Now Stable

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

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

Example Comparisons
Browsers
Features

Stable APIs

Below is a list of features that are in Chrome and Safari, 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 📋Safari12/12/2025 Chrome4/7/2026116

2025/12

API First Browser Date Last Browser Date Days Notes
html.elements.button.command 📋Chrome4/1/2025 Safari12/12/2025255
html.elements.button.command.request-close 📋Chrome8/5/2025 Safari12/12/2025129
html.elements.button.commandfor 📋Chrome4/1/2025 Safari12/12/2025255
html.elements.button.commandfor.implicit_anchor_reference 📋Chrome4/1/2025 Safari12/12/2025255
html.elements.details.search_match_opens Chrome1/4/2022 Safari12/12/20251438
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 📋Chrome1/10/2023 Safari12/12/20251067
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 📋Chrome1/23/2024 Safari12/12/2025689
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 📋Chrome2/7/2023 Safari12/12/20251039
html.elements.script.type.speculationrules.referrer_policy 📋Chrome3/7/2023 Safari12/12/20251011
html.elements.script.type.speculationrules.relative_to 📋Chrome1/23/2024 Safari12/12/2025689
html.elements.script.type.speculationrules.source_optional 📋Chrome2/20/2024 Safari12/12/2025661
html.elements.script.type.speculationrules.tag 📋Chrome4/29/2025 Safari12/12/2025227
html.elements.script.type.speculationrules.urls 📋Chrome1/10/2023 Safari12/12/20251067
html.elements.script.type.speculationrules.where 📋Chrome1/23/2024 Safari12/12/2025689
html.global_attributes.hidden.until-found 📋Chrome5/24/2022 Safari12/12/20251298
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 📋Chrome2/4/2025 Safari9/15/2025223
html.elements.input.popovertarget.implicit_anchor_reference 📋Chrome2/4/2025 Safari9/15/2025223
html.elements.template.shadowrootreferencetarget Chrome2/4/2025 Safari9/15/2025223

2025/3

API First Browser Date Last Browser Date Days Notes
html.elements.script.type.importmap.multiple_import_maps 📋Chrome2/4/2025 Safari3/31/202555

2024/12

API First Browser Date Last Browser Date Days Notes
html.elements.link.blocking 📋Chrome9/2/2022 Safari12/11/2024831
html.elements.script.blocking 📋Chrome9/2/2022 Safari12/11/2024831
html.elements.style.blocking 📋Chrome9/2/2022 Safari12/11/2024831

2024/9

API First Browser Date Last Browser Date Days Notes
html.elements.script.type.importmap.integrity 📋Chrome7/23/2024 Safari9/16/202455
html.elements.template.shadowrootserializable 📋Chrome5/14/2024 Safari9/16/2024125
html.global_attributes.writingsuggestions 📋Chrome4/16/2024 Safari9/16/2024153

2024/5

API First Browser Date Last Browser Date Days Notes
html.elements.template.shadowrootclonable 📋Chrome4/16/2024 Safari5/13/202427

2024/4

API First Browser Date Last Browser Date Days Notes
html.elements.input.type_range.vertical_orientation Safari5/18/2023 Chrome4/16/2024334
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 📋Safari3/27/2023 Chrome3/19/2024358

2024/1

API First Browser Date Last Browser Date Days Notes
html.elements.audio.disableremoteplayback 📋Safari3/24/2020 Chrome1/23/20241400
html.elements.video.disableremoteplayback 📋Safari3/24/2020 Chrome1/23/20241400

2023/12

API First Browser Date Last Browser Date Days Notes
html.elements.details.name Chrome12/5/2023 Safari12/11/20236
html.elements.img.fetchpriority 📋Chrome4/26/2022 Safari12/11/2023594
html.elements.link.fetchpriority 📋Chrome4/26/2022 Safari12/11/2023594
html.elements.link.imagesizes 📋Chrome3/12/2019 Safari12/11/20231735
html.elements.link.imagesrcset 📋Chrome3/12/2019 Safari12/11/20231735
html.elements.script.fetchpriority 📋Chrome4/26/2022 Safari12/11/2023594

2023/10

API First Browser Date Last Browser Date Days Notes
html.elements.hr.hr_in_select Safari9/18/2023 Chrome10/31/202343
Chrome: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Chrome: Does not expose the <hr> in the accessibility tree.Edge: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Edge: Does not expose the <hr> in the accessibility tree.Firefox: Does not expose the <hr> in the accessibility tree.Opera: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Opera: Does not expose the <hr> in the accessibility tree.Safari: Does not expose the <hr> in the accessibility tree.Safari on iOS: Does not expose the <hr> in the accessibility tree.WebView on iOS: Does not expose the <hr> in the accessibility tree.
html.elements.select.hr_in_select Safari9/18/2023 Chrome10/31/202343
Chrome: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Chrome: Does not expose the <hr> in the accessibility tree.Edge: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Edge: Does not expose the <hr> in the accessibility tree.Firefox: Does not expose the <hr> in the accessibility tree.Opera: Exposes the <hr> visually in the page only when the menu is expanded (arrowing within the collapsed menu does not show them).Opera: Does not expose the <hr> in the accessibility tree.Safari: Does not expose the <hr> in the accessibility tree.Safari on iOS: Does not expose the <hr> in the accessibility tree.WebView on iOS: Does not expose the <hr> in the accessibility tree.
html.elements.search 📋Safari9/18/2023 Chrome10/10/202322

