Now Stable

"New on the Web": For a given set of browsers, what APIs became stable and when, ordered reverse chronologically.

It's a great source of information for posts like this

Example Comparisons

Stable APIs

Below is a list of features that are in Firefox and Safari, ordered reverse chronologically by when they became stable (i.e, available in the last browser).

2024/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.page 📋	Firefox	2/19/2013	Safari	12/11/2024	4313
css.at-rules.page.size 📋	Firefox	12/7/2021	Safari	12/11/2024	1100
css.at-rules.page.size.jis-b4 📋	Firefox	12/7/2021	Safari	12/11/2024	1100
css.at-rules.page.size.jis-b5 📋	Firefox	12/7/2021	Safari	12/11/2024	1100
css.properties.line-clamp 📋	Firefox	7/9/2019	Safari	12/11/2024	1982
css.properties.line-clamp.none	Firefox	7/9/2019	Safari	12/11/2024	1982
css.properties.ruby-align 📋	Firefox	5/12/2015	Safari	12/11/2024	3501	Internet Explorer: Internet Explorer 9 and later supports an earlier draft of CSS Ruby with non-standard values for this property: `auto`, `left`, `center`, `right`, `distribute-letter`, `distribute-space`, and `line-edge`.
css.properties.ruby-align.center 📋	Firefox	5/12/2015	Safari	12/11/2024	3501
css.properties.ruby-align.space-around 📋	Firefox	5/12/2015	Safari	12/11/2024	3501
css.properties.ruby-align.space-between 📋	Firefox	5/12/2015	Safari	12/11/2024	3501
css.properties.ruby-align.start 📋	Firefox	5/12/2015	Safari	12/11/2024	3501
css.properties.ruby-position 📋	Firefox	5/12/2015	Safari	12/11/2024	3501	Chrome: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Chrome Android: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Edge: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Internet Explorer: Internet Explorer 9 and later support an old draft values: `inline` (equivalent of having `display: inline` on the ruby), and `above` (synonym of the modern `over`).Quest Browser: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Opera: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Opera Android: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Safari: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).Safari on iOS: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).WebView Android: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).WebView on iOS: Implemented as a non-standard, prefixed, version of `ruby-position`, `-webkit-ruby-position`: it has two properties: `before` and `after` (both equivalent, for ltr and rtl scripts to the standard `over` value used with `ruby-align: start`).
css.properties.ruby-position.over	Firefox	1/7/2020	Safari	12/11/2024	1800
css.properties.ruby-position.under	Firefox	1/7/2020	Safari	12/11/2024	1800
css.properties.scrollbar-gutter 📋	Firefox	2/8/2022	Safari	12/11/2024	1037
css.properties.scrollbar-gutter.auto 📋	Firefox	2/8/2022	Safari	12/11/2024	1037
css.properties.scrollbar-gutter.stable 📋	Firefox	2/8/2022	Safari	12/11/2024	1037
css.properties.scrollbar-width 📋	Firefox	12/11/2018	Safari	12/11/2024	2192
css.properties.scrollbar-width.auto 📋	Firefox	12/11/2018	Safari	12/11/2024	2192
css.properties.scrollbar-width.none 📋	Firefox	12/11/2018	Safari	12/11/2024	2192
css.properties.scrollbar-width.thin 📋	Firefox	12/11/2018	Safari	12/11/2024	2192
css.properties.text-underline-offset.percentage 📋	Firefox	3/10/2020	Safari	12/11/2024	1737
css.properties.text-underline-position.left	Firefox	3/10/2020	Safari	12/11/2024	1737
css.properties.text-underline-position.right	Firefox	3/10/2020	Safari	12/11/2024	1737
css.selectors.target-text 📋	Firefox	10/1/2024	Safari	12/11/2024	71

