For a given set of browsers what APIs are still considred experimental, and how long have they been experimental?
Below is a list of features that are marked as "Experimental" in Chrome and Safari
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| css.at-rules.keyframes.named_range_keyframes 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.at-rules.media.display-mode.picture-in-picture 📋 | Chrome | 3/19/2024 | 911 | |||
| css.at-rules.media.prefers-reduced-data 📋 | Chrome | 8/25/2020 | 2213 | |||
| css.at-rules.media.prefers-reduced-transparency 📋 | Chrome | 10/10/2023 | 1072 | |||
| css.at-rules.page.bottom-center 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.bottom-left 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.bottom-left-corner 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.bottom-right 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.bottom-right-corner 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.left-bottom 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.left-middle 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.left-top 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.right-bottom 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.right-middle 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.right-top 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.top-center 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.top-left 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.top-left-corner 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.top-right 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.page.top-right-corner 📋 | Chrome | 11/12/2024 | 673 | |||
| css.at-rules.position-try 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.-webkit-app-region | Chrome | 1/10/2013 | 4997 | |||
| css.properties.-webkit-column-axis | Safari | 7/25/2012 | 5166 | |||
| css.properties.-webkit-column-progression | Safari | 10/22/2013 | 4712 | |||
| css.properties.-webkit-cursor-visibility | Safari | 10/22/2013 | 4712 | |||
| css.properties.-webkit-hyphenate-limit-after | Safari | 7/20/2011 | 5537 | |||
| css.properties.-webkit-hyphenate-limit-before | Safari | 7/20/2011 | 5537 | |||
| css.properties.-webkit-hyphenate-limit-lines | Safari | 7/25/2012 | 5166 | |||
| css.properties.-webkit-line-align | Safari | 7/25/2012 | 5166 | |||
| css.properties.-webkit-line-box-contain | Safari | 7/20/2011 | 5537 | |||
| css.properties.-webkit-line-grid | Safari | 7/25/2012 | 5166 | |||
| css.properties.-webkit-line-snap | Safari | 7/25/2012 | 5166 | |||
| css.properties.-webkit-mask-source-type | Safari | 10/22/2013 | 4712 | |||
| css.properties.-webkit-nbsp-mode | Safari | 6/8/2009 | 6309 | |||
| css.properties.-webkit-text-zoom | Safari | 9/20/2016 | 3648 | |||
| css.properties.align-items.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.align-self.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.anchor-name 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.anchor-name.none 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.anchor-scope 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.anchor-scope.all 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.anchor-scope.none 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.animation-duration.auto 📋 | Chrome | 7/18/2023 | 1156 | 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 | 7/18/2023 | 1156 | |||
| css.properties.animation-range-end 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.animation-range-end.normal 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.animation-range-start 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.animation-range-start.normal 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.animation-timeline 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.animation-timeline.scroll 📋 | Chrome | 7/18/2023 | 1156 | Firefox: Zero scroll range is treated as 100% but should be 0% (see bug 1780865).Firefox: Supports the deprecated horizontal and vertical axis values, and not the x and y values. | ||
| css.properties.animation-timeline.view 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.block-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.bottom.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.bottom.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.container-type.scroll-state 📋 | Chrome | 2/4/2025 | 589 | |||
| css.properties.display.math | Chrome | 1/10/2023 | 1345 | |||
| css.properties.field-sizing 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.field-sizing.content 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.field-sizing.fixed 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.font-family.math | Chrome | 1/10/2023 | 1345 | |||
