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.container.anchor_position_queries 📋 | Edge | 12/5/2025 | 104 | |||
| css.at-rules.container.anchor_position_queries.fallback 📋 | Edge | 12/5/2025 | 104 | |||
| css.at-rules.container.anchor_position_queries.fallback.any_value 📋 | Edge | 12/5/2025 | 104 | |||
| css.at-rules.container.scroll-state_queries 📋 | Edge | 2/6/2025 | 406 | |||
| css.at-rules.container.scroll-state_queries.scrollable 📋 | Edge | 2/6/2025 | 406 | |||
| css.at-rules.container.scroll-state_queries.scrolled 📋 | Edge | 1/21/2026 | 57 | |||
| css.at-rules.container.scroll-state_queries.snapped 📋 | Edge | 2/6/2025 | 406 | |||
| css.at-rules.container.scroll-state_queries.stuck 📋 | Edge | 2/6/2025 | 406 | |||
| css.at-rules.container.style_queries_for_custom_properties.range_syntax 📋 | Edge | 10/31/2025 | 139 | |||
| css.at-rules.custom-media 📋 | Firefox | 2/24/2026 | 23 | |||
| css.at-rules.function 📋 | Edge | 8/7/2025 | 224 | |||
| css.at-rules.function.result 📋 | Edge | 8/7/2025 | 224 | |||
| css.at-rules.media.device-posture 📋 | Edge | 1/17/2025 | 426 | |||
| css.at-rules.media.display-mode.picture-in-picture 📋 | Edge | 3/22/2024 | 727 | |||
| css.at-rules.media.display-mode.window-controls-overlay 📋 | Edge | 9/1/2022 | 1295 | |||
| css.at-rules.media.horizontal-viewport-segments 📋 | Edge | 6/26/2025 | 266 | |||
| css.at-rules.media.prefers-reduced-data 📋 | Edge | 8/27/2020 | 2030 | |||
| css.at-rules.media.prefers-reduced-transparency 📋 | Firefox | 5/9/2023 | Edge | 10/13/2023 | 157 | |
| css.at-rules.media.vertical-viewport-segments 📋 | Edge | 6/26/2025 | 266 | |||
| css.at-rules.page.bottom-center 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.bottom-left 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.bottom-left-corner 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.bottom-right 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.bottom-right-corner 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.left-bottom 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.left-middle 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.left-top 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.right-bottom 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.right-middle 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.right-top 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.top-center 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.top-left 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.top-left-corner 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.top-right 📋 | Edge | 11/14/2024 | 490 | |||
| css.at-rules.page.top-right-corner 📋 | Edge | 11/14/2024 | 490 | |||
| css.properties.-webkit-app-region | Edge | 1/15/2020 | 2255 | |||
| css.properties.animation-trigger 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.animation-trigger.none 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.appearance.base-select 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.background-image.element 📋 | Firefox | 3/22/2011 | 5476 | |||
| css.properties.block-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.block-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.break-after.always | Firefox | 1/29/2019 | 2606 | |||
| css.properties.break-before.always | Firefox | 1/29/2019 | 2606 | |||
| css.properties.caret-animation 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.caret-animation.auto 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.caret-animation.manual 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.caret-shape 📋 | Edge | 1/21/2026 | 57 | |||
| css.properties.caret-shape.auto 📋 | Edge | 1/21/2026 | 57 | |||
| css.properties.caret-shape.bar 📋 | Edge | 1/21/2026 | 57 | |||
| css.properties.caret-shape.block 📋 | Edge | 1/21/2026 | 57 | |||
| css.properties.caret-shape.underscore 📋 | Edge | 1/21/2026 | 57 | |||
| css.properties.column-height 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.column-height.auto 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.column-wrap 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.column-wrap.auto 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.column-wrap.nowrap 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.column-wrap.wrap 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.columns.column-height 📋 | Edge | 2/14/2026 | 33 | |||
| css.properties.container-type.anchored 📋 | Edge | 12/5/2025 | 104 | |||
| css.properties.container-type.scroll-state 📋 | Edge | 2/6/2025 | 406 | |||
| css.properties.content.alt_text.counters | Edge | 9/5/2025 | 195 | 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 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.corner-block-end-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-end-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-block-start-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-left-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-right-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-bottom-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-end-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-end-start-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-end-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-inline-start-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-left-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-right-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-end-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-start-start-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-left-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-right-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.corner-top-shape.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.properties.counter-reset.reset_does_not_affect_siblings | Firefox | 10/20/2020 | 1976 | |||
| css.properties.counter-reset.reversed 📋 | Firefox | 1/11/2022 | 1528 | |||
| css.properties.display.math | Edge | 1/12/2023 | 1162 | |||
| css.properties.dynamic-range-limit.constrained 📋 | Edge | 5/1/2025 | 322 | |||
| css.properties.dynamic-range-limit.dynamic-range-limit-mix_values 📋 | Edge | 5/1/2025 | 322 | |||
