Now Stable

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

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

Example Comparisons
Browsers
Features

Stable APIs

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

2026/4

API First Browser Date Last Browser Date Days Notes
html.elements.link.rel.modulepreload.as-json 📋Safari on iOS12/12/2025 Chrome Android4/7/2026116

2026/2

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Map.getOrInsert 📋Safari on iOS12/12/2025 Chrome Android2/10/202660
javascript.builtins.Map.getOrInsertComputed 📋Safari on iOS12/12/2025 Chrome Android2/10/202660
javascript.builtins.WeakMap.getOrInsert 📋Safari on iOS12/12/2025 Chrome Android2/10/202660
javascript.builtins.WeakMap.getOrInsertComputed 📋Safari on iOS12/12/2025 Chrome Android2/10/202660

2025/12

API First Browser Date Last Browser Date Days Notes
html.elements.button.command 📋Chrome Android4/1/2025 Safari on iOS12/12/2025255
html.elements.button.command.request-close 📋Chrome Android8/5/2025 Safari on iOS12/12/2025129
html.elements.button.commandfor 📋Chrome Android4/1/2025 Safari on iOS12/12/2025255
html.elements.button.commandfor.implicit_anchor_reference 📋Chrome Android4/1/2025 Safari on iOS12/12/2025255
html.elements.details.search_match_opens Chrome Android1/4/2022 Safari on iOS12/12/20251438
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.script.type.speculationrules 📋Chrome Android1/10/2023 Safari on iOS12/12/20251067
Chrome: Initial support included same-origin prerendering only.Chrome Android: Initial support included same-origin prerendering only.Edge: Initial support included same-origin prerendering only.Quest Browser: Initial support included same-origin prerendering only.Opera: Initial support included same-origin prerendering only.Opera Android: Initial support included same-origin prerendering only.Samsung Internet: Initial support included same-origin prerendering only.WebView Android: Initial support included same-origin prerendering only.
html.elements.script.type.speculationrules.eagerness 📋Chrome Android1/23/2024 Safari on iOS12/12/2025689
Safari: Only conservative is supported for document rules (though moderate automatically falls back to conservative). Only eager and immediate is supported for list rules.Safari on iOS: Only conservative is supported for document rules (though moderate automatically falls back to conservative). Only eager and immediate is supported for list rules.
html.elements.script.type.speculationrules.prefetch 📋Chrome Android6/21/2022 Safari on iOS12/12/20251270
html.elements.script.type.speculationrules.referrer_policy 📋Chrome Android3/7/2023 Safari on iOS12/12/20251011
html.elements.script.type.speculationrules.relative_to 📋Chrome Android1/23/2024 Safari on iOS12/12/2025689
html.elements.script.type.speculationrules.source_optional 📋Chrome Android2/20/2024 Safari on iOS12/12/2025661
html.elements.script.type.speculationrules.tag 📋Chrome Android4/29/2025 Safari on iOS12/12/2025227
html.elements.script.type.speculationrules.urls 📋Chrome Android6/21/2022 Safari on iOS12/12/20251270
html.elements.script.type.speculationrules.where 📋Chrome Android1/23/2024 Safari on iOS12/12/2025689
html.global_attributes.hidden.until-found 📋Chrome Android5/24/2022 Safari on iOS12/12/20251298
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.

2025/9

API First Browser Date Last Browser Date Days Notes
html.elements.button.popovertarget.implicit_anchor_reference 📋Chrome Android2/4/2025 Safari on iOS9/15/2025223
html.elements.input.popovertarget.implicit_anchor_reference 📋Chrome Android2/4/2025 Safari on iOS9/15/2025223
html.elements.link.rel.dns-prefetch 📋Chrome Android10/14/2015 Safari on iOS9/15/20253624
Firefox: Only HTTP pages were supported.Firefox for Android: Only HTTP pages were supported.
html.elements.template.shadowrootreferencetarget Chrome Android2/4/2025 Safari on iOS9/15/2025223
javascript.regular_expressions.modifier 📋Chrome Android5/14/2024 Safari on iOS9/15/2025489
javascript.builtins.Uint8Array.fromBase64 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265
javascript.builtins.Uint8Array.fromHex 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265
javascript.builtins.Uint8Array.setFromBase64 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265
javascript.builtins.Uint8Array.setFromHex 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265
javascript.builtins.Uint8Array.toBase64 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265
javascript.builtins.Uint8Array.toHex 📋Safari on iOS12/11/2024 Chrome Android9/2/2025265

2025/4

API First Browser Date Last Browser Date Days Notes
javascript.builtins.RegExp.escape 📋Safari on iOS12/11/2024 Chrome Android4/29/2025139
html.elements.meta.name.viewport.viewport-fit 📋Safari on iOS9/19/2017 Chrome Android4/1/20252751
html.elements.meta.name.viewport.viewport-fit.auto 📋Safari on iOS9/19/2017 Chrome Android4/1/20252751
html.elements.meta.name.viewport.viewport-fit.cover 📋Safari on iOS9/19/2017 Chrome Android4/1/20252751
javascript.builtins.DataView.getFloat16 📋Safari on iOS12/11/2024 Chrome Android4/1/2025111
javascript.builtins.DataView.setFloat16 📋Safari on iOS12/11/2024 Chrome Android4/1/2025111
javascript.builtins.Float16Array 📋Safari on iOS12/11/2024 Chrome Android4/1/2025111
javascript.builtins.Float16Array.Float16Array 📋Safari on iOS12/11/2024 Chrome Android4/1/2025111
javascript.builtins.Math.f16round 📋Safari on iOS12/11/2024 Chrome Android4/1/2025111

2025/3

API First Browser Date Last Browser Date Days Notes
html.elements.input.webkitdirectory Chrome Android1/14/2025 Safari on iOS3/31/202576
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.script.type.importmap.multiple_import_maps 📋Chrome Android2/4/2025 Safari on iOS3/31/202555
javascript.builtins.Atomics.pause 📋Chrome Android2/4/2025 Safari on iOS3/31/202555
javascript.builtins.Error.isError 📋Chrome Android3/4/2025 Safari on iOS3/31/202527
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.Iterator.Iterator 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.drop 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.every 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.filter 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.find 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.flatMap 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.forEach 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.from 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.map 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.reduce 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.some 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.take 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.Iterator.toArray 📋Chrome Android2/20/2024 Safari on iOS3/31/2025405
javascript.builtins.JSON.parse.reviver_parameter_context_argument 📋Chrome Android5/30/2023 Safari on iOS3/31/2025671

2024/12

API First Browser Date Last Browser Date Days Notes
html.elements.input.type_week 📋Chrome Android2/27/2013 Safari on iOS12/11/20244305
html.elements.link.blocking 📋Chrome Android9/2/2022 Safari on iOS12/11/2024831
html.elements.script.blocking 📋Chrome Android9/2/2022 Safari on iOS12/11/2024831
html.elements.style.blocking 📋Chrome Android9/2/2022 Safari on iOS12/11/2024831
javascript.builtins.Promise.try 📋Chrome Android8/20/2024 Safari on iOS12/11/2024113

2024/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.Locale.getCalendars 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getCollations 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getHourCycles 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getNumberingSystems 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTextInfo 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getTimeZones 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.
javascript.builtins.Intl.Locale.getWeekInfo 📋Safari on iOS9/18/2023 Chrome Android10/15/2024393
Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property.

2024/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DurationFormat 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
javascript.builtins.Intl.DurationFormat.DurationFormat 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
javascript.builtins.Intl.DurationFormat.format 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
javascript.builtins.Intl.DurationFormat.formatToParts 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
javascript.builtins.Intl.DurationFormat.resolvedOptions 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋Safari on iOS3/27/2023 Chrome Android9/17/2024540
html.elements.script.type.importmap.integrity 📋Chrome Android7/23/2024 Safari on iOS9/16/202455
html.elements.template.shadowrootserializable 📋Chrome Android5/14/2024 Safari on iOS9/16/2024125
html.global_attributes.writingsuggestions 📋Chrome Android4/16/2024 Safari on iOS9/16/2024153

2024/5

API First Browser Date Last Browser Date Days Notes
javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups Safari on iOS9/18/2023 Chrome Android5/14/2024239
html.elements.template.shadowrootclonable 📋Chrome Android4/16/2024 Safari on iOS5/13/202427

2024/4

API First Browser Date Last Browser Date Days Notes
html.elements.input.type_range.vertical_orientation Safari on iOS5/18/2023 Chrome Android4/16/2024334
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.

2024/3

API First Browser Date Last Browser Date Days Notes
html.elements.template.shadowrootdelegatesfocus 📋Safari on iOS3/27/2023 Chrome Android3/19/2024358
javascript.statements.import.import_attributes 📋Safari on iOS12/11/2023 Chrome Android3/19/202499
javascript.statements.import.import_attributes.type_json Safari on iOS12/11/2023 Chrome Android3/19/202499
javascript.builtins.ArrayBuffer.detached 📋Chrome Android5/30/2023 Safari on iOS3/5/2024280
javascript.builtins.ArrayBuffer.transfer 📋Chrome Android5/30/2023 Safari on iOS3/5/2024280
javascript.builtins.ArrayBuffer.transferToFixedLength 📋Chrome Android5/30/2023 Safari on iOS3/5/2024280
javascript.builtins.Map.groupBy 📋Chrome Android9/12/2023 Safari on iOS3/5/2024175
javascript.builtins.Object.groupBy 📋Chrome Android9/12/2023 Safari on iOS3/5/2024175
javascript.builtins.Promise.withResolvers 📋Chrome Android10/31/2023 Safari on iOS3/5/2024126

2024/2

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Set.difference 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.intersection 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.isDisjointFrom 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.isSubsetOf 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.isSupersetOf 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.symmetricDifference 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155
javascript.builtins.Set.union 📋Safari on iOS9/18/2023 Chrome Android2/20/2024155

2024/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.fromAsync 📋Safari on iOS3/27/2023 Chrome Android1/23/2024302

2023/12

API First Browser Date Last Browser Date Days Notes
html.elements.details.name Chrome Android12/5/2023 Safari on iOS12/11/20236
html.elements.img.fetchpriority 📋Chrome Android4/26/2022 Safari on iOS12/11/2023594
html.elements.link.fetchpriority 📋Chrome Android4/26/2022 Safari on iOS12/11/2023594
html.elements.link.imagesizes 📋Chrome Android3/12/2019 Safari on iOS12/11/20231735
html.elements.link.imagesrcset 📋Chrome Android3/12/2019 Safari on iOS12/11/20231735
html.elements.script.fetchpriority 📋Chrome Android4/26/2022 Safari on iOS12/11/2023594
javascript.builtins.Error.captureStackTrace 📋Chrome Android6/27/2012 Safari on iOS12/11/20234184
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingMode_parameter Chrome Android9/12/2023 Safari on iOS12/11/202390