2023/9

API First Browser Date Last Browser Date Days Notes
html.elements.button.popovertarget 📋Chrome5/30/2023 Safari9/18/2023111
html.elements.button.popovertargetaction 📋Chrome5/30/2023 Safari9/18/2023111
html.elements.iframe.sandbox.allow-downloads 📋Chrome5/19/2020 Safari9/18/20231217
html.elements.input.popovertarget 📋Chrome5/30/2023 Safari9/18/2023111
html.elements.input.popovertargetaction 📋Chrome5/30/2023 Safari9/18/2023111
html.elements.link.rel.manifest 📋Chrome11/18/2014 Safari9/18/20233226
html.elements.link.rel.modulepreload 📋Chrome4/17/2018 Safari9/18/20231980
html.elements.link.rel.modulepreload.as-script 📋Chrome4/17/2018 Safari9/18/20231980
html.global_attributes.popover 📋Chrome5/30/2023 Safari9/18/2023111

2023/5

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.sandbox.allow-storage-access-by-user-activation Safari4/12/2018 Chrome5/2/20231846

2023/3

API First Browser Date Last Browser Date Days Notes
html.elements.form.autocomplete.webauthn 📋Chrome11/29/2022 Safari3/27/2023118
html.elements.iframe.allow.screen-wake-lock 📋Chrome7/27/2020 Safari3/27/2023973
html.elements.iframe.loading 📋Chrome9/10/2019 Safari3/27/20231294
html.elements.script.type.importmap 📋Chrome3/2/2021 Safari3/27/2023755
html.elements.template.shadowrootmode 📋Chrome3/7/2023 Safari3/27/202320

2022/11

API First Browser Date Last Browser Date Days Notes
html.elements.form.rel 📋Safari3/14/2022 Chrome11/29/2022260

2022/10

API First Browser Date Last Browser Date Days Notes
html.elements.a.text_fragments Chrome2/4/2020 Safari10/24/2022993

2022/9

API First Browser Date Last Browser Date Days Notes
html.elements.textarea.placeholder.line_breaks Chrome7/16/2014 Safari9/12/20222980
html.elements.video.autoplay.requires_muted_audio Chrome5/29/2018 Safari9/12/20221567
Firefox for Android: Between versions 79 and 91, the default behavior was to block videos from autoplaying, regardless of whether audio was muted.

2022/5

API First Browser Date Last Browser Date Days Notes
html.global_attributes.inert 📋Safari5/16/2022 Chrome5/24/20228
html.global_attributes.nonce 📋Chrome9/5/2017 Safari5/16/20221714
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 📋Chrome8/26/2014 Safari3/14/20222757
html.elements.dialog.open Chrome8/26/2014 Safari3/14/20222757
html.elements.img.loading 📋Chrome9/10/2019 Safari3/14/2022916
html.global_attributes.autofocus 📋Chrome12/10/2019 Safari3/14/2022825
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).

2021/9

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.allow.display-capture 📋Safari9/19/2019 Chrome9/21/2021733
html.elements.img.aspect_ratio_computed_from_attributes Chrome12/10/2019 Safari9/20/2021650
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 📋Chrome3/12/2019 Safari9/20/2021923
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 📋Chrome4/13/2021 Safari9/20/2021160
html.elements.source.width 📋Chrome4/13/2021 Safari9/20/2021160

2021/8

API First Browser Date Last Browser Date Days Notes
html.elements.form.autocomplete.one-time-code Safari9/17/2018 Chrome8/31/20211079
html.elements.textarea.autocomplete.one-time-code Safari9/17/2018 Chrome8/31/20211079

2021/4

API First Browser Date Last Browser Date Days Notes
html.elements.datalist.input_type_date 📋Chrome6/26/2012 Safari4/26/20213226
html.elements.datalist.input_type_time 📋Chrome6/26/2012 Safari4/26/20213226
html.elements.input.type_date 📋Chrome6/26/2012 Safari4/26/20213226
html.elements.input.type_date.disables_invalid_values_in_picker_ui Chrome6/26/2012 Safari4/26/20213226
html.elements.input.type_date.list 📋Chrome6/26/2012 Safari4/26/20213226
html.elements.input.type_datetime-local 📋Chrome6/26/2012 Safari4/26/20213226
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 📋Chrome6/26/2012 Safari4/26/20213226
html.elements.input.type_time.list 📋Chrome6/26/2012 Safari4/26/20213226

2021/1

API First Browser Date Last Browser Date Days Notes
html.elements.a.implicit_noopener Safari3/25/2019 Chrome1/19/2021666
html.elements.area.implicit_noopener Safari3/25/2019 Chrome1/19/2021666

2020/9

API First Browser Date Last Browser Date Days Notes
html.elements.a.referrerpolicy 📋Chrome5/25/2016 Safari9/16/20201575
html.elements.area.referrerpolicy 📋Chrome5/25/2016 Safari9/16/20201575
html.elements.iframe.referrerpolicy 📋Chrome5/25/2016 Safari9/16/20201575
html.elements.img.referrerpolicy 📋Chrome5/25/2016 Safari9/16/20201575
html.elements.link.referrerpolicy 📋Chrome5/25/2016 Safari9/16/20201575
html.elements.script.referrerpolicy 📋Chrome10/16/2018 Safari9/16/2020701
html.elements.video.aspect_ratio_computed_from_attributes Chrome12/10/2019 Safari9/16/2020281

