builtins.AsyncGenerator 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncGenerator.next 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncGenerator.return 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncGenerator.throw 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncGeneratorFunction 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncGeneratorFunction.AsyncGeneratorFunction 📋Firefox8/8/2017 Chrome Android12/5/2017119
javascript.builtins.AsyncIterator 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.builtins.AsyncIterator.@@asyncDispose 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.AsyncIterator.@@asyncIterator 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.builtins.Atomics 📋Firefox6/30/2020 Chrome Android3/2/2021245
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 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.and 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.compareExchange 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.exchange 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.isLockFree 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.load 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.notify 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.or 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.pause 📋Chrome Android2/4/2025 Firefox4/1/202556
javascript.builtins.Atomics.store 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.sub 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.wait 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.Atomics.waitAsync 📋Chrome Android4/13/2021 Firefox11/11/20251673
Chrome: The Atomics.waitAsync() method never times out. See bug 40742782.Chrome Android: The Atomics.waitAsync() method never times out. See bug 40742782.Edge: The Atomics.waitAsync() method never times out. See bug 40742782.Quest Browser: The Atomics.waitAsync() method never times out. See bug 40742782.Opera Android: The Atomics.waitAsync() method never times out. See bug 40742782.WebView Android: The Atomics.waitAsync() method never times out. See bug 40742782.
javascript.builtins.Atomics.xor 📋Firefox6/30/2020 Chrome Android3/2/2021245
javascript.builtins.BigInt 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.BigInt 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.asIntN 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.asUintN 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.toLocaleString 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.toLocaleString.locales_parameter Chrome Android7/30/2019 Firefox10/22/201984
Deno: Only the locale data for en-US is available.
javascript.builtins.BigInt.toLocaleString.options_parameter Chrome Android7/30/2019 Firefox10/22/201984
javascript.builtins.BigInt.toString 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt.valueOf 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt64Array 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigInt64Array.BigInt64Array 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigUint64Array 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.BigUint64Array.BigUint64Array 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.Boolean 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Boolean.Boolean 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Boolean.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Boolean.valueOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.DataView 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.DataView 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.DataView.sharedarraybuffer_support Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.DataView.buffer 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.byteLength 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.byteOffset 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getBigInt64 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.DataView.getBigUint64 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.DataView.getFloat16 📋Firefox8/6/2024 Chrome Android4/1/2025238
javascript.builtins.DataView.getFloat32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getFloat64 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getInt16 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getInt32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getInt8 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getUint16 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getUint32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.getUint8 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setBigInt64 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.DataView.setBigUint64 📋Chrome Android5/31/2018 Firefox7/9/2019404
javascript.builtins.DataView.setFloat16 📋Firefox8/6/2024 Chrome Android4/1/2025238
javascript.builtins.DataView.setFloat32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setFloat64 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setInt16 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setInt32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setInt8 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setUint16 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setUint32 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.DataView.setUint8 📋Chrome Android6/27/2012 Firefox8/28/201262
javascript.builtins.Date 📋Firefox11/9/2004 Chrome Android6/27/20122787
Internet Explorer: The ISO8601 Date Format is not supported in Internet Explorer 8 or earlier.
javascript.builtins.Date.@@toPrimitive 📋Chrome Android12/2/2015 Firefox1/26/201655
javascript.builtins.Date.Date 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.UTC 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.UTC.optional_monthIndex Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Date.getDate 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getDay 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getFullYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getHours 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getMilliseconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getMinutes 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getMonth 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getSeconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getTime 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getTimezoneOffset 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCDate 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCDay 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCFullYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCHours 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCMilliseconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCMinutes 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCMonth 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getUTCSeconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.getYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.now 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.parse 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.parse.iso_8601 Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Date.setDate 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setFullYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setHours 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setMilliseconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setMinutes 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setMonth 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setSeconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setTime 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCDate 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCFullYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCHours 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCMilliseconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCMinutes 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCMonth 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setUTCSeconds 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.setYear 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toDateString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toGMTString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toISOString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toJSON 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toLocaleDateString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toLocaleDateString.iana_time_zone_names Chrome Android2/27/2013 Firefox3/7/20171469
javascript.builtins.Date.toLocaleDateString.locales_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Date.toLocaleString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toLocaleString.iana_time_zone_names Chrome Android2/27/2013 Firefox3/7/20171469
javascript.builtins.Date.toLocaleString.locales_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Date.toLocaleTimeString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toLocaleTimeString.iana_time_zone_names Chrome Android2/27/2013 Firefox3/7/20171469
javascript.builtins.Date.toLocaleTimeString.locales_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Date.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toTemporalInstant 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Date.toTimeString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.toUTCString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Date.valueOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.DisposableStack 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.@@dispose 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.DisposableStack 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.adopt 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.defer 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.dispose 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.disposed 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.move 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.DisposableStack.use 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.Error 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Error.Error 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Error.Error.options_cause_parameter 📋Firefox8/10/2021 Chrome Android8/31/202121
javascript.builtins.Error.captureStackTrace 📋Chrome Android6/27/2012 Firefox4/29/20254689
javascript.builtins.Error.cause 📋Firefox8/10/2021 Chrome Android8/31/202121
Chrome: Before version 125, default console logging for Error objects does not print the cause.Chrome Android: Before version 125, default console logging for Error objects does not print the cause.Edge: Before version 125, default console logging for Error objects does not print the cause.Quest Browser: Before version false, default console logging for Error objects does not print the cause.Opera: Before version 111, default console logging for Error objects does not print the cause.Opera Android: Before version 83, default console logging for Error objects does not print the cause.Safari: Default console logging for Error objects does not print the cause.Safari on iOS: Default console logging for Error objects does not print the cause.Samsung Internet: Before version 27.0, default console logging for Error objects does not print the cause.WebView Android: Before version 125, default console logging for Error objects does not print the cause.WebView on iOS: Default console logging for Error objects does not print the cause.
javascript.builtins.Error.isError 📋Chrome Android3/4/2025 Firefox4/29/202556
Node.js: Returns false for DOMException instances. See issue 56497.Safari: Returns false for DOMException instances.Safari on iOS: Returns false for DOMException instances.WebView on iOS: Returns false for DOMException instances.
javascript.builtins.Error.message 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Error.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Error.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Error.stack Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Error.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.EvalError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.EvalError.EvalError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.EvalError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.FinalizationRegistry 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.FinalizationRegistry 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.register 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.FinalizationRegistry.register.symbol_as_target Chrome Android1/10/2023 Firefox12/9/20251064
javascript.builtins.FinalizationRegistry.unregister 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.Float16Array 📋Firefox8/6/2024 Chrome Android4/1/2025238
javascript.builtins.Float16Array.Float16Array 📋Firefox8/6/2024 Chrome Android4/1/2025238
javascript.builtins.Float32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Float32Array.Float32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Float32Array.Float32Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Float32Array.Float32Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Float64Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Float64Array.Float64Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Float64Array.Float64Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Float64Array.Float64Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Function 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.@@hasInstance 📋Chrome Android4/13/2016 Firefox11/15/2016216
javascript.builtins.Function.Function 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.apply 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.apply.generic_arrays_as_arguments Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Function.arguments Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.bind 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Function.call 📋Firefox11/9/2004 Chrome Android6/27/20122787
Node.js: When calling this method, thisArg does not default to the global object.