2024/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.backdrop-filter 📋	Firefox	7/26/2022	Safari	9/16/2024	783
css.properties.content-visibility 📋	Firefox	4/16/2024	Safari	9/16/2024	153
css.properties.content-visibility.auto 📋	Firefox	4/16/2024	Safari	9/16/2024	153	Safari: Skipped content is not findable via find-in-page.Safari on iOS: Skipped content is not findable via find-in-page.WebView on iOS: Skipped content is not findable via find-in-page.
css.properties.content-visibility.hidden 📋	Firefox	4/16/2024	Safari	9/16/2024	153
css.properties.content-visibility.visible 📋	Firefox	4/16/2024	Safari	9/16/2024	153
css.properties.offset-path.basic_shape 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.border-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.content-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.fill-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.none 📋	Firefox	1/7/2020	Safari	9/16/2024	1714
css.properties.offset-path.padding-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.stroke-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.properties.offset-path.view-box 📋	Firefox	1/23/2024	Safari	9/16/2024	237
css.types.color.color.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Safari: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified as percentages with units (`%`).Safari on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified as percentages with units (`%`).WebView on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified as percentages with units (`%`).
css.types.color.hsl.mixed_type_parameters	Firefox	1/23/2024	Safari	9/16/2024	237
css.types.color.hsl.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Chrome: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Chrome Android: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Edge: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Opera: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Opera Android: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Safari: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `s` and `l`).Safari on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `s` and `l`).Samsung Internet: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).WebView Android: `s` and `l` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `s` and `l` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).WebView on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `s` and `l`).
css.types.color.hwb.mixed_type_parameters	Firefox	1/23/2024	Safari	9/16/2024	237
css.types.color.hwb.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Chrome: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Chrome Android: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Edge: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Opera: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Opera Android: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).Safari: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `w` and `b`).Safari on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `w` and `b`).Samsung Internet: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).WebView Android: `w` and `b` channel values incorrectly resolve to numbers between 0-1 rather than 0-100. As a result, channel value calculations require `w` and `b` values to be specified as decimal percentage equivalents (e.g. 0.2 for 20%).WebView on iOS: Implementation based on older spec version. As a result, calculations with channel values do not work correctly, requiring values to be specified with units (`deg` for `h`, `%` for `w` and `b`).
css.types.color.lch.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Safari: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).Safari on iOS: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).WebView on iOS: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).
css.types.color.oklch.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Safari: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).Safari on iOS: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).WebView on iOS: Implementation based on older spec version. As a result, calculations with `h` channel values do not work correctly, requiring values to be specified with units (`deg`).
css.types.color.rgb.mixed_type_parameters	Firefox	5/9/2023	Safari	9/16/2024	496
css.types.color.rgb.relative_syntax 📋	Firefox	7/9/2024	Safari	9/16/2024	69	Chrome: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.Chrome Android: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.Edge: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.Opera: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.Opera Android: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.Safari: Implementation based on older spec version. As a result, channel value calculations do not work correctly, requiring values to be specified as percentages with units (e.g. 30%, which would be equivalent to a 76.5 `<number>` value). See bug 267647.Safari on iOS: Implementation based on older spec version. As a result, channel value calculations do not work correctly, requiring values to be specified as percentages with units (e.g. 30%, which would be equivalent to a 76.5 `<number>` value). See bug 267647.Samsung Internet: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.WebView Android: Channel values incorrectly resolve to numbers between 0-1 rather than 0-255. As a result, channel value calculations require values to be specified as decimal percentage equivalents (e.g. 0.3 for 30%, which would be equivalent to a 76.5 `<number>` value). See bug 41490327.WebView on iOS: Implementation based on older spec version. As a result, channel value calculations do not work correctly, requiring values to be specified as percentages with units (e.g. 30%, which would be equivalent to a 76.5 `<number>` value). See bug 267647.
css.properties.hyphens.language_czech	Safari	3/21/2016	Firefox	9/3/2024	3088

2024/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.starting-style 📋	Safari	5/13/2024	Firefox	8/6/2024	85	Firefox: Does not yet support animating from `display: none`Firefox for Android: Does not yet support animating from `display: none`
css.properties.transition.transition-behavior	Safari	3/5/2024	Firefox	8/6/2024	154
css.properties.transition-behavior 📋	Safari	3/5/2024	Firefox	8/6/2024	154

2024/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.align-content.flex_context.safe_unsafe	Firefox	10/23/2018	Safari	7/29/2024	2106	Chrome: Before version 115, this value is recognized, but has no effect.Chrome Android: Before version 115, this value is recognized, but has no effect.Edge: Before version 115, this value is recognized, but has no effect.Opera: Before version 101, this value is recognized, but has no effect.Opera Android: Before version 77, this value is recognized, but has no effect.Samsung Internet: Before version 23.0, this value is recognized, but has no effect.WebView Android: Before version 115, this value is recognized, but has no effect.
css.properties.align-items.flex_context.safe_unsafe	Firefox	10/23/2018	Safari	7/29/2024	2106	Chrome: Before version 115, this value is recognized, but has no effect.Chrome Android: Before version 115, this value is recognized, but has no effect.Edge: Before version 115, this value is recognized, but has no effect.Opera: Before version 101, this value is recognized, but has no effect.Opera Android: Before version 77, this value is recognized, but has no effect.Samsung Internet: Before version 23.0, this value is recognized, but has no effect.WebView Android: Before version 115, this value is recognized, but has no effect.
css.properties.align-self.flex_context.safe_unsafe	Firefox	10/23/2018	Safari	7/29/2024	2106	Chrome: Before version 115, this value is recognized, but has no effect.Chrome Android: Before version 115, this value is recognized, but has no effect.Edge: Before version 115, this value is recognized, but has no effect.Opera: Before version 101, this value is recognized, but has no effect.Opera Android: Before version 77, this value is recognized, but has no effect.Samsung Internet: Before version 23.0, this value is recognized, but has no effect.WebView Android: Before version 115, this value is recognized, but has no effect.
css.properties.justify-content.flex_context.safe_unsafe	Firefox	10/23/2018	Safari	7/29/2024	2106	Chrome: Before version 115, this value is recognized, but has no effect.Chrome Android: Before version 115, this value is recognized, but has no effect.Edge: Before version 115, this value is recognized, but has no effect.Opera: Before version 101, this value is recognized, but has no effect.Opera Android: Before version 77, this value is recognized, but has no effect.Samsung Internet: Before version 23.0, this value is recognized, but has no effect.WebView Android: Before version 115, this value is recognized, but has no effect.
css.at-rules.property 📋	Safari	3/27/2023	Firefox	7/9/2024	470
css.at-rules.property.inherits 📋	Safari	3/27/2023	Firefox	7/9/2024	470
css.at-rules.property.initial-value 📋	Safari	3/27/2023	Firefox	7/9/2024	470
css.at-rules.property.syntax 📋	Safari	3/27/2023	Firefox	7/9/2024	470
css.at-rules.scope 📋	Safari	3/5/2024	Firefox	7/9/2024	126
css.properties.content.alt_text	Safari	3/5/2024	Firefox	7/9/2024	126
css.types.calc.color_component	Safari	3/27/2023	Firefox	7/9/2024	470
css.types.color.lab.relative_syntax 📋	Safari	3/27/2023	Firefox	7/9/2024	470
css.types.color.oklab.relative_syntax 📋	Safari	3/27/2023	Firefox	7/9/2024	470

