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 Edge and Firefox
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| css.at-rules.keyframes.named_range_keyframes 📋 | Edge | 7/21/2023 | 1108 | |||
| css.at-rules.media.display-mode.picture-in-picture 📋 | Edge | 3/22/2024 | 863 | |||
| css.at-rules.media.prefers-reduced-data 📋 | Edge | 8/27/2020 | 2166 | |||
| css.at-rules.media.prefers-reduced-transparency 📋 | Firefox | 5/9/2023 | Edge | 10/13/2023 | 157 | |
| css.at-rules.page.bottom-center 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.bottom-left 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.bottom-left-corner 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.bottom-right 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.bottom-right-corner 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.left-bottom 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.left-middle 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.left-top 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.right-bottom 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.right-middle 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.right-top 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.top-center 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.top-left 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.top-left-corner 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.top-right 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.page.top-right-corner 📋 | Edge | 11/14/2024 | 626 | |||
| css.at-rules.position-try 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.-webkit-app-region | Edge | 1/15/2020 | 2391 | |||
| css.properties.align-items.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.align-self.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.anchor-name 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.anchor-name.none 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.anchor-scope 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.anchor-scope.all 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.anchor-scope.none 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.animation-duration.auto 📋 | Edge | 7/21/2023 | 1108 | 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 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.animation-range-end 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.animation-range-end.normal 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.animation-range-start 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.animation-range-start.normal 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.animation-timeline 📋 | Firefox | 2/14/2023 | Edge | 7/21/2023 | 157 | |
| css.properties.animation-timeline.scroll 📋 | Firefox | 2/14/2023 | Edge | 7/21/2023 | 157 | 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 📋 | Firefox | 6/6/2023 | Edge | 7/21/2023 | 45 | |
| css.properties.background-image.element 📋 | Firefox | 3/22/2011 | 5612 | |||
| css.properties.block-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.block-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.bottom.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.bottom.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.break-after.always | Firefox | 1/7/2020 | 2399 | |||
| css.properties.break-before.always | Firefox | 1/7/2020 | 2399 | |||
| css.properties.container-type.scroll-state 📋 | Edge | 2/6/2025 | 542 | |||
| css.properties.content.none_applies_to_elements | Firefox | 8/10/2021 | 1818 | |||
| css.properties.counter-reset.reset_does_not_affect_siblings | Firefox | 10/20/2020 | 2112 | |||
| css.properties.counter-reset.reversed 📋 | Firefox | 1/11/2022 | 1664 | |||
| css.properties.display.math | Edge | 1/12/2023 | 1298 | |||
| css.properties.field-sizing 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.field-sizing.content 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.field-sizing.fixed 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.font-family.math | Edge | 1/12/2023 | 1298 | |||
| css.properties.font-palette.animation_computed | Edge | 1/25/2024 | 920 | |||
| css.properties.font-palette.palette-mix_function 📋 | Edge | 1/25/2024 | 920 | |||
| css.properties.font-synthesis-position 📋 | Firefox | 9/26/2023 | 1041 | |||
| css.properties.font-synthesis-position.auto 📋 | Firefox | 9/26/2023 | 1041 | |||
| css.properties.font-synthesis-position.none 📋 | Firefox | 9/26/2023 | 1041 | |||
| css.properties.font-variant-emoji.emoji 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.font-variant-emoji.normal 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.font-variant-emoji.text 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.font-variant-emoji.unicode 📋 | Edge | 11/14/2024 | 626 | |||
| css.properties.forced-color-adjust.preserve-parent-color 📋 | Edge | 10/3/2022 | 1399 | |||
| css.properties.grid-template-columns.masonry 📋 | Firefox | 6/2/2020 | 2252 | |||
| css.properties.grid-template-rows.masonry 📋 | Firefox | 6/2/2020 | 2252 | |||
| css.properties.height.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.height.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.hyphenate-limit-chars.auto 📋 | Edge | 1/12/2023 | 1298 | |||
| css.properties.image-rendering.smooth 📋 | Firefox | 10/5/2021 | 1762 | |||