javascript.builtins.Function.caller Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.length 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.length.configurable_true Firefox3/31/2015 Chrome Android5/27/201557
javascript.builtins.Function.name 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.name.configurable_true Firefox5/12/2015 Chrome Android5/27/201515
javascript.builtins.Function.name.inferred_names Chrome Android6/8/2016 Firefox4/19/2017315
Edge: Names for functions defined in a dictionary are properly assigned; however, anonymous functions defined on a var/let variable assignment have blank names.
javascript.builtins.Function.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Function.toString.toString_revision Firefox6/13/2017 Chrome Android4/17/2018308
javascript.builtins.Generator 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.builtins.Generator.next 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.builtins.Generator.return 📋Firefox5/12/2015 Chrome Android4/13/2016337
javascript.builtins.Generator.throw 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.builtins.GeneratorFunction 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.builtins.GeneratorFunction.GeneratorFunction 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.builtins.Infinity 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Int16Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int16Array.Int16Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int16Array.Int16Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Int16Array.Int16Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Int32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int32Array.Int32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int32Array.Int32Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Int32Array.Int32Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Int8Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int8Array.Int8Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Int8Array.Int8Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Int8Array.Int8Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Intl 📋Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox8/8/20171623
javascript.builtins.Intl.Collator.Collator.options_collation_parameter Chrome Android10/20/2020 Firefox1/26/202198
javascript.builtins.Intl.Collator.Collator.options_ignorePunctuation_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator.Collator.options_localeMatcher_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator.Collator.options_numeric_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator.Collator.options_sensitivity_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator.Collator.options_usage_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.Collator.compare 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the DateTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.IntlLegacyConstructedSymbol 📋Firefox6/13/2017 Chrome Android5/25/20211442
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.locales_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter Chrome Android2/4/2020 Firefox5/5/202091
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter Chrome Android7/30/2019 Firefox7/28/2020364
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter Firefox7/13/2021 Chrome Android7/20/20217
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter Chrome Android7/27/2020 Firefox12/15/2020141
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter Firefox1/23/2018 Chrome Android3/12/2019413
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter Chrome Android2/4/2020 Firefox5/5/202091
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter Chrome Android7/30/2019 Firefox7/28/2020364
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values Firefox8/10/2021 Chrome Android10/19/202170
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones Chrome Android2/27/2013 Firefox3/7/20171469
javascript.builtins.Intl.DateTimeFormat.format 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android7/30/2019 Firefox8/10/2021742
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.formatRangeToParts 📋Chrome Android7/30/2019 Firefox8/10/2021742
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.formatToParts 📋Firefox1/24/2017 Chrome Android3/16/201751
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 Android2/27/2013 Firefox4/29/2014426
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 Android5/20/2014 Firefox4/19/20171065
javascript.builtins.Intl.DateTimeFormat.supportedLocalesOf 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.DisplayNames 📋Chrome Android4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.of 📋Chrome Android4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.resolvedOptions 📋Chrome Android4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DisplayNames.supportedLocalesOf 📋Chrome Android4/7/2020 Firefox2/23/2021322
javascript.builtins.Intl.DurationFormat 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.DurationFormat 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.format 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.formatToParts 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.resolvedOptions 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋Chrome Android9/17/2024 Firefox3/4/2025168
javascript.builtins.Intl.ListFormat 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.ListFormat 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the ListFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.format 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.formatToParts 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.resolvedOptions 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.supportedLocalesOf 📋Chrome Android1/29/2019 Firefox6/30/2020518
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.Locale 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.Locale 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.baseName 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.calendar 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.caseFirst 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.collation 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.hourCycle 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.language 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.maximize 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.minimize 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.numberingSystem 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.numeric 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.region 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.script 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.Locale.toString 📋Chrome Android4/24/2019 Firefox4/7/2020349
javascript.builtins.Intl.NumberFormat 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol 📋Firefox6/13/2017 Chrome Android5/25/20211442
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.
javascript.builtins.Intl.NumberFormat.NumberFormat.locales_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter Firefox11/3/2015 Chrome Android9/10/20191407
Safari: Doesn't support currencyDisplay: 'narrowSymbol'.Safari on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.WebView on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencySign_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter Chrome Android2/27/2013 Firefox5/5/20202624
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter Chrome Android2/27/2013 Firefox4/29/2014426
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter Chrome Android9/10/2019 Firefox6/30/2020294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter Chrome Android2/27/2013 Firefox4/29/2014426
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 Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.format 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatRange 📋Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatRangeToParts 📋Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.NumberFormat.formatToParts 📋Chrome Android1/23/2018 Firefox1/23/2018
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.NumberFormat.resolvedOptions 📋Chrome Android2/27/2013 Firefox4/29/2014426
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 Android2/27/2013 Firefox4/29/2014426
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 Android12/5/2017 Firefox1/23/201849
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 Android12/5/2017 Firefox1/23/201849
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 Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingMode_parameter Firefox8/1/2023 Chrome Android9/12/202342
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingPriority_parameter Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.resolvedOptions 📋Chrome Android12/5/2017 Firefox1/23/201849
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 Android12/5/2017 Firefox1/23/201849
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 📋Chrome Android9/27/2022 Firefox8/1/2023308
javascript.builtins.Intl.PluralRules.supportedLocalesOf 📋Chrome Android12/5/2017 Firefox1/23/201849
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 Android12/4/2018 Firefox1/29/201956
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat 📋Chrome Android12/4/2018 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.locales_parameter Chrome Android12/4/2018 Firefox1/29/201956
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the RelativeTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_localeMatcher_parameter Chrome Android12/4/2018 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numberingSystem_parameter Chrome Android12/4/2018 Firefox5/5/2020518
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numeric_parameter Chrome Android12/4/2018 Firefox1/29/201956
javascript.builtins.Intl.RelativeTimeFormat.format 📋Chrome Android12/4/2018 Firefox1/29/201956
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.formatToParts 📋Chrome Android12/4/2018 Firefox10/22/2019322
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.resolvedOptions 📋Chrome Android12/4/2018 Firefox1/29/201956
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.supportedLocalesOf 📋Chrome Android12/4/2018 Firefox1/29/201956
