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 Safari and Safari on iOS
| API | First Browser | Date | Last Browser | Date | Days in experimentation | Notes |
|---|---|---|---|---|---|---|
| css.at-rules.font-face.font-width 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.-webkit-column-axis | Safari | 7/25/2012 | Safari on iOS | 9/10/2012 | 47 | |
| css.properties.-webkit-column-progression | Safari on iOS | 9/18/2013 | Safari | 10/22/2013 | 34 | |
| css.properties.-webkit-cursor-visibility | Safari on iOS | 9/18/2013 | Safari | 10/22/2013 | 34 | |
| css.properties.-webkit-hyphenate-limit-after | Safari | 7/20/2011 | Safari on iOS | 10/12/2011 | 84 | |
| css.properties.-webkit-hyphenate-limit-before | Safari | 7/20/2011 | Safari on iOS | 10/12/2011 | 84 | |
| css.properties.-webkit-hyphenate-limit-lines | Safari | 7/25/2012 | Safari on iOS | 9/10/2012 | 47 | |
| css.properties.-webkit-line-align | Safari | 7/25/2012 | Safari on iOS | 9/10/2012 | 47 | |
| css.properties.-webkit-line-box-contain | Safari | 7/20/2011 | Safari on iOS | 10/12/2011 | 84 | |
| css.properties.-webkit-line-grid | Safari | 7/25/2012 | Safari on iOS | 9/10/2012 | 47 | |
| css.properties.-webkit-line-snap | Safari | 7/25/2012 | Safari on iOS | 9/10/2012 | 47 | |
| css.properties.-webkit-mask-source-type | Safari on iOS | 9/18/2013 | Safari | 10/22/2013 | 34 | |
| css.properties.-webkit-nbsp-mode | Safari | 6/8/2009 | Safari on iOS | 4/3/2010 | 299 | |
| css.properties.-webkit-text-zoom | Safari on iOS | 9/13/2016 | Safari | 9/20/2016 | 7 | |
| css.properties.background.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position-x.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position-x.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position-y.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.background-position-y.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.font-width 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.condensed 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.expanded 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.extra-condensed 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.extra-expanded 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.normal 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.percentage 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.semi-condensed 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.semi-expanded 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.ultra-condensed 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.font-width.ultra-expanded 📋 | Safari | 3/31/2025 | 353 | |||
| css.properties.margin-trim 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.block 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.block-end 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.block-start 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.inline 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.inline-end 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.inline-start 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.margin-trim.none 📋 | Safari | 3/27/2023 | Safari on iOS | 3/27/2023 | 0 | |
| css.properties.mask.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask-position.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask-position.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask-position.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mask-position.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.mix-blend-mode.plus-darker 📋 | Safari on iOS | 9/16/2015 | Safari | 9/30/2015 | 14 | |
| css.properties.object-position.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.object-position.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.object-position.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.object-position.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset.margin-box 📋 | Safari | 9/12/2022 | Safari on iOS | 9/12/2022 | 0 | |
| css.properties.offset.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-anchor.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-anchor.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-anchor.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-anchor.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-path.margin-box 📋 | Safari | 9/16/2024 | Safari on iOS | 9/16/2024 | 0 | |
| css.properties.offset-position.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-position.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-position.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.offset-position.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.perspective-origin.x-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.perspective-origin.x-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.perspective-origin.y-end 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.perspective-origin.y-start 📋 | Safari | 9/15/2025 | Safari on iOS | 9/15/2025 | 0 | |
| css.properties.speak-as 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.speak-as.digits 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.speak-as.literal-punctuation 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.speak-as.no-punctuation 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.speak-as.normal 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.speak-as.spell-out 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.stroke-color 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.stroke-color.currentColor 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.stroke-color.transparent 📋 | Safari on iOS | 3/29/2018 | Safari | 4/12/2018 | 14 | |
| css.properties.text-align-last.match-parent 📋 | Safari | 9/12/2022 | Safari on iOS | 9/12/2022 | 0 | |
| css.properties.text-box.cap 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box.ex 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box.ideographic 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box.ideographic-ink 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box-edge.cap 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box-edge.ex 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box-edge.ideographic 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-box-edge.ideographic-ink 📋 | Safari | 12/11/2024 | Safari on iOS | 12/11/2024 | 0 | |
| css.properties.text-decoration-skip 📋 | Safari | 3/25/2019 | Safari on iOS | 3/25/2019 | 0 | Chrome: Only supported the deprecated ink value.Chrome Android: Only supported the deprecated ink value.Opera: Only supported the deprecated ink value.Opera Android: Only supported the deprecated ink value.Samsung Internet: Only supported the deprecated ink value.WebView Android: Only supported the deprecated ink value. |
| css.properties.text-decoration-skip.auto 📋 | Safari on iOS | 9/18/2013 | Safari | 10/22/2013 | 34 | |
| css.properties.text-decoration-skip.none 📋 | Safari on iOS | 9/18/2013 | Safari | 10/22/2013 | 34 | |
| css.properties.text-size-adjust 📋 | Safari on iOS | 6/29/2007 | 6838 | |||
| css.types.random 📋 | Safari | 12/12/2025 | Safari on iOS | 12/12/2025 | 0 | |
| css.types.random.dashed-ident 📋 | Safari | 12/12/2025 | Safari on iOS | 12/12/2025 | 0 | |
| css.types.random.element-shared 📋 | Safari | 12/12/2025 | Safari on iOS | 12/12/2025 | 0 | |
| css.types.random.step 📋 | Safari | 12/12/2025 | Safari on iOS | 12/12/2025 | 0 |