2020/4

API First Browser Date Last Browser Date Days Notes
html.elements.meta.name.color-scheme 📋Safari3/25/2019 Chrome4/7/2020379

2020/3

API First Browser Date Last Browser Date Days Notes
html.elements.base.href.forbid_data_javascript_urls Chrome4/19/2017 Safari3/24/20201070
html.elements.link.rel.prefetch 📋Chrome12/2/2010 Safari3/24/20203400
Chrome: Requires secure contextChrome Android: Requires secure contextEdge: Requires secure contextFirefox: Requires secure contextFirefox for Android: Requires secure contextQuest Browser: Requires secure contextOpera: Requires secure contextOpera Android: Requires secure contextSamsung Internet: Requires secure contextWebView Android: Requires secure context
html.elements.video.disablepictureinpicture 📋Chrome9/4/2018 Safari3/24/2020567
Firefox: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox for Android: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.Firefox for Android: When this attribute is set, the overlay button to disable picture-in-picture (PiP) is hidden, but the user can still enable PiP.
html.global_attributes.enterkeyhint 📋Chrome9/10/2019 Safari3/24/2020196
html.global_attributes.exportparts 📋Chrome3/12/2019 Safari3/24/2020378
html.global_attributes.part 📋Chrome3/12/2019 Safari3/24/2020378

2019/9

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.cross-origin-top-navigation-by-user-activation Chrome7/24/2018 Safari9/19/2019422
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.

2019/6

API First Browser Date Last Browser Date Days Notes
html.elements.video.playsinline 📋Safari9/20/2016 Chrome6/4/2019987

2019/3

API First Browser Date Last Browser Date Days Notes
html.elements.datalist 📋Chrome6/26/2012 Safari3/25/20192463
Firefox for Android: The dropdown menu containing available options does not appear. See bug 1535985.
html.elements.datalist.input_type_color 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.datalist.input_type_email 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.datalist.input_type_number 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.datalist.input_type_range 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.datalist.input_type_search 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.datalist.input_type_tel 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.datalist.input_type_text 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.datalist.input_type_url 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.input.type_color 📋Chrome6/26/2012 Safari3/25/20192463
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 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.input.type_email.list 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.input.type_number.list 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.input.type_range.list 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.input.type_range.tick_marks Chrome5/29/2018 Safari3/25/2019300
html.elements.input.type_search.list 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.input.type_tel.list 📋Chrome9/25/2012 Safari3/25/20192372
html.elements.input.type_text.list 📋Chrome6/26/2012 Safari3/25/20192463
html.elements.input.type_url.list 📋Chrome9/25/2012 Safari3/25/20192372
html.global_attributes.inputmode 📋Chrome4/17/2018 Safari3/25/2019342
Safari on iOS: Before iOS 13, inputmode="none" had no effect.WebView on iOS: Before iOS 13, inputmode="none" had no effect.

2018/4

API First Browser Date Last Browser Date Days Notes
html.elements.select.autocomplete 📋Safari3/21/2016 Chrome4/17/2018757
html.elements.textarea.autocomplete 📋Safari3/21/2016 Chrome4/17/2018757
html.elements.iframe.allow 📋Chrome7/25/2017 Safari4/12/2018261
html.elements.iframe.allow.camera 📋Chrome1/23/2018 Safari4/12/201879
html.elements.iframe.allow.microphone 📋Chrome1/23/2018 Safari4/12/201879
html.elements.iframe.sandbox.allow-modals 📋Chrome10/13/2015 Safari4/12/2018912
html.elements.iframe.sandbox.allow-popups-to-escape-sandbox 📋Chrome10/13/2015 Safari4/12/2018912
html.elements.iframe.sandbox.allow-top-navigation-by-user-activation 📋Chrome4/19/2017 Safari4/12/2018358
html.elements.img.decoding 📋Chrome3/6/2018 Safari4/12/201837
html.elements.input.webkitdirectory Chrome10/19/2010 Safari4/12/20182732
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.link.integrity 📋Chrome9/1/2015 Safari4/12/2018954
html.elements.link.rel.preconnect 📋Chrome10/13/2015 Safari4/12/2018912
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 📋Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
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 Chrome4/13/2016 Safari4/12/2018729
html.elements.meta.name.referrer 📋Chrome2/8/2012 Safari4/12/20182255
Chrome: Until Chrome 46, content values weren't constrained to the values listed in the spec.Chrome Android: Until Chrome Android 46, content values weren't constrained to the values listed in the spec.Firefox: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox 39.Firefox for Android: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox for Android 39.Internet Explorer: Browsers initially supported an early draft of the specification which can only use a meta tag and is only compatible with the origin value from the new spec.Quest Browser: Until Quest Browser 5.0, content values weren't constrained to the values listed in the spec.Opera: Until Opera 33, content values weren't constrained to the values listed in the spec.Opera Android: Until Opera Android 33, content values weren't constrained to the values listed in the spec.Samsung Internet: Until Samsung Internet 5.0, content values weren't constrained to the values listed in the spec.WebView Android: Until WebView Android 46, content values weren't constrained to the values listed in the spec.
html.elements.script.integrity 📋Chrome9/1/2015 Safari4/12/2018954

2018/1

API First Browser Date Last Browser Date Days Notes
html.global_attributes.title.multi-line_titles Safari9/19/2017 Chrome1/23/2018126

2017/10

API First Browser Date Last Browser Date Days Notes
html.elements.data 📋Safari9/20/2016 Chrome10/17/2017392
html.elements.data.value 📋Safari9/20/2016 Chrome10/17/2017392
html.elements.time 📋Safari10/22/2013 Chrome10/17/20171456
html.elements.time.datetime Safari10/22/2013 Chrome10/17/20171456

2017/9

API First Browser Date Last Browser Date Days Notes
html.elements.img.usemap.case_sensitive Chrome4/19/2017 Safari9/19/2017153
html.elements.script.nomodule 📋Chrome9/5/2017 Safari9/19/201714
html.elements.script.type.module Safari3/27/2017 Chrome9/5/2017162
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).