| css.properties.inline-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inline-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.inset.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-block.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-block.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-block-end.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-block-end.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-block-start.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-block-start.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-inline.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-inline.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-inline-end.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-inline-end.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.inset-inline-start.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.inset-inline-start.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.interpolate-size 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.interpolate-size.allow-keywords 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.interpolate-size.numeric-only 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.justify-items.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.justify-self.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.left.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.left.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.line-height-step 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.margin.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-block.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-block-end.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-block-start.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-bottom.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-inline.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-inline-end.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-inline-start.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-left.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-right.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.margin-top.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.math-shift 📋 | Edge | 1/12/2023 | 1298 | |||
| css.properties.max-block-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.max-block-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.max-height.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.max-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.max-height.stretch 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.max-inline-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.max-inline-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.max-width.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.max-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.max-width.stretch 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.min-block-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.min-block-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.min-height.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.min-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.min-height.stretch | Edge | 1/15/2020 | 2391 | |||
| css.properties.min-inline-size.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.min-inline-size.fit-content_function | Firefox | 8/10/2021 | 1818 | |||
| css.properties.min-width.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.min-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.min-width.stretch | Edge | 1/15/2020 | 2391 | |||
| css.properties.object-view-box 📋 | Edge | 8/5/2022 | 1458 | |||
| css.properties.object-view-box.none 📋 | Edge | 8/5/2022 | 1458 | |||
| css.properties.overflow-block.overlay | Firefox | 4/11/2023 | 1209 | |||
| css.properties.overflow-clip-margin.border-box 📋 | Edge | 8/5/2022 | 1458 | |||
| css.properties.overflow-clip-margin.content-box 📋 | Edge | 8/5/2022 | 1458 | |||
| css.properties.overflow-clip-margin.padding-box 📋 | Edge | 8/5/2022 | 1458 | |||
| css.properties.overflow-inline.overlay | Firefox | 4/11/2023 | 1209 | |||
| css.properties.overlay 📋 | Edge | 9/15/2023 | 1052 | |||
| css.properties.overlay.auto 📋 | Edge | 9/15/2023 | 1052 | |||
| css.properties.overlay.none 📋 | Edge | 9/15/2023 | 1052 | |||
| css.properties.place-items.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.place-self.anchor-center 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-anchor.auto 📋 | Edge | 5/17/2024 | 807 | 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 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.block-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.block-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.bottom 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.center 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.inline-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.inline-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.left 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.none 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.right 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.self-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.self-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-all 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-block-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-block-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-bottom 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-inline-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-inline-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-top 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-x-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-x-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-y-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.span-y-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.top 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.x-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.x-self-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.x-self-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.x-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.y-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.y-self-end 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.y-self-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-area.y-start 📋 | Edge | 9/19/2024 | 682 | |||