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.Segmenter 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.Segmenter 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.resolvedOptions 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.segment 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segmenter.supportedLocalesOf 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments.@@iterator 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.Segments.containing 📋Chrome Android11/17/2020 Firefox4/16/20241246
javascript.builtins.Intl.getCanonicalLocales 📋Firefox8/2/2016 Chrome Android10/19/201678
javascript.builtins.Intl.supportedValuesOf 📋Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_calendar Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_collation Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_currency Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_numberingSystem Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_timeZone Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Intl.supportedValuesOf.key_parameter_unit Firefox10/5/2021 Chrome Android3/1/2022147
javascript.builtins.Iterator 📋Firefox11/20/2012 Chrome Android10/8/2014687
javascript.builtins.Iterator.@@dispose 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.Iterator.@@iterator 📋Chrome Android10/8/2014 Firefox2/24/2015139
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 Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.concat 📋Firefox1/13/2026 Chrome Android3/10/202656
javascript.builtins.Iterator.drop 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.every 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.filter 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.find 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.flatMap 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.forEach 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.from 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.map 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.reduce 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.some 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.take 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.Iterator.toArray 📋Chrome Android2/20/2024 Firefox10/1/2024224
javascript.builtins.JSON 📋Firefox6/30/2009 Chrome Android6/27/20121093
javascript.builtins.JSON.isRawJSON 📋Chrome Android5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.json_superset Chrome Android4/17/2018 Firefox9/5/2018141
javascript.builtins.JSON.parse 📋Firefox6/30/2009 Chrome Android6/27/20121093
javascript.builtins.JSON.parse.reviver_parameter_context_argument 📋Chrome Android5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.rawJSON 📋Chrome Android5/30/2023 Firefox2/4/2025616
javascript.builtins.JSON.stringify 📋Firefox6/30/2009 Chrome Android6/27/20121093
javascript.builtins.JSON.stringify.well_formed_stringify Firefox12/11/2018 Chrome Android1/29/201949
javascript.builtins.Map 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.@@iterator 📋Chrome Android10/8/2014 Firefox2/24/2015139
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Map.@@species 📋Firefox9/22/2015 Chrome Android6/8/2016260
javascript.builtins.Map.Map 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.Map.iterable_allowed Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.Map.null_allowed Chrome Android10/8/2014 Firefox3/31/2015174
javascript.builtins.Map.clear 📋Firefox2/19/2013 Chrome Android10/8/2014596
javascript.builtins.Map.delete 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.entries 📋Firefox4/2/2013 Chrome Android10/8/2014554
javascript.builtins.Map.forEach 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Map.get 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.getOrInsert 📋Firefox10/14/2025 Chrome Android2/10/2026119
javascript.builtins.Map.getOrInsertComputed 📋Firefox10/14/2025 Chrome Android2/10/2026119
javascript.builtins.Map.groupBy 📋Chrome Android9/12/2023 Firefox10/24/202342
javascript.builtins.Map.has 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Map.key_equality_for_zeros Firefox4/29/2014 Chrome Android10/8/2014162
javascript.builtins.Map.keys 📋Firefox4/2/2013 Chrome Android10/8/2014554
javascript.builtins.Map.set 📋Firefox6/5/2012 Chrome Android10/8/2014855
Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.Map.size 📋Firefox2/19/2013 Chrome Android10/8/2014596
Firefox: From Firefox 13 to Firefox 18, the size property was implemented as a Map.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.Firefox for Android: From Firefox for Android 14 to Firefox for Android 18, the size property was implemented as a Map.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.
javascript.builtins.Map.values 📋Firefox4/2/2013 Chrome Android10/8/2014554
javascript.builtins.Math 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.E 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.LN10 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.LN2 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.LOG10E 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.LOG2E 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.PI 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.SQRT1_2 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.SQRT2 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.abs 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.acos 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.acosh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.asin 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.asinh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.atan 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.atan2 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.atanh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.cbrt 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.ceil 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.clz32 📋Firefox7/22/2014 Chrome Android10/8/201478
javascript.builtins.Math.cos 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.cosh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.exp 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.expm1 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.f16round 📋Firefox8/6/2024 Chrome Android4/1/2025238
javascript.builtins.Math.floor 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.fround 📋Firefox12/10/2013 Chrome Android10/8/2014302
javascript.builtins.Math.hypot 📋Firefox2/4/2014 Chrome Android10/8/2014246
javascript.builtins.Math.imul 📋Firefox4/2/2013 Chrome Android7/10/201399
javascript.builtins.Math.log 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.log10 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.log1p 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.log2 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.max 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.min 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.pow 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.random 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.round 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.sign 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.sin 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.sinh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.sqrt 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.tan 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Math.tanh 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Math.trunc 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.NaN 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.EPSILON 📋Firefox10/29/2013 Chrome Android4/2/2014155
javascript.builtins.Number.MAX_SAFE_INTEGER 📋Chrome Android4/2/2014 Firefox7/22/2014111
javascript.builtins.Number.MAX_VALUE 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.MIN_SAFE_INTEGER 📋Chrome Android4/2/2014 Firefox7/22/2014111
javascript.builtins.Number.MIN_VALUE 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.NEGATIVE_INFINITY 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.NaN 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.Number 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.POSITIVE_INFINITY 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.isFinite 📋Firefox10/9/2012 Chrome Android2/27/2013141
javascript.builtins.Number.isInteger 📋Firefox10/9/2012 Chrome Android4/2/2014540
javascript.builtins.Number.isNaN 📋Firefox8/28/2012 Chrome Android2/27/2013183
javascript.builtins.Number.isSafeInteger 📋Chrome Android4/2/2014 Firefox9/2/2014153
javascript.builtins.Number.parseFloat 📋Firefox10/29/2013 Chrome Android4/2/2014155
javascript.builtins.Number.parseInt 📋Firefox10/29/2013 Chrome Android4/2/2014155
javascript.builtins.Number.toExponential 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.toFixed 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.toLocaleString 📋Firefox11/9/2004 Chrome Android6/27/20122787
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 Android4/3/2013 Firefox4/29/2014391
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 Android4/3/2013 Firefox4/29/2014391
javascript.builtins.Number.toPrecision 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Number.valueOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.Object 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.assign 📋Firefox12/1/2014 Chrome Android9/1/2015274
javascript.builtins.Object.constructor 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.create 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.defineGetter 📋Firefox11/9/2004 Chrome Android6/27/20122787
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 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.defineProperty 📋Firefox3/22/2011 Chrome Android6/27/2012463
Internet Explorer: In Internet Explorer 8, this was only supported on DOM objects and with some non-standard behaviors. This was later fixed in Internet Explorer 9.Safari: Also supported in Safari 5, but not on DOM objects.Safari on iOS: Also supported in Safari for iOS 4.2, but not on DOM objects.WebView on iOS: Also supported in Safari for iOS 4.2, but not on DOM objects.
javascript.builtins.Object.defineSetter 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Starting with Firefox 48, this method can no longer be called at the global scope without any object. A TypeError will be thrown otherwise. Previously, the global object was used in these cases automatically, but this is no longer the case.
