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 Firefox and Safari on iOS
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| css.at-rules.media.prefers-reduced-transparency 📋 | Firefox | 5/9/2023 | 1253 | |||
| css.properties.-webkit-column-axis | Safari on iOS | 9/10/2012 | 5146 | |||
| css.properties.-webkit-column-progression | Safari on iOS | 9/18/2013 | 4773 | |||
| css.properties.-webkit-cursor-visibility | Safari on iOS | 9/18/2013 | 4773 | |||
| css.properties.-webkit-hyphenate-limit-after | Safari on iOS | 10/12/2011 | 5480 | |||
| css.properties.-webkit-hyphenate-limit-before | Safari on iOS | 10/12/2011 | 5480 | |||
| css.properties.-webkit-hyphenate-limit-lines | Safari on iOS | 9/10/2012 | 5146 | |||
| css.properties.-webkit-line-align | Safari on iOS | 9/10/2012 | 5146 | |||
| css.properties.-webkit-line-box-contain | Safari on iOS | 10/12/2011 | 5480 | |||
| css.properties.-webkit-line-grid | Safari on iOS | 9/10/2012 | 5146 | |||
| css.properties.-webkit-line-snap | Safari on iOS | 9/10/2012 | 5146 | |||
| css.properties.-webkit-mask-source-type | Safari on iOS | 9/18/2013 | 4773 | |||
| css.properties.-webkit-nbsp-mode | Safari on iOS | 4/3/2010 | 6037 | |||
| css.properties.-webkit-text-zoom | Safari on iOS | 9/13/2016 | 3682 | |||
| css.properties.animation-timeline 📋 | Firefox | 2/14/2023 | 1337 | |||
| css.properties.animation-timeline.scroll 📋 | Firefox | 2/14/2023 | 1337 | 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 | 1225 | |||
| css.properties.background-image.element 📋 | Firefox | 3/22/2011 | 5684 | |||
| css.properties.block-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.break-after.always | Firefox | 1/7/2020 | 2471 | |||
| css.properties.break-before.always | Firefox | 1/7/2020 | 2471 | |||
| css.properties.content.none_applies_to_elements | Firefox | 8/10/2021 | 1890 | |||
| css.properties.counter-reset.reset_does_not_affect_siblings | Firefox | 10/20/2020 | 2184 | |||
| css.properties.counter-reset.reversed 📋 | Firefox | 1/11/2022 | 1736 | |||
| css.properties.font-synthesis-position 📋 | Firefox | 9/26/2023 | 1113 | |||
| css.properties.font-synthesis-position.auto 📋 | Firefox | 9/26/2023 | 1113 | |||
| css.properties.font-synthesis-position.none 📋 | Firefox | 9/26/2023 | 1113 | |||
| css.properties.grid-template-columns.masonry 📋 | Firefox | 6/2/2020 | 2324 | |||
| css.properties.grid-template-rows.masonry 📋 | Firefox | 6/2/2020 | 2324 | |||
| css.properties.height.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.properties.image-rendering.smooth 📋 | Firefox | 10/5/2021 | 1834 | |||
| css.properties.inline-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.margin-trim 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.block 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.block-end 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.block-start 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.inline 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.inline-end 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.inline-start 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.margin-trim.none 📋 | Safari on iOS | 3/27/2023 | 1296 | |||
| css.properties.max-block-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.max-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.properties.max-inline-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.max-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.properties.min-block-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.min-height.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.properties.min-height.stretch | Safari on iOS | 9/16/2015 | 4045 | |||
| css.properties.min-inline-size.fit-content_function | Firefox | 8/10/2021 | 1890 | |||