2017/6

API First Browser Date Last Browser Date Days Notes
html.elements.meta.http-equiv.content-language 📋Safari3/27/2017 Chrome6/5/201770
html.elements.meta.http-equiv.content-security-policy 📋Safari3/27/2017 Chrome6/5/201770
html.elements.meta.http-equiv.content-type 📋Safari3/27/2017 Chrome6/5/201770

2017/3

API First Browser Date Last Browser Date Days Notes
html.elements.a.download 📋Chrome9/16/2011 Safari3/27/20172019
Chrome: Starting in Chrome 65, cross-origin downloads are not supported on the <a> element.Chrome Android: Starting in Chrome Android 65, cross-origin downloads are not supported on the <a> element.Edge: Starting in Edge 79, cross-origin downloads are not supported on the <a> element.Edge: Until Edge 14 (build 14357), attempting to download data URIs caused Edge to crash (bug 7160092).Edge: Edge 17 or older didn't follow the attributes' value to determine filename (bug 7260192).Firefox for Android: The attribute's filename value only affects the suggested file name for the blob: and data: URI schemes. Other schemes ignore the suggested filename. See bug 1845642.Quest Browser: Starting in Quest Browser 5.0, cross-origin downloads are not supported on the <a> element.Opera: Starting in Opera 52, cross-origin downloads are not supported on the <a> element.Opera Android: Starting in Opera Android 47, cross-origin downloads are not supported on the <a> element.Samsung Internet: Starting in Samsung Internet 9.0, cross-origin downloads are not supported on the <a> element.WebView Android: Starting in WebView Android 65, cross-origin downloads are not supported on the <a> element.
html.elements.a.rel.noopener 📋Chrome3/2/2016 Safari3/27/2017390
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 📋Chrome10/12/2016 Safari3/27/2017166
html.elements.area.rel.noopener 📋Chrome3/2/2016 Safari3/27/2017390
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 📋Chrome3/8/2011 Safari3/27/20172211
html.elements.hr.color Chrome2/20/2014 Safari3/27/20171131
html.elements.iframe.allowfullscreen 📋Chrome10/7/2014 Safari3/27/2017902
Safari on iOS: Only available on iPad, not on iPhone.Safari on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.WebView on iOS: Only available on iPad, not on iPhone.WebView on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.
html.elements.iframe.sandbox.allow-pointer-lock 📋Chrome11/6/2012 Safari3/27/20171602
html.elements.input.minlength 📋Chrome1/21/2015 Safari3/27/2017796
html.elements.textarea.minlength 📋Chrome1/21/2015 Safari3/27/2017796

2016/9

API First Browser Date Last Browser Date Days Notes
html.elements.audio.crossorigin 📋Chrome2/20/2014 Safari9/20/2016943
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.link.as 📋Chrome4/13/2016 Safari9/20/2016160
html.elements.link.crossorigin 📋Chrome4/8/2014 Safari9/20/2016896
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 📋Chrome8/31/2016 Safari9/20/201620
html.elements.slot.name Chrome8/31/2016 Safari9/20/201620
html.elements.video.crossorigin 📋Chrome2/20/2014 Safari9/20/2016943
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 📋Chrome8/31/2016 Safari9/20/201620

2016/5

API First Browser Date Last Browser Date Days Notes
html.global_attributes.contenteditable.plaintext-only Safari6/7/2010 Chrome5/25/20162179

2016/3

API First Browser Date Last Browser Date Days Notes
html.elements.img.sizes 📋Chrome10/7/2014 Safari3/21/2016531
html.elements.picture 📋Chrome10/7/2014 Safari3/21/2016531
html.elements.source.sizes 📋Chrome10/7/2014 Safari3/21/2016531
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 📋Chrome10/7/2014 Safari3/21/2016531
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).

2015/12

API First Browser Date Last Browser Date Days Notes
html.elements.rtc 📋Safari10/16/2014 Chrome12/1/2015411

2015/10

API First Browser Date Last Browser Date Days Notes
html.elements.link.rel.dns-prefetch 📋Safari6/7/2010 Chrome10/13/20151954
Firefox: Only HTTP pages were supported.Firefox for Android: Only HTTP pages were supported.