javascript.builtins.Object.entries 📋Firefox6/7/2016 Chrome Android10/19/2016134
javascript.builtins.Object.freeze 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.fromEntries 📋Firefox10/23/2018 Chrome Android3/12/2019140
javascript.builtins.Object.getOwnPropertyDescriptor 📋Firefox3/22/2011 Chrome Android6/27/2012463
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 📋Chrome Android10/19/2016 Firefox11/15/201627
javascript.builtins.Object.getOwnPropertyNames 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.getOwnPropertySymbols 📋Chrome Android10/8/2014 Firefox2/24/2015139
javascript.builtins.Object.getPrototypeOf 📋Firefox6/30/2009 Chrome Android6/27/20121093
javascript.builtins.Object.groupBy 📋Chrome Android9/12/2023 Firefox10/24/202342
javascript.builtins.Object.hasOwn 📋Chrome Android8/31/2021 Firefox9/7/20217
javascript.builtins.Object.hasOwnProperty 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.is 📋Chrome Android2/27/2013 Firefox6/25/2013118
javascript.builtins.Object.isExtensible 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.isFrozen 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.isPrototypeOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.isSealed 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.keys 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.lookupGetter 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.lookupSetter 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.preventExtensions 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.preventExtensions.ES2015_behavior Firefox1/13/2015 Chrome Android7/29/2015197
javascript.builtins.Object.propertyIsEnumerable 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.proto 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.seal 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Object.setPrototypeOf 📋Chrome Android4/2/2014 Firefox7/22/2014111
javascript.builtins.Object.toLocaleString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.valueOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.Object.values 📋Firefox6/7/2016 Chrome Android10/19/2016134
javascript.builtins.Promise 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.@@species 📋Chrome Android6/8/2016 Firefox8/2/201655
javascript.builtins.Promise.Promise 📋Chrome Android1/15/2014 Firefox4/29/2014104
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 Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.allSettled 📋Chrome Android7/30/2019 Firefox12/10/2019133
javascript.builtins.Promise.any 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.builtins.Promise.catch 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.finally 📋Chrome Android12/5/2017 Firefox1/23/201849
javascript.builtins.Promise.race 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.reject 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.resolve 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.then 📋Chrome Android1/15/2014 Firefox4/29/2014104
javascript.builtins.Promise.try 📋Chrome Android8/20/2024 Firefox1/7/2025140
javascript.builtins.Promise.withResolvers 📋Chrome Android10/31/2023 Firefox12/19/202349
javascript.builtins.Proxy 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.Proxy 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.apply 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.construct 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.defineProperty 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.deleteProperty 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.get 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.getOwnPropertyDescriptor 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.getPrototypeOf 📋Chrome Android3/9/2016 Firefox9/20/2016195
javascript.builtins.Proxy.handler.has 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.isExtensible 📋Firefox7/22/2014 Chrome Android3/9/2016596
javascript.builtins.Proxy.handler.ownKeys 📋Firefox1/8/2013 Chrome Android3/9/20161156
Firefox: In Firefox 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.Firefox for Android: In Firefox for Android 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.
javascript.builtins.Proxy.handler.preventExtensions 📋Firefox6/25/2013 Chrome Android3/9/2016988
javascript.builtins.Proxy.handler.set 📋Firefox1/8/2013 Chrome Android3/9/20161156
javascript.builtins.Proxy.handler.setPrototypeOf 📋Chrome Android3/9/2016 Firefox9/20/2016195
javascript.builtins.Proxy.revocable 📋Firefox12/1/2014 Chrome Android12/5/20171100
javascript.builtins.RangeError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RangeError.RangeError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RangeError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.ReferenceError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.ReferenceError.ReferenceError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.ReferenceError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Reflect 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.apply 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.construct 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.defineProperty 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.deleteProperty 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.get 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.getOwnPropertyDescriptor 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.getPrototypeOf 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.has 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.isExtensible 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.ownKeys 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.preventExtensions 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.set 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.Reflect.setPrototypeOf 📋Firefox11/3/2015 Chrome Android3/9/2016127
javascript.builtins.RegExp 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.@@match 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@matchAll 📋Chrome Android3/12/2019 Firefox5/21/201970
javascript.builtins.RegExp.@@replace 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@search 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.@@species 📋Chrome Android6/8/2016 Firefox9/20/2016104
javascript.builtins.RegExp.@@split 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.RegExp.RegExp 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.compile 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.dotAll 📋Chrome Android10/24/2017 Firefox6/30/2020980
javascript.builtins.RegExp.escape 📋Firefox1/7/2025 Chrome Android4/29/2025112
javascript.builtins.RegExp.exec 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.flags 📋Firefox3/31/2015 Chrome Android3/9/2016344
javascript.builtins.RegExp.global 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.global.prototype_accessor Firefox5/12/2015 Chrome Android1/26/2016259
javascript.builtins.RegExp.hasIndices 📋Chrome Android4/13/2021 Firefox4/19/20216
javascript.builtins.RegExp.ignoreCase 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.ignoreCase.prototype_accessor Firefox5/12/2015 Chrome Android1/26/2016259
javascript.builtins.RegExp.input 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.lastIndex 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.lastMatch 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.lastParen 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.leftContext 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.multiline 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.multiline.prototype_accessor Firefox5/12/2015 Chrome Android1/26/2016259
javascript.builtins.RegExp.n 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.rightContext 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.source 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.source.empty_regex_string Chrome Android6/27/2012 Firefox5/12/20151049
javascript.builtins.RegExp.source.escaping Firefox5/12/2015 Chrome Android3/12/20191400
javascript.builtins.RegExp.source.prototype_accessor Firefox9/22/2015 Chrome Android1/26/2016126
javascript.builtins.RegExp.sticky 📋Firefox6/17/2008 Chrome Android3/9/20162822
javascript.builtins.RegExp.sticky.anchored_sticky_flag Firefox1/26/2016 Chrome Android3/9/201643
javascript.builtins.RegExp.sticky.prototype_accessor Firefox5/12/2015 Chrome Android3/9/2016302
javascript.builtins.RegExp.test 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.RegExp.toString.escaping Firefox5/12/2015 Chrome Android3/12/20191400
javascript.builtins.RegExp.unicode 📋Chrome Android4/13/2016 Firefox4/26/201613
Edge: Case folding is implemented in version 13Node.js: Case folding is implemented in version 8.6.0
javascript.builtins.RegExp.unicodeSets 📋Chrome Android4/4/2023 Firefox8/1/2023119
javascript.builtins.Set 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Set.@@iterator 📋Firefox2/24/2015 Chrome Android5/27/201592
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Set.@@species 📋Firefox9/22/2015 Chrome Android6/8/2016260
javascript.builtins.Set.Set 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Set.Set.iterable_allowed Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Set.Set.null_allowed Chrome Android10/8/2014 Firefox3/31/2015174
javascript.builtins.Set.add 📋Firefox6/5/2012 Chrome Android10/8/2014855
Internet Explorer: Returns 'undefined' instead of the 'Set' object.
javascript.builtins.Set.clear 📋Firefox2/19/2013 Chrome Android10/8/2014596
javascript.builtins.Set.delete 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Set.difference 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.entries 📋Firefox9/17/2013 Chrome Android10/8/2014386
javascript.builtins.Set.forEach 📋Firefox10/29/2013 Chrome Android10/8/2014344
javascript.builtins.Set.has 📋Firefox6/5/2012 Chrome Android10/8/2014855
javascript.builtins.Set.intersection 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isDisjointFrom 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isSubsetOf 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.isSupersetOf 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.key_equality_for_zeros Firefox4/29/2014 Chrome Android10/8/2014162
javascript.builtins.Set.keys 📋Firefox9/17/2013 Chrome Android10/8/2014386
javascript.builtins.Set.size 📋Firefox2/19/2013 Chrome Android10/8/2014596
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 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.union 📋Chrome Android2/20/2024 Firefox6/11/2024112
javascript.builtins.Set.values 📋Firefox9/17/2013 Chrome Android10/8/2014386
javascript.builtins.SharedArrayBuffer 📋Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.SharedArrayBuffer.@@species 📋Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer 📋Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer.maxByteLength_option 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.byteLength 📋Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.SharedArrayBuffer.grow 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.growable 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.maxByteLength 📋Chrome Android3/7/2023 Firefox7/9/2024490
javascript.builtins.SharedArrayBuffer.slice 📋Firefox7/28/2020 Chrome Android3/2/2021217
javascript.builtins.String 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.@@iterator 📋Chrome Android10/8/2014 Firefox2/24/2015139
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.String.String 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.anchor 📋Firefox11/9/2004 Chrome Android6/27/20122787
Firefox: Starting with version 17, the quotation mark (") is replaced by its HTML reference character (") in strings supplied for the name parameter.