2024/6

API	First Browser	Date	Last Browser	Date	Days
css.types.gradient.conic-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.conic-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.linear-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.linear-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.radial-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.radial-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-conic-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-conic-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-linear-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-linear-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-radial-gradient.hue_interpolation_method	Safari	12/13/2022	Firefox	6/11/2024	546
css.types.gradient.repeating-radial-gradient.interpolation_color_space	Safari	12/13/2022	Firefox	6/11/2024	546

2024/5

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.zoom 📋	Safari	3/18/2008	Firefox	5/14/2024	5901
css.selectors.state 📋	Safari	3/5/2024	Firefox	5/14/2024	70	Chrome: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Chrome Android: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Edge: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Quest Browser: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Opera: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Opera Android: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.Samsung Internet: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.WebView Android: Uses a dashed-ident (such as `:--foo`) instead of `:state()`.
css.properties.font-variant-emoji 📋	Firefox	12/13/2022	Safari	5/13/2024	517
css.properties.text-wrap.balance 📋	Firefox	12/19/2023	Safari	5/13/2024	146
css.properties.text-wrap.stable 📋	Firefox	12/19/2023	Safari	5/13/2024	146
css.properties.text-wrap-style 📋	Firefox	3/19/2024	Safari	5/13/2024	55
css.properties.text-wrap-style.auto 📋	Firefox	3/19/2024	Safari	5/13/2024	55
css.properties.text-wrap-style.balance 📋	Firefox	3/19/2024	Safari	5/13/2024	55
css.properties.text-wrap-style.stable 📋	Firefox	3/19/2024	Safari	5/13/2024	55
css.types.color.light-dark 📋	Firefox	11/21/2023	Safari	5/13/2024	174

2024/4

API	First Browser	Date	Last Browser	Date	Days
css.properties.align-content.block_context 📋	Safari	3/5/2024	Firefox	4/16/2024	42
css.properties.transform-box.content-box 📋	Safari	3/24/2020	Firefox	4/16/2024	1484
css.properties.transform-box.stroke-box 📋	Safari	3/24/2020	Firefox	4/16/2024	1484
css.selectors.backdrop.popover	Safari	9/18/2023	Firefox	4/16/2024	211
css.selectors.popover-open 📋	Safari	9/18/2023	Firefox	4/16/2024	211

2024/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.text-wrap.nowrap 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.text-wrap.wrap 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.text-wrap-mode 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.text-wrap-mode.nowrap	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.text-wrap-mode.wrap	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.white-space-collapse 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.white-space-collapse.break-spaces 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.white-space-collapse.collapse 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.white-space-collapse.preserve 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.white-space-collapse.preserve-breaks 📋	Safari	3/5/2024	Firefox	3/19/2024	14
css.properties.text-decoration-thickness.percentage	Firefox	3/10/2020	Safari	3/5/2024	1456
css.properties.text-wrap 📋	Firefox	12/19/2023	Safari	3/5/2024	77
css.properties.writing-mode.vertical_oriented_form_controls	Firefox	11/21/2023	Safari	3/5/2024	105	Chrome: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Chrome: Supported for select, button, textarea and textual input elements.Chrome: Only supported for select and button elements.Chrome Android: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Chrome Android: Supported for select, button, textarea and textual input elements.Chrome Android: Only supported for select and button elements.Edge: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Edge: Supported for select, button, textarea and textual input elements.Edge: Only supported for select and button elements.Opera: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Opera: Supported for select, button, textarea and textual input elements.Opera: Only supported for select and button elements.Opera Android: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Opera Android: Supported for select, button, textarea and textual input elements.Opera Android: Only supported for select and button elements.Safari: Support for range sliders, textual inputs, and textareas onlySafari on iOS: Support for range sliders, textual inputs, and textareas onlySamsung Internet: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.Samsung Internet: Supported for select, button, textarea and textual input elements.Samsung Internet: Only supported for select and button elements.WebView Android: Supported for select, button, textarea, textual input, range slider, meter, and progress elements.WebView Android: Supported for select, button, textarea and textual input elements.WebView Android: Only supported for select and button elements.WebView on iOS: Support for range sliders, textual inputs, and textareas only
css.selectors.backdrop.inherit_from_originating_element	Firefox	11/21/2023	Safari	3/5/2024	105

2024/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.offset-path.ray 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-path.url 📋	Safari	9/18/2023	Firefox	1/23/2024	127
css.properties.offset-position 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.auto 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.bottom 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.center 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.left 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.normal 📋	Safari	12/11/2023	Firefox	1/23/2024	43
css.properties.offset-position.right 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.properties.offset-position.top 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.types.basic-shape.rect 📋	Safari	12/11/2023	Firefox	1/23/2024	43	Chrome: Only supported on the `offset-path` property.Chrome Android: Only supported on the `offset-path` property.Edge: Only supported on the `offset-path` property.Opera: Only supported on the `offset-path` property.Opera Android: Only supported on the `offset-path` property.Samsung Internet: Only supported on the `offset-path` property.WebView Android: Only supported on the `offset-path` property.
css.types.basic-shape.xywh 📋	Safari	12/11/2023	Firefox	1/23/2024	43	Chrome: Only supported on the `offset-path` property.Chrome Android: Only supported on the `offset-path` property.Edge: Only supported on the `offset-path` property.Opera: Only supported on the `offset-path` property.Opera Android: Only supported on the `offset-path` property.Samsung Internet: Only supported on the `offset-path` property.WebView Android: Only supported on the `offset-path` property.
css.types.ray 📋	Safari	9/12/2022	Firefox	1/23/2024	498
css.types.ray.position	Safari	12/11/2023	Firefox	1/23/2024	43
css.types.ray.size	Safari	9/18/2023	Firefox	1/23/2024	127