2014/10

API First Browser Date Last Browser Date Days Notes
html.elements.img.srcset 📋Chrome4/8/2014 Safari10/16/2014191
html.elements.template 📋Chrome3/26/2013 Safari10/16/2014569

2013/10

API First Browser Date Last Browser Date Days Notes
html.elements.main 📋Chrome3/26/2013 Safari10/22/2013210
html.elements.optgroup.disabled 📋Chrome12/11/2008 Safari10/22/20131776
Safari: Before Safari 7, the attribute can be set, but has no effect.Safari on iOS: The attribute can be set, but has no effect.WebView on iOS: The attribute can be set, but has no effect.
html.elements.output 📋Chrome3/8/2011 Safari10/22/2013959
html.elements.output.for 📋Chrome3/8/2011 Safari10/22/2013959
html.elements.output.form 📋Chrome3/8/2011 Safari10/22/2013959
html.elements.output.name 📋Chrome3/8/2011 Safari10/22/2013959
html.elements.video.muted 📋Safari6/7/2010 Chrome10/1/20131212

2012/11

API First Browser Date Last Browser Date Days Notes
html.elements.track 📋Safari7/25/2012 Chrome11/6/2012104
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 📋Safari7/25/2012 Chrome11/6/2012104
html.elements.track.kind 📋Safari7/25/2012 Chrome11/6/2012104
html.elements.track.label 📋Safari7/25/2012 Chrome11/6/2012104
html.elements.track.src 📋Safari7/25/2012 Chrome11/6/2012104
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 📋Safari7/25/2012 Chrome11/6/2012104

2012/7

API First Browser Date Last Browser Date Days Notes
html.elements.a.ping 📋Chrome6/7/2011 Safari7/25/2012414
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 📋Chrome6/7/2011 Safari7/25/2012414
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 📋Chrome10/25/2011 Safari7/25/2012274
html.elements.bdi 📋Chrome12/13/2011 Safari7/25/2012225
html.elements.details 📋Chrome6/7/2011 Safari7/25/2012414
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 Chrome6/7/2011 Safari7/25/2012414
html.elements.dfn 📋Chrome10/25/2011 Safari7/25/2012274
html.elements.fieldset.disabled 📋Chrome6/26/2012 Safari7/25/201229
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 📋Chrome5/15/2012 Safari7/25/201271
html.elements.form.autocomplete 📋Chrome9/16/2011 Safari7/25/2012313
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 📋Chrome2/8/2012 Safari7/25/2012168
html.elements.iframe.srcdoc 📋Chrome6/26/2012 Safari7/25/201229
html.elements.img.crossorigin 📋Chrome8/2/2011 Safari7/25/2012358
html.elements.input.autocomplete 📋Chrome9/16/2011 Safari7/25/2012313
html.elements.input.dirname 📋Chrome2/8/2012 Safari7/25/2012168
html.elements.link.sizes 📋Chrome10/25/2011 Safari7/25/2012274
html.elements.meter 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.high 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.low 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.max 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.min 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.optimum 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.meter.value 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.ol.reversed 📋Chrome3/28/2012 Safari7/25/2012119
html.elements.progress 📋Chrome9/2/2010 Safari7/25/2012692
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 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.progress.value 📋Chrome9/2/2010 Safari7/25/2012692
html.elements.script.crossorigin 📋Chrome5/15/2012 Safari7/25/201271
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.summary 📋Chrome6/7/2011 Safari7/25/2012414
html.elements.textarea.dirname 📋Chrome2/8/2012 Safari7/25/2012168
html.elements.textarea.wrap 📋Chrome12/13/2011 Safari7/25/2012225
html.global_attributes.translate 📋Chrome5/15/2012 Safari7/25/201271

2011/12

API First Browser Date Last Browser Date Days Notes
html.elements.a.rel.noreferrer 📋Safari6/7/2010 Chrome12/13/2011554
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)
html.elements.area.rel 📋Safari6/7/2010 Chrome12/13/2011554
html.elements.area.rel.noreferrer 📋Safari6/7/2010 Chrome12/13/2011554
Internet Explorer: Only supported in IE11 in later versions of Windows 10 (creators update). (Per caniuse.com.)

2011/10

API First Browser Date Last Browser Date Days Notes
html.elements.bdo 📋Safari6/8/2009 Chrome10/25/2011869

2011/7

API First Browser Date Last Browser Date Days Notes
html.elements.button.form Chrome2/3/2011 Safari7/20/2011167
html.elements.button.formaction Chrome2/3/2011 Safari7/20/2011167
html.elements.button.formenctype Chrome2/3/2011 Safari7/20/2011167
html.elements.button.formmethod Chrome2/3/2011 Safari7/20/2011167
html.elements.button.formnovalidate Chrome2/3/2011 Safari7/20/2011167
html.elements.button.formtarget Chrome2/3/2011 Safari7/20/2011167
html.elements.figcaption 📋Chrome12/2/2010 Safari7/20/2011230
html.elements.figure 📋Chrome12/2/2010 Safari7/20/2011230
html.elements.input.type_number 📋Chrome10/19/2010 Safari7/20/2011274
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.mark 📋Chrome10/19/2010 Safari7/20/2011274
html.elements.select.required 📋Chrome3/8/2011 Safari7/20/2011134
html.global_attributes.data_attributes 📋Chrome10/19/2010 Safari7/20/2011274
html.global_attributes.hidden 📋Chrome3/8/2011 Safari7/20/2011134
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.spellcheck 📋Chrome2/3/2011 Safari7/20/2011167
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>.