javascript.builtins.String.at 📋Firefox7/13/2021 Chrome Android7/20/20217
javascript.builtins.String.big 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.blink 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.bold 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.charAt 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.charCodeAt 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.codePointAt 📋Firefox4/29/2014 Chrome Android3/11/2015316
javascript.builtins.String.concat 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.endsWith 📋Firefox11/20/2012 Chrome Android7/16/2014603
javascript.builtins.String.fixed 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.fontcolor 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.fontsize 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.fromCharCode 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.fromCodePoint 📋Firefox4/29/2014 Chrome Android3/11/2015316
javascript.builtins.String.includes 📋Chrome Android3/11/2015 Firefox8/11/2015153
javascript.builtins.String.indexOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.isWellFormed 📋Chrome Android3/7/2023 Firefox10/24/2023231
javascript.builtins.String.italics 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.lastIndexOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.length 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.link 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.localeCompare 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.localeCompare.locales_parameter Chrome Android4/3/2013 Firefox4/29/2014391
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 Android4/3/2013 Firefox4/29/2014391
javascript.builtins.String.match 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.matchAll 📋Chrome Android3/12/2019 Firefox5/21/201970
javascript.builtins.String.normalize 📋Chrome Android4/2/2014 Firefox7/22/2014111
javascript.builtins.String.padEnd 📋Firefox8/2/2016 Chrome Android3/16/2017226
javascript.builtins.String.padStart 📋Firefox8/2/2016 Chrome Android3/16/2017226
javascript.builtins.String.raw 📋Firefox12/1/2014 Chrome Android3/11/2015100
javascript.builtins.String.repeat 📋Firefox9/17/2013 Chrome Android7/16/2014302
javascript.builtins.String.replace 📋Firefox11/9/2004 Chrome Android6/27/20122787
Internet Explorer: A replacement function as second argument is not supported.
javascript.builtins.String.replaceAll 📋Firefox6/2/2020 Chrome Android8/25/202084
javascript.builtins.String.search 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.slice 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.small 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.split 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.startsWith 📋Firefox11/20/2012 Chrome Android7/16/2014603
javascript.builtins.String.strike 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.sub 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.substr 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.substring 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.sup 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toLocaleLowerCase 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toLocaleLowerCase.locales_parameter Chrome Android4/25/2017 Firefox8/8/2017105
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.String.toLocaleUpperCase 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toLocaleUpperCase.locales_parameter Chrome Android4/25/2017 Firefox8/8/2017105
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.String.toLowerCase 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toString 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toUpperCase 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.String.toWellFormed 📋Chrome Android3/7/2023 Firefox10/24/2023231
javascript.builtins.String.trim 📋Firefox6/30/2009 Chrome Android6/27/20121093
javascript.builtins.String.trimEnd 📋Chrome Android4/17/2018 Firefox6/26/201870
javascript.builtins.String.trimStart 📋Chrome Android4/17/2018 Firefox6/26/201870
javascript.builtins.String.unicode_code_point_escapes Chrome Android6/27/2012 Firefox8/11/20151140
javascript.builtins.String.valueOf 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.SuppressedError 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.SuppressedError 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.error 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.SuppressedError.suppressed 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.builtins.Symbol 📋Chrome Android10/8/2014 Firefox2/24/2015139
Edge: Edge 12 included Symbol properties in JSON.stringify() output.
javascript.builtins.Symbol.@@toPrimitive 📋Chrome Android12/2/2015 Firefox1/26/201655
javascript.builtins.Symbol.Symbol 📋Chrome Android10/8/2014 Firefox2/24/2015139
javascript.builtins.Symbol.asyncDispose 📋Chrome Android7/23/2024 Firefox7/22/2025364
Node.js: Only available for fs and stream resources.Node.js: Only available for fs and stream resources.
javascript.builtins.Symbol.asyncIterator 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.builtins.Symbol.description 📋Chrome Android10/17/2018 Firefox10/23/20186
Safari: No support for an undefined description.Safari on iOS: No support for an undefined description.WebView on iOS: No support for an undefined description.
javascript.builtins.Symbol.dispose 📋Chrome Android5/14/2024 Firefox7/22/2025434
Node.js: Only available for fs and stream resources.Node.js: Only available for fs and stream resources.
javascript.builtins.Symbol.for 📋Chrome Android1/21/2015 Firefox2/24/201534
javascript.builtins.Symbol.hasInstance 📋Chrome Android4/13/2016 Firefox11/15/2016216
javascript.builtins.Symbol.isConcatSpreadable 📋Chrome Android1/26/2016 Firefox8/2/2016189
javascript.builtins.Symbol.iterator 📋Firefox2/24/2015 Chrome Android5/27/201592
javascript.builtins.Symbol.keyFor 📋Chrome Android1/21/2015 Firefox2/24/201534
javascript.builtins.Symbol.match 📋Firefox8/11/2015 Chrome Android4/13/2016246
javascript.builtins.Symbol.matchAll 📋Chrome Android3/12/2019 Firefox5/21/201970
javascript.builtins.Symbol.replace 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.search 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.species 📋Firefox9/22/2015 Chrome Android6/8/2016260
javascript.builtins.Symbol.split 📋Chrome Android4/13/2016 Firefox9/20/2016160
javascript.builtins.Symbol.toPrimitive 📋Chrome Android12/2/2015 Firefox1/26/201655
javascript.builtins.Symbol.toString 📋Chrome Android10/8/2014 Firefox2/24/2015139
javascript.builtins.Symbol.toStringTag 📋Chrome Android3/9/2016 Firefox1/24/2017321
javascript.builtins.Symbol.toStringTag.dom_objects Chrome Android4/13/2016 Firefox6/30/20201539
javascript.builtins.Symbol.unscopables 📋Chrome Android10/8/2014 Firefox8/2/2016664
javascript.builtins.Symbol.valueOf 📋Chrome Android10/8/2014 Firefox2/24/2015139
javascript.builtins.SyntaxError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.SyntaxError.SyntaxError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.SyntaxError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Temporal 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.Duration 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.abs 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.blank 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.days 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.hours 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.microseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.milliseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.minutes 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.months 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.nanoseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.negated 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.round 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.seconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.sign 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.total 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.weeks 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Duration.years 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.epochMilliseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.epochNanoseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.fromEpochMilliseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.fromEpochNanoseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.round 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.toZonedDateTimeISO 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Instant.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.instant 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.plainDateISO 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.plainDateTimeISO 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.plainTimeISO 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.timeZoneId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.Now.zonedDateTimeISO 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.calendarId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.day 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.dayOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.dayOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.daysInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.era 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.eraYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.inLeapYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.month 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.monthCode 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.monthsInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainMonthDay 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toPlainYearMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.toZonedDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.weekOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.withCalendar 📋Firefox5/27/2025 Chrome Android1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.PlainDate.year 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDate.yearOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.calendarId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.day 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.dayOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.dayOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.daysInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.era 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.eraYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.hour 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.inLeapYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.microsecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.millisecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.minute 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.month 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.monthCode 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.monthsInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.nanosecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.round 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.second 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toPlainDate 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toPlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.toZonedDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.weekOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.withCalendar 📋Firefox5/27/2025 Chrome Android1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.PlainDateTime.withPlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.year 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainDateTime.yearOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.calendarId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.day 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.monthCode 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toPlainDate 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainMonthDay.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.PlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.hour 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.microsecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.millisecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.minute 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.nanosecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.round 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.second 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainTime.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.calendarId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.daysInMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.daysInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.era 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.eraYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.inLeapYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.month 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.monthCode 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.monthsInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toPlainDate 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.PlainYearMonth.year 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.add 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.calendarId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.compare 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.day 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.dayOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.dayOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInMonth 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.daysInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.epochMilliseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.epochNanoseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.equals 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.era 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.eraYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.from 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.getTimeZoneTransition 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.hour 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.hoursInDay 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.inLeapYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.microsecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.millisecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.minute 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.month 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.monthCode 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.monthsInYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.nanosecond 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.offset 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.offsetNanoseconds 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.round 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.second 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.since 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.startOfDay 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.subtract 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.timeZoneId 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toInstant 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toJSON 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toLocaleString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainDate 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainDateTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toPlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.toString 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.until 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.valueOf 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.weekOfYear 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.with 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.withCalendar 📋Firefox5/27/2025 Chrome Android1/13/2026231
Firefox: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.Firefox for Android: Calendars islamic, islamic-rgsa and islamic-umalqura are not available. See bug 1950425 and bug 1954138.