2023/10

API First Browser Date Last Browser Date Days Notes
html.elements.search 📋Safari on iOS9/18/2023 Chrome Android10/10/202322

2023/9

API First Browser Date Last Browser Date Days Notes
html.elements.button.popovertarget 📋Chrome Android5/30/2023 Safari on iOS9/18/2023111
html.elements.button.popovertargetaction 📋Chrome Android5/30/2023 Safari on iOS9/18/2023111
html.elements.iframe.sandbox.allow-downloads 📋Chrome Android5/19/2020 Safari on iOS9/18/20231217
html.elements.input.popovertarget 📋Chrome Android5/30/2023 Safari on iOS9/18/2023111
html.elements.input.popovertargetaction 📋Chrome Android5/30/2023 Safari on iOS9/18/2023111
html.elements.link.rel.modulepreload 📋Chrome Android4/17/2018 Safari on iOS9/18/20231980
html.elements.link.rel.modulepreload.as-script 📋Chrome Android4/17/2018 Safari on iOS9/18/20231980
html.global_attributes.popover 📋Chrome Android5/30/2023 Safari on iOS9/18/2023111
javascript.builtins.AggregateError.serializable_object Chrome Android2/1/2022 Safari on iOS9/18/2023594
Chrome: AggregateError serializes to the Error type, without additional properties.Chrome Android: AggregateError serializes to the Error type, without additional properties.Edge: AggregateError serializes to the Error type, without additional properties.Firefox: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Firefox for Android: AggregateError serializes to the AggregateError type, with properties name, message, cause, and errors.Quest Browser: AggregateError serializes to the Error type, without additional properties.Opera: AggregateError serializes to the Error type, without additional properties.Opera Android: AggregateError serializes to the Error type, without additional properties.Samsung Internet: AggregateError serializes to the Error type, without additional properties.WebView Android: AggregateError serializes to the Error type, without additional properties.
javascript.builtins.Function.toString.toString_revision Chrome Android4/17/2018 Safari on iOS9/18/20231980
javascript.builtins.RegExp.unicodeSets 📋Chrome Android4/4/2023 Safari on iOS9/18/2023167

2023/5

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.sandbox.allow-storage-access-by-user-activation Safari on iOS3/29/2018 Chrome Android5/2/20231860

2023/3

API First Browser Date Last Browser Date Days Notes
html.elements.form.autocomplete.webauthn 📋Chrome Android11/29/2022 Safari on iOS3/27/2023118
html.elements.iframe.allow.screen-wake-lock 📋Chrome Android7/27/2020 Safari on iOS3/27/2023973
html.elements.iframe.loading 📋Chrome Android9/10/2019 Safari on iOS3/27/20231294
html.elements.script.type.importmap 📋Chrome Android3/2/2021 Safari on iOS3/27/2023755
html.elements.template.shadowrootmode 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
html.global_attributes.autofocus 📋Chrome Android12/17/2019 Safari on iOS3/27/20231196
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).
javascript.builtins.ArrayBuffer.ArrayBuffer.maxByteLength_option 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.ArrayBuffer.maxByteLength 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.ArrayBuffer.resizable 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.ArrayBuffer.resize 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.Atomics.waitAsync 📋Chrome Android4/13/2021 Safari on iOS3/27/2023713
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.FinalizationRegistry.register.symbol_as_target Chrome Android1/10/2023 Safari on iOS3/27/202376
javascript.builtins.FinalizationRegistry.unregister.symbol_as_target Chrome Android1/10/2023 Safari on iOS3/27/202376
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter.string_values Chrome Android9/27/2022 Safari on iOS3/27/2023181
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer.maxByteLength_option 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.SharedArrayBuffer.grow 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.SharedArrayBuffer.growable 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.SharedArrayBuffer.maxByteLength 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.String.isWellFormed 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.String.toWellFormed 📋Chrome Android3/7/2023 Safari on iOS3/27/202320
javascript.builtins.WeakMap.symbol_as_keys Chrome Android1/10/2023 Safari on iOS3/27/202376
javascript.builtins.WeakRef.WeakRef.symbol_as_target Chrome Android1/10/2023 Safari on iOS3/27/202376
javascript.builtins.WeakSet.symbol_as_keys Chrome Android1/10/2023 Safari on iOS3/27/202376
javascript.classes.static.initialization_blocks 📋Chrome Android9/21/2021 Safari on iOS3/27/2023552
javascript.operators.import_meta.resolve 📋Chrome Android9/2/2022 Safari on iOS3/27/2023206
Node.js: Returns a URL object instead of a string.
javascript.regular_expressions.lookbehind_assertion 📋Chrome Android10/24/2017 Safari on iOS3/27/20231980

2023/2

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.toReversed 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.Array.toSorted 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.Array.toSpliced 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.Array.with 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.TypedArray.toReversed 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.TypedArray.toSorted 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148
javascript.builtins.TypedArray.with 📋Safari on iOS9/12/2022 Chrome Android2/7/2023148

2022/11

API First Browser Date Last Browser Date Days Notes
html.elements.form.rel 📋Safari on iOS3/14/2022 Chrome Android11/29/2022260

2022/10

API First Browser Date Last Browser Date Days Notes
html.elements.a.text_fragments Chrome Android2/4/2020 Safari on iOS10/24/2022993

2022/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.format.number_parameter-string_decimal Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.formatRange 📋Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.NumberFormat.formatRangeToParts 📋Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingPriority_parameter Safari on iOS3/14/2022 Chrome Android9/27/2022197
javascript.builtins.Intl.PluralRules.selectRange 📋Safari on iOS3/14/2022 Chrome Android9/27/2022197
html.elements.textarea.placeholder.line_breaks Chrome Android7/16/2014 Safari on iOS9/12/20222980
javascript.classes.public_class_fields 📋Chrome Android1/29/2019 Safari on iOS9/12/20221322
Safari: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari: Doesn't support public static fields. See bug 194095.Safari on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.Safari on iOS: Doesn't support public static fields. See bug 194095.WebView on iOS: Parentheses in field initializers can lead to ReferenceErrors. See bug 236843.WebView on iOS: Doesn't support public static fields. See bug 194095.
html.elements.video.disablepictureinpicture 📋Safari on iOS3/24/2020 Chrome Android9/2/2022892
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.

2022/5

API First Browser Date Last Browser Date Days Notes
html.global_attributes.inert 📋Safari on iOS5/16/2022 Chrome Android5/24/20228
html.global_attributes.nonce 📋Chrome Android9/5/2017 Safari on iOS5/16/20221714
Firefox: Firefox does not prevent nonce exfiltration through content attributes.Firefox for Android: Firefox for Android does not prevent nonce exfiltration through content attributes.Safari: Safari does not prevent nonce exfiltration through content attributes.Safari on iOS: Safari on iOS does not prevent nonce exfiltration through content attributes.WebView on iOS: WebView on iOS does not prevent nonce exfiltration through content attributes.

2022/3

API First Browser Date Last Browser Date Days Notes
html.elements.dialog 📋Chrome Android9/3/2014 Safari on iOS3/14/20222749
html.elements.dialog.open Chrome Android9/3/2014 Safari on iOS3/14/20222749
html.elements.img.loading 📋Chrome Android9/10/2019 Safari on iOS3/14/2022916
javascript.builtins.Array.at 📋Chrome Android7/20/2021 Safari on iOS3/14/2022237
javascript.builtins.Array.findLast 📋Chrome Android1/4/2022 Safari on iOS3/14/202269
javascript.builtins.Array.findLastIndex 📋Chrome Android1/4/2022 Safari on iOS3/14/202269
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values Chrome Android10/19/2021 Safari on iOS3/14/2022146
javascript.builtins.Intl.supportedValuesOf 📋Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_calendar Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_collation Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_currency Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_numberingSystem Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_timeZone Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Intl.supportedValuesOf.key_parameter_unit Chrome Android3/1/2022 Safari on iOS3/14/202213
javascript.builtins.Object.hasOwn 📋Chrome Android8/31/2021 Safari on iOS3/14/2022195
javascript.builtins.String.at 📋Chrome Android7/20/2021 Safari on iOS3/14/2022237
javascript.builtins.TypedArray.at 📋Chrome Android7/20/2021 Safari on iOS3/14/2022237
javascript.builtins.TypedArray.findLast 📋Chrome Android1/4/2022 Safari on iOS3/14/202269
javascript.builtins.TypedArray.findLastIndex 📋Chrome Android1/4/2022 Safari on iOS3/14/202269

2021/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Atomics 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
Safari: Before Safari 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.Safari on iOS: Before Safari on iOS 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.WebView on iOS: Before WebView on iOS 16.4, Atomics is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.
javascript.builtins.Atomics.add 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.and 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.compareExchange 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.exchange 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.isLockFree 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.load 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.notify 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.or 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.store 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.sub 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.wait 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.Atomics.xor 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.DataView.DataView.sharedarraybuffer_support Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.SharedArrayBuffer 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.SharedArrayBuffer.@@species 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.SharedArrayBuffer.SharedArrayBuffer 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.SharedArrayBuffer.byteLength 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286
javascript.builtins.SharedArrayBuffer.slice 📋Chrome Android3/2/2021 Safari on iOS12/13/2021286

2021/9

API First Browser Date Last Browser Date Days Notes
html.elements.img.aspect_ratio_computed_from_attributes Chrome Android12/17/2019 Safari on iOS9/20/2021643
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.meta.name.theme-color 📋Chrome Android7/20/2021 Safari on iOS9/20/202162
Chrome: Chrome uses the color only on installed progressive web apps.Chrome: Chrome reports support, but does not actually use the color anywhere.Chrome Android: Chrome for Android does not use the color on devices with native dark mode enabled unless it's an installed progressive web app or a trusted web activity.Edge: Edge uses the color only on installed progressive web apps.Quest Browser: Chrome for Android does not use the color on devices with native dark mode enabled unless it's an installed progressive web app or a trusted web activity.
html.elements.source.height 📋Chrome Android4/13/2021 Safari on iOS9/20/2021160
html.elements.source.width 📋Chrome Android4/13/2021 Safari on iOS9/20/2021160
javascript.builtins.BigInt64Array 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.BigInt64Array.BigInt64Array 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.BigUint64Array 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.BigUint64Array.BigUint64Array 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.DataView.getBigInt64 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.DataView.getBigUint64 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.DataView.setBigInt64 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.DataView.setBigUint64 📋Chrome Android5/31/2018 Safari on iOS9/20/20211208
javascript.builtins.Error.Error.options_cause_parameter 📋Chrome Android8/31/2021 Safari on iOS9/20/202120
javascript.builtins.Error.cause 📋Chrome Android8/31/2021 Safari on iOS9/20/202120
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.RegExp.hasIndices 📋Chrome Android4/13/2021 Safari on iOS9/20/2021160
javascript.classes.private_class_fields_in 📋Chrome Android5/25/2021 Safari on iOS9/20/2021118
javascript.classes.private_class_methods 📋Chrome Android7/27/2020 Safari on iOS9/20/2021420
javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import 📋Chrome Android5/25/2021 Safari on iOS9/20/2021118
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.operators.await.top_level 📋Chrome Android3/2/2021 Safari on iOS9/20/2021202
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.import.options_parameter 📋Chrome Android5/25/2021 Safari on iOS9/20/2021118
Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules.
javascript.operators.import.worker_support Chrome Android2/4/2020 Safari on iOS9/20/2021594
javascript.statements.import.service_worker_support Chrome Android5/25/2021 Safari on iOS9/20/2021118
javascript.statements.import.worker_support Chrome Android2/4/2020 Safari on iOS9/20/2021594

