Not yet stable

For a given set of browsers, what APIs are not yet in all of them.

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs are in Browser X but not in Browser Y.
Not in FirefoxNot in Chrome Android
In Firefox 135
In Chrome Android 710

Unstable APIs

Below is a list of features that are not in all of Firefox and Chrome Android

Raw Data

Quick Links:

CSS Data

API First Browser Date Days in Limbo Notes
css.at-rules.container.anchor_position_queries 📋Chrome Android12/2/2025230
css.at-rules.container.anchor_position_queries.fallback 📋Chrome Android12/2/2025230
css.at-rules.container.anchor_position_queries.fallback.any_value 📋Chrome Android12/2/2025230
css.at-rules.container.scroll-state_queries 📋Chrome Android2/4/2025531
css.at-rules.container.scroll-state_queries.scrollable 📋Chrome Android2/4/2025531
css.at-rules.container.scroll-state_queries.scrolled 📋Chrome Android1/13/2026188
css.at-rules.container.scroll-state_queries.snapped 📋Chrome Android2/4/2025531
css.at-rules.container.scroll-state_queries.stuck 📋Chrome Android2/4/2025531
css.at-rules.container.style_queries_for_custom_properties 📋Chrome Android3/7/20231231
Safari: The document element cannot be a container. See bug 271040.Safari on iOS: The document element cannot be a container. See bug 271040.WebView on iOS: The document element cannot be a container. See bug 271040.
css.at-rules.container.style_queries_for_custom_properties.range_syntax 📋Chrome Android10/28/2025265
css.at-rules.custom-media 📋Firefox2/24/2026146
css.at-rules.document Firefox6/26/20182946
Firefox: Only supports an empty url-prefix() value, which is supported due to its use in Firefox browser detection. Still supported in user stylesheets.Firefox for Android: Only supports an empty url-prefix() value, which is supported due to its use in Firefox for Android browser detection. Still supported in user stylesheets.
css.at-rules.font-face.OpenType_CBDT_CBLC Chrome Android4/17/20183016
css.at-rules.font-face.OpenType_SBIX Chrome Android4/17/20183016
css.at-rules.font-face.OpenType_SVG Firefox7/22/20144381
css.at-rules.function 📋Chrome Android8/5/2025349
css.at-rules.function.result 📋Chrome Android8/5/2025349
css.at-rules.keyframes.named_range_keyframes 📋Chrome Android7/21/20231095
css.at-rules.media.-moz-device-pixel-ratio Firefox3/22/20115599
css.at-rules.media.color-index 📋Chrome Android8/21/20134716
css.at-rules.media.device-posture 📋Chrome Android1/14/2025552
css.at-rules.media.display-mode.fullscreen 📋Firefox6/7/20163695
Firefox: In Firefox's "Full Screen" user interface, browser tabs and other user interface appear but display-mode: fullscreen is true.Safari: In a Safari browser window, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).Safari on iOS: In the Safari app, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).Safari on iOS: In an installed web application with the display manifest member set to standalone, display-mode: fullscreen is true, even though the system status bar is visible. See bug 264218.WebView on iOS: In the Safari app, display-mode: fullscreen is never true, even when using the Fullscreen API. See mdn/browser-compat-data#18807 (comment).WebView on iOS: In an installed web application with the display manifest member set to standalone, display-mode: fullscreen is true, even though the system status bar is visible. See bug 264218.
css.at-rules.media.horizontal-viewport-segments 📋Chrome Android6/24/2025391
css.at-rules.media.inverted-colors 📋Firefox6/6/20231140
css.at-rules.media.prefers-reduced-data 📋Chrome Android8/25/20202155
css.at-rules.media.vertical-viewport-segments 📋Chrome Android6/24/2025391
css.at-rules.page.bottom-center 📋Chrome Android11/12/2024615
css.at-rules.page.bottom-left 📋Chrome Android11/12/2024615
css.at-rules.page.bottom-left-corner 📋Chrome Android11/12/2024615
css.at-rules.page.bottom-right 📋Chrome Android11/12/2024615
css.at-rules.page.bottom-right-corner 📋Chrome Android11/12/2024615
css.at-rules.page.left-bottom 📋Chrome Android11/12/2024615
css.at-rules.page.left-middle 📋Chrome Android11/12/2024615
css.at-rules.page.left-top 📋Chrome Android11/12/2024615
css.at-rules.page.right-bottom 📋Chrome Android11/12/2024615
css.at-rules.page.right-middle 📋Chrome Android11/12/2024615
css.at-rules.page.right-top 📋Chrome Android11/12/2024615
css.at-rules.page.top-center 📋Chrome Android11/12/2024615
css.at-rules.page.top-left 📋Chrome Android11/12/2024615
css.at-rules.page.top-left-corner 📋Chrome Android11/12/2024615
css.at-rules.page.top-right 📋Chrome Android11/12/2024615
css.at-rules.page.top-right-corner 📋Chrome Android11/12/2024615
css.at-rules.view-transition 📋Chrome Android6/11/2024769
css.properties.-moz-float-edge Firefox11/9/20047923
css.properties.-moz-force-broken-image-icon Firefox11/9/20047923
css.properties.-moz-orient Firefox8/16/20115452
css.properties.-moz-orient.block Firefox8/11/20153996
css.properties.-moz-orient.inline Firefox8/11/20153996
css.properties.-webkit-app-region Chrome Android2/27/20134891
css.properties.-webkit-border-before Chrome Android6/27/20125136
css.properties.-webkit-border-horizontal-spacing Chrome Android6/27/20125136
css.properties.-webkit-border-vertical-spacing Chrome Android6/27/20125136
css.properties.-webkit-box-reflect Chrome Android6/27/20125136
css.properties.-webkit-column-break-after Chrome Android6/27/20125136
css.properties.-webkit-column-break-before Chrome Android6/27/20125136
css.properties.-webkit-column-break-inside Chrome Android6/27/20125136
css.properties.-webkit-locale Chrome Android6/27/20125136
css.properties.-webkit-logical-height Chrome Android6/27/20125136
css.properties.-webkit-logical-width Chrome Android6/27/20125136
css.properties.-webkit-margin-after Chrome Android6/27/20125136
css.properties.-webkit-margin-before Chrome Android6/27/20125136
css.properties.-webkit-mask-box-image Chrome Android6/27/20125136
css.properties.-webkit-mask-composite Chrome Android6/27/20125136
css.properties.-webkit-max-logical-height Chrome Android6/27/20125136
css.properties.-webkit-max-logical-width Chrome Android6/27/20125136
css.properties.-webkit-min-logical-height Chrome Android6/27/20125136
css.properties.-webkit-min-logical-width Chrome Android6/27/20125136
css.properties.-webkit-perspective-origin-x Chrome Android6/27/20125136
css.properties.-webkit-perspective-origin-y Chrome Android6/27/20125136
css.properties.-webkit-rtl-ordering Chrome Android6/27/20125136
css.properties.-webkit-tap-highlight-color Chrome Android6/27/20125136
css.properties.-webkit-text-combine Chrome Android6/27/20125136
css.properties.-webkit-text-decorations-in-effect Chrome Android6/27/20125136
css.properties.-webkit-transform-origin-x Chrome Android6/27/20125136
css.properties.-webkit-transform-origin-y Chrome Android6/27/20125136
css.properties.-webkit-transform-origin-z Chrome Android6/27/20125136
css.properties.-webkit-user-drag Chrome Android6/27/20125136
css.properties.align-content.flex_context.last_baseline Firefox3/7/20173422
Safari: This value is recognized, but has no effect. See bug 235005.Safari on iOS: This value is recognized, but has no effect. See bug 235005.WebView on iOS: This value is recognized, but has no effect. See bug 235005.
css.properties.align-content.multicol_context 📋Chrome Android3/19/2024853
css.properties.alignment-baseline 📋Chrome Android6/27/20125136
css.properties.alignment-baseline.alphabetic Chrome Android6/27/20125136
css.properties.alignment-baseline.baseline Chrome Android6/27/20125136
css.properties.alignment-baseline.central Chrome Android6/27/20125136
css.properties.alignment-baseline.ideographic Chrome Android6/27/20125136
css.properties.alignment-baseline.mathematical Chrome Android6/27/20125136
css.properties.alignment-baseline.middle Chrome Android6/27/20125136
css.properties.alignment-baseline.text-after-edge Chrome Android6/27/20125136
css.properties.alignment-baseline.text-before-edge Chrome Android6/27/20125136
css.properties.animation.animation-timeline_included Chrome Android7/21/20231095
Chrome: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.Chrome Android: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.Edge: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.Opera: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.Opera Android: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.Samsung Internet: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.WebView Android: Support is currently reset-only. Including animation resets a previously-declared animation-timeline value to auto, but animation-timeline cannot be set via animation.