| css.properties.min-width.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.properties.mix-blend-mode.plus-darker 📋 | Safari on iOS | 3/24/2020 | 2394 | |||
| css.properties.offset-path.margin-box 📋 | Safari on iOS | 9/16/2024 | 757 | |||
| css.properties.overflow-block.overlay | Firefox | 4/11/2023 | 1281 | |||
| css.properties.overflow-inline.overlay | Firefox | 4/11/2023 | 1281 | |||
| css.properties.ruby-position.alternate | Firefox | 4/19/2021 | 2003 | |||
| css.properties.scroll-timeline 📋 | Firefox | 3/14/2023 | 1309 | 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 | 1309 | 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-name 📋 | Firefox | 3/14/2023 | 1309 | 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 on iOS | 3/29/2018 | 3120 | |||
| css.properties.speak-as.digits 📋 | Safari on iOS | 3/29/2018 | 3120 | |||
| css.properties.speak-as.literal-punctuation 📋 | Safari on iOS | 3/29/2018 | 3120 | |||
| css.properties.speak-as.no-punctuation 📋 | Safari on iOS | 3/29/2018 | 3120 | |||
| css.properties.speak-as.normal 📋 | Safari on iOS | 3/29/2018 | 3120 | |||
| css.properties.speak-as.spell-out 📋 | Safari on iOS | 3/29/2018 | 3120 | |||
| css.properties.stroke-color 📋 | Safari on iOS | 3/24/2020 | 2394 | |||
| css.properties.text-decoration-skip 📋 | Safari on iOS | 3/25/2019 | 2759 | 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 on iOS | 3/24/2020 | 2394 | |||
| css.properties.text-decoration-skip.none 📋 | Safari on iOS | 3/24/2020 | 2394 | |||
| css.properties.text-emphasis-position.auto | Firefox | 10/29/2024 | 714 | |||
| css.properties.text-justify.auto 📋 | Firefox | 8/8/2017 | 3353 | |||
| css.properties.text-justify.inter-character 📋 | Firefox | 8/8/2017 | 3353 | |||
| css.properties.text-justify.inter-word 📋 | Firefox | 8/8/2017 | 3353 | |||
| css.properties.text-justify.none 📋 | Firefox | 8/8/2017 | 3353 | |||
| css.properties.text-size-adjust 📋 | Safari on iOS | 6/29/2007 | 7046 | |||
| css.properties.view-timeline 📋 | Firefox | 6/6/2023 | 1225 | 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 | 1225 | Firefox: Now supports the x and y values, and also the deprecated horizontal and vertical values. | ||
| css.properties.view-timeline-name 📋 | Firefox | 3/14/2023 | 1309 | |||
| css.properties.white-space-collapse.preserve-spaces 📋 | Firefox | 3/19/2024 | 938 | |||
| css.properties.width.fit-content_function 📋 | Firefox | 8/10/2021 | 1890 | |||
| css.selectors.-moz-first-node | Firefox | 1/7/2020 | 2471 | |||
| css.selectors.-moz-focus-inner | Firefox | 1/7/2020 | 2471 | |||
| css.selectors.-moz-last-node | Firefox | 1/7/2020 | 2471 | |||
| css.selectors.-moz-list-bullet | Firefox | 1/7/2020 | 2471 | |||
| css.selectors.-moz-list-number | Firefox | 1/7/2020 | 2471 | |||
| css.selectors.-moz-progress-bar | Firefox | 1/7/2020 | 2471 | |||
| css.types.color.system-color.mark_marktext_buttonborder 📋 | Firefox | 1/17/2023 | 1365 | |||
| css.types.image.element 📋 | Firefox | 11/14/2017 | 3255 | 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 | 2296 |
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| html.elements.a.attributionsourceid 📋 | Safari on iOS | 4/26/2021 | 1996 | |||
| html.elements.iframe.allow.document-domain 📋 | Firefox | 3/10/2020 | 2408 | |||
| html.elements.iframe.allow.gamepad 📋 | Firefox | 8/10/2021 | 1890 | 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.speaker-selection 📋 | Firefox | 8/1/2023 | 1169 | Firefox for Android: Not available due to a limitation in Android (see bug 1473346). | ||
| html.global_attributes.autocorrect 📋 | Safari on iOS | 4/26/2021 | 1996 | 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. |