2023/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.text-indent.each-line 📋	Safari	9/20/2021	Firefox	12/19/2023	820
css.properties.text-indent.hanging 📋	Safari	9/20/2021	Firefox	12/19/2023	820
css.selectors.has 📋	Safari	3/14/2022	Firefox	12/19/2023	645
css.properties.counter-set 📋	Firefox	7/9/2019	Safari	12/11/2023	1616
css.properties.counter-set.list-item 📋	Firefox	7/9/2019	Safari	12/11/2023	1616
css.properties.counter-set.none 📋	Firefox	7/9/2019	Safari	12/11/2023	1616
css.selectors.nesting 📋	Firefox	8/29/2023	Safari	12/11/2023	104	Chrome: Does not support nested rules that start with a type selector.Chrome Android: Does not support nested rules that start with a type selector.Edge: Does not support nested rules that start with a type selector.Opera: Does not support nested rules that start with a type selector.Opera Android: Does not support nested rules that start with a type selector.Safari: Does not support nested rules that start with a type selector.Safari on iOS: Does not support nested rules that start with a type selector.Samsung Internet: Does not support nested rules that start with a type selector.WebView Android: Does not support nested rules that start with a type selector.WebView on iOS: Does not support nested rules that start with a type selector.
css.types.easing-function.linear-function 📋	Firefox	4/11/2023	Safari	12/11/2023	244
css.types.length.cap	Firefox	2/8/2022	Safari	12/11/2023	671

2023/11

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.direction.vertical_slider_direction	Safari	5/18/2023	Firefox	11/21/2023	187	Firefox: Only supported for vertical range sliders.Firefox for Android: Only supported for vertical range sliders.Safari: Only supported for vertical range sliders.Safari on iOS: Only supported for vertical range sliders.WebView on iOS: Only supported for vertical range sliders.
css.types.length.lh 📋	Safari	3/27/2023	Firefox	11/21/2023	239
css.types.length.rlh 📋	Safari	3/27/2023	Firefox	11/21/2023	239