css.properties.animation-duration.auto 📋Chrome Android7/21/20231095
Firefox: Firefox does not currently support the auto value and only accepts values in seconds or milliseconds. It's recommended that 1ms is used until auto is supported.Firefox for Android: Firefox for Android does not currently support the auto value and only accepts values in seconds or milliseconds. It's recommended that 1ms is used until auto is supported.
css.properties.animation-range 📋Chrome Android7/21/20231095
css.properties.animation-range.normal 📋Chrome Android7/21/20231095
css.properties.animation-range-end 📋Chrome Android7/21/20231095
css.properties.animation-range-end.normal 📋Chrome Android7/21/20231095
css.properties.animation-range-start 📋Chrome Android7/21/20231095
css.properties.animation-range-start.normal 📋Chrome Android7/21/20231095
css.properties.animation-timeline.auto 📋Chrome Android7/21/20231095
css.properties.animation-timeline.none 📋Chrome Android7/21/20231095
css.properties.animation-trigger 📋Chrome Android3/10/2026132
css.properties.animation-trigger.none 📋Chrome Android3/10/2026132
css.properties.appearance.base-select 📋Chrome Android4/1/2025475
css.properties.background-image.element 📋Firefox3/22/20115599
css.properties.baseline-shift 📋Chrome Android6/27/20125136
css.properties.baseline-shift.baseline 📋Chrome Android6/27/20125136
css.properties.baseline-shift.sub 📋Chrome Android6/27/20125136
css.properties.baseline-shift.super 📋Chrome Android6/27/20125136
css.properties.block-size.fit-content_function Firefox8/10/20211805
css.properties.block-size.stretch 📋Chrome Android6/24/2025391
css.properties.break-after.always Firefox1/29/20192729
css.properties.break-after.avoid Chrome Android4/13/20163750
Firefox: The value is recognized, but has no effect. See bug 1972340.Firefox for Android: The value is recognized, but has no effect. See bug 1972340.Safari: The value is recognized, but has no effect. See bug 294559.Safari on iOS: The value is recognized, but has no effect. See bug 294559.WebView on iOS: The value is recognized, but has no effect. See bug 294559.
css.properties.break-after.avoid-column Chrome Android4/13/20163750
css.properties.break-after.avoid-page Chrome Android4/13/20163750
css.properties.break-after.column Chrome Android4/13/20163750
css.properties.break-after.multicol_context.always Firefox1/29/20192729
Firefox: Only supported in print mode. See bug 1675322.Firefox for Android: Only supported in print mode. See bug 1675322.
css.properties.break-after.multicol_context.avoid Chrome Android5/24/20221518
css.properties.break-after.multicol_context.avoid-column Chrome Android5/24/20221518
css.properties.break-after.multicol_context.column Chrome Android4/13/20163750
css.properties.break-after.paged_context.always Firefox1/29/20192729
css.properties.break-after.paged_context.avoid-page Chrome Android4/13/20163750
css.properties.break-after.recto Chrome Android4/13/20163750
css.properties.break-after.verso Chrome Android4/13/20163750
css.properties.break-before.always Firefox1/29/20192729
css.properties.break-before.avoid Chrome Android4/13/20163750
Firefox: The value is recognized, but has no effect. See bug 1972340.Firefox for Android: The value is recognized, but has no effect. See bug 1972340.Safari: The value is recognized, but has no effect. See bug 294559.Safari on iOS: The value is recognized, but has no effect. See bug 294559.WebView on iOS: The value is recognized, but has no effect. See bug 294559.
css.properties.break-before.avoid-column Chrome Android4/13/20163750
css.properties.break-before.avoid-page Chrome Android4/13/20163750
css.properties.break-before.column Chrome Android4/13/20163750
css.properties.break-before.multicol_context.always Firefox1/29/20192729
Firefox: Only supported in print mode. See bug 1675322.Firefox for Android: Only supported in print mode. See bug 1675322.
css.properties.break-before.multicol_context.avoid Chrome Android5/24/20221518
css.properties.break-before.multicol_context.avoid-column Chrome Android5/24/20221518
css.properties.break-before.multicol_context.column Chrome Android6/8/20163694
css.properties.break-before.paged_context.always Firefox1/29/20192729
css.properties.break-before.recto Chrome Android4/13/20163750
css.properties.break-before.verso Chrome Android4/13/20163750
css.properties.buffered-rendering Chrome Android7/10/20134758
css.properties.buffered-rendering.auto Chrome Android7/10/20134758
css.properties.buffered-rendering.dynamic Chrome Android7/10/20134758
css.properties.buffered-rendering.static Chrome Android7/10/20134758
css.properties.caption-side.writing-mode_relative_values Firefox11/3/20153912
css.properties.caret-animation 📋Chrome Android9/2/2025321
css.properties.caret-animation.auto 📋Chrome Android9/2/2025321
css.properties.caret-animation.manual 📋Chrome Android9/2/2025321
css.properties.caret-shape 📋Chrome Android1/13/2026188
css.properties.caret-shape.auto 📋Chrome Android1/13/2026188
css.properties.caret-shape.bar 📋Chrome Android1/13/2026188
css.properties.caret-shape.block 📋Chrome Android1/13/2026188
css.properties.caret-shape.underscore 📋Chrome Android1/13/2026188
css.properties.color-adjust 📋Firefox8/2/20163639
css.properties.color-adjust.economy 📋Firefox8/2/20163639
css.properties.color-adjust.exact 📋Firefox8/2/20163639
css.properties.color-interpolation.linearGradient Firefox2/20/2024881
css.properties.color-rendering Chrome Android6/27/20125136
css.properties.color-rendering.auto Chrome Android6/27/20125136
css.properties.color-rendering.optimizeQuality Chrome Android6/27/20125136
css.properties.color-rendering.optimizeSpeed Chrome Android6/27/20125136
css.properties.column-height 📋Chrome Android2/10/2026160
css.properties.column-height.auto 📋Chrome Android2/10/2026160
css.properties.column-wrap 📋Chrome Android2/10/2026160
css.properties.column-wrap.auto 📋Chrome Android2/10/2026160
css.properties.column-wrap.nowrap 📋Chrome Android2/10/2026160
css.properties.column-wrap.wrap 📋Chrome Android2/10/2026160
css.properties.columns.column-height 📋Chrome Android2/10/2026160
css.properties.container-type.anchored 📋Chrome Android12/2/2025230
css.properties.container-type.scroll-state 📋Chrome Android2/4/2025531
css.properties.content.alt_text.counters Chrome Android9/2/2025321
Chrome: Counters are recognised, but the spoken values do not incrementChrome Android: Counters are recognised, but the spoken values do not incrementEdge: Counters are recognised, but the spoken values do not incrementOpera: Counters are recognised, but the spoken values do not incrementOpera Android: Counters are recognised, but the spoken values do not incrementWebView Android: Counters are recognised, but the spoken values do not increment
css.properties.content.none_applies_to_elements Firefox8/10/20211805
css.properties.content-visibility.is_transitionable 📋Chrome Android9/12/20231042
css.properties.content-visibility.keyframe_animatable 📋Chrome Android8/15/20231070
css.properties.corner-block-end-shape 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-block-end-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-block-start-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-bottom-left-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-bottom-right-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-bottom-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-end-end-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-end-start-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-inline-end-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-inline-start-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-left-shape 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-left-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-right-shape 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-right-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-shape 📋Chrome Android8/5/2025349
css.properties.corner-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-start-end-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-start-start-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-top-left-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-top-right-shape.squircle 📋Chrome Android8/5/2025349
css.properties.corner-top-shape 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.bevel 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.notch 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.round 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.scoop 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.square 📋Chrome Android8/5/2025349
css.properties.corner-top-shape.squircle 📋Chrome Android8/5/2025349
css.properties.counter-reset.reset_does_not_affect_siblings Firefox10/20/20202099
css.properties.counter-reset.reversed 📋Firefox1/11/20221651
css.properties.display.is_transitionable 📋Chrome Android9/12/20231042
css.properties.display.keyframe_animatable 📋Chrome Android8/15/20231070
css.properties.display.math Chrome Android1/10/20231287