| css.properties.flex.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.flex-basis.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.font-palette.animation_computed | Edge | 1/25/2024 | 784 | |||
| css.properties.font-palette.palette-mix_function 📋 | Edge | 1/25/2024 | 784 | |||
| css.properties.font-synthesis-position 📋 | Firefox | 9/26/2023 | 905 | |||
| css.properties.font-synthesis-position.auto 📋 | Firefox | 9/26/2023 | 905 | |||
| css.properties.font-synthesis-position.none 📋 | Firefox | 9/26/2023 | 905 | |||
| css.properties.font-synthesis-style.oblique-only 📋 | Firefox | 4/1/2025 | 352 | |||
| css.properties.forced-color-adjust.preserve-parent-color 📋 | Edge | 10/3/2022 | 1263 | |||
| css.properties.grid-template-columns.masonry 📋 | Firefox | 6/2/2020 | 2116 | |||
| css.properties.grid-template-rows.masonry 📋 | Firefox | 6/2/2020 | 2116 | |||
| css.properties.height.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.image-rendering.smooth 📋 | Firefox | 10/5/2021 | 1626 | |||
| css.properties.inline-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.inline-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.interactivity 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.interactivity.auto 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.interactivity.inert 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.interest-delay 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interest-delay.normal 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interest-delay-end 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interest-delay-end.normal 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interest-delay-start 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interest-delay-start.normal 📋 | Edge | 10/31/2025 | 139 | |||
| css.properties.interpolate-size 📋 | Edge | 9/19/2024 | 546 | |||
| css.properties.interpolate-size.allow-keywords 📋 | Edge | 9/19/2024 | 546 | |||
| css.properties.interpolate-size.numeric-only 📋 | Edge | 9/19/2024 | 546 | |||
| css.properties.justify-items.block_context 📋 | Edge | 10/17/2024 | 518 | |||
| css.properties.justify-self.block_context 📋 | Edge | 10/17/2024 | 518 | |||
| css.properties.max-block-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.max-block-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.max-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.max-inline-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.max-inline-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.max-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.min-block-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.min-block-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.min-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.min-inline-size.fit-content_function | Firefox | 8/10/2021 | 1682 | |||
| css.properties.min-inline-size.stretch 📋 | Edge | 6/26/2025 | 266 | |||
| css.properties.min-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.object-view-box 📋 | Edge | 8/5/2022 | 1322 | |||
| css.properties.object-view-box.none 📋 | Edge | 8/5/2022 | 1322 | |||
| css.properties.overlay 📋 | Edge | 9/15/2023 | 916 | |||
| css.properties.overlay.auto 📋 | Edge | 9/15/2023 | 916 | |||
| css.properties.overlay.none 📋 | Edge | 9/15/2023 | 916 | |||
| css.properties.reading-flow 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.flex-flow 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.flex-visual 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.grid-columns 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.grid-order 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.grid-rows 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.normal 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-flow.source-order 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.reading-order 📋 | Edge | 5/29/2025 | 294 | |||
| css.properties.ruby-position.alternate | Firefox | 4/19/2021 | 1795 | |||
| css.properties.scroll-initial-target 📋 | Edge | 2/6/2025 | 406 | |||
| css.properties.scroll-initial-target.nearest 📋 | Edge | 2/6/2025 | 406 | |||
| css.properties.scroll-initial-target.none 📋 | Edge | 2/6/2025 | 406 | |||
| css.properties.scroll-marker-group 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.scroll-marker-group.after 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.scroll-marker-group.before 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.scroll-marker-group.none 📋 | Edge | 4/4/2025 | 349 | |||
| css.properties.scroll-target-group 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.scroll-target-group.auto 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.scroll-target-group.none 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.text-autospace.insert 📋 | Firefox | 11/11/2025 | 128 | |||
| css.properties.text-decoration-inset 📋 | Firefox | 12/9/2025 | 100 | |||
| css.properties.text-decoration-inset.auto 📋 | Firefox | 12/9/2025 | 100 | |||
| css.properties.text-emphasis-position.auto | Firefox | 10/29/2024 | 506 | |||
| css.properties.text-size-adjust 📋 | Edge | 1/15/2020 | 2255 | |||
| css.properties.text-size-adjust.auto 📋 | Edge | 1/15/2020 | 2255 | |||
| css.properties.text-size-adjust.none 📋 | Edge | 1/15/2020 | 2255 | |||
| css.properties.text-size-adjust.percentages 📋 | Edge | 7/29/2015 | 3886 | |||
| css.properties.text-spacing-trim 📋 | Edge | 3/22/2024 | 727 | |||
| css.properties.text-spacing-trim.normal 📋 | Edge | 3/22/2024 | 727 | |||
| css.properties.text-spacing-trim.space-all 📋 | Edge | 3/22/2024 | 727 | |||
| css.properties.text-spacing-trim.space-first 📋 | Edge | 3/22/2024 | 727 | |||
| css.properties.text-spacing-trim.trim-start 📋 | Edge | 3/22/2024 | 727 | |||
| css.properties.timeline-trigger 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger.auto 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger.none 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger.normal 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger-name 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger-name.none 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger-source 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger-source.auto 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.timeline-trigger-source.none 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.trigger-scope 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.trigger-scope.all 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.trigger-scope.none 📋 | Edge | 3/12/2026 | 7 | |||