2023/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.font-size-adjust.from-font 📋	Safari	9/18/2023	Firefox	9/26/2023	8
css.types.abs 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.exp 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.hypot 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.log 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.mod 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.pow 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.rem 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.round 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.sign 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.types.sqrt 📋	Safari	3/14/2022	Firefox	9/26/2023	561
css.at-rules.counter-style 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.additive-symbols 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.fallback 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.negative 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.pad 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.prefix 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.range 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.suffix 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.counter-style.symbols 📋	Firefox	10/14/2014	Safari	9/18/2023	3261	Chrome: Does not support `<image>` as a value for the `symbols` descriptor.Chrome Android: Does not support `<image>` as a value for the `symbols` descriptor.Edge: Does not support `<image>` as a value for the `symbols` descriptor.Firefox: Does not support `<image>` as a value for the `symbols` descriptor.Firefox for Android: Does not support `<image>` as a value for the `symbols` descriptor.Quest Browser: Does not support `<image>` as a value for the `symbols` descriptor.Opera: Does not support `<image>` as a value for the `symbols` descriptor.Opera Android: Does not support `<image>` as a value for the `symbols` descriptor.Samsung Internet: Does not support `<image>` as a value for the `symbols` descriptor.WebView Android: Does not support `<image>` as a value for the `symbols` descriptor.
css.at-rules.counter-style.system 📋	Firefox	10/14/2014	Safari	9/18/2023	3261
css.at-rules.font-face.size-adjust 📋	Firefox	9/7/2021	Safari	9/18/2023	741
css.at-rules.font-face.src.tech_keyword	Firefox	11/15/2022	Safari	9/18/2023	307
css.at-rules.media.overflow-block 📋	Firefox	3/19/2019	Safari	9/18/2023	1644
css.at-rules.media.overflow-inline 📋	Firefox	3/19/2019	Safari	9/18/2023	1644
css.at-rules.media.scripting 📋	Firefox	5/9/2023	Safari	9/18/2023	132
css.at-rules.media.update 📋	Firefox	6/28/2022	Safari	9/18/2023	447
css.at-rules.supports.font-format	Firefox	10/18/2022	Safari	9/18/2023	335
css.at-rules.supports.font-tech	Firefox	10/18/2022	Safari	9/18/2023	335
css.properties.background-image.image-set 📋	Firefox	6/1/2021	Safari	9/18/2023	839	Chrome: Support for `url` images only and `x` is the only supported resolution unit.Chrome Android: Support for `url` images only and `x` is the only supported resolution unit.Edge: Support for `url` images only and `x` is the only supported resolution unit.Firefox: The `type()` function is not supported as an argument to `image-set()`.Firefox for Android: The `type()` function is not supported as an argument to `image-set()`.Quest Browser: Support for `url` images only and `x` is the only supported resolution unit.Opera: Support for `url` images only and `x` is the only supported resolution unit.Opera Android: Support for `url` images only and `x` is the only supported resolution unit.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Samsung Internet: Support for `url` images only and `x` is the only supported resolution unit.WebView Android: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.
css.properties.contain-intrinsic-block-size 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-block-size.none 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-height 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-height.none 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-inline-size 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-inline-size.none 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-size 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-size.auto_none	Firefox	8/29/2023	Safari	9/18/2023	20
css.properties.contain-intrinsic-size.none 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-width 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.contain-intrinsic-width.none 📋	Firefox	11/15/2022	Safari	9/18/2023	307
css.properties.content.image-set 📋	Firefox	6/1/2021	Safari	9/18/2023	839	Chrome: Support for `url` images only and `x` is the only supported resolution unit.Chrome Android: Support for `url` images only and `x` is the only supported resolution unit.Edge: Support for `url` images only and `x` is the only supported resolution unit.Firefox: The `type()` function is not supported as an argument to `image-set()`.Firefox for Android: The `type()` function is not supported as an argument to `image-set()`.Quest Browser: Support for `url` images only and `x` is the only supported resolution unit.Opera: Support for `url` images only and `x` is the only supported resolution unit.Opera Android: Support for `url` images only and `x` is the only supported resolution unit.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Samsung Internet: Support for `url` images only and `x` is the only supported resolution unit.WebView Android: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.
css.properties.font-size-adjust.two-values	Firefox	9/7/2021	Safari	9/18/2023	741
css.properties.hyphenate-character 📋	Firefox	3/8/2022	Safari	9/18/2023	559
css.properties.hyphens 📋	Firefox	12/15/2015	Safari	9/18/2023	2834	Edge: Only works if the specified language is the same as the language of the underlying OS.Internet Explorer: Only works if the specified language is the same as the language of the underlying OS.
css.properties.list-style-type.ethiopic-halehame	Firefox	11/9/2004	Safari	9/18/2023	6887
css.properties.list-style-type.ethiopic-halehame-am	Firefox	11/9/2004	Safari	9/18/2023	6887
css.properties.text-transform.full-size-kana 📋	Firefox	12/11/2018	Safari	9/18/2023	1742
css.properties.text-transform.full-width 📋	Firefox	2/19/2013	Safari	9/18/2023	3863
css.types.image.image-set 📋	Firefox	6/1/2021	Safari	9/18/2023	839	Chrome: Support for `url` images only and `x` is the only supported resolution unit.Chrome Android: Support for `url` images only and `x` is the only supported resolution unit.Edge: Support for `url` images only and `x` is the only supported resolution unit.Firefox: The `type()` function is not supported as an argument to `image-set()`.Firefox for Android: The `type()` function is not supported as an argument to `image-set()`.Quest Browser: Support for `url` images only and `x` is the only supported resolution unit.Opera: Support for `url` images only and `x` is the only supported resolution unit.Opera Android: Support for `url` images only and `x` is the only supported resolution unit.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: The `type()` function is not supported as an argument to `image-set()`.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: The `type()` function is not supported as an argument to `image-set()`.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Safari on iOS: Support for `url` images only and `x` is the only supported resolution unit.Samsung Internet: Support for `url` images only and `x` is the only supported resolution unit.WebView Android: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: The `type()` function is not supported as an argument to `image-set()`.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.WebView on iOS: Support for `url` images only and `x` is the only supported resolution unit.

2023/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.math-style 📋	Safari	4/26/2021	Firefox	8/29/2023	855
css.selectors.first 📋	Safari	7/25/2012	Firefox	8/1/2023	4024

2023/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.animation-composition 📋	Safari	9/12/2022	Firefox	7/4/2023	295

2023/6

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.media.inverted-colors 📋	Safari	3/21/2016	Firefox	6/6/2023	2633
css.properties.-webkit-text-security	Safari	10/26/2007	Firefox	6/6/2023	5702
css.selectors.lang.argument_list	Safari	9/30/2015	Firefox	6/6/2023	2806
css.selectors.lang.wildcards	Safari	9/30/2015	Firefox	6/6/2023	2806
css.types.calc-keyword.NaN	Safari	9/12/2022	Firefox	6/6/2023	267
css.types.calc-keyword.infinity	Safari	9/12/2022	Firefox	6/6/2023	267

2023/5

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.user-invalid 📋	Firefox	4/19/2021	Safari	5/18/2023	759
css.selectors.user-valid 📋	Firefox	4/19/2021	Safari	5/18/2023	759
css.types.color.system-color.accentcolor_accentcolortext 📋	Firefox	7/26/2022	Safari	5/18/2023	296	Safari: Only supports a fallback: The native color when accent colour (in macOS' appearance panel) is set to 'multicolour'. On iOS falls back to the blue accent colourSafari on iOS: Only supports a fallback: The native color when accent colour (in macOS' appearance panel) is set to 'multicolour'. On iOS falls back to the blue accent colourWebView on iOS: Only supports a fallback: The native color when accent colour (in macOS' appearance panel) is set to 'multicolour'. On iOS falls back to the blue accent colour
css.properties.content.gradient 📋	Safari	10/22/2013	Firefox	5/9/2023	3486	Firefox: `content: <gradient>` doesn't paint on ::before/::after pseudo elements. See bug 1832901.Firefox for Android: `content: <gradient>` doesn't paint on ::before/::after pseudo elements. See bug 1832901.
css.selectors.nth-child.of_syntax	Safari	9/30/2015	Firefox	5/9/2023	2778
css.selectors.nth-last-child.of_syntax	Safari	9/30/2015	Firefox	5/9/2023	2778
css.types.color.color 📋	Safari	9/20/2021	Firefox	5/9/2023	596	Safari: Only supports `display-p3` and `srgb` predefined color profiles.Safari on iOS: Only supports `display-p3` and `srgb` predefined color profiles.WebView on iOS: Only supports `display-p3` and `srgb` predefined color profiles.
css.types.color.color.mixed_type_parameters	Safari	9/20/2021	Firefox	5/9/2023	596
css.types.color.color-mix 📋	Safari	12/13/2022	Firefox	5/9/2023	147
css.types.color.lab 📋	Safari	9/20/2021	Firefox	5/9/2023	596
css.types.color.lab.mixed_type_parameters	Safari	12/13/2022	Firefox	5/9/2023	147
css.types.color.lch 📋	Safari	9/20/2021	Firefox	5/9/2023	596
css.types.color.lch.mixed_type_parameters	Safari	12/13/2022	Firefox	5/9/2023	147
css.types.color.oklab 📋	Safari	3/14/2022	Firefox	5/9/2023	421
css.types.color.oklab.mixed_type_parameters	Safari	12/13/2022	Firefox	5/9/2023	147
css.types.color.oklch 📋	Safari	3/14/2022	Firefox	5/9/2023	421
css.types.color.oklch.mixed_type_parameters	Safari	12/13/2022	Firefox	5/9/2023	147