css.properties.display.ruby-base Firefox5/12/20154087
css.properties.display.ruby-base-container Firefox5/12/20154087
css.properties.display.ruby-text-container Firefox5/12/20154087
css.properties.dynamic-range-limit 📋Chrome Android4/29/2025447
css.properties.dynamic-range-limit.constrained 📋Chrome Android4/29/2025447
css.properties.dynamic-range-limit.dynamic-range-limit-mix_values 📋Chrome Android4/29/2025447
css.properties.dynamic-range-limit.no-limit 📋Chrome Android4/29/2025447
css.properties.dynamic-range-limit.standard 📋Chrome Android4/29/2025447
css.properties.field-sizing 📋Chrome Android3/19/2024853
css.properties.field-sizing.content 📋Chrome Android3/19/2024853
css.properties.field-sizing.fixed 📋Chrome Android3/19/2024853
css.properties.flex.stretch 📋Chrome Android6/24/2025391
css.properties.flex-basis.stretch 📋Chrome Android6/24/2025391
css.properties.font-palette.animation_computed Chrome Android1/23/2024909
css.properties.font-palette.palette-mix_function 📋Chrome Android1/23/2024909
css.properties.font-synthesis.position Firefox9/26/20231028
css.properties.font-synthesis-position 📋Firefox9/26/20231028
css.properties.font-synthesis-position.auto 📋Firefox9/26/20231028
css.properties.font-synthesis-position.none 📋Firefox9/26/20231028
css.properties.font-synthesis-style.oblique-only 📋Firefox4/1/2025475
css.properties.forced-color-adjust.preserve-parent-color 📋Chrome Android9/27/20221392
css.properties.grid-template-columns.masonry 📋Firefox6/2/20202239
css.properties.grid-template-rows.masonry 📋Firefox6/2/20202239
css.properties.height.fit-content_function 📋Firefox8/10/20211805
css.properties.hyphens.language_albanian Chrome Android4/4/20231203
css.properties.hyphens.language_amharic Chrome Android4/4/20231203
css.properties.hyphens.language_armenian Chrome Android11/17/20202071
css.properties.hyphens.language_assamese Chrome Android11/17/20202071
css.properties.hyphens.language_basque Chrome Android11/17/20202071
css.properties.hyphens.language_belarusian Chrome Android11/17/20202071
css.properties.hyphens.language_bengali Chrome Android11/17/20202071
css.properties.hyphens.language_bosnian Firefox11/8/20115368
css.properties.hyphens.language_catalan Firefox11/8/20115368
css.properties.hyphens.language_cyrillic_mongolian Chrome Android11/17/20202071
css.properties.hyphens.language_esperanto Firefox11/8/20115368
css.properties.hyphens.language_ethiopic_script_mul Chrome Android4/4/20231203
css.properties.hyphens.language_ethiopic_script_und Chrome Android11/17/20202071
css.properties.hyphens.language_finnish Firefox11/8/20115368
css.properties.hyphens.language_georgian Chrome Android4/4/20231203
css.properties.hyphens.language_gujarati Chrome Android11/17/20202071
css.properties.hyphens.language_hindi Chrome Android11/17/20202071
css.properties.hyphens.language_icelandic Firefox11/8/20115368
css.properties.hyphens.language_interlingua Firefox11/8/20115368
css.properties.hyphens.language_irish Chrome Android11/17/20202071
css.properties.hyphens.language_kannada Chrome Android11/17/20202071
css.properties.hyphens.language_kurmanji Firefox11/8/20115368
css.properties.hyphens.language_latvian Chrome Android4/4/20231203
css.properties.hyphens.language_malayalam Chrome Android11/17/20202071
css.properties.hyphens.language_marathi Chrome Android11/17/20202071
css.properties.hyphens.language_modern_greek Chrome Android4/4/20231203
css.properties.hyphens.language_mongolian Firefox11/8/20115368
css.properties.hyphens.language_old_slavonic Chrome Android11/17/20202071
css.properties.hyphens.language_oriya Chrome Android11/17/20202071
css.properties.hyphens.language_polish Firefox7/22/20144381
css.properties.hyphens.language_punjabi Chrome Android11/17/20202071
css.properties.hyphens.language_tamil Chrome Android11/17/20202071
css.properties.hyphens.language_telugu Chrome Android11/17/20202071
css.properties.hyphens.language_turkish Firefox12/20/20115326
css.properties.hyphens.language_turkmen Chrome Android11/17/20202071
css.properties.hyphens.language_upper_sorbian Firefox11/8/20115368
css.properties.image-rendering.optimizeQuality Firefox1/21/20106024
css.properties.image-rendering.optimizeSpeed Firefox1/21/20106024
css.properties.image-rendering.smooth 📋Firefox10/5/20211749
css.properties.ime-mode 📋Firefox6/17/20086607
css.properties.initial-letter 📋Chrome Android2/7/20231259
Safari: See bug 229090 for the unprefixed property.Safari on iOS: See bug 229090 for the unprefixed property.Safari on iOS: Does not support decimal values. See bug 296785.WebView on iOS: See bug 229090 for the unprefixed property.WebView on iOS: Does not support decimal values. See bug 296785.
css.properties.initial-letter.normal 📋Chrome Android2/7/20231259
css.properties.inline-size.fit-content_function Firefox8/10/20211805
css.properties.inline-size.stretch 📋Chrome Android6/24/2025391
css.properties.interactivity 📋Chrome Android4/1/2025475
css.properties.interactivity.auto 📋Chrome Android4/1/2025475
css.properties.interactivity.inert 📋Chrome Android4/1/2025475
css.properties.interest-delay 📋Chrome Android10/28/2025265
css.properties.interest-delay.normal 📋Chrome Android10/28/2025265
css.properties.interest-delay-end 📋Chrome Android10/28/2025265
css.properties.interest-delay-end.normal 📋Chrome Android10/28/2025265
css.properties.interest-delay-start 📋Chrome Android10/28/2025265
css.properties.interest-delay-start.normal 📋Chrome Android10/28/2025265
css.properties.interpolate-size 📋Chrome Android9/17/2024671
css.properties.interpolate-size.allow-keywords 📋Chrome Android9/17/2024671
css.properties.interpolate-size.numeric-only 📋Chrome Android9/17/2024671
css.properties.justify-items.block_context 📋Chrome Android10/15/2024643
css.properties.justify-self.block_context 📋Chrome Android10/15/2024643
css.properties.line-clamp.none Firefox7/9/20192568
css.properties.list-style.symbols 📋Firefox1/13/20154206
css.properties.list-style-type.afar Chrome Android5/25/20211882
css.properties.list-style-type.amharic Chrome Android5/25/20211882
css.properties.list-style-type.amharic-abegede Chrome Android5/25/20211882
css.properties.list-style-type.asterisks Chrome Android5/25/20211882
css.properties.list-style-type.binary Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-abegede Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-abegede-am-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-abegede-gez Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-abegede-ti-er Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-abegede-ti-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-aa-er Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-aa-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-am-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-gez Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-om-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-sid-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-so-et Chrome Android5/25/20211882
css.properties.list-style-type.ethiopic-halehame-tig Chrome Android5/25/20211882
css.properties.list-style-type.footnotes Chrome Android5/25/20211882
css.properties.list-style-type.lower-hexadecimal Chrome Android5/25/20211882
css.properties.list-style-type.lower-norwegian Chrome Android5/25/20211882
css.properties.list-style-type.octal Chrome Android5/25/20211882
css.properties.list-style-type.oromo Chrome Android5/25/20211882
css.properties.list-style-type.sidama Chrome Android5/25/20211882
css.properties.list-style-type.somali Chrome Android5/25/20211882
css.properties.list-style-type.symbols 📋Firefox1/13/20154206
css.properties.list-style-type.tigre Chrome Android5/25/20211882
css.properties.list-style-type.tigrinya-er Chrome Android5/25/20211882
css.properties.list-style-type.tigrinya-er-abegede Chrome Android5/25/20211882
css.properties.list-style-type.tigrinya-et Chrome Android5/25/20211882
css.properties.list-style-type.tigrinya-et-abegede Chrome Android5/25/20211882
css.properties.list-style-type.upper-greek Chrome Android5/25/20211882
css.properties.list-style-type.upper-hexadecimal Chrome Android5/25/20211882
css.properties.list-style-type.upper-norwegian Chrome Android5/25/20211882
css.properties.mask-border 📋Chrome Android6/27/20125136
css.properties.mask-border-outset 📋Chrome Android6/27/20125136
css.properties.mask-border-repeat 📋Chrome Android6/27/20125136
css.properties.mask-border-slice 📋Chrome Android6/27/20125136
css.properties.mask-border-source 📋Chrome Android6/27/20125136
css.properties.mask-border-width 📋Chrome Android6/27/20125136
css.properties.mask-clip.border Chrome Android6/27/20125136
Chrome: Only works when using -webkit-mask-clip.Chrome Android: Only works when using -webkit-mask-clip.Edge: Only works when using -webkit-mask-clip.Quest Browser: Only works when using -webkit-mask-clip.Opera: Only works when using -webkit-mask-clip.Opera Android: Only works when using -webkit-mask-clip.Samsung Internet: Only works when using -webkit-mask-clip.