2011/2

API First Browser Date Last Browser Date Days Notes
html.elements.input.formaction 📋Safari6/7/2010 Chrome2/3/2011241
html.elements.input.formenctype 📋Safari6/7/2010 Chrome2/3/2011241
html.elements.input.formmethod 📋Safari6/7/2010 Chrome2/3/2011241
html.elements.input.formtarget 📋Safari6/7/2010 Chrome2/3/2011241

2010/9

API First Browser Date Last Browser Date Days Notes
html.elements.iframe.sandbox.allow-top-navigation 📋Safari6/7/2010 Chrome9/2/201087

2010/6

API First Browser Date Last Browser Date Days Notes
html.elements.article 📋Chrome5/25/2010 Safari6/7/201013
html.elements.aside 📋Chrome5/25/2010 Safari6/7/201013
html.elements.footer 📋Chrome5/25/2010 Safari6/7/201013
html.elements.header 📋Chrome5/25/2010 Safari6/7/201013
html.elements.hgroup 📋Chrome5/25/2010 Safari6/7/201013
html.elements.iframe.sandbox 📋Chrome5/25/2010 Safari6/7/201013
html.elements.iframe.sandbox.allow-forms 📋Chrome5/25/2010 Safari6/7/201013
html.elements.iframe.sandbox.allow-same-origin 📋Chrome5/25/2010 Safari6/7/201013
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 📋Chrome5/25/2010 Safari6/7/201013
html.elements.input.formnovalidate 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.input.max 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.input.min 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.input.pattern 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.input.required 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.input.step 📋Chrome5/25/2010 Safari6/7/201013
html.elements.input.type_email 📋Chrome5/25/2010 Safari6/7/201013
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_search 📋Chrome5/25/2010 Safari6/7/201013
html.elements.nav 📋Chrome5/25/2010 Safari6/7/201013
html.elements.rb 📋Chrome5/25/2010 Safari6/7/201013
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 📋Chrome5/25/2010 Safari6/7/201013
html.elements.rt 📋Chrome5/25/2010 Safari6/7/201013
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 📋Chrome5/25/2010 Safari6/7/201013
html.elements.section 📋Chrome5/25/2010 Safari6/7/201013
html.elements.textarea.maxlength 📋Chrome1/25/2010 Safari6/7/2010133
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.placeholder 📋Chrome1/25/2010 Safari6/7/2010133
html.elements.textarea.required 📋Chrome1/25/2010 Safari6/7/2010133
html.global_attributes.draggable 📋Chrome1/25/2010 Safari6/7/2010133

2010/1

API First Browser Date Last Browser Date Days Notes
html.elements.input.type_range 📋Safari3/18/2008 Chrome1/25/2010678
WebView Android: Pre-Chromium Android WebView recognizes the range type, but doesn't implement a range-specific control.
html.elements.link.rel.icon Safari3/18/2008 Chrome1/25/2010678
Chrome: If both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.).Edge: In version 79 and later (Blink-based Edge), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Firefox: Before Firefox 83, the crossorigin attribute is not supported for rel="icon".Firefox: The media attribute is not supported for rel="icon", see bug 1603885.Opera: In version 15 and later (Blink-based Opera), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Safari: If both ICO and PNG are available, will ALWAYS use ICO file, regardless of sizes set. (Per caniuse.com.)Safari on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)WebView on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)

2009/9

API First Browser Date Last Browser Date Days Notes
html.elements.audio 📋Safari3/18/2008 Chrome9/15/2009546
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 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.audio.loop 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.audio.preload 📋Safari3/18/2008 Chrome9/15/2009546
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 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.input.placeholder 📋Safari6/8/2009 Chrome9/15/200999
html.elements.input.type_tel 📋Safari6/8/2009 Chrome9/15/200999
Chrome: The field type doesn't demonstrate any special behavior.Safari: The field type doesn't demonstrate any special behavior.
html.elements.source 📋Safari3/18/2008 Chrome9/15/2009546
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 📋Safari3/18/2008 Chrome9/15/2009546
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 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.source.type 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.autoplay 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.controls 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.height 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.loop 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.poster 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.preload 📋Safari3/18/2008 Chrome9/15/2009546
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 📋Safari3/18/2008 Chrome9/15/2009546
html.elements.video.width 📋Safari3/18/2008 Chrome9/15/2009546