javascript.builtins.Temporal.ZonedDateTime.withPlainTime 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.withTimeZone 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.year 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.Temporal.ZonedDateTime.yearOfWeek 📋Firefox5/27/2025 Chrome Android1/13/2026231
javascript.builtins.TypeError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.TypeError.TypeError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.TypeError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.TypedArray 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.@@iterator 📋Chrome Android10/8/2014 Firefox2/24/2015139
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 Android6/8/2016 Firefox8/2/201655
javascript.builtins.TypedArray.BYTES_PER_ELEMENT 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.at 📋Firefox7/13/2021 Chrome Android7/20/20217
javascript.builtins.TypedArray.buffer 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.byteLength 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.byteOffset 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.TypedArray.copyWithin 📋Firefox12/1/2014 Chrome Android9/1/2015274
javascript.builtins.TypedArray.entries 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.every 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.fill 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.filter 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.find 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.findIndex 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.findLast 📋Chrome Android1/4/2022 Firefox8/23/2022231
javascript.builtins.TypedArray.findLastIndex 📋Chrome Android1/4/2022 Firefox8/23/2022231
javascript.builtins.TypedArray.forEach 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.from 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.includes 📋Chrome Android12/2/2015 Firefox12/15/201513
javascript.builtins.TypedArray.indexOf 📋Firefox3/31/2015 Chrome Android9/1/2015154
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.index_properties_not_consulting_prototype Chrome Android6/27/2012 Firefox10/29/2013489
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 Android11/12/2014 Firefox3/7/2017846
javascript.builtins.TypedArray.join 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.keys 📋Chrome Android10/8/2014 Firefox3/31/2015174
javascript.builtins.TypedArray.lastIndexOf 📋Firefox3/31/2015 Chrome Android9/1/2015154
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.length 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.map 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.name 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.named_properties Chrome Android6/27/2012 Firefox6/10/2014713
javascript.builtins.TypedArray.of 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.reduce 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.reduceRight 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.reverse 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.set 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.slice 📋Firefox5/12/2015 Chrome Android9/1/2015112
javascript.builtins.TypedArray.some 📋Firefox3/31/2015 Chrome Android9/1/2015154
javascript.builtins.TypedArray.sort 📋Chrome Android9/1/2015 Firefox4/26/2016238
javascript.builtins.TypedArray.subarray 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.TypedArray.toLocaleString 📋Chrome Android6/27/2012 Firefox1/24/20171672
javascript.builtins.TypedArray.toReversed 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.TypedArray.toSorted 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.TypedArray.toString 📋Chrome Android6/27/2012 Firefox1/24/20171672
javascript.builtins.TypedArray.values 📋Chrome Android10/8/2014 Firefox3/31/2015174
javascript.builtins.TypedArray.with 📋Chrome Android2/7/2023 Firefox7/4/2023147
javascript.builtins.URIError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.URIError.URIError 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.URIError.serializable_object 📋Chrome Android9/10/2019 Firefox7/26/20221050
Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).
javascript.builtins.Uint16Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint16Array.Uint16Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint16Array.Uint16Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Uint16Array.Uint16Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Uint32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint32Array.Uint32Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint32Array.Uint32Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Uint32Array.Uint32Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Uint8Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint8Array.Uint8Array 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint8Array.Uint8Array.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Uint8Array.Uint8Array.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.Uint8Array.fromBase64 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8Array.fromHex 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8Array.setFromBase64 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8Array.setFromHex 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8Array.toBase64 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8Array.toHex 📋Firefox11/26/2024 Chrome Android9/2/2025280
javascript.builtins.Uint8ClampedArray 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray 📋Firefox3/22/2011 Chrome Android6/27/2012463
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.constructor_without_parameters Chrome Android6/27/2012 Firefox8/8/20171868
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.iterable_allowed Chrome Android11/12/2014 Firefox3/7/2017846
javascript.builtins.WeakMap 📋Firefox8/16/2011 Chrome Android7/16/20141065
javascript.builtins.WeakMap.WeakMap 📋Firefox8/16/2011 Chrome Android7/16/20141065
javascript.builtins.WeakMap.WeakMap.iterable_allowed Chrome Android10/8/2014 Firefox2/24/2015139
javascript.builtins.WeakMap.WeakMap.null_allowed Chrome Android7/16/2014 Firefox3/31/2015258
javascript.builtins.WeakMap.delete 📋Firefox8/16/2011 Chrome Android7/16/20141065
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.get 📋Firefox8/16/2011 Chrome Android7/16/20141065
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.
javascript.builtins.WeakMap.getOrInsert 📋Firefox10/14/2025 Chrome Android2/10/2026119
javascript.builtins.WeakMap.getOrInsertComputed 📋Firefox10/14/2025 Chrome Android2/10/2026119
javascript.builtins.WeakMap.has 📋Firefox8/16/2011 Chrome Android7/16/20141065
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.set 📋Firefox8/16/2011 Chrome Android7/16/20141065
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.WeakMap.symbol_as_keys Chrome Android1/10/2023 Firefox12/9/20251064
javascript.builtins.WeakRef 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.WeakRef.WeakRef 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.WeakRef.WeakRef.symbol_as_target Chrome Android1/10/2023 Firefox12/9/20251064
javascript.builtins.WeakRef.deref 📋Chrome Android7/27/2020 Firefox7/28/20201
javascript.builtins.WeakSet 📋Chrome Android7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.WeakSet 📋Chrome Android7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.WeakSet.iterable_allowed Chrome Android10/8/2014 Firefox12/1/201454
javascript.builtins.WeakSet.WeakSet.null_allowed Chrome Android7/16/2014 Firefox3/31/2015258
javascript.builtins.WeakSet.add 📋Chrome Android7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.delete 📋Chrome Android7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.has 📋Chrome Android7/16/2014 Firefox12/1/2014138
javascript.builtins.WeakSet.symbol_as_keys Chrome Android1/10/2023 Firefox12/9/20251064
javascript.builtins.decodeURI 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.decodeURIComponent 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.encodeURI 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.encodeURIComponent 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.escape 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.eval 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.globalThis 📋Chrome Android12/4/2018 Firefox1/29/201956
javascript.builtins.isFinite 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.isNaN 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.parseFloat 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.parseInt 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.parseInt.leading_zero_strings_as_decimal Chrome Android2/27/2013 Firefox5/14/201376
javascript.builtins.undefined 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.builtins.unescape 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.classes 📋Firefox3/8/2016 Chrome Android3/9/20161
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 📋Firefox3/8/2016 Chrome Android3/9/20161
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 📋Firefox3/8/2016 Chrome Android3/9/20161
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 Android4/24/2019 Firefox7/13/2021811
javascript.classes.private_class_fields_in 📋Chrome Android5/25/2021 Firefox7/13/202149
javascript.classes.private_class_methods 📋Chrome Android7/27/2020 Firefox7/13/2021351
javascript.classes.public_class_fields 📋Chrome Android1/29/2019 Firefox9/3/2019217
Safari: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari: Doesn't support public static fields. See bug 194095.Safari on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari on iOS: Doesn't support public static fields. See bug 194095.WebView on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.WebView on iOS: Doesn't support public static fields. See bug 194095.