| css.properties.font-palette.animation_computed | Chrome | 1/23/2024 | 967 | |||
| css.properties.font-palette.palette-mix_function 📋 | Chrome | 1/23/2024 | 967 | |||
| css.properties.font-variant-emoji.emoji 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.font-variant-emoji.normal 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.font-variant-emoji.text 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.font-variant-emoji.unicode 📋 | Chrome | 11/12/2024 | 673 | |||
| css.properties.forced-color-adjust.preserve-parent-color 📋 | Chrome | 9/27/2022 | 1450 | |||
| css.properties.height.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.hyphenate-limit-chars.auto 📋 | Chrome | 1/10/2023 | 1345 | |||
| css.properties.inline-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-block.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-block.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-block-end.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-block-end.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-block-start.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-block-start.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-inline.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-inline.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-inline-end.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-inline-end.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.inset-inline-start.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.inset-inline-start.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.interpolate-size 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.interpolate-size.allow-keywords 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.interpolate-size.numeric-only 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.justify-items.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.justify-self.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.left.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.left.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.line-height-step 📋 | Chrome | 7/25/2017 | 3340 | |||
| css.properties.margin.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-block.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-block-end.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-block-start.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-bottom.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-inline.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-inline-end.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-inline-start.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-left.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-right.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-top.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.margin-trim 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.block 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.block-end 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.block-start 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.inline 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.inline-end 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.inline-start 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.margin-trim.none 📋 | Safari | 3/27/2023 | 1269 | |||
| css.properties.math-shift 📋 | Chrome | 1/10/2023 | 1345 | |||
| css.properties.max-block-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.max-height.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.max-height.stretch 📋 | Chrome | 7/9/2013 | 4817 | |||
| css.properties.max-inline-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.max-width.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.max-width.stretch 📋 | Chrome | 9/25/2012 | 5104 | |||
| css.properties.min-block-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.min-height.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.min-height.stretch | Chrome | 7/9/2013 | Safari | 9/30/2015 | 813 | |
| css.properties.min-inline-size.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.min-width.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.min-width.stretch | Chrome | 9/25/2012 | 5104 | |||
| css.properties.mix-blend-mode.plus-darker 📋 | Safari | 3/24/2020 | 2367 | |||
| css.properties.object-view-box 📋 | Chrome | 8/2/2022 | 1506 | |||
| css.properties.object-view-box.none 📋 | Chrome | 8/2/2022 | 1506 | |||
| css.properties.offset-path.margin-box 📋 | Safari | 9/16/2024 | 730 | |||
| css.properties.overflow-clip-margin.border-box 📋 | Chrome | 8/2/2022 | 1506 | |||
| css.properties.overflow-clip-margin.content-box 📋 | Chrome | 8/2/2022 | 1506 | |||
| css.properties.overflow-clip-margin.padding-box 📋 | Chrome | 8/2/2022 | 1506 | |||