css.properties.mask-clip.content Chrome Android6/27/20125136
Chrome: Only works when using -webkit-mask-clip.Chrome Android: Only works when using -webkit-mask-clip.Edge: Only works when using -webkit-mask-clip.Quest Browser: Only works when using -webkit-mask-clip.Opera: Only works when using -webkit-mask-clip.Opera Android: Only works when using -webkit-mask-clip.Samsung Internet: Only works when using -webkit-mask-clip.
css.properties.mask-clip.padding Chrome Android6/27/20125136
Chrome: Only works when using -webkit-mask-clip.Chrome Android: Only works when using -webkit-mask-clip.Edge: Only works when using -webkit-mask-clip.Quest Browser: Only works when using -webkit-mask-clip.Opera: Only works when using -webkit-mask-clip.Opera Android: Only works when using -webkit-mask-clip.Samsung Internet: Only works when using -webkit-mask-clip.
css.properties.mask-clip.text Chrome Android6/27/20125136
Chrome: Only works when using -webkit-mask-clip.Chrome Android: Only works when using -webkit-mask-clip.Edge: Only works when using -webkit-mask-clip.Quest Browser: Only works when using -webkit-mask-clip.Opera: Only works when using -webkit-mask-clip.Opera Android: Only works when using -webkit-mask-clip.Samsung Internet: Only works when using -webkit-mask-clip.
css.properties.mask-origin.border Chrome Android6/27/20125136
css.properties.mask-origin.content Chrome Android6/27/20125136
css.properties.mask-origin.padding Chrome Android6/27/20125136
css.properties.max-block-size.fit-content_function Firefox8/10/20211805
css.properties.max-block-size.stretch 📋Chrome Android6/24/2025391
css.properties.max-height.fit-content_function 📋Firefox8/10/20211805
css.properties.max-height.stretch 📋Chrome Android6/24/2025391
css.properties.max-inline-size.fit-content_function Firefox8/10/20211805
css.properties.max-inline-size.stretch 📋Chrome Android6/24/2025391
css.properties.max-width.fit-content_function 📋Firefox8/10/20211805
css.properties.max-width.stretch 📋Chrome Android6/24/2025391
css.properties.min-block-size.fit-content_function Firefox8/10/20211805
css.properties.min-block-size.stretch 📋Chrome Android6/24/2025391
css.properties.min-height.fit-content_function 📋Firefox8/10/20211805
css.properties.min-height.stretch Chrome Android6/24/2025391
css.properties.min-inline-size.fit-content_function Firefox8/10/20211805
css.properties.min-inline-size.stretch 📋Chrome Android6/24/2025391
css.properties.min-width.fit-content_function 📋Firefox8/10/20211805
css.properties.min-width.stretch Chrome Android6/24/2025391
css.properties.mix-blend-mode.svg_elements Firefox9/2/20144339
css.properties.object-view-box 📋Chrome Android8/2/20221448
css.properties.object-view-box.none 📋Chrome Android8/2/20221448
css.properties.orphans 📋Chrome Android2/27/20134891
css.properties.overlay 📋Chrome Android9/12/20231042
css.properties.overlay.auto 📋Chrome Android9/12/20231042
css.properties.overlay.none 📋Chrome Android9/12/20231042
css.properties.page-break-after.avoid 📋Chrome Android6/27/20125136
css.properties.page-break-before.avoid 📋Chrome Android6/27/20125136
css.properties.pointer-events.bounding-box 📋Chrome Android2/26/20144527
css.properties.position-visibility.anchors-valid 📋Firefox1/13/2026188
css.properties.reading-flow 📋Chrome Android5/27/2025419
css.properties.reading-flow.flex-flow 📋Chrome Android5/27/2025419
css.properties.reading-flow.flex-visual 📋Chrome Android5/27/2025419
css.properties.reading-flow.grid-columns 📋Chrome Android5/27/2025419
css.properties.reading-flow.grid-order 📋Chrome Android5/27/2025419
css.properties.reading-flow.grid-rows 📋Chrome Android5/27/2025419
css.properties.reading-flow.normal 📋Chrome Android5/27/2025419
css.properties.reading-flow.source-order 📋Chrome Android5/27/2025419
css.properties.reading-order 📋Chrome Android5/27/2025419
css.properties.ruby-position.alternate Firefox4/19/20211918
css.properties.ruby-position.inter-character Chrome Android7/27/20202184
Chrome: This value is only supported with the prefixed version of the property.Chrome Android: This value is only supported with the prefixed version of the property.Edge: This value is only supported with the prefixed version of the property.Quest Browser: This value is only supported with the prefixed version of the property.Opera: This value is only supported with the prefixed version of the property.Opera Android: This value is only supported with the prefixed version of the property.Samsung Internet: This value is only supported with the prefixed version of the property.WebView Android: This value is only supported with the prefixed version of the property.
css.properties.scroll-initial-target 📋Chrome Android2/4/2025531
css.properties.scroll-initial-target.nearest 📋Chrome Android2/4/2025531
css.properties.scroll-initial-target.none 📋Chrome Android2/4/2025531
css.properties.scroll-marker-group 📋Chrome Android4/1/2025475
css.properties.scroll-marker-group.after 📋Chrome Android4/1/2025475
css.properties.scroll-marker-group.before 📋Chrome Android4/1/2025475
css.properties.scroll-marker-group.none 📋Chrome Android4/1/2025475
css.properties.scroll-target-group 📋Chrome Android9/2/2025321
css.properties.scroll-target-group.auto 📋Chrome Android9/2/2025321
css.properties.scroll-target-group.none 📋Chrome Android9/2/2025321
css.properties.scroll-timeline.none 📋Chrome Android7/21/20231095
css.properties.scroll-timeline-axis.block 📋Chrome Android7/21/20231095
css.properties.scroll-timeline-axis.inline 📋Chrome Android7/21/20231095
css.properties.scroll-timeline-axis.x 📋Chrome Android7/21/20231095
css.properties.scroll-timeline-axis.y 📋Chrome Android7/21/20231095
css.properties.scroll-timeline-name.none 📋Chrome Android7/21/20231095
css.properties.speak 📋Chrome Android2/4/20202358
Chrome: The implementation is not compliant with the specification, see bug 40813740.Chrome Android: The implementation is not compliant with the specification, see bug 40813740.Edge: The implementation is not compliant with the specification, see bug 40813740.Quest Browser: The implementation is not compliant with the specification, see bug 40813740.Opera: The implementation is not compliant with the specification, see bug 40813740.Opera Android: The implementation is not compliant with the specification, see bug 40813740.Samsung Internet: The implementation is not compliant with the specification, see bug 40813740.WebView Android: The implementation is not compliant with the specification, see bug 40813740.