2023/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.types.overflow.overlay	Safari	9/17/2018	Firefox	4/11/2023	1667	Chrome: Before version 114, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 114, the keyword aliases to the standard `auto` keyword. See bug 40444262.Chrome Android: Before version 114, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 114, the keyword aliases to the standard `auto` keyword. See bug 40444262.Edge: Before version 114, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 114, the keyword aliases to the standard `auto` keyword. See bug 40444262.Quest Browser: Before version false, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version false, the keyword aliases to the standard `auto` keyword. See bug 40444262.Opera: Before version 100, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 100, the keyword aliases to the standard `auto` keyword. See bug 40444262.Safari: Before version 12, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 12, the keyword aliases to the standard `auto` keyword. See bug 189811.Safari on iOS: Before version 12, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 12, the keyword aliases to the standard `auto` keyword. See bug 189811.WebView Android: Before version 114, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 114, the keyword aliases to the standard `auto` keyword. See bug 40444262.WebView on iOS: Before version 12, the `overlay` keyword caused non-standard behavior, allowing scrollbars to overlay content without taking up layout space. From version 12, the keyword aliases to the standard `auto` keyword. See bug 189811.

2023/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.or_syntax	Firefox	12/11/2018	Safari	3/27/2023	1567
css.at-rules.media.range_syntax	Firefox	6/28/2022	Safari	3/27/2023	272	Firefox: Only supports range notations where the feature name comes before any value `(width > 500px)`Firefox for Android: Only supports range notations where the feature name comes before any value `(width > 500px)`
css.properties.font-size.xxx-large	Firefox	10/22/2019	Safari	3/27/2023	1252
css.properties.font-size-adjust 📋	Firefox	6/17/2008	Safari	3/27/2023	5396	Firefox: Before Firefox 40, `font-size-adjust: 0` was incorrectly interpreted as `font-size-adjust: none` (bug 1144885).Firefox: Only supported on Windows.Firefox for Android: Before Firefox for Android 40, `font-size-adjust: 0` was incorrectly interpreted as `font-size-adjust: none` (bug 1144885).
css.properties.font-size-adjust.none 📋	Firefox	6/17/2008	Safari	3/27/2023	5396
css.properties.font-synthesis-small-caps 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-small-caps.auto 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-small-caps.none 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-style 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-style.auto 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-style.none 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-weight 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-weight.auto 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.font-synthesis-weight.none 📋	Firefox	3/14/2023	Safari	3/27/2023	13
css.properties.outline 📋	Firefox	4/19/2021	Safari	3/27/2023	707	Chrome: Before Chrome 94, `outline` does not follow the shape of `border-radius`.Chrome Android: Before Chrome Android 94, `outline` does not follow the shape of `border-radius`.Edge: Before Edge 94, `outline` does not follow the shape of `border-radius`.Firefox: Before Firefox 88, `outline` does not follow the shape of `border-radius`.Firefox for Android: Before Firefox for Android 88, `outline` does not follow the shape of `border-radius`.Quest Browser: Before Quest Browser 18.0, `outline` does not follow the shape of `border-radius`.Opera: Before Opera 80, `outline` does not follow the shape of `border-radius`.Safari: Before Safari 16.4, `outline` does not follow the shape of `border-radius`. See bug 20807.Safari on iOS: Before Safari on iOS 16.4, `outline` does not follow the shape of `border-radius`. See bug 20807.WebView Android: Before Chrome 94, `outline` does not follow the shape of `border-radius`.WebView on iOS: Before WebView on iOS 16.4, `outline` does not follow the shape of `border-radius`. See bug 20807.
css.selectors.backdrop.fullscreen	Firefox	6/7/2016	Safari	3/27/2023	2484
css.selectors.dir 📋	Firefox	9/20/2016	Safari	3/27/2023	2379
css.selectors.fullscreen 📋	Firefox	12/11/2018	Safari	3/27/2023	1567	Safari on iOS: Only available on iPad, not on iPhone.Safari on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.Safari on iOS: Only available on iPad, not on iPhone.WebView on iOS: Only available on iPad, not on iPhone.WebView on iOS: Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games.WebView on iOS: Only available on iPad, not on iPhone.