2021/7

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter Safari on iOS4/26/2021 Chrome Android7/20/202185

2021/5

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.IntlLegacyConstructedSymbol 📋Safari on iOS4/26/2021 Chrome Android5/25/202129
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.
javascript.builtins.Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol 📋Safari on iOS4/26/2021 Chrome Android5/25/202129
Chrome: The fallback symbol property has description IntlFallback.Chrome Android: The fallback symbol property has description IntlFallback.Edge: The fallback symbol property has description IntlFallback.Node.js: The fallback symbol property has description IntlFallback.Quest Browser: The fallback symbol property has description IntlFallback.Opera: The fallback symbol property has description IntlFallback.Opera Android: The fallback symbol property has description IntlFallback.Samsung Internet: The fallback symbol property has description IntlFallback.WebView Android: The fallback symbol property has description IntlFallback.

2021/4

API First Browser Date Last Browser Date Days Notes
html.elements.datalist.input_type_date 📋Chrome Android2/26/2014 Safari on iOS4/26/20212616
html.elements.input.type_date.list 📋Chrome Android2/26/2014 Safari on iOS4/26/20212616
javascript.builtins.FinalizationRegistry 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.FinalizationRegistry.FinalizationRegistry 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.FinalizationRegistry.register 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.FinalizationRegistry.unregister 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.Intl.Collator.Collator.options_collation_parameter Chrome Android10/20/2020 Safari on iOS4/26/2021188
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter Chrome Android2/4/2020 Safari on iOS4/26/2021447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter Chrome Android7/30/2019 Safari on iOS4/26/2021636
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter Chrome Android2/4/2020 Safari on iOS4/26/2021447
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter Chrome Android7/30/2019 Safari on iOS4/26/2021636
javascript.builtins.Intl.DateTimeFormat.formatRange 📋Chrome Android7/30/2019 Safari on iOS4/26/2021636
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DateTimeFormat.formatRangeToParts 📋Chrome Android7/30/2019 Safari on iOS4/26/2021636
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the DateTimeFormat() constructor for more details.
javascript.builtins.Intl.DisplayNames 📋Chrome Android4/7/2020 Safari on iOS4/26/2021384
javascript.builtins.Intl.DisplayNames.DisplayNames 📋Chrome Android4/7/2020 Safari on iOS4/26/2021384
javascript.builtins.Intl.DisplayNames.of 📋Chrome Android4/7/2020 Safari on iOS4/26/2021384
javascript.builtins.Intl.DisplayNames.resolvedOptions 📋Chrome Android4/7/2020 Safari on iOS4/26/2021384
javascript.builtins.Intl.DisplayNames.supportedLocalesOf 📋Chrome Android4/7/2020 Safari on iOS4/26/2021384
javascript.builtins.Intl.ListFormat 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.ListFormat 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the ListFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.format 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.formatToParts 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.resolvedOptions 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the ListFormat() constructor for more details.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.ListFormat.supportedLocalesOf 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.Safari: Only available on macOS Big Sur (11) and above.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
Safari: Doesn't support currencyDisplay: 'narrowSymbol'.Safari on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.WebView on iOS: Doesn't support currencyDisplay: 'narrowSymbol'.
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currencySign_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter Chrome Android2/27/2013 Safari on iOS4/26/20212980
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter Chrome Android9/10/2019 Safari on iOS4/26/2021594
javascript.builtins.Intl.Segmenter 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segmenter.Segmenter 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segmenter.resolvedOptions 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segmenter.segment 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segmenter.supportedLocalesOf 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segments 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segments.@@iterator 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.Intl.Segments.containing 📋Chrome Android11/17/2020 Safari on iOS4/26/2021160
javascript.builtins.WeakRef 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.WeakRef.WeakRef 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.builtins.WeakRef.deref 📋Chrome Android7/27/2020 Safari on iOS4/26/2021273
javascript.classes.private_class_fields 📋Chrome Android4/24/2019 Safari on iOS4/26/2021733
javascript.classes.static.class_fields 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
javascript.statements.export.arbitrary_module_namespace_identifier_names Chrome Android1/19/2021 Safari on iOS4/26/202197
javascript.statements.export.namespace 📋Chrome Android1/29/2019 Safari on iOS4/26/2021818
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.import.arbitrary_module_namespace_identifier_names Chrome Android1/19/2021 Safari on iOS4/26/202197

2021/1

API First Browser Date Last Browser Date Days Notes
html.elements.a.implicit_noopener Safari on iOS3/25/2019 Chrome Android1/19/2021666
html.elements.area.implicit_noopener Safari on iOS3/25/2019 Chrome Android1/19/2021666

2020/9

API First Browser Date Last Browser Date Days Notes
html.elements.a.referrerpolicy 📋Chrome Android6/8/2016 Safari on iOS9/16/20201561
html.elements.area.referrerpolicy 📋Chrome Android6/8/2016 Safari on iOS9/16/20201561
html.elements.iframe.referrerpolicy 📋Chrome Android6/8/2016 Safari on iOS9/16/20201561
html.elements.img.referrerpolicy 📋Chrome Android6/8/2016 Safari on iOS9/16/20201561
html.elements.link.referrerpolicy 📋Chrome Android6/8/2016 Safari on iOS9/16/20201561
html.elements.script.referrerpolicy 📋Chrome Android10/17/2018 Safari on iOS9/16/2020700
html.elements.video.aspect_ratio_computed_from_attributes Chrome Android12/17/2019 Safari on iOS9/16/2020274
javascript.builtins.AggregateError 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.builtins.AggregateError.AggregateError 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.builtins.AggregateError.errors 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.builtins.BigInt 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.BigInt 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.asIntN 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.asUintN 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.toLocaleString 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.toLocaleString.locales_parameter Chrome Android7/30/2019 Safari on iOS9/16/2020414
Deno: Only the locale data for en-US is available.
javascript.builtins.BigInt.toLocaleString.options_parameter Chrome Android7/30/2019 Safari on iOS9/16/2020414
javascript.builtins.BigInt.toString 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.BigInt.valueOf 📋Chrome Android5/31/2018 Safari on iOS9/16/2020839
javascript.builtins.Intl.Locale 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.Locale 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.baseName 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.calendar 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.caseFirst 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.collation 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.hourCycle 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.language 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.maximize 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.minimize 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.numberingSystem 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.numeric 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.region 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.script 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.Locale.toString 📋Chrome Android4/24/2019 Safari on iOS9/16/2020511
javascript.builtins.Intl.RelativeTimeFormat 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.locales_parameter Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the RelativeTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_localeMatcher_parameter Chrome Android12/4/2018 Safari on iOS9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numberingSystem_parameter Chrome Android12/4/2018 Safari on iOS9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.RelativeTimeFormat.options_parameter.options_numeric_parameter Chrome Android12/4/2018 Safari on iOS9/16/2020652
javascript.builtins.Intl.RelativeTimeFormat.format 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.formatToParts 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.resolvedOptions 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the RelativeTimeFormat() constructor for more details.
javascript.builtins.Intl.RelativeTimeFormat.supportedLocalesOf 📋Chrome Android12/4/2018 Safari on iOS9/16/2020652
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Promise.any 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.builtins.Symbol.toStringTag.dom_objects Chrome Android4/13/2016 Safari on iOS9/16/20201617
javascript.operators.logical_and_assignment 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.operators.logical_or_assignment 📋Chrome Android8/25/2020 Safari on iOS9/16/202022
javascript.operators.nullish_coalescing_assignment 📋Chrome Android8/25/2020 Safari on iOS9/16/202022

2020/8

API First Browser Date Last Browser Date Days Notes
javascript.builtins.String.replaceAll 📋Safari on iOS3/24/2020 Chrome Android8/25/2020154

2020/7

API First Browser Date Last Browser Date Days Notes
html.elements.form.autocomplete.one-time-code Safari on iOS9/17/2018 Chrome Android7/27/2020679
html.elements.textarea.autocomplete.one-time-code Safari on iOS9/17/2018 Chrome Android7/27/2020679

2020/4

API First Browser Date Last Browser Date Days Notes
html.elements.meta.name.color-scheme 📋Safari on iOS3/25/2019 Chrome Android4/7/2020379

2020/3

API First Browser Date Last Browser Date Days Notes
html.elements.base.href.forbid_data_javascript_urls Chrome Android4/25/2017 Safari on iOS3/24/20201064
html.elements.link.rel.prefetch 📋Chrome Android6/27/2012 Safari on iOS3/24/20202827
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.global_attributes.enterkeyhint 📋Chrome Android9/10/2019 Safari on iOS3/24/2020196
html.global_attributes.exportparts 📋Chrome Android3/12/2019 Safari on iOS3/24/2020378
html.global_attributes.part 📋Chrome Android3/12/2019 Safari on iOS3/24/2020378
javascript.grammar.hashbang_comments 📋Chrome Android4/24/2019 Safari on iOS3/24/2020335
javascript.operators.nullish_coalescing 📋Chrome Android2/4/2020 Safari on iOS3/24/202049
javascript.operators.optional_chaining 📋Chrome Android2/4/2020 Safari on iOS3/24/202049