css.properties.text-autospace.auto 📋Firefox11/11/2025251
css.properties.text-autospace.ideograph-alpha 📋Firefox11/11/2025251
css.properties.text-autospace.ideograph-numeric 📋Firefox11/11/2025251
css.properties.text-autospace.insert 📋Firefox11/11/2025251
css.properties.text-box 📋Chrome Android2/4/2025531
css.properties.text-box.auto 📋Chrome Android2/4/2025531
css.properties.text-box.none 📋Chrome Android2/4/2025531
css.properties.text-box.normal 📋Chrome Android2/4/2025531
css.properties.text-box.text 📋Chrome Android2/4/2025531
css.properties.text-box.trim-both 📋Chrome Android2/4/2025531
css.properties.text-box.trim-end 📋Chrome Android2/4/2025531
css.properties.text-box.trim-start 📋Chrome Android2/4/2025531
css.properties.text-box-edge 📋Chrome Android2/4/2025531
css.properties.text-box-edge.auto 📋Chrome Android2/4/2025531
css.properties.text-box-edge.text 📋Chrome Android2/4/2025531
css.properties.text-box-trim 📋Chrome Android2/4/2025531
css.properties.text-box-trim.none 📋Chrome Android2/4/2025531
css.properties.text-box-trim.trim-both 📋Chrome Android2/4/2025531
css.properties.text-box-trim.trim-end 📋Chrome Android2/4/2025531
css.properties.text-box-trim.trim-start 📋Chrome Android2/4/2025531
css.properties.text-decoration-inset 📋Firefox12/9/2025223
css.properties.text-decoration-inset.auto 📋Firefox12/9/2025223
css.properties.text-decoration-skip-ink.all 📋Firefox4/7/20202295
css.properties.text-emphasis-position.auto Firefox10/29/2024629
css.properties.text-overflow.string Firefox12/20/20115326
css.properties.text-overflow.two_value_syntax Firefox12/20/20115326
css.properties.text-size-adjust 📋Chrome Android10/19/20163561
css.properties.text-size-adjust.auto 📋Chrome Android10/19/20163561
css.properties.text-size-adjust.none 📋Chrome Android10/19/20163561
css.properties.text-size-adjust.percentages 📋Chrome Android10/19/20163561
css.properties.text-spacing-trim 📋Chrome Android3/19/2024853
css.properties.text-spacing-trim.normal 📋Chrome Android3/19/2024853
css.properties.text-spacing-trim.space-all 📋Chrome Android3/19/2024853
css.properties.text-spacing-trim.space-first 📋Chrome Android3/19/2024853
css.properties.text-spacing-trim.trim-start 📋Chrome Android3/19/2024853
css.properties.text-transform.dutch_ij_digraph Firefox7/17/20125116
css.properties.text-transform.full-size-kana 📋Firefox12/11/20182778
css.properties.text-transform.full-width 📋Firefox2/19/20134899
css.properties.text-wrap.pretty 📋Chrome Android9/12/20231042
css.properties.text-wrap-style.pretty 📋Chrome Android10/15/2024643
css.properties.timeline-scope 📋Chrome Android8/15/20231070
css.properties.timeline-scope.none 📋Chrome Android8/15/20231070
css.properties.timeline-trigger 📋Chrome Android3/10/2026132
css.properties.timeline-trigger.auto 📋Chrome Android3/10/2026132
css.properties.timeline-trigger.none 📋Chrome Android3/10/2026132
css.properties.timeline-trigger.normal 📋Chrome Android3/10/2026132
css.properties.timeline-trigger-name 📋Chrome Android3/10/2026132
css.properties.timeline-trigger-name.none 📋Chrome Android3/10/2026132
css.properties.timeline-trigger-source 📋Chrome Android3/10/2026132
css.properties.timeline-trigger-source.auto 📋Chrome Android3/10/2026132
css.properties.timeline-trigger-source.none 📋Chrome Android3/10/2026132
css.properties.touch-action.pan-down Chrome Android12/6/20163513
css.properties.touch-action.pan-left Chrome Android12/6/20163513
css.properties.touch-action.pan-right Chrome Android12/6/20163513
css.properties.touch-action.pan-up Chrome Android12/6/20163513
css.properties.transition-behavior.transitionable_content-visibility 📋Chrome Android9/12/20231042
css.properties.transition-behavior.transitionable_display 📋Chrome Android9/12/20231042
css.properties.trigger-scope 📋Chrome Android3/10/2026132
css.properties.trigger-scope.all 📋Chrome Android3/10/2026132
css.properties.trigger-scope.none 📋Chrome Android3/10/2026132
css.properties.user-modify Chrome Android6/27/20125136
Firefox: While the CSS property is parsed and accepted, it does not have any effect.Firefox for Android: While the CSS property is parsed and accepted, it does not have any effect.
css.properties.user-modify.read-write-plaintext-only Chrome Android6/27/20125136
css.properties.view-timeline.none 📋Chrome Android7/21/20231095
css.properties.view-timeline-axis.block 📋Chrome Android7/21/20231095
css.properties.view-timeline-axis.inline 📋Chrome Android7/21/20231095
css.properties.view-timeline-axis.x 📋Chrome Android7/21/20231095
css.properties.view-timeline-axis.y 📋Chrome Android7/21/20231095
css.properties.view-timeline-inset 📋Chrome Android7/21/20231095
css.properties.view-timeline-inset.auto 📋Chrome Android7/21/20231095
css.properties.view-timeline-name.none 📋Chrome Android7/21/20231095
css.properties.view-transition-group 📋Chrome Android9/2/2025321
css.properties.view-transition-group.contain Chrome Android9/2/2025321
css.properties.view-transition-group.nearest Chrome Android9/2/2025321
css.properties.view-transition-group.normal Chrome Android9/2/2025321
css.properties.white-space.preserve-spaces 📋Firefox3/19/2024853
css.properties.white-space.svg_elements Firefox2/24/20154164
css.properties.white-space-collapse.preserve-spaces 📋Firefox3/19/2024853
css.properties.widows 📋Chrome Android2/27/20134891
css.properties.width.fit-content_function 📋Firefox8/10/20211805
css.properties.word-break.auto-phrase 📋Chrome Android10/31/2023993
Chrome: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.Chrome Android: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.Edge: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.Opera: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.Opera Android: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.Samsung Internet: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.WebView Android: This value is only applicable if lang="ja" is specified. This value has no effect on other locales.
css.selectors.-moz-color-swatch Firefox2/4/20144549
css.selectors.-moz-first-node Firefox8/8/20173268
css.selectors.-moz-last-node Firefox8/8/20173268
css.selectors.-moz-list-bullet Firefox11/9/20047923
css.selectors.-moz-list-number Firefox11/9/20047923
css.selectors.-moz-only-whitespace Firefox11/9/20047923
css.selectors.-moz-progress-bar Firefox8/16/20115452
css.selectors.-moz-range-progress Firefox6/25/20134773
css.selectors.-moz-range-thumb Firefox5/14/20134815
css.selectors.-moz-range-track Firefox5/14/20134815
css.selectors.-moz-submit-invalid Firefox4/19/20211918
Firefox: From Firefox 88 the feature has been placed behind a flag. See bug 1694129.Firefox for Android: From version 88, the feature has been withdrawn. See bug 1694129.
css.selectors.-moz-window-inactive Firefox3/22/20115599
css.selectors.-webkit-inner-spin-button Chrome Android6/27/20125136
css.selectors.-webkit-meter-bar Chrome Android6/27/20125136
css.selectors.-webkit-meter-even-less-good-value Chrome Android6/27/20125136
css.selectors.-webkit-meter-inner-element Chrome Android2/27/20134891
css.selectors.-webkit-meter-optimum-value Chrome Android6/27/20125136
css.selectors.-webkit-meter-suboptimum-value Chrome Android6/27/20125136
css.selectors.-webkit-progress-bar Chrome Android2/27/20134891
css.selectors.-webkit-progress-inner-element Chrome Android2/27/20134891
css.selectors.-webkit-progress-value Chrome Android2/27/20134891
css.selectors.-webkit-resizer Chrome Android6/27/20125136
css.selectors.-webkit-scrollbar Chrome Android6/27/20125136
Safari on iOS: From Safari 13, only display: none works with this pseudo-element. Other styles have no effect.WebView on iOS: From Safari 13, only display: none works with this pseudo-element. Other styles have no effect.