| css.properties.overlay 📋 | Chrome | 9/12/2023 | 1100 | |||
| css.properties.overlay.auto 📋 | Chrome | 9/12/2023 | 1100 | |||
| css.properties.overlay.none 📋 | Chrome | 9/12/2023 | 1100 | |||
| css.properties.place-items.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.place-self.anchor-center 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-anchor.auto 📋 | Chrome | 5/14/2024 | 855 | Chrome: The generic auto value exists, but it does not yet have the effect described in the spec.Chrome Android: The generic auto value exists, but it does not yet have the effect described in the spec.Edge: The generic auto value exists, but it does not yet have the effect described in the spec.Opera: The generic auto value exists, but it does not yet have the effect described in the spec.Opera Android: The generic auto value exists, but it does not yet have the effect described in the spec.Samsung Internet: The generic auto value exists, but it does not yet have the effect described in the spec.WebView Android: The generic auto value exists, but it does not yet have the effect described in the spec. | ||
| css.properties.position-area 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.block-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.block-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.bottom 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.center 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.inline-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.inline-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.left 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.none 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.right 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.self-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.self-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-all 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-block-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-block-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-bottom 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-inline-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-inline-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-top 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-x-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-x-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-y-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.span-y-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.top 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.x-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.x-self-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.x-self-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.x-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.y-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.y-self-end 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.y-self-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-area.y-start 📋 | Chrome | 9/17/2024 | 729 | |||
| css.properties.position-try 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-fallbacks 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.position-try-fallbacks.flip-block 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.position-try-fallbacks.flip-inline 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.position-try-fallbacks.flip-start 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.position-try-fallbacks.none 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.position-try-fallbacks.position-area 📋 | Chrome | 8/20/2024 | 757 | Chrome: inset-area values had to be wrapped inside an inset-area() function.Chrome Android: inset-area values had to be wrapped inside an inset-area() function.Edge: inset-area values had to be wrapped inside an inset-area() function.Opera: inset-area values had to be wrapped inside an inset-area() function.Opera Android: inset-area values had to be wrapped inside an inset-area() function.Samsung Internet: inset-area values had to be wrapped inside an inset-area() function.WebView Android: inset-area values had to be wrapped inside an inset-area() function. | ||
| css.properties.position-try-order 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-order.most-block-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-order.most-height 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-order.most-inline-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-order.most-width 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-try-order.normal 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-visibility 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-visibility.always 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-visibility.anchors-visible 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.position-visibility.no-overflow 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.reading-flow 📋 | Chrome | 8/20/2024 | 757 | |||