2019/9

API First Browser Date Last Browser Date Days Notes
html.elements.a.download 📋Chrome Android6/27/2012 Safari on iOS9/19/20192640
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.audio.disableremoteplayback 📋Chrome Android2/1/2017 Safari on iOS9/19/2019960
html.elements.iframe.cross-origin-top-navigation-by-user-activation Chrome Android7/24/2018 Safari on iOS9/19/2019422
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.video.disableremoteplayback 📋Chrome Android2/1/2017 Safari on iOS9/19/2019960
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter Chrome Android3/12/2019 Safari on iOS9/19/2019191
javascript.builtins.Intl.NumberFormat.formatToParts 📋Chrome Android1/23/2018 Safari on iOS9/19/2019604
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.PluralRules 📋Chrome Android12/5/2017 Safari on iOS9/19/2019653
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 Safari on iOS9/19/2019653
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the PluralRules instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.PluralRules.resolvedOptions 📋Chrome Android12/5/2017 Safari on iOS9/19/2019653
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 Safari on iOS9/19/2019653
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the PluralRules() constructor for more details.
javascript.builtins.Intl.PluralRules.supportedLocalesOf 📋Chrome Android12/5/2017 Safari on iOS9/19/2019653
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.Promise.allSettled 📋Chrome Android7/30/2019 Safari on iOS9/19/201951
javascript.builtins.RegExp.@@matchAll 📋Chrome Android3/12/2019 Safari on iOS9/19/2019191
javascript.builtins.String.matchAll 📋Chrome Android3/12/2019 Safari on iOS9/19/2019191
javascript.builtins.Symbol.matchAll 📋Chrome Android3/12/2019 Safari on iOS9/19/2019191
javascript.grammar.numeric_separators 📋Chrome Android6/4/2019 Safari on iOS9/19/2019107

2019/6

API First Browser Date Last Browser Date Days Notes
html.elements.video.playsinline 📋Safari on iOS9/13/2016 Chrome Android6/4/2019994

2019/3

API First Browser Date Last Browser Date Days Notes
html.elements.datalist 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
Firefox for Android: The dropdown menu containing available options does not appear. See bug 1535985.
html.elements.datalist.input_type_color 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_email 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_number 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_range 📋Chrome Android3/16/2017 Safari on iOS3/25/2019739
html.elements.datalist.input_type_search 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_tel 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_text 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_time 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.datalist.input_type_url 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_color 📋Chrome Android2/27/2013 Safari on iOS3/25/20192217
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_color.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_email.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_number.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_range.list 📋Chrome Android3/16/2017 Safari on iOS3/25/2019739
html.elements.input.type_range.tick_marks Chrome Android5/31/2018 Safari on iOS3/25/2019298
html.elements.input.type_search.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_tel.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_text.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_time.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.elements.input.type_url.list 📋Chrome Android2/26/2014 Safari on iOS3/25/20191853
html.global_attributes.inputmode 📋Chrome Android4/17/2018 Safari on iOS3/25/2019342
Safari on iOS: Before iOS 13, inputmode="none" had no effect.WebView on iOS: Before iOS 13, inputmode="none" had no effect.
javascript.builtins.JSON.stringify.well_formed_stringify Chrome Android1/29/2019 Safari on iOS3/25/201955
javascript.builtins.Object.fromEntries 📋Chrome Android3/12/2019 Safari on iOS3/25/201913
javascript.builtins.Symbol.description 📋Chrome Android10/17/2018 Safari on iOS3/25/2019159
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.globalThis 📋Chrome Android12/4/2018 Safari on iOS3/25/2019111
javascript.builtins.RegExp.source.escaping Safari on iOS9/10/2012 Chrome Android3/12/20192374
javascript.builtins.RegExp.toString.escaping Safari on iOS9/10/2012 Chrome Android3/12/20192374

2018/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.sort.stable_sorting Safari on iOS3/27/2017 Chrome Android10/17/2018569

2018/9

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.allowfullscreen 📋Chrome Android10/8/2014 Safari on iOS9/17/20181440
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.meta.name.referrer 📋Chrome Android6/27/2012 Safari on iOS9/17/20182273
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.
javascript.builtins.Array.flat 📋Chrome Android9/4/2018 Safari on iOS9/17/201813
javascript.builtins.Array.flatMap 📋Chrome Android9/4/2018 Safari on iOS9/17/201813
javascript.builtins.AsyncGenerator 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.AsyncGenerator.next 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.AsyncGenerator.return 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.AsyncGenerator.throw 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.AsyncGeneratorFunction 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.AsyncGeneratorFunction.AsyncGeneratorFunction 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.builtins.JSON.json_superset Chrome Android4/17/2018 Safari on iOS9/17/2018153
javascript.builtins.String.trimEnd 📋Chrome Android4/17/2018 Safari on iOS9/17/2018153
javascript.builtins.String.trimStart 📋Chrome Android4/17/2018 Safari on iOS9/17/2018153
javascript.functions.method_definitions.async_generator_methods Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.operators.async_generator_function 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.operators.import_meta 📋Chrome Android1/23/2018 Safari on iOS9/17/2018237
javascript.statements.async_generator_function 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286
javascript.statements.for_await_of 📋Chrome Android12/5/2017 Safari on iOS9/17/2018286

2018/5

API First Browser Date Last Browser Date Days Notes
html.elements.video.autoplay.requires_muted_audio Safari on iOS9/13/2016 Chrome Android5/31/2018625
Firefox for Android: Between versions 79 and 91, the default behavior was to block videos from autoplaying, regardless of whether audio was muted.

2018/4

API First Browser Date Last Browser Date Days Notes
html.elements.select.autocomplete 📋Safari on iOS3/21/2016 Chrome Android4/17/2018757
html.elements.textarea.autocomplete 📋Safari on iOS3/21/2016 Chrome Android4/17/2018757
javascript.builtins.Array.values 📋Safari on iOS9/16/2015 Chrome Android4/17/2018944
javascript.statements.try_catch.optional_catch_binding Safari on iOS3/29/2018 Chrome Android4/17/201819

2018/3

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.allow 📋Chrome Android8/1/2017 Safari on iOS3/29/2018240
html.elements.iframe.allow.camera 📋Chrome Android1/23/2018 Safari on iOS3/29/201865
html.elements.iframe.allow.microphone 📋Chrome Android1/23/2018 Safari on iOS3/29/201865
html.elements.iframe.sandbox.allow-modals 📋Chrome Android10/14/2015 Safari on iOS3/29/2018897
html.elements.iframe.sandbox.allow-popups-to-escape-sandbox 📋Chrome Android10/14/2015 Safari on iOS3/29/2018897
html.elements.iframe.sandbox.allow-top-navigation-by-user-activation 📋Chrome Android4/25/2017 Safari on iOS3/29/2018338
html.elements.img.decoding 📋Chrome Android3/6/2018 Safari on iOS3/29/201823
html.elements.input.type_month 📋Chrome Android2/27/2013 Safari on iOS3/29/20181856
Safari: The input type is recognized, but there is no month-specific control. See bug 200416.
html.elements.link.integrity 📋Chrome Android9/1/2015 Safari on iOS3/29/2018940
html.elements.link.rel.manifest 📋Chrome Android11/12/2014 Safari on iOS3/29/20181233
html.elements.link.rel.preconnect 📋Chrome Android10/14/2015 Safari on iOS3/29/2018897
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.preload 📋Chrome Android4/13/2016 Safari on iOS3/29/2018715
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 Safari on iOS3/29/2018715
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 Safari on iOS3/29/2018715
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 Safari on iOS3/29/2018715
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 Safari on iOS3/29/2018715
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 Safari on iOS3/29/2018715
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-track Chrome Android4/13/2016 Safari on iOS3/29/2018715
html.elements.script.integrity 📋Chrome Android9/1/2015 Safari on iOS3/29/2018940
javascript.builtins.AsyncIterator 📋Chrome Android12/5/2017 Safari on iOS3/29/2018114
javascript.builtins.AsyncIterator.@@asyncIterator 📋Chrome Android12/5/2017 Safari on iOS3/29/2018114
javascript.builtins.Error.stackTraceLimit Chrome Android6/27/2012 Safari on iOS3/29/20182101
javascript.builtins.Promise.finally 📋Chrome Android12/5/2017 Safari on iOS3/29/2018114
javascript.builtins.RegExp.dotAll 📋Chrome Android10/24/2017 Safari on iOS3/29/2018156
javascript.builtins.Symbol.asyncIterator 📋Chrome Android12/5/2017 Safari on iOS3/29/2018114
javascript.operators.destructuring.rest_in_objects Chrome Android8/1/2017 Safari on iOS3/29/2018240
javascript.operators.import 📋Chrome Android12/5/2017 Safari on iOS3/29/2018114
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.object_initializer.spread_properties Chrome Android8/1/2017 Safari on iOS3/29/2018240
javascript.operators.spread.spread_in_object_literals 📋Chrome Android8/1/2017 Safari on iOS3/29/2018240
javascript.regular_expressions.named_backreference 📋Chrome Android1/23/2018 Safari on iOS3/29/201865
javascript.regular_expressions.named_capturing_group 📋Chrome Android1/23/2018 Safari on iOS3/29/201865
javascript.regular_expressions.unicode_character_class_escape 📋Chrome Android1/23/2018 Safari on iOS3/29/201865

2018/1

API First Browser Date Last Browser Date Days Notes
html.global_attributes.title.multi-line_titles Safari on iOS9/19/2017 Chrome Android1/23/2018126

2017/12

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Proxy.revocable 📋Safari on iOS9/13/2016 Chrome Android12/5/2017448
javascript.statements.for_of.async_iterators Safari on iOS9/18/2013 Chrome Android12/5/20171539

2017/10

API First Browser Date Last Browser Date Days Notes
html.elements.data 📋Safari on iOS9/13/2016 Chrome Android10/24/2017406
html.elements.data.value 📋Safari on iOS9/13/2016 Chrome Android10/24/2017406
html.elements.time 📋Safari on iOS6/21/2010 Chrome Android10/24/20172682
html.elements.time.datetime Safari on iOS6/21/2010 Chrome Android10/24/20172682
javascript.grammar.template_literals.template_literal_revision Safari on iOS9/19/2017 Chrome Android10/24/201735

2017/9

API First Browser Date Last Browser Date Days Notes
html.elements.img.usemap.case_sensitive Chrome Android4/25/2017 Safari on iOS9/19/2017147
html.elements.script.nomodule 📋Chrome Android9/5/2017 Safari on iOS9/19/201714
javascript.builtins.Intl.Collator.Collator.options_caseFirst_parameter Chrome Android2/27/2013 Safari on iOS9/19/20171665
javascript.builtins.Intl.DateTimeFormat.formatToParts 📋Chrome Android3/16/2017 Safari on iOS9/19/2017187
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.operators.new_target 📋Chrome Android10/14/2015 Safari on iOS9/19/2017706
html.elements.script.type.module Safari on iOS3/27/2017 Chrome Android9/5/2017162
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).
javascript.statements.export 📋Safari on iOS3/27/2017 Chrome Android9/5/2017162
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.
javascript.statements.export.default 📋Safari on iOS3/27/2017 Chrome Android9/5/2017162
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 📋Safari on iOS3/27/2017 Chrome Android9/5/2017162
Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.Node.js: Modules must either have a filename ending in .mjs, or the nearest parent package.json file must contain "type": "module". See Node's ECMAScript Modules documentation for more details.