css.selectors.-webkit-scrollbar-button Chrome Android6/27/20125136
css.selectors.-webkit-scrollbar-corner Chrome Android6/27/20125136
css.selectors.-webkit-scrollbar-thumb Chrome Android6/27/20125136
css.selectors.-webkit-scrollbar-track Chrome Android6/27/20125136
css.selectors.-webkit-scrollbar-track-piece Chrome Android6/27/20125136
css.selectors.-webkit-search-cancel-button Chrome Android6/27/20125136
css.selectors.-webkit-search-results-button Chrome Android6/27/20125136
css.selectors.-webkit-slider-runnable-track Chrome Android4/3/20134856
css.selectors.-webkit-slider-thumb Chrome Android1/15/20144569
css.selectors.attribute.case_sensitive_modifier Firefox3/19/20192680
css.selectors.checkmark 📋Chrome Android2/4/2025531
css.selectors.column 📋Chrome Android4/1/2025475
css.selectors.column.nested_scroll-marker Chrome Android4/1/2025475
css.selectors.cue.selector_argument Chrome Android4/3/20134856
css.selectors.first-letter.dutch_ij_digraph Firefox3/23/20211945
css.selectors.first-letter.svg_text_element Firefox3/19/2024853
css.selectors.first-line.svg_text_element Firefox3/19/2024853
css.selectors.fullscreen.all_elements Firefox12/15/20153870
css.selectors.future 📋Chrome Android2/27/20134891
css.selectors.grammar-error 📋Chrome Android1/23/2024909
css.selectors.has-slotted 📋Firefox3/4/2025503
css.selectors.host-context 📋Chrome Android10/19/20163561
css.selectors.interest-source 📋Chrome Android10/28/2025265
css.selectors.interest-target 📋Chrome Android10/28/2025265
css.selectors.lang.argument_list Firefox6/6/20231140
css.selectors.lang.wildcards Firefox6/6/20231140
css.selectors.left 📋Chrome Android6/27/20125136
css.selectors.marker.counter_support 📋Firefox1/13/2026188
css.selectors.marker.quotes_support 📋Firefox1/13/2026188
css.selectors.past 📋Chrome Android2/27/20134891
css.selectors.picker 📋Chrome Android4/1/2025475
css.selectors.picker-icon 📋Chrome Android2/4/2025531
css.selectors.picture-in-picture 📋Chrome Android2/7/20231259
css.selectors.right 📋Chrome Android6/27/20125136
css.selectors.scroll-button 📋Chrome Android4/1/2025475
css.selectors.scroll-button.block-end 📋Chrome Android4/1/2025475
css.selectors.scroll-button.block-start 📋Chrome Android4/1/2025475
css.selectors.scroll-button.down 📋Chrome Android4/1/2025475
css.selectors.scroll-button.inline-end 📋Chrome Android4/1/2025475
css.selectors.scroll-button.inline-start 📋Chrome Android4/1/2025475
css.selectors.scroll-button.left 📋Chrome Android4/1/2025475
css.selectors.scroll-button.right 📋Chrome Android4/1/2025475
css.selectors.scroll-button.star 📋Chrome Android4/1/2025475
css.selectors.scroll-button.up 📋Chrome Android4/1/2025475
css.selectors.scroll-marker 📋Chrome Android4/1/2025475
css.selectors.scroll-marker-group 📋Chrome Android4/1/2025475
css.selectors.search-text 📋Chrome Android1/13/2026188
css.selectors.selection.text-decoration Chrome Android9/2/20221417
css.selectors.spelling-error 📋Chrome Android1/23/2024909
css.selectors.target-after 📋Chrome Android10/28/2025265
css.selectors.target-before 📋Chrome Android10/28/2025265
css.selectors.target-current 📋Chrome Android4/1/2025475
css.selectors.view-transition-group-children 📋Chrome Android9/2/2025321
css.selectors.xr-overlay 📋Chrome Android5/19/20202253
css.types.anchor-size.inset_margin Chrome Android1/14/2025552
css.types.attr.type_function 📋Chrome Android2/4/2025531
css.types.attr.type_function.angle 📋Chrome Android2/4/2025531
css.types.attr.type_function.color 📋Chrome Android2/4/2025531
css.types.attr.type_function.custom-ident 📋Chrome Android2/4/2025531
css.types.attr.type_function.ident 📋Chrome Android2/4/2025531
css.types.attr.type_function.image 📋Chrome Android2/4/2025531
css.types.attr.type_function.integer 📋Chrome Android2/4/2025531
css.types.attr.type_function.length 📋Chrome Android2/4/2025531
css.types.attr.type_function.length-percentage 📋Chrome Android2/4/2025531
css.types.attr.type_function.number 📋Chrome Android2/4/2025531
css.types.attr.type_function.percentage 📋Chrome Android2/4/2025531
css.types.attr.type_function.resolution 📋Chrome Android2/4/2025531
css.types.attr.type_function.string 📋Chrome Android2/4/2025531
css.types.attr.type_function.time 📋Chrome Android2/4/2025531
css.types.attr.type_function.transform-function 📋Chrome Android2/4/2025531
css.types.attr.type_function.url 📋Chrome Android2/4/2025531
css.types.calc.typed_division_produces_unitless_number 📋Chrome Android9/2/2025321
css.types.calc-size 📋Chrome Android9/17/2024671
css.types.color.contrast-color 📋Firefox12/9/2025223
css.types.corner-shape-value 📋Chrome Android8/5/2025349
css.types.corner-shape-value.bevel 📋Chrome Android8/5/2025349
css.types.corner-shape-value.notch 📋Chrome Android8/5/2025349
css.types.corner-shape-value.round 📋Chrome Android8/5/2025349
css.types.corner-shape-value.scoop 📋Chrome Android8/5/2025349
css.types.corner-shape-value.square 📋Chrome Android8/5/2025349
css.types.corner-shape-value.squircle 📋Chrome Android8/5/2025349
css.types.corner-shape-value.superellipse 📋Chrome Android8/5/2025349
css.types.dashed-function 📋Chrome Android8/5/2025349
css.types.dynamic-range-limit-mix 📋Chrome Android4/29/2025447
css.types.env.keyboard-inset-bottom 📋Chrome Android9/21/20211763
css.types.env.keyboard-inset-height 📋Chrome Android9/21/20211763
css.types.env.keyboard-inset-left 📋Chrome Android9/21/20211763
css.types.env.keyboard-inset-right 📋Chrome Android9/21/20211763
css.types.env.keyboard-inset-top 📋Chrome Android9/21/20211763
css.types.env.keyboard-inset-width 📋Chrome Android9/21/20211763
css.types.env.titlebar-area-height 📋Chrome Android8/31/20211784
Chrome: Before version 93, Linux is unsupported.Chrome Android: Before version 93, Linux is unsupported.Edge: Before version 93, Linux is unsupported.
css.types.env.titlebar-area-width 📋Chrome Android8/31/20211784
Chrome: Before version 93, Linux is unsupported.Chrome Android: Before version 93, Linux is unsupported.Edge: Before version 93, Linux is unsupported.
css.types.env.titlebar-area-x 📋Chrome Android8/31/20211784
Chrome: Before version 93, Linux is unsupported.Chrome Android: Before version 93, Linux is unsupported.Edge: Before version 93, Linux is unsupported.
css.types.env.titlebar-area-y 📋Chrome Android8/31/20211784
Chrome: Before version 93, Linux is unsupported.Chrome Android: Before version 93, Linux is unsupported.Edge: Before version 93, Linux is unsupported.
css.types.env.viewport-segment-bottom 📋Chrome Android6/24/2025391
css.types.env.viewport-segment-height 📋Chrome Android6/24/2025391
css.types.env.viewport-segment-left 📋Chrome Android6/24/2025391
css.types.env.viewport-segment-right 📋Chrome Android6/24/2025391
css.types.env.viewport-segment-top 📋Chrome Android6/24/2025391
css.types.env.viewport-segment-width 📋Chrome Android6/24/2025391
css.types.if 📋Chrome Android5/27/2025419
css.types.if.style Chrome Android5/27/2025419
css.types.if.style.range_syntax 📋Chrome Android10/28/2025265
css.types.image.cross-fade 📋Chrome Android6/27/20125136
Chrome: Supports the original dual-image with percentage implementation only.Chrome: See bug 40470742 for supporting the unprefixed cross-fade() function.Chrome Android: Supports the original dual-image with percentage implementation only.Chrome Android: See bug 40470742 for supporting the unprefixed cross-fade() function.Edge: Supports the original dual-image with percentage implementation only.Edge: See bug 40470742 for supporting the unprefixed cross-fade() function.Quest Browser: Supports the original dual-image with percentage implementation only.Quest Browser: See bug 40470742 for supporting the unprefixed cross-fade() function.Opera: Supports the original dual-image with percentage implementation only.Opera: See bug 40470742 for supporting the unprefixed cross-fade() function.Opera Android: Supports the original dual-image with percentage implementation only.Opera Android: See bug 40470742 for supporting the unprefixed cross-fade() function.Safari: Supports the original dual-image with percentage implementation only.Safari: Supports the original dual-image with percentage implementation only.Safari on iOS: Support for the original dual-image with percentage implementation only.Safari on iOS: Supports the original dual-image with percentage implementation only.Samsung Internet: Supports the original dual-image with percentage implementation only.Samsung Internet: See bug 40470742 for supporting the unprefixed cross-fade() function.WebView Android: Supports the original dual-image with percentage implementation only.WebView Android: See bug 40470742 for supporting the unprefixed cross-fade() function.WebView on iOS: Support for the original dual-image with percentage implementation only.WebView on iOS: Supports the original dual-image with percentage implementation only.
css.types.image.element 📋Firefox11/14/20173170
Firefox: -moz-element() is limited to background-image, background, border-image and border-image-source.Firefox: -moz-element() is limited to background-image and background.Firefox for Android: -moz-element() is limited to background-image, background, border-image and border-image-source.Firefox for Android: -moz-element() is limited to background-image and background.