| css.properties.view-transition-group 📋 | Edge | 9/5/2025 | 195 | |||
| css.properties.view-transition-group.contain | Edge | 9/5/2025 | 195 | |||
| css.properties.view-transition-group.nearest | Edge | 9/5/2025 | 195 | |||
| css.properties.view-transition-group.normal | Edge | 9/5/2025 | 195 | |||
| css.properties.white-space.preserve-spaces 📋 | Firefox | 3/19/2024 | 730 | |||
| css.properties.white-space-collapse.preserve-spaces 📋 | Firefox | 3/19/2024 | 730 | |||
| css.properties.width.fit-content_function 📋 | Firefox | 8/10/2021 | 1682 | |||
| css.properties.word-break.auto-phrase 📋 | Edge | 11/2/2023 | 868 | 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 | 8/8/2017 | 3145 | |||
| css.selectors.-moz-last-node | Firefox | 8/8/2017 | 3145 | |||
| css.selectors.-moz-list-bullet | Firefox | 11/9/2004 | 7800 | |||
| css.selectors.-moz-list-number | Firefox | 11/9/2004 | 7800 | |||
| css.selectors.-moz-progress-bar | Firefox | 8/16/2011 | 5329 | |||
| css.selectors.checkmark 📋 | Edge | 2/6/2025 | 406 | |||
| css.selectors.column 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.column.nested_scroll-marker | Edge | 4/4/2025 | 349 | |||
| css.selectors.interest-source 📋 | Edge | 10/31/2025 | 139 | |||
| css.selectors.interest-target 📋 | Edge | 10/31/2025 | 139 | |||
| css.selectors.marker.counter_support 📋 | Firefox | 1/13/2026 | 65 | |||
| css.selectors.marker.quotes_support 📋 | Firefox | 1/13/2026 | 65 | |||
| css.selectors.picker 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.picker-icon 📋 | Edge | 2/6/2025 | 406 | |||
| css.selectors.scroll-button 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.block-end 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.block-start 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.down 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.inline-end 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.inline-start 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.left 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.right 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.star 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-button.up 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-marker 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.scroll-marker-group 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.search-text 📋 | Edge | 1/21/2026 | 57 | |||
| css.selectors.target-after 📋 | Edge | 10/31/2025 | 139 | |||
| css.selectors.target-before 📋 | Edge | 10/31/2025 | 139 | |||
| css.selectors.target-current 📋 | Edge | 4/4/2025 | 349 | |||
| css.selectors.view-transition-group-children 📋 | Edge | 9/5/2025 | 195 | |||
| css.selectors.xr-overlay 📋 | Edge | 5/21/2020 | 2128 | |||
| css.types.attr.type_function 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.angle 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.color 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.custom-ident 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.ident 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.image 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.integer 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.length 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.length-percentage 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.number 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.percentage 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.resolution 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.string 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.time 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.transform-function 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.attr.type_function.url 📋 | Edge | 2/6/2025 | 406 | |||
| css.types.calc-size 📋 | Edge | 9/19/2024 | 546 | |||
| css.types.corner-shape-value 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.bevel 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.notch 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.round 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.scoop 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.square 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.squircle 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.corner-shape-value.superellipse 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.dashed-function 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.dynamic-range-limit-mix 📋 | Edge | 5/1/2025 | 322 | |||
| css.types.env.keyboard-inset-bottom 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.keyboard-inset-height 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.keyboard-inset-left 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.keyboard-inset-right 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.keyboard-inset-top 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.keyboard-inset-width 📋 | Edge | 9/24/2021 | 1637 | |||
| css.types.env.viewport-segment-bottom 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.env.viewport-segment-height 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.env.viewport-segment-left 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.env.viewport-segment-right 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.env.viewport-segment-top 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.env.viewport-segment-width 📋 | Edge | 6/26/2025 | 266 | |||
| css.types.if 📋 | Edge | 5/29/2025 | 294 | |||
| css.types.if.style | Edge | 5/29/2025 | 294 | |||
| css.types.if.style.range_syntax 📋 | Edge | 10/31/2025 | 139 | |||
| css.types.image.element 📋 | Firefox | 11/14/2017 | 3047 | 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 | 2088 | |||
| css.types.superellipse 📋 | Edge | 8/7/2025 | 224 | |||
| css.types.type 📋 | Edge | 8/7/2025 | 224 |