2017/6

API First Browser Date Last Browser Date Days Notes
html.elements.meta.http-equiv.content-language 📋Safari on iOS3/27/2017 Chrome Android6/6/201771
html.elements.meta.http-equiv.content-security-policy 📋Safari on iOS3/27/2017 Chrome Android6/6/201771
html.elements.meta.http-equiv.content-type 📋Safari on iOS3/27/2017 Chrome Android6/6/201771

2017/4

API First Browser Date Last Browser Date Days Notes
javascript.builtins.String.toLocaleLowerCase.locales_parameter Safari on iOS9/13/2016 Chrome Android4/25/2017224
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.String.toLocaleUpperCase.locales_parameter Safari on iOS9/13/2016 Chrome Android4/25/2017224
Deno: Only the locale data for en-US is available.Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.functions.arrow_functions.trailing_comma Safari on iOS9/13/2016 Chrome Android4/25/2017224
javascript.grammar.trailing_commas.trailing_commas_in_functions Safari on iOS9/13/2016 Chrome Android4/25/2017224
javascript.operators.function.trailing_comma Safari on iOS9/13/2016 Chrome Android4/25/2017224
javascript.operators.generator_function.trailing_comma Safari on iOS9/13/2016 Chrome Android4/25/2017224
javascript.statements.function.trailing_comma_in_parameters Safari on iOS9/13/2016 Chrome Android4/25/2017224
javascript.statements.generator_function.trailing_comma_in_parameters Safari on iOS9/13/2016 Chrome Android4/25/2017224

2017/3

API First Browser Date Last Browser Date Days Notes
html.elements.a.rel.noopener 📋Chrome Android3/9/2016 Safari on iOS3/27/2017383
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.download 📋Chrome Android10/19/2016 Safari on iOS3/27/2017159
html.elements.area.rel.noopener 📋Chrome Android3/9/2016 Safari on iOS3/27/2017383
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.form.novalidate 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.hr.color Chrome Android2/26/2014 Safari on iOS3/27/20171125
html.elements.input.minlength 📋Chrome Android1/21/2015 Safari on iOS3/27/2017796
html.elements.meter 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.high 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.low 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.max 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.min 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.optimum 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.meter.value 📋Chrome Android6/27/2012 Safari on iOS3/27/20171734
html.elements.textarea.minlength 📋Chrome Android1/21/2015 Safari on iOS3/27/2017796
javascript.builtins.AsyncFunction 📋Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.builtins.AsyncFunction.AsyncFunction 📋Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.builtins.Date.UTC.optional_monthIndex Chrome Android6/27/2012 Safari on iOS3/27/20171734
javascript.builtins.Intl.getCanonicalLocales 📋Chrome Android10/19/2016 Safari on iOS3/27/2017159
javascript.builtins.Object.entries 📋Chrome Android10/19/2016 Safari on iOS3/27/2017159
javascript.builtins.Object.values 📋Chrome Android10/19/2016 Safari on iOS3/27/2017159
javascript.functions.method_definitions.async_methods Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.operators.async_function 📋Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.operators.await 📋Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.operators.exponentiation 📋Chrome Android7/27/2016 Safari on iOS3/27/2017243
javascript.operators.exponentiation_assignment 📋Chrome Android7/27/2016 Safari on iOS3/27/2017243
javascript.statements.async_function 📋Chrome Android12/6/2016 Safari on iOS3/27/2017111
javascript.statements.class 📋Chrome Android3/9/2016 Safari on iOS3/27/2017383
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.
html.elements.input.type_range 📋Safari on iOS10/12/2011 Chrome Android3/16/20171982
WebView Android: Pre-Chromium Android WebView recognizes the range type, but doesn't implement a range-specific control.
javascript.builtins.String.padEnd 📋Safari on iOS9/13/2016 Chrome Android3/16/2017184
javascript.builtins.String.padStart 📋Safari on iOS9/13/2016 Chrome Android3/16/2017184

2016/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Object.getOwnPropertyDescriptors 📋Safari on iOS9/13/2016 Chrome Android10/19/201636

2016/9

API First Browser Date Last Browser Date Days Notes
html.elements.audio.crossorigin 📋Chrome Android2/26/2014 Safari on iOS9/13/2016930
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.input.capture 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
html.elements.link.as 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
html.elements.link.crossorigin 📋Chrome Android4/2/2014 Safari on iOS9/13/2016895
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.slot 📋Chrome Android9/7/2016 Safari on iOS9/13/20166
html.elements.slot.name Chrome Android9/7/2016 Safari on iOS9/13/20166
html.elements.video.autoplay 📋Chrome Android6/27/2012 Safari on iOS9/13/20161539
html.elements.video.crossorigin 📋Chrome Android2/26/2014 Safari on iOS9/13/2016930
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.global_attributes.slot 📋Chrome Android9/7/2016 Safari on iOS9/13/20166
javascript.builtins.Array.@@iterator 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
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 Safari on iOS9/13/201697
javascript.builtins.Array.@@unscopables 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
javascript.builtins.ArrayBuffer.@@species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.Date.@@toPrimitive 📋Chrome Android12/2/2015 Safari on iOS9/13/2016286
javascript.builtins.Date.toLocaleDateString.locales_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Date.toLocaleString.locales_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Date.toLocaleTimeString.locales_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Float32Array.Float32Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Float64Array.Float64Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Function.@@hasInstance 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Function.length.configurable_true Chrome Android5/27/2015 Safari on iOS9/13/2016475
javascript.builtins.Function.name.configurable_true Chrome Android5/27/2015 Safari on iOS9/13/2016475
javascript.builtins.Function.name.inferred_names Chrome Android6/8/2016 Safari on iOS9/13/201697
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.Generator 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Generator.next 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Generator.return 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Generator.throw 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.GeneratorFunction 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.GeneratorFunction.GeneratorFunction 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Int16Array.Int16Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Int32Array.Int32Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Int8Array.Int8Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Intl 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
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_ignorePunctuation_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator.Collator.options_localeMatcher_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator.Collator.options_numeric_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator.Collator.options_sensitivity_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator.Collator.options_usage_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.Collator.compare 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the DateTimeFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.locales_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.DateTimeFormat.format 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/2016847
javascript.builtins.Intl.DateTimeFormat.supportedLocalesOf 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.NumberFormat 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.locales_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
javascript.builtins.Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter Chrome Android2/27/2013 Safari on iOS9/13/20161294
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the NumberFormat instance silently falls back to en-US. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Intl.NumberFormat.format 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
Edge: Before Edge 18, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".Internet Explorer: In Internet Explorer 11, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".Node.js: Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.
javascript.builtins.Intl.NumberFormat.resolvedOptions 📋Chrome Android2/27/2013 Safari on iOS9/13/20161294
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 Safari on iOS9/13/20161294
Node.js: Before version 13.0.0, only the locale data for en-US is available by default. To make full ICU (locale) data available before version 13, see Node.js documentation on the --with-intl option and how to provide the data.
javascript.builtins.Iterator 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
javascript.builtins.Iterator.@@iterator 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Map.@@iterator 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Map.@@species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.Number.toLocaleString.locales_parameter Chrome Android4/3/2013 Safari on iOS9/13/20161259
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 Safari on iOS9/13/20161259
javascript.builtins.Promise.@@species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.Proxy 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.Proxy 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.apply 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.construct 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.defineProperty 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.deleteProperty 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.get 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.getOwnPropertyDescriptor 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.getPrototypeOf 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.has 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.isExtensible 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.ownKeys 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
Firefox: In Firefox 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.Firefox for Android: In Firefox for Android 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.
javascript.builtins.Proxy.handler.preventExtensions 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.set 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Proxy.handler.setPrototypeOf 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.apply 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.construct 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.defineProperty 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.deleteProperty 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.get 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.getOwnPropertyDescriptor 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.getPrototypeOf 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.has 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.isExtensible 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.ownKeys 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.preventExtensions 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.set 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.Reflect.setPrototypeOf 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.RegExp.@@match 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.RegExp.@@replace 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.RegExp.@@search 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.RegExp.@@species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.RegExp.@@split 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.RegExp.sticky 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.RegExp.sticky.anchored_sticky_flag Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.RegExp.sticky.prototype_accessor Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.RegExp.unicode 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
Edge: Case folding is implemented in version 13Node.js: Case folding is implemented in version 8.6.0
javascript.builtins.Set.@@species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.String.localeCompare.locales_parameter Chrome Android4/3/2013 Safari on iOS9/13/20161259
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 Safari on iOS9/13/20161259
javascript.builtins.String.normalize 📋Chrome Android4/2/2014 Safari on iOS9/13/2016895
javascript.builtins.Symbol.@@toPrimitive 📋Chrome Android12/2/2015 Safari on iOS9/13/2016286
javascript.builtins.Symbol.hasInstance 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Symbol.isConcatSpreadable 📋Chrome Android1/26/2016 Safari on iOS9/13/2016231
javascript.builtins.Symbol.iterator 📋Chrome Android5/27/2015 Safari on iOS9/13/2016475
javascript.builtins.Symbol.match 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Symbol.replace 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Symbol.search 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Symbol.species 📋Chrome Android6/8/2016 Safari on iOS9/13/201697
javascript.builtins.Symbol.split 📋Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.builtins.Symbol.toPrimitive 📋Chrome Android12/2/2015 Safari on iOS9/13/2016286
javascript.builtins.Symbol.toStringTag 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.builtins.TypedArray.@@iterator 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
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 Safari on iOS9/13/201697
javascript.builtins.TypedArray.copyWithin 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.entries 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.every 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.fill 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.filter 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.find 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.findIndex 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.forEach 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.from 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.includes 📋Chrome Android12/2/2015 Safari on iOS9/13/2016286
javascript.builtins.TypedArray.indexOf 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).indexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.iterable_in_constructor Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.TypedArray.join 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.keys 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
javascript.builtins.TypedArray.lastIndexOf 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
Firefox: Starting with Firefox 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.Firefox for Android: Starting with Firefox for Android 47, this method will no longer return -0. For example, new Uint8Array([0]).lastIndexOf(0, -0) will now always return +0.
javascript.builtins.TypedArray.map 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.of 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.reduce 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.reduceRight 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.reverse 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.slice 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.some 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.sort 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
javascript.builtins.TypedArray.values 📋Chrome Android10/8/2014 Safari on iOS9/13/2016706
javascript.builtins.Uint16Array.Uint16Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Uint32Array.Uint32Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Uint8Array.Uint8Array.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.iterable_allowed Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.functions.arrow_functions 📋Chrome Android9/1/2015 Safari on iOS9/13/2016378
Firefox: The initial implementation of arrow functions in Firefox made them automatically strict. This has been changed as of Firefox 24. The use of 'use strict'; is now required.Firefox: Before Firefox 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.Firefox for Android: The initial implementation of arrow functions in Firefox for Android made them automatically strict. This has been changed as of Firefox for Android 24. The use of 'use strict'; is now required.Firefox for Android: Before Firefox for Android 39, a line terminator (\n) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like () \n => {} will now throw a SyntaxError in this and later versions.
javascript.functions.block_level_functions Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.functions.default_parameters 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.functions.default_parameters.destructured_parameter_with_default_value_assignment Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.functions.default_parameters.parameters_without_defaults_after_default_parameters Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.functions.rest_parameters 📋Chrome Android12/2/2015 Safari on iOS9/13/2016286
javascript.functions.rest_parameters.destructuring Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.operators.destructuring.computed_property_names Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.operators.generator_function 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.operators.yield 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox: Starting with Firefox 29, an IteratorResult object returned for completed generator function.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 29, an IteratorResult object returned for completed generator function.
javascript.operators.yield_star 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
Firefox: Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.Firefox for Android: Starting with Firefox for Android 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.
javascript.regular_expressions.character_escape.unicode Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.statements.generator_function 📋Chrome Android11/12/2014 Safari on iOS9/13/2016671
javascript.statements.generator_function.IteratorResult_object Chrome Android3/9/2016 Safari on iOS9/13/2016188
javascript.statements.generator_function.not_constructable_with_new Chrome Android4/13/2016 Safari on iOS9/13/2016153
javascript.statements.let 📋Chrome Android3/9/2016 Safari on iOS9/13/2016188
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Edge: In Edge 12 and 13, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Firefox: Before Firefox 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox: Before Firefox 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox: Firefox 54 adds support of let in workers.Firefox for Android: Before Firefox for Android 44, let is only available to code blocks in HTML wrapped in a <script type="application/javascript;version=1.7"> block (or higher version) and has different semantics (e.g. no temporal dead zone).Firefox for Android: Before Firefox for Android 46, a TypeError is thrown on redeclaration instead of a SyntaxError.Firefox for Android: Firefox for Android 54 adds support of let in workers.Internet Explorer: In Internet Explorer, let within a for loop initializer does not create a separate variable for each loop iteration as defined by ES2015. Instead, it behaves as though the loop were wrapped in a scoping block with the let immediately before the loop.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.