2009/6

API First Browser Date Last Browser Date Days Notes
html.elements.a.href.href_top Chrome12/11/2008 Safari6/8/2009179
html.elements.abbr 📋Chrome5/21/2009 Safari6/8/200918
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.big 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.blockquote 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.blockquote.cite Chrome12/11/2008 Safari6/8/2009179
html.elements.body.alink Chrome12/11/2008 Safari6/8/2009179
html.elements.body.background Chrome12/11/2008 Safari6/8/2009179
html.elements.body.bgcolor Chrome12/11/2008 Safari6/8/2009179
html.elements.body.bottommargin Chrome12/11/2008 Safari6/8/2009179
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 Chrome12/11/2008 Safari6/8/2009179
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 Chrome12/11/2008 Safari6/8/2009179
html.elements.body.rightmargin Chrome12/11/2008 Safari6/8/2009179
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 Chrome12/11/2008 Safari6/8/2009179
html.elements.body.topmargin Chrome12/11/2008 Safari6/8/2009179
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 Chrome12/11/2008 Safari6/8/2009179
html.elements.br.clear Chrome12/11/2008 Safari6/8/2009179
html.elements.button.disabled 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.button.name Chrome12/11/2008 Safari6/8/2009179
html.elements.button.type Chrome12/11/2008 Safari6/8/2009179
html.elements.button.value Chrome12/11/2008 Safari6/8/2009179
html.elements.caption 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.caption.align Chrome12/11/2008 Safari6/8/2009179
html.elements.center 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.code 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.col 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.col.span 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.col.width 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.colgroup 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.colgroup.span 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.colgroup.width 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.dd 📋Chrome12/11/2008 Safari6/8/2009179
Firefox: Before Firefox 4, this element was implemented using the HTMLSpanElement interface instead of HTMLElement.
html.elements.del 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.dir 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.dir.compact Chrome12/11/2008 Safari6/8/2009179
html.elements.dl 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.dt 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.em 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.align 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.height 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.name 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.src 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.embed.width 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.fieldset 📋Chrome12/11/2008 Safari6/8/2009179
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.font 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.font.color Chrome12/11/2008 Safari6/8/2009179
html.elements.font.face Chrome12/11/2008 Safari6/8/2009179
html.elements.font.size Chrome12/11/2008 Safari6/8/2009179
html.elements.hr.align Chrome12/11/2008 Safari6/8/2009179
html.elements.hr.noshade Chrome12/11/2008 Safari6/8/2009179
html.elements.hr.size Chrome12/11/2008 Safari6/8/2009179
html.elements.hr.width Chrome12/11/2008 Safari6/8/2009179
html.elements.iframe 📋Chrome12/11/2008 Safari6/8/2009179
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.src 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.input.multiple 📋Chrome5/21/2009 Safari6/8/200918
html.elements.ins 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.kbd 📋Chrome12/11/2008 Safari6/8/2009179
Firefox: Before Firefox 4, creating a <kbd> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.label 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.label.for 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.legend.align Chrome12/11/2008 Safari6/8/2009179
html.elements.li.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.li.value 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.charset 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.disabled 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.hreflang 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.media 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.rev 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.target 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.link.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.meta.content 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.meta.http-equiv 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.meta.name 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.meta.scheme 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.nobr 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.noembed 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.ol 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.ol.start 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.ol.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.optgroup 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.optgroup.label 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.option 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.option.disabled 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.option.label 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.option.value 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.param 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.param.name Chrome12/11/2008 Safari6/8/2009179
html.elements.param.type Chrome12/11/2008 Safari6/8/2009179
html.elements.param.value Chrome12/11/2008 Safari6/8/2009179
html.elements.param.valuetype Chrome12/11/2008 Safari6/8/2009179
html.elements.plaintext 📋Chrome12/11/2008 Safari6/8/2009179
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.pre 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.s 📋Chrome12/11/2008 Safari6/8/2009179
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.samp 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.script.async 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.script.src 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.script.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.small 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.strike 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
Firefox: Before Firefox 4, creating a <strong> element incorrectly resulted in an HTMLSpanElement object, instead of the expected HTMLElement.
html.elements.sub 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.sup 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea.disabled 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea.form 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea.name 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea.readonly 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.textarea.rows 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.tt 📋Chrome12/11/2008 Safari6/8/2009179
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.ul 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.ul.type 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.var 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.wbr 📋Chrome12/11/2008 Safari6/8/2009179
html.elements.xmp 📋Chrome12/11/2008 Safari6/8/2009179
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 📋Chrome12/11/2008 Safari6/8/2009179
html.global_attributes.class 📋Chrome12/11/2008 Safari6/8/2009179
html.global_attributes.contenteditable 📋Chrome12/11/2008 Safari6/8/2009179
html.global_attributes.dir 📋Chrome12/11/2008 Safari6/8/2009179
html.global_attributes.lang 📋Chrome12/11/2008 Safari6/8/2009179
html.global_attributes.title 📋Chrome12/11/2008 Safari6/8/2009179