| css.properties.position-try 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-fallbacks 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.position-try-fallbacks.flip-block 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.position-try-fallbacks.flip-inline 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.position-try-fallbacks.flip-start 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.position-try-fallbacks.none 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.position-try-fallbacks.position-area 📋 | Edge | 8/22/2024 | 710 | 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 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-order.most-block-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-order.most-height 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-order.most-inline-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-order.most-width 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-try-order.normal 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-visibility 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-visibility.always 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-visibility.anchors-visible 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.position-visibility.no-overflow 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.reading-flow 📋 | Edge | 8/22/2024 | 710 | |||
| css.properties.right.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.right.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.ruby-position.alternate | Firefox | 4/19/2021 | 1931 | |||
| css.properties.scroll-initial-target 📋 | Edge | 2/6/2025 | 542 | |||
| css.properties.scroll-initial-target.nearest 📋 | Edge | 2/6/2025 | 542 | |||
| css.properties.scroll-initial-target.none 📋 | Edge | 2/6/2025 | 542 | |||
| css.properties.scroll-timeline 📋 | Firefox | 3/14/2023 | Edge | 7/21/2023 | 129 | 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 📋 | Firefox | 3/14/2023 | Edge | 7/21/2023 | 129 | 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 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.scroll-timeline-axis.inline 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.scroll-timeline-axis.x 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.scroll-timeline-axis.y 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.scroll-timeline-name 📋 | Firefox | 3/14/2023 | Edge | 7/21/2023 | 129 | 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.text-decoration-line.grammar-error 📋 | Edge | 1/25/2024 | 920 | |||
| css.properties.text-decoration-line.spelling-error 📋 | Edge | 1/25/2024 | 920 | |||
| css.properties.text-emphasis-position.auto | Firefox | 10/29/2024 | 642 | |||
| css.properties.text-justify.auto 📋 | Firefox | 8/8/2017 | 3281 | |||
| css.properties.text-justify.inter-character 📋 | Firefox | 8/8/2017 | 3281 | |||
| css.properties.text-justify.inter-word 📋 | Firefox | 8/8/2017 | 3281 | |||
| css.properties.text-justify.none 📋 | Firefox | 8/8/2017 | 3281 | |||
| css.properties.text-size-adjust 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.text-size-adjust.auto 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.text-size-adjust.none 📋 | Edge | 1/15/2020 | 2391 | |||
| css.properties.text-size-adjust.percentages 📋 | Edge | 7/29/2015 | 4022 | |||
| css.properties.text-spacing-trim 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.text-spacing-trim.normal 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.text-spacing-trim.space-all 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.text-spacing-trim.space-first 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.text-spacing-trim.trim-start 📋 | Edge | 3/22/2024 | 863 | |||
| css.properties.text-wrap-style.pretty 📋 | Edge | 10/17/2024 | 654 | |||
| css.properties.timeline-scope 📋 | Edge | 8/21/2023 | 1077 | |||
| css.properties.timeline-scope.all 📋 | Edge | 8/21/2023 | 1077 | |||
| css.properties.timeline-scope.none 📋 | Edge | 8/21/2023 | 1077 | |||
| css.properties.top.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.top.anchor-size 📋 | Edge | 1/17/2025 | 562 | |||
| css.properties.view-timeline 📋 | Firefox | 6/6/2023 | Edge | 7/21/2023 | 45 | Firefox: Now supports the x and y values, and also the deprecated horizontal and vertical values. |
| css.properties.view-timeline-axis 📋 | Firefox | 6/6/2023 | Edge | 7/21/2023 | 45 | Firefox: Now supports the x and y values, and also the deprecated horizontal and vertical values. |
| css.properties.view-timeline-axis.block 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-axis.inline 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-axis.x 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-axis.y 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-inset 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-inset.auto 📋 | Edge | 7/21/2023 | 1108 | |||
| css.properties.view-timeline-name 📋 | Firefox | 3/14/2023 | Edge | 7/21/2023 | 129 | |
| css.properties.white-space.shorthand_values | Edge | 6/2/2023 | 1157 | 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.white-space-collapse.preserve-spaces 📋 | Firefox | 3/19/2024 | 866 | |||
| css.properties.width.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.properties.width.fit-content_function 📋 | Firefox | 8/10/2021 | 1818 | |||
| css.properties.word-break.auto-phrase 📋 | Edge | 11/2/2023 | 1004 | 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-first-node | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-moz-focus-inner | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-moz-last-node | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-moz-list-bullet | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-moz-list-number | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-moz-progress-bar | Firefox | 1/7/2020 | 2399 | |||
| css.selectors.-webkit-slider-runnable-track | Edge | 5/21/2020 | 2264 | |||
| css.selectors.-webkit-slider-thumb | Edge | 5/21/2020 | 2264 | |||
| css.selectors.active-view-transition-type 📋 | Edge | 5/17/2024 | 807 | |||
| css.selectors.details-content 📋 | Edge | 11/14/2024 | 626 | |||
| css.selectors.open 📋 | Edge | 2/6/2025 | 542 | 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 📋 | Edge | 5/21/2020 | 2264 | |||
| css.types.anchor 📋 | Edge | 5/17/2024 | 807 | |||
| css.types.anchor-size 📋 | Edge | 5/17/2024 | 807 | |||
| css.types.anchor-size.inset_margin | Edge | 1/17/2025 | 562 | |||
| css.types.attr.type-or-unit | Edge | 2/6/2025 | 542 | |||
| css.types.calc-size 📋 | Edge | 9/19/2024 | 682 | |||
| css.types.color.system-color.mark_marktext_buttonborder 📋 | Firefox | 1/17/2023 | 1293 | |||
| css.types.image.element 📋 | Firefox | 11/14/2017 | 3183 | 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.ratio.number_value | Firefox | 6/30/2020 | 2224 |