2023/2

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.container 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.at-rules.media.color-gamut 📋	Safari	9/20/2016	Firefox	2/14/2023	2338
css.properties.container 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-name 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-name.none 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-type 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-type.inline-size 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-type.normal 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.container-type.size 📋	Safari	9/12/2022	Firefox	2/14/2023	155
css.properties.page 📋	Safari	3/24/2020	Firefox	2/14/2023	1057
css.types.length.container_query_length_units	Safari	9/12/2022	Firefox	2/14/2023	155

2022/12

API	First Browser	Date	Last Browser	Date	Days
css.properties.align-items.flex_context.last_baseline	Firefox	3/7/2017	Safari	12/13/2022	2107
css.properties.align-self.flex_context.last_baseline	Firefox	3/7/2017	Safari	12/13/2022	2107
css.properties.font-variant-alternates.annotation 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.font-variant-alternates.character_variant 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.font-variant-alternates.ornaments 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.font-variant-alternates.styleset 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.font-variant-alternates.stylistic 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.font-variant-alternates.swash 📋	Firefox	12/1/2014	Safari	12/13/2022	2934
css.properties.text-emphasis-position.over	Safari	3/24/2020	Firefox	12/13/2022	994
css.properties.text-emphasis-position.under	Safari	3/24/2020	Firefox	12/13/2022	994
css.types.acos 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.asin 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.atan 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.atan2 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.calc-keyword 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.calc-keyword.e	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.calc-keyword.pi	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.cos 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.sin 📋	Safari	3/14/2022	Firefox	12/13/2022	274
css.types.tan 📋	Safari	3/14/2022	Firefox	12/13/2022	274

2022/11

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.font-palette-values 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.at-rules.font-palette-values.base-palette 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.at-rules.font-palette-values.font-family 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.at-rules.font-palette-values.override-colors 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.properties.font-palette 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.properties.font-palette.dark 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.properties.font-palette.light 📋	Safari	3/14/2022	Firefox	11/15/2022	246
css.properties.font-palette.normal 📋	Safari	3/14/2022	Firefox	11/15/2022	246

2022/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.forced-colors 📋	Firefox	6/1/2021	Safari	9/12/2022	468
css.at-rules.media.resolution 📋	Firefox	11/8/2011	Safari	9/12/2022	3961	Firefox: Supports `<integer>` values only.Firefox for Android: Supports `<integer>` values only.
css.properties.contain.inline-size 📋	Firefox	5/31/2022	Safari	9/12/2022	104
css.properties.flex-basis.fit-content	Firefox	11/2/2021	Safari	9/12/2022	314
css.properties.flex-basis.max-content	Firefox	3/19/2019	Safari	9/12/2022	1273
css.properties.flex-basis.min-content	Firefox	3/19/2019	Safari	9/12/2022	1273
css.properties.grid-template-columns.animation	Firefox	3/19/2019	Safari	9/12/2022	1273
css.properties.grid-template-columns.subgrid 📋	Firefox	12/10/2019	Safari	9/12/2022	1007
css.properties.grid-template-rows.animation	Firefox	3/19/2019	Safari	9/12/2022	1273
css.properties.grid-template-rows.subgrid 📋	Firefox	12/10/2019	Safari	9/12/2022	1007
css.properties.offset 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.auto 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.bottom 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.center 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.left 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.right 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-anchor.top 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-distance 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-path.path	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-rotate 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-rotate.auto 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.offset-rotate.reverse 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.properties.overflow.clip 📋	Firefox	9/22/2020	Safari	9/12/2022	720
css.properties.overflow-x.clip 📋	Firefox	9/22/2020	Safari	9/12/2022	720
css.properties.overflow-y.clip 📋	Firefox	9/22/2020	Safari	9/12/2022	720
css.properties.overscroll-behavior 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior.auto 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior.contain 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior.none 📋	Firefox	3/13/2018	Safari	9/12/2022	1644	Edge: The `none` value incorrectly behaves as `contain` (allowing for the elastic bounce effect).
css.properties.overscroll-behavior-block 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-block.auto 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-block.contain 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-block.none 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-inline 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-inline.auto 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-inline.contain 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-inline.none 📋	Firefox	2/11/2020	Safari	9/12/2022	944
css.properties.overscroll-behavior-x 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-x.auto 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-x.contain 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-x.none 📋	Firefox	3/13/2018	Safari	9/12/2022	1644	Edge: The `none` value incorrectly behaves as `contain` (allowing for the elastic bounce effect).
css.properties.overscroll-behavior-y 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-y.auto 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-y.contain 📋	Firefox	3/13/2018	Safari	9/12/2022	1644
css.properties.overscroll-behavior-y.none 📋	Firefox	3/13/2018	Safari	9/12/2022	1644	Edge: The `none` value incorrectly behaves as `contain` (allowing for the elastic bounce effect).
css.properties.resize.block	Firefox	10/23/2018	Safari	9/12/2022	1420
css.properties.resize.inline	Firefox	10/23/2018	Safari	9/12/2022	1420
css.properties.text-align-last 📋	Firefox	9/20/2016	Safari	9/12/2022	2183	Internet Explorer: IE only supports `text-align-last` when `text-align` is set to `justify`.Internet Explorer: The `start` and `end` values are not supported.
css.properties.text-align-last.auto 📋	Firefox	4/24/2012	Safari	9/12/2022	3793
css.properties.user-select.all	Firefox	11/9/2004	Safari	9/12/2022	6516
css.types.basic-shape.path.offset-path 📋	Firefox	1/7/2020	Safari	9/12/2022	979
css.types.overflow.clip	Firefox	9/22/2020	Safari	9/12/2022	720
css.types.resolution 📋	Firefox	11/8/2011	Safari	9/12/2022	3961	Firefox: Supports `<integer>` values only.Firefox for Android: Supports `<integer>` values only.
css.types.resolution.dpcm	Firefox	11/8/2011	Safari	9/12/2022	3961
css.types.resolution.dpi	Firefox	11/8/2011	Safari	9/12/2022	3961
css.types.resolution.dppx	Firefox	10/9/2012	Safari	9/12/2022	3625
css.types.resolution.x	Firefox	9/5/2018	Safari	9/12/2022	1468