2016/7

API First Browser Date Last Browser Date Days Notes
javascript.functions.arguments.@@iterator 📋Safari on iOS9/16/2015 Chrome Android7/27/2016315

2016/6

API First Browser Date Last Browser Date Days Notes
html.global_attributes.contenteditable.plaintext-only Safari on iOS11/22/2010 Chrome Android6/8/20162025
javascript.statements.for_of.closing_iterators Safari on iOS9/18/2013 Chrome Android6/8/2016994

2016/3

API First Browser Date Last Browser Date Days Notes
html.elements.img.sizes 📋Chrome Android10/8/2014 Safari on iOS3/21/2016530
html.elements.picture 📋Chrome Android10/8/2014 Safari on iOS3/21/2016530
html.elements.source.sizes 📋Chrome Android10/8/2014 Safari on iOS3/21/2016530
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.srcset 📋Chrome Android10/8/2014 Safari on iOS3/21/2016530
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.global_attributes.spellcheck 📋Chrome Android12/2/2015 Safari on iOS3/21/2016110
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>.
javascript.functions.get.computed_property_names Chrome Android10/14/2015 Safari on iOS3/21/2016159
javascript.functions.method_definitions.generator_methods_not_constructable Chrome Android4/15/2015 Safari on iOS3/21/2016341
javascript.functions.set.computed_property_names Chrome Android10/14/2015 Safari on iOS3/21/2016159
javascript.operators.destructuring.rest_in_arrays Chrome Android3/9/2016 Safari on iOS3/21/201612
javascript.builtins.RegExp.flags 📋Safari on iOS9/16/2015 Chrome Android3/9/2016175
javascript.classes 📋Safari on iOS9/16/2015 Chrome Android3/9/2016175
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.classes.constructor 📋Safari on iOS9/16/2015 Chrome Android3/9/2016175
Chrome: Strict mode is required.Chrome Android: Strict mode is required.Opera: Strict mode is required.Opera Android: Strict mode is required.Samsung Internet: Strict mode is required.WebView Android: Strict mode is required.
javascript.classes.extends 📋Safari on iOS9/16/2015 Chrome Android3/9/2016175
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 📋Safari on iOS9/16/2015 Chrome Android3/9/2016175
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.operators.destructuring 📋Safari on iOS9/17/2014 Chrome Android3/9/2016539
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.

2016/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.RegExp.global.prototype_accessor Safari on iOS6/29/2007 Chrome Android1/26/20163133
javascript.builtins.RegExp.ignoreCase.prototype_accessor Safari on iOS6/29/2007 Chrome Android1/26/20163133
javascript.builtins.RegExp.multiline.prototype_accessor Safari on iOS6/29/2007 Chrome Android1/26/20163133
javascript.builtins.RegExp.source.prototype_accessor Safari on iOS6/29/2007 Chrome Android1/26/20163133

2015/12

API First Browser Date Last Browser Date Days Notes
html.elements.rtc 📋Safari on iOS9/17/2014 Chrome Android12/2/2015441
javascript.builtins.Array.includes 📋Safari on iOS9/16/2015 Chrome Android12/2/201577
javascript.operators.object_initializer.computed_property_names Safari on iOS9/17/2014 Chrome Android12/2/2015441
javascript.operators.object_initializer.shorthand_method_names Safari on iOS9/16/2015 Chrome Android12/2/201577
javascript.operators.object_initializer.shorthand_property_names Safari on iOS9/16/2015 Chrome Android12/2/201577

2015/10

API First Browser Date Last Browser Date Days Notes
javascript.operators.spread 📋Safari on iOS9/17/2014 Chrome Android10/14/2015392
javascript.operators.spread.spread_in_arrays 📋Safari on iOS9/17/2014 Chrome Android10/14/2015392
javascript.operators.spread.spread_in_function_calls 📋Safari on iOS9/17/2014 Chrome Android10/14/2015392

2015/9

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.copyWithin 📋Chrome Android9/1/2015 Safari on iOS9/16/201515
javascript.builtins.Array.from 📋Chrome Android9/1/2015 Safari on iOS9/16/201515
javascript.builtins.Array.of 📋Chrome Android11/12/2014 Safari on iOS9/16/2015308
javascript.builtins.Map.Map.iterable_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Map.Map.null_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Map.key_equality_for_zeros Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Math.sign 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Number.EPSILON 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.MAX_SAFE_INTEGER 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.MIN_SAFE_INTEGER 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.isFinite 📋Chrome Android2/27/2013 Safari on iOS9/16/2015931
javascript.builtins.Number.isInteger 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.isNaN 📋Chrome Android2/27/2013 Safari on iOS9/16/2015931
javascript.builtins.Number.isSafeInteger 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.parseFloat 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Number.parseInt 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Object.assign 📋Chrome Android9/1/2015 Safari on iOS9/16/201515
javascript.builtins.Object.getOwnPropertySymbols 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Object.is 📋Chrome Android2/27/2013 Safari on iOS9/16/2015931
javascript.builtins.Object.preventExtensions.ES2015_behavior Chrome Android7/29/2015 Safari on iOS9/16/201549
javascript.builtins.Object.setPrototypeOf 📋Chrome Android4/2/2014 Safari on iOS9/16/2015532
javascript.builtins.Set.@@iterator 📋Chrome Android5/27/2015 Safari on iOS9/16/2015112
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.Set.Set.iterable_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Set.Set.null_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Set.key_equality_for_zeros Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.String.@@iterator 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
Firefox: A placeholder property named @@iterator is used.Firefox: A placeholder property named iterator is used.Firefox for Android: A placeholder property named @@iterator is used.Firefox for Android: A placeholder property named iterator is used.
javascript.builtins.String.codePointAt 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.builtins.String.endsWith 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.String.fromCodePoint 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.builtins.String.includes 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.builtins.String.raw 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.builtins.String.repeat 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.String.startsWith 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.Symbol 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
Edge: Edge 12 included Symbol properties in JSON.stringify() output.
javascript.builtins.Symbol.Symbol 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Symbol.for 📋Chrome Android1/21/2015 Safari on iOS9/16/2015238
javascript.builtins.Symbol.keyFor 📋Chrome Android1/21/2015 Safari on iOS9/16/2015238
javascript.builtins.Symbol.toString 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Symbol.unscopables 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.Symbol.valueOf 📋Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.WeakMap.WeakMap.iterable_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.WeakSet 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.WeakSet.WeakSet 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.WeakSet.WeakSet.iterable_allowed Chrome Android10/8/2014 Safari on iOS9/16/2015343
javascript.builtins.WeakSet.WeakSet.null_allowed Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.WeakSet.add 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.WeakSet.delete 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.builtins.WeakSet.has 📋Chrome Android7/16/2014 Safari on iOS9/16/2015427
javascript.functions.method_definitions 📋Chrome Android11/12/2014 Safari on iOS9/16/2015308
javascript.grammar.binary_numeric_literals 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.grammar.octal_numeric_literals 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.grammar.shorthand_object_literals Chrome Android5/27/2015 Safari on iOS9/16/2015112
javascript.grammar.template_literals 📋Chrome Android3/11/2015 Safari on iOS9/16/2015189
javascript.grammar.unicode_point_escapes 📋Chrome Android7/29/2015 Safari on iOS9/16/201549
javascript.builtins.Array.fill 📋Safari on iOS9/17/2014 Chrome Android9/1/2015349
javascript.builtins.Array.find 📋Safari on iOS9/17/2014 Chrome Android9/1/2015349
javascript.builtins.Array.findIndex 📋Safari on iOS9/17/2014 Chrome Android9/1/2015349

2015/5

API First Browser Date Last Browser Date Days Notes
html.global_attributes.autocapitalize 📋Safari on iOS10/12/2011 Chrome Android5/27/20151323

2015/4

API First Browser Date Last Browser Date Days Notes
javascript.operators.class 📋Safari on iOS9/18/2013 Chrome Android4/15/2015574
javascript.operators.super 📋Safari on iOS9/18/2013 Chrome Android4/15/2015574

2014/10

API First Browser Date Last Browser Date Days Notes
javascript.builtins.Array.entries 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Array.keys 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.Map 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.clear 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.delete 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.entries 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.forEach 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.get 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.has 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.keys 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Map.set 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
Internet Explorer: Returns 'undefined' instead of the 'Map' object.
javascript.builtins.Map.size 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
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 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.acosh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.asinh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.atanh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.cbrt 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.clz32 📋Safari on iOS9/18/2013 Chrome Android10/8/2014385
javascript.builtins.Math.cosh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.expm1 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.fround 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.hypot 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.log10 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.log1p 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.log2 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.sinh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.tanh 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Math.trunc 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.Set 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.add 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
Internet Explorer: Returns 'undefined' instead of the 'Set' object.
javascript.builtins.Set.clear 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.delete 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.entries 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.forEach 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.has 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.keys 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.builtins.Set.size 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
Firefox: From Firefox 13 to Firefox 18, the size property was implemented as a Set.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.Firefox for Android: From Firefox for Android 14 to Firefox for Android 18, the size property was implemented as a Set.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.
javascript.builtins.Set.values 📋Safari on iOS9/17/2014 Chrome Android10/8/201421
javascript.statements.for_of 📋Safari on iOS9/18/2013 Chrome Android10/8/2014385
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").