css.types.image.paint 📋Chrome Android3/6/20183058
css.types.progress 📋Chrome Android6/24/2025391
css.types.ratio.number_value Firefox6/30/20202211
css.types.sibling-count 📋Chrome Android6/24/2025391
css.types.sibling-index 📋Chrome Android6/24/2025391
css.types.sign.typed_division_produces_unitless_number 📋Chrome Android9/2/2025321
css.types.superellipse 📋Chrome Android8/5/2025349
css.types.text-edge 📋Chrome Android2/4/2025531
css.types.text-edge.alphabetic 📋Chrome Android2/4/2025531
css.types.text-edge.cap 📋Chrome Android2/4/2025531
css.types.text-edge.ex 📋Chrome Android2/4/2025531
css.types.text-edge.text 📋Chrome Android2/4/2025531
css.types.type 📋Chrome Android8/5/2025349

HTML Data

API First Browser Date Days in Limbo Notes
html.elements.a.attributionsrc 📋Chrome Android5/14/2024797
html.elements.a.coords 📋Chrome Android6/27/20125136
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.href_sms Firefox4/24/20125200
html.elements.a.hreftranslate Chrome Android4/7/20202295
html.elements.a.interestfor Chrome Android10/28/2025265
html.elements.a.referrerpolicy.no-referrer-when-downgrade Chrome Android6/8/20163694
html.elements.a.referrerpolicy.origin-when-cross-origin Chrome Android6/8/20163694
html.elements.a.referrerpolicy.unsafe-url Chrome Android6/8/20163694
html.elements.a.shape 📋Chrome Android6/27/20125136
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.unfencedTop Chrome Android6/11/2024769
html.elements.area.attributionsrc 📋Chrome Android5/14/2024797
html.elements.area.interestfor Chrome Android10/28/2025265
html.elements.area.referrerpolicy.no-referrer-when-downgrade Chrome Android6/8/20163694
html.elements.area.referrerpolicy.origin-when-cross-origin Chrome Android6/8/20163694
html.elements.area.referrerpolicy.unsafe-url Chrome Android6/8/20163694
html.elements.audio.controlslist 📋Chrome Android4/25/20173373
html.elements.audio.disableremoteplayback 📋Chrome Android2/1/20173456
html.elements.button.interestfor Chrome Android10/28/2025265
html.elements.canvas.moz-opaque Firefox6/30/20096229
html.elements.datalist.input_type_color 📋Chrome Android2/26/20144527
html.elements.datalist.input_type_date 📋Chrome Android2/26/20144527
html.elements.datalist.input_type_time 📋Chrome Android2/26/20144527
html.elements.fencedframe 📋Chrome Android6/11/2024769
html.elements.fencedframe.allow 📋Chrome Android6/11/2024769
html.elements.fencedframe.height 📋Chrome Android6/11/2024769
html.elements.fencedframe.width 📋Chrome Android6/11/2024769
html.elements.form.autocomplete.new-password Firefox5/21/20192617
html.elements.geolocation 📋Chrome Android1/13/2026188
html.elements.geolocation.autolocate 📋Chrome Android1/13/2026188
html.elements.geolocation.watch 📋Chrome Android1/13/2026188
html.elements.h1.no_ua_styles_in_article_aside_nav_section 📋Firefox6/24/2025391
html.elements.hr.hr_in_select Firefox1/23/2024909
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.iframe.allow.accelerometer 📋Chrome Android4/17/20183016
html.elements.iframe.allow.ambient-light-sensor 📋Chrome Android4/17/20183016
html.elements.iframe.allow.attribution-reporting 📋Chrome Android9/12/20231042
html.elements.iframe.allow.bluetooth 📋Chrome Android8/2/20221448
html.elements.iframe.allow.browsing-topics Chrome Android7/21/20231095
html.elements.iframe.allow.cross-origin-isolated 📋Chrome Android11/17/20202071
html.elements.iframe.allow.document-domain 📋Firefox3/10/20202323
html.elements.iframe.allow.gamepad 📋Firefox8/10/20211805
Firefox: The default allowlist is * instead of self (as required by the specification).Firefox for Android: The default allowlist is * instead of self (as required by the specification).
html.elements.iframe.allow.gyroscope 📋Chrome Android4/17/20183016
html.elements.iframe.allow.hid 📋Chrome Android3/2/20211966
html.elements.iframe.allow.identity-credentials-get 📋Chrome Android2/7/20231259
html.elements.iframe.allow.idle-detection 📋Chrome Android9/21/20211763
html.elements.iframe.allow.magnetometer 📋Chrome Android4/17/20183016
html.elements.iframe.allow.otp-credentials 📋Chrome Android7/27/20202184
html.elements.iframe.allow.picture-in-picture 📋Chrome Android9/2/20221417
html.elements.iframe.allow.publickey-credentials-create 📋Firefox2/20/2024881
html.elements.iframe.allow.serial 📋Chrome Android3/2/20211966
html.elements.iframe.allow.speaker-selection 📋Firefox8/1/20231084
Firefox for Android: Not available due to a limitation in Android (see bug 1473346).
html.elements.iframe.allow.storage-access 📋Chrome Android5/2/20231175
html.elements.iframe.allow.usb 📋Chrome Android8/1/20173275
html.elements.iframe.allow.wildcards Chrome Android11/29/20221329
html.elements.iframe.allow.window-management 📋Chrome Android3/29/20221574
html.elements.iframe.allow.xr-spatial-tracking 📋Chrome Android12/17/20192407
html.elements.iframe.allowpaymentrequest Chrome Android8/1/20173275
html.elements.iframe.browsingtopics Chrome Android6/11/2024769
html.elements.iframe.credentialless 📋Chrome Android2/7/20231259
html.elements.iframe.csp 📋Chrome Android9/5/20173240
html.elements.iframe.privateToken 📋Chrome Android9/12/20231042
html.elements.iframe.referrerpolicy.no-referrer-when-downgrade Chrome Android6/8/20163694
html.elements.iframe.referrerpolicy.origin-when-cross-origin Chrome Android6/8/20163694
html.elements.iframe.referrerpolicy.unsafe-url Chrome Android6/8/20163694
html.elements.iframe.sandbox.allow-pointer-lock 📋Firefox9/20/20163590
html.elements.iframe.sandbox.allow-top-navigation-to-custom-protocols 📋Firefox5/31/20221511
html.elements.img.attributionsrc 📋Chrome Android5/14/2024797
html.elements.img.referrerpolicy.no-referrer-when-downgrade Chrome Android6/8/20163694
html.elements.img.referrerpolicy.origin-when-cross-origin Chrome Android6/8/20163694
html.elements.img.referrerpolicy.unsafe-url Chrome Android6/8/20163694
html.elements.img.sizes.auto 📋Chrome Android6/11/2024769
html.elements.input.capture 📋Chrome Android2/27/20134891
html.elements.input.type_color.accepts_css_colors 📋Firefox9/16/2025307
html.elements.input.type_color.list 📋Chrome Android2/26/20144527
html.elements.input.type_date.list 📋Chrome Android2/26/20144527
html.elements.input.type_month 📋Chrome Android2/27/20134891
Safari: The input type is recognized, but there is no month-specific control. See bug 200416.
html.elements.input.type_password.insecure_login_handling Firefox3/7/20173422
html.elements.input.type_time.list 📋Chrome Android2/26/20144527
html.elements.input.type_week 📋Chrome Android2/27/20134891
html.elements.link.blocking 📋Chrome Android9/2/20221417
html.elements.link.referrerpolicy.no-referrer-when-downgrade Chrome Android6/8/20163694
html.elements.link.referrerpolicy.origin-when-cross-origin Chrome Android6/8/20163694
html.elements.link.referrerpolicy.unsafe-url Chrome Android6/8/20163694
html.elements.link.rel.alternate_stylesheet 📋Firefox6/17/20086607
html.elements.link.rel.compression-dictionary 📋Chrome Android10/15/2024643
html.elements.link.rel.expect 📋Chrome Android4/16/2024825
html.elements.link.rel.manifest 📋Chrome Android11/12/20144268
html.elements.link.rel.modulepreload.as-json 📋Chrome Android4/7/2026104
html.elements.link.rel.modulepreload.as-style 📋Chrome Android4/7/2026104
html.elements.link.rel.preload.as-track Chrome Android4/13/20163750
html.elements.link.rel.prerender Chrome Android12/5/20173149
Chrome: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.Chrome Android: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.Edge: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.Quest Browser: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.Opera: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.Opera Android: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.WebView Android: Does not trigger prerendering. Triggers NoState Prefetch instead. See blog post.