2008/12

API First Browser Date Last Browser Date Days Notes
html.elements.a 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.coords 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.hreflang 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.name 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.rel 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.rev 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.shape 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.a.type 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.acronym 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.address 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.alt 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.coords 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.href 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.nohref 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.shape 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.area.target 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.b 📋Safari6/23/2003 Chrome12/11/20081998
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.base 📋Safari10/26/2007 Chrome12/11/2008412
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 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.base.href.relative_url Safari10/26/2007 Chrome12/11/2008412
html.elements.base.target 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.body 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.br 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.button 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.canvas 📋Safari4/29/2005 Chrome12/11/20081322
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 📋Safari4/29/2005 Chrome12/11/20081322
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 📋Safari4/29/2005 Chrome12/11/20081322
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.col.align 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.col.valign 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.colgroup.align 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.colgroup.valign 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.del.cite Safari10/26/2007 Chrome12/11/2008412
html.elements.del.datetime Safari10/26/2007 Chrome12/11/2008412
html.elements.div 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.div.align Safari10/26/2007 Chrome12/11/2008412
html.elements.fieldset.form 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.accept-charset 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.action 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.enctype 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.method 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.name 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.form.target 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.frame 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.frameborder Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.marginheight Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.marginwidth Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.name Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.noresize Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.scrolling Safari10/26/2007 Chrome12/11/2008412
html.elements.frame.src Safari10/26/2007 Chrome12/11/2008412
html.elements.frameset 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.frameset.cols Safari10/26/2007 Chrome12/11/2008412
html.elements.frameset.rows Safari10/26/2007 Chrome12/11/2008412
html.elements.h1 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.h2 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.h3 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.h4 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.h5 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.h6 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.head 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.hr 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.html 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.html.version 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.html.xmlns Safari6/23/2003 Chrome12/11/20081998
html.elements.i 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.iframe.align 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.frameborder 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.height 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.longdesc 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.marginheight 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.marginwidth 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.name 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.scrolling 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.iframe.width 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.img.align 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.alt 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.border 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.height 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.hspace 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.ismap 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.longdesc 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.name 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.src 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.img.usemap 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.vspace 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.img.width 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.input 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.alt 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.checked 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.disabled 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.form 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.maxlength 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.name 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.readonly 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.size 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.src 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_button 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_checkbox 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_file 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_image 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_password 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_radio 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_reset 📋Safari6/23/2003 Chrome12/11/20081998
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_submit 📋Safari6/23/2003 Chrome12/11/20081998
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_text 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.type_url 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.input.usemap 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.ins.cite Safari10/26/2007 Chrome12/11/2008412
html.elements.ins.datetime Safari10/26/2007 Chrome12/11/2008412
html.elements.legend 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.li 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.link.rel 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.map 📋Safari6/23/2003 Chrome12/11/20081998
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 Safari6/23/2003 Chrome12/11/20081998
html.elements.marquee 📋Safari2/2/2004 Chrome12/11/20081774
Firefox: Implements the HTMLDivElement interface.Firefox for Android: Implements the HTMLDivElement interface.
html.elements.marquee.behavior Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.bgcolor Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.direction Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.height Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.hspace Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.loop Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.scrollamount Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.scrolldelay Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.truespeed Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.vspace Safari2/2/2004 Chrome12/11/20081774
html.elements.marquee.width Safari2/2/2004 Chrome12/11/20081774
html.elements.menu 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.meta 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.meta.charset 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.meta.http-equiv.refresh 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.noframes 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.noscript 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.archive 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.border 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.classid 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.codetype 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.data 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.declare 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.form 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.height 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.name 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.standby 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.type 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.usemap 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.object.width 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.ol.compact Safari10/26/2007 Chrome12/11/2008412
html.elements.p 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.pre.width Safari10/26/2007 Chrome12/11/2008412
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 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.q.cite 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.script 📋Safari10/26/2007 Chrome12/11/2008412
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.defer 📋Safari10/26/2007 Chrome12/11/2008412
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.select 📋Safari6/23/2003 Chrome12/11/20081998
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 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.select.form 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.select.multiple 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.select.name 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.select.size 📋Safari10/26/2007 Chrome12/11/2008412
html.elements.span 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.style 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.style.media 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.style.type 📋Safari6/23/2003 Chrome12/11/20081998
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.table 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.table.align Safari6/23/2003 Chrome12/11/20081998
html.elements.table.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.table.border Safari6/23/2003 Chrome12/11/20081998
html.elements.table.cellpadding Safari6/23/2003 Chrome12/11/20081998
html.elements.table.cellspacing Safari6/23/2003 Chrome12/11/20081998
html.elements.table.frame Safari6/23/2003 Chrome12/11/20081998
html.elements.table.rules Safari6/23/2003 Chrome12/11/20081998
html.elements.table.summary Safari6/23/2003 Chrome12/11/20081998
html.elements.table.width Safari6/23/2003 Chrome12/11/20081998
html.elements.tbody 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.tbody.align Safari10/26/2007 Chrome12/11/2008412
html.elements.tbody.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.tbody.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.td 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.td.abbr Safari6/23/2003 Chrome12/11/20081998
html.elements.td.align Safari10/26/2007 Chrome12/11/2008412
html.elements.td.axis Safari6/23/2003 Chrome12/11/20081998
html.elements.td.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.td.colspan Safari6/23/2003 Chrome12/11/20081998
html.elements.td.headers Safari6/23/2003 Chrome12/11/20081998
html.elements.td.rowspan Safari6/23/2003 Chrome12/11/20081998
html.elements.td.scope Safari6/23/2003 Chrome12/11/20081998
html.elements.td.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.td.width Safari6/23/2003 Chrome12/11/20081998
html.elements.tfoot 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.tfoot.align Safari10/26/2007 Chrome12/11/2008412
html.elements.tfoot.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.tfoot.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.th 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.th.abbr Safari6/23/2003 Chrome12/11/20081998
html.elements.th.align Safari10/26/2007 Chrome12/11/2008412
html.elements.th.axis Safari6/23/2003 Chrome12/11/20081998
html.elements.th.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.th.colspan Safari6/23/2003 Chrome12/11/20081998
html.elements.th.headers Safari6/23/2003 Chrome12/11/20081998
html.elements.th.rowspan Safari6/23/2003 Chrome12/11/20081998
html.elements.th.scope Safari6/23/2003 Chrome12/11/20081998
html.elements.th.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.th.width Safari6/23/2003 Chrome12/11/20081998
html.elements.thead 📋Safari6/23/2003 Chrome12/11/20081998
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 Safari10/26/2007 Chrome12/11/2008412
html.elements.thead.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.thead.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.title 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.tr 📋Safari6/23/2003 Chrome12/11/20081998
html.elements.tr.align Safari10/26/2007 Chrome12/11/2008412
html.elements.tr.bgcolor Safari6/23/2003 Chrome12/11/20081998
html.elements.tr.valign Safari10/26/2007 Chrome12/11/2008412
html.elements.u 📋Safari6/23/2003 Chrome12/11/20081998
Firefox: Before Firefox 4, this element implemented the HTMLSpanElement interface instead of the standard HTMLElement interface.
html.elements.ul.compact 📋Safari10/26/2007 Chrome12/11/2008412
html.global_attributes.id 📋Safari6/23/2003 Chrome12/11/20081998
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.style 📋Safari6/23/2003 Chrome12/11/20081998
html.global_attributes.tabindex 📋Safari3/18/2008 Chrome12/11/2008268