| css.properties.right.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.right.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.scroll-initial-target 📋 | Chrome | 2/4/2025 | 589 | |||
| css.properties.scroll-initial-target.nearest 📋 | Chrome | 2/4/2025 | 589 | |||
| css.properties.scroll-initial-target.none 📋 | Chrome | 2/4/2025 | 589 | |||
| css.properties.scroll-timeline 📋 | Chrome | 7/18/2023 | 1156 | Firefox: The syntax of the shorthand property uses the fixed order of name and then the axis.Firefox: Supports the deprecated horizontal and vertical axis values, and not the x and y values.Firefox: The @scroll-timeline at-rule is replaced with the longhand properties scroll-timeline-name and scroll-timeline-axis and the shorthand property scroll-timeline. | ||
| css.properties.scroll-timeline-axis 📋 | Chrome | 7/18/2023 | 1156 | Firefox: The syntax of the shorthand property uses the fixed order of name and then the axis.Firefox: Supports the deprecated horizontal and vertical values, and not the x and y values.Firefox: The @scroll-timeline at-rule is replaced with the longhand properties scroll-timeline-name and scroll-timeline-axis and the shorthand property scroll-timeline. | ||
| css.properties.scroll-timeline-axis.block 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.scroll-timeline-axis.inline 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.scroll-timeline-axis.x 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.scroll-timeline-axis.y 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.scroll-timeline-name 📋 | Chrome | 7/18/2023 | 1156 | Firefox: The syntax of the shorthand property uses the fixed order of name and then the axis.Firefox: The @scroll-timeline at-rule is replaced with the longhand properties scroll-timeline-name and scroll-timeline-axis and the shorthand property scroll-timeline. | ||
| css.properties.speak-as 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.speak-as.digits 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.speak-as.literal-punctuation 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.speak-as.no-punctuation 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.speak-as.normal 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.speak-as.spell-out 📋 | Safari | 4/12/2018 | 3079 | |||
| css.properties.stroke-color 📋 | Safari | 3/24/2020 | 2367 | |||
| css.properties.text-decoration-line.grammar-error 📋 | Chrome | 1/23/2024 | 967 | |||
| css.properties.text-decoration-line.spelling-error 📋 | Chrome | 1/23/2024 | 967 | |||
| css.properties.text-decoration-skip 📋 | Safari | 3/25/2019 | 2732 | Chrome: Only supports the deprecated ink value.Chrome Android: Only supports the deprecated ink value.Opera: Only supports the deprecated ink value.Opera Android: Only supports the deprecated ink value.Safari: Supports only none, auto, and objects values.Safari: Supports only none, auto, and objects values.Safari on iOS: Supports only none, auto, and objects values.Safari on iOS: Supports only none, auto, and objects values.Samsung Internet: Only supports the deprecated ink value.WebView Android: Only supports the deprecated ink value.WebView on iOS: Supports only none, auto, and objects values.WebView on iOS: Supports only none, auto, and objects values. | ||
| css.properties.text-decoration-skip.auto 📋 | Safari | 3/24/2020 | 2367 | |||
| css.properties.text-decoration-skip.none 📋 | Safari | 3/24/2020 | 2367 | |||
| css.properties.text-size-adjust 📋 | Chrome | 10/12/2016 | 3626 | |||
| css.properties.text-size-adjust.auto 📋 | Chrome | 10/12/2016 | 3626 | |||
| css.properties.text-size-adjust.none 📋 | Chrome | 10/12/2016 | 3626 | |||
| css.properties.text-size-adjust.percentages 📋 | Chrome | 10/12/2016 | 3626 | |||
| css.properties.text-spacing-trim 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.text-spacing-trim.normal 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.text-spacing-trim.space-all 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.text-spacing-trim.space-first 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.text-spacing-trim.trim-start 📋 | Chrome | 3/19/2024 | 911 | |||
| css.properties.text-wrap-style.pretty 📋 | Chrome | 10/15/2024 | 701 | |||
| css.properties.timeline-scope 📋 | Chrome | 8/15/2023 | 1128 | |||
| css.properties.timeline-scope.all 📋 | Chrome | 8/15/2023 | 1128 | |||
| css.properties.timeline-scope.none 📋 | Chrome | 8/15/2023 | 1128 | |||