javascript.classes.static 📋Firefox3/8/2016 Chrome Android3/9/20161
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 Android1/29/2019 Firefox4/7/2020434
javascript.classes.static.initialization_blocks 📋Chrome Android9/21/2021 Firefox10/5/202114
javascript.functions 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.functions.arguments 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.functions.arguments.@@iterator 📋Firefox4/26/2016 Chrome Android7/27/201692
javascript.functions.arguments.callee 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.functions.arguments.length 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.functions.arrow_functions 📋Firefox6/25/2013 Chrome Android9/1/2015798
Firefox: The initial implementation of arrow functions in Firefox made them automatically strict. This has been changed as of Firefox 24. The use of 'use strict'; is now required.Firefox: Before Firefox 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.Firefox for Android: The initial implementation of arrow functions in Firefox for Android made them automatically strict. This has been changed as of Firefox for Android 24. The use of 'use strict'; is now required.Firefox for Android: Before Firefox for Android 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.
javascript.functions.arrow_functions.trailing_comma Firefox3/7/2017 Chrome Android4/25/201749
javascript.functions.block_level_functions Chrome Android3/9/2016 Firefox4/26/201648
javascript.functions.default_parameters 📋Firefox8/28/2012 Chrome Android3/9/20161289
javascript.functions.default_parameters.destructured_parameter_with_default_value_assignment Firefox9/22/2015 Chrome Android3/9/2016169
javascript.functions.default_parameters.parameters_without_defaults_after_default_parameters Firefox12/10/2013 Chrome Android3/9/2016820
javascript.functions.get 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.functions.get.computed_property_names Firefox12/1/2014 Chrome Android10/14/2015317
javascript.functions.method_definitions 📋Chrome Android11/12/2014 Firefox12/1/201419
javascript.functions.method_definitions.async_generator_methods Firefox11/14/2017 Chrome Android12/5/201721
javascript.functions.method_definitions.async_methods Chrome Android12/6/2016 Firefox3/7/201791
javascript.functions.method_definitions.generator_methods_not_constructable Chrome Android4/15/2015 Firefox12/15/2015244
javascript.functions.rest_parameters 📋Firefox8/28/2012 Chrome Android12/2/20151191
javascript.functions.rest_parameters.destructuring Chrome Android3/9/2016 Firefox3/7/2017363
javascript.functions.set 📋Firefox11/29/2005 Chrome Android6/27/20122402
javascript.functions.set.computed_property_names Firefox12/1/2014 Chrome Android10/14/2015317
javascript.grammar.array_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.binary_numeric_literals 📋Firefox10/29/2013 Chrome Android3/11/2015498
javascript.grammar.boolean_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.decimal_numeric_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.hashbang_comments 📋Chrome Android4/24/2019 Firefox5/21/201927
javascript.grammar.hexadecimal_escape_sequences 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.hexadecimal_numeric_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.null_literal 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.numeric_separators 📋Chrome Android6/4/2019 Firefox10/22/2019140
javascript.grammar.octal_numeric_literals 📋Firefox10/29/2013 Chrome Android3/11/2015498
javascript.grammar.regular_expression_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.shorthand_object_literals Firefox10/14/2014 Chrome Android5/27/2015225
javascript.grammar.string_literals 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.template_literals 📋Firefox12/1/2014 Chrome Android3/11/2015100
javascript.grammar.template_literals.template_literal_revision Firefox4/19/2017 Chrome Android10/24/2017188
javascript.grammar.trailing_commas 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import 📋Chrome Android5/25/2021 Firefox4/29/20251435
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.grammar.trailing_commas.trailing_commas_in_functions Firefox3/7/2017 Chrome Android4/25/201749
javascript.grammar.trailing_commas.trailing_commas_in_object_literals Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.unicode_escape_sequences 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.grammar.unicode_point_escapes 📋Chrome Android7/29/2015 Firefox8/11/201513
javascript.operators.addition 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.addition_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.async_function 📋Chrome Android12/6/2016 Firefox3/7/201791
javascript.operators.async_generator_function 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.operators.await 📋Chrome Android12/6/2016 Firefox3/7/201791
javascript.operators.await.top_level 📋Chrome Android3/2/2021 Firefox6/1/202191
Node.js: Not supported in CommonJS modules.Safari: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).Safari on iOS: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).WebView on iOS: Doesn't support multiple modules simultaneously importing a module containing a top-level await (see bug 242740).
javascript.operators.bitwise_and 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_and_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_not 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_or 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_or_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_xor 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.bitwise_xor_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.class 📋Chrome Android4/15/2015 Firefox3/8/2016328
javascript.operators.comma 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.conditional 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.decrement 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.delete 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.destructuring 📋Firefox9/22/2015 Chrome Android3/9/2016169
Firefox: Firefox provided a non-standard destructuring implementation from Firefox 2 to 40.Firefox for Android: Firefox for Android provided a non-standard destructuring implementation from Firefox for Android 4 to 40.
javascript.operators.destructuring.computed_property_names Firefox9/22/2015 Chrome Android3/9/2016169
javascript.operators.destructuring.rest_in_arrays Firefox9/22/2015 Chrome Android3/9/2016169
javascript.operators.destructuring.rest_in_objects Chrome Android8/1/2017 Firefox8/8/20177
javascript.operators.division 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.division_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.equality 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.exponentiation 📋Chrome Android7/27/2016 Firefox3/7/2017223
javascript.operators.exponentiation_assignment 📋Chrome Android7/27/2016 Firefox3/7/2017223
javascript.operators.function 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.function.trailing_comma Firefox3/7/2017 Chrome Android4/25/201749
javascript.operators.generator_function 📋Firefox12/10/2013 Chrome Android3/9/2016820
javascript.operators.generator_function.trailing_comma Firefox3/7/2017 Chrome Android4/25/201749
javascript.operators.greater_than 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.greater_than_or_equal 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.grouping 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.import 📋Chrome Android12/5/2017 Firefox5/21/2019532
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 Android5/25/2021 Firefox4/29/20251435
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.operators.import.worker_support Chrome Android2/4/2020 Firefox6/6/20231218
javascript.operators.import_meta 📋Chrome Android1/23/2018 Firefox9/5/2018225
javascript.operators.import_meta.resolve 📋Chrome Android9/2/2022 Firefox10/18/202246
Node.js: Returns a URL object instead of a string.