html.elements.meta.name.application-title Chrome Android3/4/2025503
html.elements.meta.name.theme-color 📋Chrome Android7/20/20211826
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.meta.name.viewport 📋Chrome Android6/27/20125136
html.elements.meta.name.viewport.initial-scale 📋Chrome Android6/27/20125136
html.elements.meta.name.viewport.interactive-widget 📋Chrome Android11/29/20221329
html.elements.meta.name.viewport.interactive-widget.overlays-content 📋Chrome Android11/29/20221329
html.elements.meta.name.viewport.interactive-widget.resizes-content 📋Chrome Android11/29/20221329
html.elements.meta.name.viewport.interactive-widget.resizes-visual 📋Chrome Android11/29/20221329
html.elements.meta.name.viewport.maximum-scale 📋Chrome Android6/27/20125136
html.elements.meta.name.viewport.minimum-scale 📋Chrome Android6/27/20125136
html.elements.meta.name.viewport.user-scalable 📋Chrome Android6/27/20125136
html.elements.meta.name.viewport.viewport-fit 📋Chrome Android4/1/2025475
html.elements.meta.name.viewport.viewport-fit.auto 📋Chrome Android4/1/2025475
html.elements.meta.name.viewport.viewport-fit.cover 📋Chrome Android4/1/2025475
html.elements.meta.name.viewport.width 📋Chrome Android6/27/20125136
html.elements.script.attributionsrc 📋Chrome Android5/14/2024797
html.elements.script.blocking 📋Chrome Android9/2/20221417
html.elements.script.referrerpolicy.no-referrer-when-downgrade Chrome Android10/17/20182833
html.elements.script.referrerpolicy.origin-when-cross-origin Chrome Android10/17/20182833
html.elements.script.referrerpolicy.unsafe-url Chrome Android10/17/20182833
html.elements.script.type.importmap.multiple_import_maps 📋Chrome Android2/4/2025531
html.elements.script.type.speculationrules 📋Chrome Android1/10/20231287
Chrome: Initial support included same-origin prerendering only.Chrome Android: Initial support included same-origin prerendering only.Edge: Initial support included same-origin prerendering only.Quest Browser: Initial support included same-origin prerendering only.Opera: Initial support included same-origin prerendering only.Opera Android: Initial support included same-origin prerendering only.Samsung Internet: Initial support included same-origin prerendering only.WebView Android: Initial support included same-origin prerendering only.
html.elements.script.type.speculationrules.eagerness 📋Chrome Android1/23/2024909
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.expects_no_vary_search 📋Chrome Android7/23/2024727
Chrome: Supported for prefetch only.Chrome Android: Supported for prefetch only.Edge: Supported for prefetch only.Opera: Supported for prefetch only.Opera Android: Supported for prefetch only.Samsung Internet: Supported for prefetch only.WebView Android: Supported for prefetch only.
html.elements.script.type.speculationrules.prefetch 📋Chrome Android6/21/20221490
html.elements.script.type.speculationrules.prerender 📋Chrome Android6/21/20221490
html.elements.script.type.speculationrules.referrer_policy 📋Chrome Android3/7/20231231
html.elements.script.type.speculationrules.relative_to 📋Chrome Android1/23/2024909
html.elements.script.type.speculationrules.requires 📋Chrome Android6/21/20221490
html.elements.script.type.speculationrules.requires.anonymous-client-ip-when-cross-origin 📋Chrome Android6/21/20221490
html.elements.script.type.speculationrules.source_optional 📋Chrome Android2/20/2024881
html.elements.script.type.speculationrules.tag 📋Chrome Android4/29/2025447
html.elements.script.type.speculationrules.target_hint 📋Chrome Android6/24/2025391
Chrome: Only "_blank" and "_self" are supported and only for prefetch.Chrome Android: Only "_blank" and "_self" are supported and only for prefetch.Edge: Only "_blank" and "_self" are supported and only for prefetch.Opera: Only "_blank" and "_self" are supported and only for prefetch.Opera Android: Only "_blank" and "_self" are supported and only for prefetch.WebView Android: Only "_blank" and "_self" are supported and only for prefetch.
html.elements.script.type.speculationrules.urls 📋Chrome Android6/21/20221490
html.elements.script.type.speculationrules.where 📋Chrome Android1/23/2024909
html.elements.select.hr_in_select Firefox1/23/2024909
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.size 📋Firefox11/9/20047923
html.elements.selectedcontent 📋Chrome Android4/1/2025475
html.elements.style.blocking 📋Chrome Android9/2/20221417
html.elements.tbody.charoff Firefox11/9/20047923
Chrome: Since Chrome 1, the attribute can be set, but has no effect.Chrome Android: Since Chrome Android 18, the attribute can be set, but has no effect.Edge: Since Edge 79, the attribute can be set, but has no effect.Quest Browser: Since Quest Browser 5.0, the attribute can be set, but has no effect.Opera: Since Opera 15, the attribute can be set, but has no effect.Opera Android: Since Opera Android 14, the attribute can be set, but has no effect.Safari: Since Safari 3, the attribute can be set, but has no effect.Safari on iOS: Since Safari on iOS 2, the attribute can be set, but has no effect.Samsung Internet: Since Samsung Internet 1.0, the attribute can be set, but has no effect.WebView Android: Since WebView Android 4.4, the attribute can be set, but has no effect.WebView on iOS: Since WebView on iOS 2, the attribute can be set, but has no effect.
html.elements.td.charoff Firefox11/9/20047923
Chrome: Since Chrome 1, the attribute can be set, but has no effect.Chrome Android: Since Chrome Android 18, the attribute can be set, but has no effect.Edge: Since Edge 79, the attribute can be set, but has no effect.Quest Browser: Since Quest Browser 5.0, the attribute can be set, but has no effect.Opera: Since Opera 15, the attribute can be set, but has no effect.Opera Android: Since Opera Android 14, the attribute can be set, but has no effect.Safari: Since Safari 3, the attribute can be set, but has no effect.Safari on iOS: Since Safari on iOS 2, the attribute can be set, but has no effect.Samsung Internet: Since Samsung Internet 1.0, the attribute can be set, but has no effect.WebView Android: Since WebView Android 4.4, the attribute can be set, but has no effect.WebView on iOS: Since WebView on iOS 2, the attribute can be set, but has no effect.
html.elements.template.shadowrootserializable 📋Chrome Android5/14/2024797
html.elements.textarea.autocomplete.new-password Firefox5/21/20192617
html.elements.textarea.autocomplete.webauthn 📋Chrome Android11/29/20221329
html.elements.textarea.wrap.hard Chrome Android6/27/20125136
html.elements.tfoot.charoff Firefox11/9/20047923
Chrome: Since Chrome 1, the attribute can be set, but has no effect.Chrome Android: Since Chrome Android 18, the attribute can be set, but has no effect.Edge: Since Edge 79, the attribute can be set, but has no effect.Quest Browser: Since Quest Browser 5.0, the attribute can be set, but has no effect.Opera: Since Opera 15, the attribute can be set, but has no effect.Opera Android: Since Opera Android 14, the attribute can be set, but has no effect.Safari: Since Safari 3, the attribute can be set, but has no effect.Safari on iOS: Since Safari on iOS 2, the attribute can be set, but has no effect.Samsung Internet: Since Samsung Internet 1.0, the attribute can be set, but has no effect.WebView Android: Since WebView Android 4.4, the attribute can be set, but has no effect.WebView on iOS: Since WebView on iOS 2, the attribute can be set, but has no effect.
html.elements.th.charoff Firefox11/9/20047923
Chrome: Since Chrome 1, the attribute can be set, but has no effect.Chrome Android: Since Chrome Android 18, the attribute can be set, but has no effect.Edge: Since Edge 79, the attribute can be set, but has no effect.Quest Browser: Since Quest Browser 5.0, the attribute can be set, but has no effect.Opera: Since Opera 15, the attribute can be set, but has no effect.Opera Android: Since Opera Android 14, the attribute can be set, but has no effect.Safari: Since Safari 3, the attribute can be set, but has no effect.Safari on iOS: Since Safari on iOS 2, the attribute can be set, but has no effect.Samsung Internet: Since Samsung Internet 1.0, the attribute can be set, but has no effect.WebView Android: Since WebView Android 4.4, the attribute can be set, but has no effect.WebView on iOS: Since WebView on iOS 2, the attribute can be set, but has no effect.
html.elements.th.rowspan.rowspan_zero Firefox8/8/20173268
html.elements.thead.charoff Firefox11/9/20047923
Chrome: Since Chrome 1, the attribute can be set, but has no effect.Chrome Android: Since Chrome Android 18, the attribute can be set, but has no effect.Edge: Since Edge 79, the attribute can be set, but has no effect.Quest Browser: Since Quest Browser 5.0, the attribute can be set, but has no effect.Opera: Since Opera 15, the attribute can be set, but has no effect.Opera Android: Since Opera Android 14, the attribute can be set, but has no effect.Safari: Since Safari 3, the attribute can be set, but has no effect.Safari on iOS: Since Safari on iOS 2, the attribute can be set, but has no effect.Samsung Internet: Since Samsung Internet 1.0, the attribute can be set, but has no effect.WebView Android: Since WebView Android 4.4, the attribute can be set, but has no effect.WebView on iOS: Since WebView on iOS 2, the attribute can be set, but has no effect.
html.elements.video.controlslist 📋Chrome Android4/25/20173373
html.elements.video.disableremoteplayback 📋Chrome Android2/1/20173456
html.elements.video.playsinline 📋Chrome Android6/4/20192603
html.global_attributes.autocorrect 📋Firefox3/4/2025503
html.global_attributes.popover.hint 📋Chrome Android2/4/2025531
html.global_attributes.virtualkeyboardpolicy 📋Chrome Android9/21/20211763
html.global_attributes.writingsuggestions 📋Chrome Android4/16/2024825