| css.properties.top.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.top.anchor-size 📋 | Chrome | 1/14/2025 | 610 | |||
| css.properties.view-timeline 📋 | Chrome | 7/18/2023 | 1156 | Firefox: Now supports the x and y values, and also the deprecated horizontal and vertical values. | ||
| css.properties.view-timeline-axis 📋 | Chrome | 7/18/2023 | 1156 | Firefox: Now supports the x and y values, and also the deprecated horizontal and vertical values. | ||
| css.properties.view-timeline-axis.block 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-axis.inline 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-axis.x 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-axis.y 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-inset 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-inset.auto 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.view-timeline-name 📋 | Chrome | 7/18/2023 | 1156 | |||
| css.properties.white-space.shorthand_values | Chrome | 5/30/2023 | 1205 | Chrome: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.Chrome Android: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.Edge: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.Opera: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.Opera Android: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.Samsung Internet: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim.WebView Android: Only accepts values for white-space-collapse and text-wrap-mode, not white-space-trim. | ||
| css.properties.width.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.properties.word-break.auto-phrase 📋 | Chrome | 10/31/2023 | 1051 | 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.-webkit-slider-runnable-track | Chrome | 5/19/2020 | 2311 | |||
| css.selectors.-webkit-slider-thumb | Chrome | 5/19/2020 | 2311 | |||
| css.selectors.active-view-transition-type 📋 | Chrome | 5/14/2024 | 855 | |||
| css.selectors.details-content 📋 | Chrome | 11/12/2024 | 673 | |||
| css.selectors.open 📋 | Chrome | 2/4/2025 | 589 | Chrome: The selector is recognized, but has no effect.Chrome Android: The selector is recognized, but has no effect.Edge: The selector is recognized, but has no effect.Opera: The selector is recognized, but has no effect.Opera Android: The selector is recognized, but has no effect.Samsung Internet: The selector is recognized, but has no effect.WebView Android: The selector is recognized, but has no effect. | ||
| css.selectors.xr-overlay 📋 | Chrome | 5/19/2020 | 2311 | |||
| css.types.anchor 📋 | Chrome | 5/14/2024 | 855 | |||
| css.types.anchor-size 📋 | Chrome | 5/14/2024 | 855 | |||
| css.types.anchor-size.inset_margin | Chrome | 1/14/2025 | 610 | |||
| css.types.attr.type-or-unit | Chrome | 2/4/2025 | 589 | |||
| css.types.calc-size 📋 | Chrome | 9/17/2024 | 729 |
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| html.elements.a.attributionsourceid 📋 | Safari | 4/26/2021 | 1969 | |||
| html.elements.a.attributionsrc 📋 | Chrome | 5/14/2024 | 855 | |||
| html.elements.a.hreftranslate | Chrome | 4/7/2020 | 2353 | |||
| html.elements.a.target.unfencedTop | Chrome | 7/18/2023 | 1156 | |||
| html.elements.fencedframe 📋 | Chrome | 7/18/2023 | 1156 | |||
| html.elements.fencedframe.allow 📋 | Chrome | 7/18/2023 | 1156 | |||
| html.elements.fencedframe.height 📋 | Chrome | 7/18/2023 | 1156 | |||
| html.elements.fencedframe.width 📋 | Chrome | 7/18/2023 | 1156 | |||
| html.elements.form.autocomplete.webauthn 📋 | Chrome | 11/29/2022 | 1387 | |||
| html.elements.iframe.allow.accelerometer 📋 | Chrome | 4/17/2018 | 3074 | |||
| html.elements.iframe.allow.ambient-light-sensor 📋 | Chrome | 4/17/2018 | 3074 | |||
| html.elements.iframe.allow.attribution-reporting 📋 | Chrome | 9/12/2023 | 1100 | |||
| html.elements.iframe.allow.bluetooth 📋 | Chrome | 8/2/2022 | 1506 | |||
| html.elements.iframe.allow.browsing-topics | Chrome | 7/18/2023 | 1156 | |||
| html.elements.iframe.allow.compute-pressure 📋 | Chrome | 5/14/2024 | 855 | |||
| html.elements.iframe.allow.cross-origin-isolated 📋 | Chrome | 11/17/2020 | 2129 | |||
| html.elements.iframe.allow.document-domain 📋 | Chrome | 1/23/2018 | 3158 | |||
| html.elements.iframe.allow.gyroscope 📋 | Chrome | 4/17/2018 | 3074 | |||
| html.elements.iframe.allow.hid 📋 | Chrome | 3/2/2021 | 2024 | |||
| html.elements.iframe.allow.identity-credentials-get 📋 | Chrome | 2/7/2023 | 1317 | |||
| html.elements.iframe.allow.idle-detection 📋 | Chrome | 9/21/2021 | 1821 | |||
| html.elements.iframe.allow.local-fonts 📋 | Chrome | 6/21/2022 | 1548 | |||
| html.elements.iframe.allow.magnetometer 📋 | Chrome | 4/17/2018 | 3074 | |||
| html.elements.iframe.allow.otp-credentials 📋 | Chrome | 8/31/2021 | 1842 | |||
| html.elements.iframe.allow.picture-in-picture 📋 | Chrome | 12/4/2018 | 2843 | |||