2014/9

API First Browser Date Last Browser Date Days Notes
html.elements.img.srcset 📋Chrome Android4/2/2014 Safari on iOS9/17/2014168
html.elements.template 📋Chrome Android4/3/2013 Safari on iOS9/17/2014532
javascript.builtins.Promise 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.Promise.Promise 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
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 Safari on iOS9/17/2014245
javascript.builtins.Promise.catch 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.Promise.race 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.Promise.reject 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.Promise.resolve 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.Promise.then 📋Chrome Android1/15/2014 Safari on iOS9/17/2014245
javascript.builtins.WeakMap 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
javascript.builtins.WeakMap.WeakMap 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
javascript.builtins.WeakMap.WeakMap.null_allowed Chrome Android7/16/2014 Safari on iOS9/17/201463
javascript.builtins.WeakMap.delete 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.get 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.
javascript.builtins.WeakMap.has 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
Firefox: Before Firefox 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.Firefox for Android: Before Firefox for Android 38, this method threw a TypeError when the key parameter was not an object. This has been fixed in version 38 and later to return false as per the ES2015 standard.
javascript.builtins.WeakMap.set 📋Chrome Android7/16/2014 Safari on iOS9/17/201463
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.

2014/1

API First Browser Date Last Browser Date Days Notes
javascript.builtins.ArrayBuffer.isView 📋Safari on iOS9/18/2013 Chrome Android1/15/2014119

2013/10

API First Browser Date Last Browser Date Days Notes
html.elements.video.muted 📋Safari on iOS11/22/2010 Chrome Android10/2/20131045

2013/9

API First Browser Date Last Browser Date Days Notes
html.elements.main 📋Chrome Android4/3/2013 Safari on iOS9/18/2013168
html.elements.output 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
html.elements.output.for 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
html.elements.output.form 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
html.elements.output.name 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
html.elements.progress 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
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 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
html.elements.progress.value 📋Chrome Android6/27/2012 Safari on iOS9/18/2013448
javascript.builtins.Array.toLocaleString.locales_parameter Chrome Android2/27/2013 Safari on iOS9/18/2013203
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 Safari on iOS9/18/2013203
javascript.builtins.Date.toLocaleDateString.iana_time_zone_names Chrome Android2/27/2013 Safari on iOS9/18/2013203
javascript.builtins.Date.toLocaleString.iana_time_zone_names Chrome Android2/27/2013 Safari on iOS9/18/2013203
javascript.builtins.Date.toLocaleTimeString.iana_time_zone_names Chrome Android2/27/2013 Safari on iOS9/18/2013203
javascript.builtins.Math.imul 📋Chrome Android7/10/2013 Safari on iOS9/18/201370

2013/2

API First Browser Date Last Browser Date Days Notes
html.elements.fieldset.disabled 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
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.name 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.elements.iframe.srcdoc 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.elements.input.type_date 📋Safari on iOS10/12/2011 Chrome Android2/27/2013504
html.elements.input.type_datetime-local 📋Safari on iOS10/12/2011 Chrome Android2/27/2013504
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_time 📋Safari on iOS10/12/2011 Chrome Android2/27/2013504
html.elements.script.crossorigin 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
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.track 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
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 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.elements.track.kind 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.elements.track.label 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.elements.track.src 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
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 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
html.global_attributes.translate 📋Safari on iOS9/10/2012 Chrome Android2/27/2013170
javascript.builtins.parseInt.leading_zero_strings_as_decimal Safari on iOS9/10/2012 Chrome Android2/27/2013170
javascript.statements.const 📋Safari on iOS10/12/2011 Chrome Android2/27/2013504
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.

2012/9

API First Browser Date Last Browser Date Days Notes
html.elements.a.ping 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.ping 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.audio.muted 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.bdi 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.details 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.open Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.dfn 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.form.autocomplete 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.iframe.sandbox.allow-popups 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.img.crossorigin 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.input.autocomplete 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.input.dirname 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.link.sizes 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.ol.reversed 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.summary 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.textarea.dirname 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.textarea.wrap 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
html.elements.video.loop 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
javascript.builtins.ArrayBuffer.slice 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.Error.stack Chrome Android6/27/2012 Safari on iOS9/10/201275
javascript.builtins.Function.apply.generic_arrays_as_arguments Chrome Android6/27/2012 Safari on iOS9/10/201275
javascript.builtins.Function.bind 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
javascript.builtins.Function.name 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
javascript.builtins.Object.defineProperty 📋Chrome Android6/27/2012 Safari on iOS9/10/201275
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.