javascript.operators.in 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.increment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.inequality 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.instanceof 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.left_shift 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.left_shift_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.less_than 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.less_than_or_equal 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.logical_and 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.logical_and_assignment 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.operators.logical_not 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.logical_or 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.logical_or_assignment 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.operators.multiplication 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.multiplication_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.new 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.new_target 📋Firefox9/22/2015 Chrome Android10/14/201522
javascript.operators.null 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.nullish_coalescing 📋Firefox1/7/2020 Chrome Android2/4/202028
javascript.operators.nullish_coalescing_assignment 📋Firefox7/28/2020 Chrome Android8/25/202028
javascript.operators.object_initializer 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.object_initializer.computed_property_names Firefox12/1/2014 Chrome Android12/2/2015366
javascript.operators.object_initializer.shorthand_method_names Firefox12/1/2014 Chrome Android12/2/2015366
javascript.operators.object_initializer.shorthand_property_names Firefox10/14/2014 Chrome Android12/2/2015414
javascript.operators.object_initializer.spread_properties Chrome Android8/1/2017 Firefox8/8/20177
javascript.operators.optional_chaining 📋Chrome Android2/4/2020 Firefox3/10/202035
javascript.operators.property_accessors 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.remainder 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.remainder_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.right_shift 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.right_shift_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.spread 📋Firefox10/9/2012 Chrome Android10/14/20151100
javascript.operators.spread.spread_in_arrays 📋Firefox10/9/2012 Chrome Android10/14/20151100
javascript.operators.spread.spread_in_function_calls 📋Firefox2/4/2014 Chrome Android10/14/2015617
javascript.operators.spread.spread_in_object_literals 📋Chrome Android8/1/2017 Firefox8/8/20177
javascript.operators.strict_equality 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.strict_inequality 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.subtraction 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.subtraction_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.super 📋Chrome Android4/15/2015 Firefox3/8/2016328
javascript.operators.this 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.typeof 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.unary_negation 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.unary_plus 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.unsigned_right_shift 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.unsigned_right_shift_assignment 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.void 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.operators.yield 📋Firefox12/10/2013 Chrome Android11/12/2014337
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox: Starting with Firefox 29, an IteratorResult object returned for completed generator function.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 29, an IteratorResult object returned for completed generator function.
javascript.operators.yield_star 📋Firefox2/4/2014 Chrome Android11/12/2014281
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.
javascript.regular_expressions.backreference 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.capturing_group 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.character_class 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.character_class_escape 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.character_escape 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.character_escape.unicode Chrome Android4/13/2016 Firefox4/26/201613
javascript.regular_expressions.disjunction 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.input_boundary_assertion 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.literal_character 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.lookahead_assertion 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.lookbehind_assertion 📋Chrome Android10/24/2017 Firefox6/30/2020980
javascript.regular_expressions.modifier 📋Chrome Android5/14/2024 Firefox10/29/2024168
javascript.regular_expressions.named_backreference 📋Chrome Android1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.named_capturing_group 📋Chrome Android1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups Chrome Android5/14/2024 Firefox8/6/202484
javascript.regular_expressions.non_capturing_group 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.quantifier 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.unicode_character_class_escape 📋Chrome Android1/23/2018 Firefox6/30/2020889
javascript.regular_expressions.wildcard 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.regular_expressions.word_boundary_assertion 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.async_function 📋Chrome Android12/6/2016 Firefox3/7/201791
javascript.statements.async_generator_function 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.statements.await_using 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.statements.block 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.break 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.class 📋Firefox3/8/2016 Chrome Android3/9/20161
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 📋Chrome Android2/27/2013 Firefox2/24/2015727
Firefox: Before Firefox 13, const is implemented, but re-assignment is not failing.Firefox: Before Firefox 46, a TypeError was thrown on redeclaration instead of a SyntaxError.Firefox for Android: Before Firefox for Android 14, const is implemented, but re-assignment is not failing.Firefox for Android: Before Firefox for Android 46, a TypeError was thrown on redeclaration instead of a SyntaxError.
javascript.statements.continue 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.debugger 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.do_while 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.empty 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.export 📋Chrome Android9/5/2017 Firefox5/9/2018246
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.export.arbitrary_module_namespace_identifier_names Chrome Android1/19/2021 Firefox3/23/202163
javascript.statements.export.default 📋Chrome Android9/5/2017 Firefox5/9/2018246
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.export.namespace 📋Chrome Android1/29/2019 Firefox8/25/2020574
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.for 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.for_await_of 📋Firefox11/14/2017 Chrome Android12/5/201721
javascript.statements.for_in 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.for_of 📋Firefox6/5/2012 Chrome Android10/8/2014855
Firefox: Before Firefox 51, using the for...of loop construct with the const keyword threw a SyntaxError ("missing = in const declaration").Firefox for Android: Before Firefox for Android 51, using the for...of loop construct with the const keyword threw a SyntaxError ("missing = in const declaration").
javascript.statements.for_of.async_iterators Firefox11/14/2017 Chrome Android12/5/201721
javascript.statements.for_of.closing_iterators Chrome Android6/8/2016 Firefox4/19/2017315
javascript.statements.function 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.function.trailing_comma_in_parameters Firefox3/7/2017 Chrome Android4/25/201749
javascript.statements.generator_function 📋Firefox12/10/2013 Chrome Android11/12/2014337
javascript.statements.generator_function.IteratorResult_object Firefox4/29/2014 Chrome Android3/9/2016680
javascript.statements.generator_function.not_constructable_with_new Firefox12/15/2015 Chrome Android4/13/2016120
javascript.statements.generator_function.trailing_comma_in_parameters Firefox3/7/2017 Chrome Android4/25/201749
javascript.statements.if_else 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.import 📋Chrome Android9/5/2017 Firefox5/9/2018246
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.import.arbitrary_module_namespace_identifier_names Chrome Android1/19/2021 Firefox3/23/202163
javascript.statements.import.import_attributes 📋Chrome Android3/19/2024 Firefox4/29/2025406
javascript.statements.import.import_attributes.type_css Chrome Android3/19/2024 Firefox1/13/2026665
javascript.statements.import.import_attributes.type_json Chrome Android3/19/2024 Firefox4/29/2025406
javascript.statements.import.service_worker_support Chrome Android5/25/2021 Firefox1/13/20261694
javascript.statements.import.worker_support Chrome Android2/4/2020 Firefox6/6/20231218
javascript.statements.label 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.let 📋Firefox1/26/2016 Chrome Android3/9/201643
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Edge: In Edge 12 and 13, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Firefox: Before Firefox 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox: Before Firefox 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox: Firefox 54 adds support of let in workers.Firefox for Android: Before Firefox for Android 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox for Android: Before Firefox for Android 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox for Android: Firefox for Android 54 adds support of let in workers.Internet Explorer: In Internet Explorer, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.statements.return 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.switch 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.throw 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.try_catch 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.try_catch.optional_catch_binding Firefox1/23/2018 Chrome Android4/17/201884
javascript.statements.using 📋Chrome Android3/4/2025 Firefox7/22/2025140
javascript.statements.var 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.while 📋Firefox11/9/2004 Chrome Android6/27/20122787
javascript.statements.with 📋Firefox11/9/2004 Chrome Android6/27/20122787