| html.elements.iframe.allow.serial 📋 | Chrome | 3/2/2021 | 2024 | |||
| html.elements.iframe.allow.storage-access 📋 | Chrome | 5/2/2023 | 1233 | |||
| html.elements.iframe.allow.usb 📋 | Chrome | 7/25/2017 | 3340 | |||
| html.elements.iframe.allow.wildcards | Chrome | 11/29/2022 | 1387 | |||
| html.elements.iframe.allow.window-management 📋 | Chrome | 3/29/2022 | 1632 | |||
| html.elements.iframe.allow.xr-spatial-tracking 📋 | Chrome | 12/10/2019 | 2472 | |||
| html.elements.iframe.browsingtopics | Chrome | 7/18/2023 | 1156 | |||
| html.elements.iframe.credentialless 📋 | Chrome | 2/7/2023 | 1317 | |||
| html.elements.iframe.csp 📋 | Chrome | 9/5/2017 | 3298 | |||
| html.elements.img.attributionsrc 📋 | Chrome | 5/14/2024 | 855 | |||
| html.elements.link.rel.expect 📋 | Chrome | 4/16/2024 | 883 | |||
| html.elements.meta.name.application-title | Chrome | 3/4/2025 | 561 | |||
| html.elements.script.attributionsrc 📋 | Chrome | 5/14/2024 | 855 | |||
| html.elements.script.type.importmap.multiple_import_maps 📋 | Chrome | 2/4/2025 | 589 | |||
| html.elements.script.type.speculationrules 📋 | Chrome | 1/10/2023 | 1345 | 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. | ||
| html.elements.script.type.speculationrules.eagerness | Chrome | 1/23/2024 | 967 | |||
| html.elements.script.type.speculationrules.expects_no_vary_search | Chrome | 7/23/2024 | 785 | 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. | ||
| html.elements.script.type.speculationrules.prefetch | Chrome | 2/7/2023 | 1317 | |||
| html.elements.script.type.speculationrules.prerender | Chrome | 9/2/2022 | 1475 | |||
| html.elements.script.type.speculationrules.referrer_policy | Chrome | 3/7/2023 | 1289 | |||
| html.elements.script.type.speculationrules.relative_to | Chrome | 1/23/2024 | 967 | |||
| html.elements.script.type.speculationrules.requires | Chrome | 2/7/2023 | 1317 | |||
| html.elements.script.type.speculationrules.requires.anonymous-client-ip-when-cross-origin | Chrome | 2/7/2023 | 1317 | |||
| html.elements.script.type.speculationrules.source_optional | Chrome | 2/20/2024 | 939 | |||
| html.elements.script.type.speculationrules.urls | Chrome | 1/10/2023 | 1345 | |||
| html.elements.script.type.speculationrules.where | Chrome | 1/23/2024 | 967 | |||
| html.elements.template.shadowrootserializable 📋 | Chrome | 5/14/2024 | 855 | |||
| html.elements.textarea.autocomplete.webauthn 📋 | Chrome | 11/29/2022 | 1387 | |||
| html.global_attributes.autocorrect 📋 | Safari | 4/26/2021 | 1969 | Safari: Takes values of true/false (instead of on/off).Safari: Allowed on <input type='password'> elements.Safari on iOS: Takes values of true/false (instead of on/off).Safari on iOS: Allowed on <input type='password'> elements. | ||
| html.global_attributes.hidden.until-found 📋 | Chrome | 5/24/2022 | 1576 | |||
| html.global_attributes.virtualkeyboardpolicy 📋 | Chrome | 9/21/2021 | 1821 | |||
| html.manifest.display_override 📋 | Chrome | 3/2/2021 | 2024 | Chrome: display_override and/or display are required for a web app to be installable.Chrome Android: display_override and/or display are required for a web app to be installable.Edge: display_override and/or display are required for a web app to be installable.Quest Browser: display_override and/or display are required for a web app to be installable.Opera: display_override and/or display are required for a web app to be installable.Opera Android: display_override and/or display are required for a web app to be installable.Samsung Internet: display_override and/or display are required for a web app to be installable. | ||
| html.manifest.display_override.tabbed 📋 | Chrome | 6/11/2024 | 827 | |||
| html.manifest.display_override.window-controls-overlay 📋 | Chrome | 9/2/2022 | 1475 | |||
| html.manifest.file_handlers 📋 | Chrome | 5/24/2022 | 1576 | |||
| html.manifest.launch_handler 📋 | Chrome | 2/7/2023 | 1317 | |||
| html.manifest.launch_handler.client_mode 📋 | Chrome | 2/7/2023 | 1317 | |||
| html.manifest.note_taking 📋 | Chrome | 10/19/2021 | 1793 | |||
| html.manifest.note_taking.new_note_url 📋 | Chrome | 10/19/2021 | 1793 | |||
| html.manifest.protocol_handlers 📋 | Chrome | 11/15/2021 | 1766 | |||
| html.manifest.protocol_handlers.protocol 📋 | Chrome | 11/15/2021 | 1766 | |||
| html.manifest.protocol_handlers.url 📋 | Chrome | 11/15/2021 | 1766 | |||
| html.manifest.serviceworker | Chrome | 10/16/2018 | 2892 | |||
| html.manifest.serviceworker.scope | Chrome | 10/16/2018 | 2892 | |||
| html.manifest.serviceworker.src | Chrome | 10/16/2018 | 2892 | |||
| html.manifest.serviceworker.use_cache | Chrome | 10/16/2018 | 2892 | |||
| html.manifest.share_target 📋 | Chrome | 3/2/2021 | 2024 | Firefox for Android: The property parses, but has no effect. |