2012/6

API First Browser Date Last Browser Date Days Notes
html.elements.a 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.coords 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.Firefox for Android: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.
html.elements.a.href 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.href.href_top Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.a.hreflang 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.name 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.rel 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.rel.noreferrer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)
html.elements.a.rev 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.shape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.Firefox for Android: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.
html.elements.a.target 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.a.type 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.abbr 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.acronym 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.address 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.alt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.coords 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.href 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.nohref 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.rel 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.area.rel.noreferrer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)
html.elements.area.shape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.area.target 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.article 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.aside 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.audio 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
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 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.audio.loop 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.audio.preload 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
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 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.b 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.base 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
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 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.base.href.relative_url Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.base.target 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.bdo 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.big 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.blockquote 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.blockquote.cite Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.body.alink Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body.background Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body.bgcolor Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body.bottommargin Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body.rightmargin Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.body.topmargin Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.br 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.br.clear Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.button 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.button.disabled 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.button.form Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.formaction Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.formenctype Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.formmethod Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.formnovalidate Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.formtarget Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.button.name Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.button.type Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.button.value Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.canvas 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.caption.align Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.center 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.code 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.col 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.col.align 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.col.span 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.col.valign 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.col.width 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.colgroup 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.colgroup.align 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.colgroup.span 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.colgroup.valign 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.colgroup.width 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.dd 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, this element was implemented using the HTMLSpanElement interface instead of HTMLElement.
html.elements.del 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.del.cite Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.del.datetime Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.dir 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.dir.compact Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.div 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.div.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.dl 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.dt 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.em 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.align 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.height 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.name 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.src 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.embed.width 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.fieldset 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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.form 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.figcaption 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.figure 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.font 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.font.color Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.font.face Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.font.size Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.footer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.form 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.accept-charset 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.action 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.enctype 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.method 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.name 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.form.target 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.frameborder Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.marginheight Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.marginwidth Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.name Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.noresize Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.scrolling Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frame.src Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frameset 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frameset.cols Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.frameset.rows Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.h1 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.h2 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.h3 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.h4 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.h5 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.h6 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.head 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.header 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.hgroup 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.hr 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.hr.align Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.hr.noshade Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.hr.size Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.hr.width Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.html 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.html.version 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.html.xmlns Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.i 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.iframe 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.frameborder 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.height 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.longdesc 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.marginheight 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.marginwidth 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.name 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.sandbox 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.iframe.sandbox.allow-forms 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.iframe.sandbox.allow-same-origin 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
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 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.iframe.sandbox.allow-top-navigation 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.iframe.scrolling 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.iframe.src 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.iframe.width 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.img.align 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.alt 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.border 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.height 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.hspace 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.ismap 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.longdesc 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.name 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.src 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.img.usemap 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.vspace 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.img.width 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.input 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.alt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.checked 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.disabled 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.form 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.formaction 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.input.formenctype 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.input.formmethod 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.input.formnovalidate 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.formtarget 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.input.max 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.maxlength 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.min 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.multiple 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.input.name 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.pattern 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.placeholder 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.input.readonly 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.required 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.size 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.src 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.step 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
html.elements.input.type_button 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_checkbox 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_email 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
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_file 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_image 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_number 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
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_password 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_radio 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_reset 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.input.type_submit 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
Chrome: The field type doesn't demonstrate any special behavior.Safari: The field type doesn't demonstrate any special behavior.
html.elements.input.type_text 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.type_url 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.input.usemap 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.ins 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.ins.cite Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.ins.datetime Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.kbd 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, creating a <kbd> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.label 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.label.for 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.legend 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.legend.align Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.li 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.li.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.li.value 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.charset 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.disabled 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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.href 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.hreflang 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.media 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.rel 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.link.rev 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.target 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.link.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.map 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.mark 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.marquee 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: Implements the HTMLDivElement interface.Firefox for Android: Implements the HTMLDivElement interface.
html.elements.marquee.behavior Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.direction Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.height Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.hspace Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.loop Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.scrollamount Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.scrolldelay Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.truespeed Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.vspace Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.marquee.width Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.menu 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.meta 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.meta.charset 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.meta.content 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.meta.http-equiv 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.meta.http-equiv.refresh 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.meta.name 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.meta.name.viewport 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.name.viewport.initial-scale 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.name.viewport.maximum-scale 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.name.viewport.minimum-scale 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.name.viewport.user-scalable 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.name.viewport.width 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.meta.scheme 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.nav 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.nobr 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.noembed 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.noframes 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.noscript 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.archive 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.border 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.classid 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.codetype 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.data 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.declare 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.form 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.height 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.name 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.standby 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.type 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.usemap 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.object.width 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.ol 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.ol.compact Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.ol.start 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.ol.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.optgroup 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.optgroup.label 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.option 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.option.disabled 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.option.label 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.option.value 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.p 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.param 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.param.name Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.param.type Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.param.value Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.param.valuetype Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.plaintext 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.pre 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.pre.width Safari on iOS7/11/2008 Chrome Android6/27/20121447
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.q 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.q.cite 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.rb 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
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 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.rt 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
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.ruby 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.s 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.samp 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.script 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.script.defer 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
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.src 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.script.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.section 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.elements.select 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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.disabled 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.select.form 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.select.multiple 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.select.name 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.select.required 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.small 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.source 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
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.media 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
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.src 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.source.type 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.span 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.strike 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
Firefox: Before Firefox 4, creating a <strong> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.style 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.style.media 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.style.type 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.sup 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.table 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.align Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.border Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.cellpadding Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.cellspacing Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.frame Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.rules Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.summary Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.table.width Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tbody 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tbody.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.tbody.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tbody.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.td 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.abbr Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.td.axis Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.colspan Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.headers Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.rowspan Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.scope Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.td.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.td.width Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.textarea 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
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.cols 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.textarea.disabled 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.textarea.form 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.textarea.maxlength 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
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.name 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.textarea.placeholder 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.textarea.readonly 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.textarea.required 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.elements.textarea.rows 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.tfoot 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tfoot.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.tfoot.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tfoot.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.th 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.abbr Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.th.axis Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.colspan Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.headers Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.rowspan Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.scope Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.th.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.th.width Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.thead 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.thead.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.thead.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.title 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tr 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tr.align Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.tr.bgcolor Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.elements.tr.valign Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.tt 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.ul 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.ul.compact 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.elements.ul.type 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.var 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.video 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.video.controls 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.video.height 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.video.poster 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.video.preload 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
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 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.video.width 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
html.elements.wbr 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.elements.xmp 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
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 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.global_attributes.class 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.global_attributes.contenteditable 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.global_attributes.data_attributes 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
html.global_attributes.dir 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.global_attributes.draggable 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
html.global_attributes.hidden 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
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.id 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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.lang 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
html.global_attributes.style 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
html.global_attributes.tabindex 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
html.global_attributes.title 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.builtins.Array 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.Array 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.concat 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.every 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.filter 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.forEach 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.indexOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.isArray 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Array.join 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.lastIndexOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.length 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.map 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.pop 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.push 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.reduce 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.builtins.Array.reduceRight 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.builtins.Array.reverse 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.shift 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.slice 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.some 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.sort 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.splice 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Internet Explorer: From Internet Explorer 5.5 through 8, all elements of the array will not be deleted if deleteCount is omitted. This behavior was fixed in Internet Explorer 9.
javascript.builtins.Array.toLocaleString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Array.unshift 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.ArrayBuffer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.ArrayBuffer.ArrayBuffer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.ArrayBuffer.byteLength 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Boolean 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Boolean.Boolean 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Boolean.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Boolean.valueOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.DataView 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.DataView 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.buffer 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.byteLength 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.byteOffset 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getFloat32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getFloat64 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getInt16 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getInt32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getInt8 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getUint16 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getUint32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.getUint8 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setFloat32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setFloat64 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setInt16 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setInt32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setInt8 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setUint16 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setUint32 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.DataView.setUint8 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Date 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Internet Explorer: The ISO8601 Date Format is not supported in Internet Explorer 8 or earlier.
javascript.builtins.Date.Date 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.UTC 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getDate 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getDay 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getFullYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getHours 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getMilliseconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getMinutes 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getMonth 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getSeconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getTime 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getTimezoneOffset 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCDate 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCDay 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCFullYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCHours 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCMilliseconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCMinutes 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCMonth 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getUTCSeconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.getYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.now 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
javascript.builtins.Date.parse 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.parse.iso_8601 Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Date.setDate 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setFullYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setHours 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setMilliseconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setMinutes 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setMonth 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setSeconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setTime 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCDate 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCFullYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCHours 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCMilliseconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCMinutes 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCMonth 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setUTCSeconds 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.setYear 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toDateString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toGMTString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toISOString 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.builtins.Date.toJSON 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.builtins.Date.toLocaleDateString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toLocaleString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toLocaleTimeString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toTimeString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.toUTCString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Date.valueOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Error 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Error.Error 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Error.message 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Error.name 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Error.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.EvalError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.EvalError.EvalError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Float32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Float32Array.Float32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Float32Array.Float32Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Float64Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Float64Array.Float64Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Float64Array.Float64Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Function 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.Function 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.apply 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.arguments Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.call 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Node.js: When calling this method, thisArg does not default to the global object.
javascript.builtins.Function.caller Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.length 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Function.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Infinity 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Int16Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int16Array.Int16Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int16Array.Int16Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Int32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int32Array.Int32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int32Array.Int32Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Int8Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int8Array.Int8Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Int8Array.Int8Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.JSON 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
javascript.builtins.JSON.parse 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
javascript.builtins.JSON.stringify 📋Safari on iOS6/21/2010 Chrome Android6/27/2012737
javascript.builtins.Math 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.E 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.LN10 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.LN2 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.LOG10E 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.LOG2E 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.PI 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.SQRT1_2 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.SQRT2 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.abs 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.acos 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.asin 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.atan 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.atan2 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.ceil 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.cos 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.exp 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.floor 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.log 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.max 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.min 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.pow 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.random 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.round 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.sin 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.sqrt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Math.tan 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.NaN 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.MAX_VALUE 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.MIN_VALUE 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.NEGATIVE_INFINITY 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.NaN 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.Number 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.POSITIVE_INFINITY 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.toExponential 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.toFixed 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.toLocaleString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Edge: Before Edge 18, numbers are rounded to 15 decimal digits. For example, (1000000000000005).toLocaleString('en-US') returns "1,000,000,000,000,010".Internet Explorer: In Internet Explorer 11, numbers are rounded to 15 decimal digits. For example, (1000000000000005).toLocaleString('en-US') returns "1,000,000,000,000,010".
javascript.builtins.Number.toPrecision 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Number.valueOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.Object 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.constructor 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.create 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.defineGetter 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
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 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.defineSetter 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: Starting with Firefox 48, this method can no longer be called at the global scope without any object. A TypeError will be thrown otherwise. Previously, the global object was used in these cases automatically, but this is no longer the case.
javascript.builtins.Object.freeze 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.getOwnPropertyDescriptor 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
Internet Explorer: In Internet Explorer 8, this was only supported on DOM objects and with some non-standard behaviors. This was later fixed in Internet Explorer 9.
javascript.builtins.Object.getOwnPropertyNames 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.getPrototypeOf 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.hasOwnProperty 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.isExtensible 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.isFrozen 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.isPrototypeOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.isSealed 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.keys 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.lookupGetter 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.lookupSetter 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.preventExtensions 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.propertyIsEnumerable 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.proto 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.seal 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Object.toLocaleString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Object.valueOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RangeError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RangeError.RangeError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.ReferenceError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.ReferenceError.ReferenceError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.RegExp 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.compile 📋Safari on iOS7/11/2008 Chrome Android6/27/20121447
javascript.builtins.RegExp.exec 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.global 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.ignoreCase 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.input 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.lastIndex 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.lastMatch 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.lastParen 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.leftContext 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.multiline 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.n 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.rightContext 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.source 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.source.empty_regex_string Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.RegExp.test 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.RegExp.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.String 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.anchor 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Firefox: Starting with version 17, the quotation mark (") is replaced by its HTML reference character (") in strings supplied for the name parameter.
javascript.builtins.String.big 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.blink 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.bold 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.charAt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.charCodeAt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.concat 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.fixed 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.fontcolor 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.fontsize 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.fromCharCode 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.indexOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.italics 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.lastIndexOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.length 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.link 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.localeCompare 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.match 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.replace 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
Internet Explorer: A replacement function as second argument is not supported.
javascript.builtins.String.search 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.slice 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.small 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.split 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.strike 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.sub 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.substr 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.substring 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.sup 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.toLocaleLowerCase 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.toLocaleUpperCase 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.toLowerCase 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.toString 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.toUpperCase 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.trim 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.String.unicode_code_point_escapes Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.String.valueOf 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.SyntaxError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.SyntaxError.SyntaxError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.TypeError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.TypeError.TypeError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.TypedArray 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.BYTES_PER_ELEMENT 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.buffer 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.byteLength 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.byteOffset 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.TypedArray.index_properties_not_consulting_prototype Safari on iOS10/12/2011 Chrome Android6/27/2012259
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.length 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.name 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.named_properties Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.TypedArray.set 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.subarray 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.TypedArray.toLocaleString 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.TypedArray.toString 📋Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.URIError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.URIError.URIError 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.Uint16Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint16Array.Uint16Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint16Array.Uint16Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Uint32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint32Array.Uint32Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint32Array.Uint32Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Uint8Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint8Array.Uint8Array 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint8Array.Uint8Array.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.Uint8ClampedArray 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.builtins.Uint8ClampedArray.Uint8ClampedArray.constructor_without_parameters Safari on iOS10/12/2011 Chrome Android6/27/2012259
javascript.builtins.decodeURI 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.decodeURIComponent 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.encodeURI 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.encodeURIComponent 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.escape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.eval 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.isFinite 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.isNaN 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.parseFloat 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.parseInt 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.undefined 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.builtins.unescape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions.arguments 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions.arguments.callee 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions.arguments.length 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions.get 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.functions.set 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.array_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.boolean_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.decimal_numeric_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.hexadecimal_escape_sequences 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.hexadecimal_numeric_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.null_literal 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.regular_expression_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.string_literals 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.trailing_commas 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.trailing_commas.trailing_commas_in_object_literals Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.grammar.unicode_escape_sequences 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.addition 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.addition_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_and 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_and_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_not 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_or 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_or_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_xor 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.bitwise_xor_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.comma 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.conditional 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.decrement 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.operators.delete 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.division 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.division_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.equality 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.function 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.greater_than 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.greater_than_or_equal 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.grouping 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.in 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.increment 📋Safari on iOS4/3/2010 Chrome Android6/27/2012816
javascript.operators.inequality 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.instanceof 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.left_shift 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.left_shift_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.less_than 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.less_than_or_equal 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.logical_and 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.logical_not 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.logical_or 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.multiplication 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.multiplication_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.new 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.null 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.object_initializer 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.property_accessors 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.remainder 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.remainder_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.right_shift 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.right_shift_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.strict_equality 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.strict_inequality 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.subtraction 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.subtraction_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.this 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.typeof 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.unary_negation 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.unary_plus 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.unsigned_right_shift 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.unsigned_right_shift_assignment 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.operators.void 📋Safari on iOS6/17/2009 Chrome Android6/27/20121106
javascript.regular_expressions.backreference 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.capturing_group 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.character_class 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.character_class_escape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.character_escape 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.disjunction 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.input_boundary_assertion 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.literal_character 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.lookahead_assertion 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.non_capturing_group 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.quantifier 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.wildcard 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.regular_expressions.word_boundary_assertion 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.block 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.break 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.continue 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.debugger 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.statements.do_while 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.empty 📋Safari on iOS11/22/2010 Chrome Android6/27/2012583
javascript.statements.for 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.for_in 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.function 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.if_else 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.label 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.return 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.switch 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.throw 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.try_catch 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.var 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.while 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825
javascript.statements.with 📋Safari on iOS6/29/2007 Chrome Android6/27/20121825