2022/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.contain.style 📋	Safari	3/14/2022	Firefox	7/26/2022	134	Chrome: Before Chrome 115, style containment did not affect quotes, see bug 40592922.Chrome Android: Before Chrome Android 115, style containment did not affect quotes, see bug 40592922.Edge: Before Edge 115, style containment did not affect quotes, see bug 40592922.Quest Browser: Before Quest Browser false, style containment did not affect quotes, see bug 40592922.Opera: Before Opera 101, style containment did not affect quotes, see bug 40592922.Opera Android: Before Opera Android 77, style containment did not affect quotes, see bug 40592922.Safari: Style containment does not affect quotes, see bug 232083.Safari on iOS: Style containment does not affect quotes, see bug 232083.Samsung Internet: Before Samsung Internet 23.0, style containment did not affect quotes, see bug 40592922.WebView Android: Before WebView Android 115, style containment did not affect quotes, see bug 40592922.WebView on iOS: Style containment does not affect quotes, see bug 232083.
css.properties.scroll-snap-stop 📋	Safari	9/20/2021	Firefox	7/26/2022	309
css.properties.scroll-snap-stop.always 📋	Safari	9/20/2021	Firefox	7/26/2022	309
css.properties.scroll-snap-stop.normal 📋	Safari	9/20/2021	Firefox	7/26/2022	309
css.selectors.modal 📋	Safari	7/20/2022	Firefox	7/26/2022	6
css.properties.align-content.flex_context.start_end	Firefox	3/8/2016	Safari	7/20/2022	2325	Opera: Before version 79, this value is recognized, but has no effect.Opera Android: This value is recognized, but has no effect.

2022/5

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.media.prefers-contrast 📋	Safari	4/26/2021	Firefox	5/31/2022	400
css.types.length.vb	Safari	3/14/2022	Firefox	5/31/2022	78
css.types.length.vi	Safari	3/14/2022	Firefox	5/31/2022	78
css.types.length.viewport_percentage_units_dynamic	Safari	3/14/2022	Firefox	5/31/2022	78
css.types.length.viewport_percentage_units_large	Safari	3/14/2022	Firefox	5/31/2022	78
css.types.length.viewport_percentage_units_small	Safari	3/14/2022	Firefox	5/31/2022	78
css.at-rules.media.dynamic-range 📋	Safari	3/24/2020	Firefox	5/3/2022	770

2022/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.mix-blend-mode.plus-lighter 📋	Safari	3/21/2016	Firefox	4/5/2022	2206
css.properties.scroll-snap-type 📋	Safari	9/19/2017	Firefox	4/5/2022	1659	Edge: Edge supports an earlier draft of CSS Scroll Snap without axis values.Firefox: On macOS Monterey, scroll snapping does not complete reliably. See bug 1749352.Firefox: An earlier draft of CSS Scroll Snap without axis values.Firefox for Android: An earlier draft of CSS Scroll Snap without axis values.Internet Explorer: Internet Explorer supports an earlier draft of CSS Scroll Snap without axis values.Safari: Older Safari versions support an earlier draft of CSS Scroll Snap without axis values.Safari on iOS: Older Safari on iOS versions support an earlier draft of CSS Scroll Snap without axis values.WebView on iOS: Older WebView on iOS versions support an earlier draft of CSS Scroll Snap without axis values.

2022/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.import.layer 📋	Firefox	2/8/2022	Safari	3/14/2022	34
css.at-rules.layer 📋	Firefox	2/8/2022	Safari	3/14/2022	34
css.properties.accent-color 📋	Firefox	9/7/2021	Safari	3/14/2022	188	Safari: Safari does not adjust the color of glyphs (such as checkmarks) on form controls to maintain contrast. See bug 244233.Safari on iOS: Safari on iOS does not adjust the color of glyphs (such as checkmarks) on form controls to maintain contrast. See bug 244233.WebView on iOS: WebView on iOS does not adjust the color of glyphs (such as checkmarks) on form controls to maintain contrast. See bug 244233.
css.properties.accent-color.auto	Firefox	9/7/2021	Safari	3/14/2022	188
css.properties.align-items.flex_context.start_end	Firefox	3/8/2016	Safari	3/14/2022	2197
css.properties.align-self.flex_context.start_end	Firefox	3/8/2016	Safari	3/14/2022	2197	Opera: Before version 79, this value is recognized, but has no effect.
css.properties.appearance 📋	Firefox	8/25/2020	Safari	3/14/2022	566
css.properties.appearance.auto 📋	Firefox	8/25/2020	Safari	3/14/2022	566
css.properties.backface-visibility 📋	Firefox	10/9/2012	Safari	3/14/2022	3443
css.properties.background-attachment.fixed 📋	Firefox	10/24/2006	Safari	3/14/2022	5620	Safari: `local` is recognized but has no effect. See bug 219324.Safari on iOS: `fixed` is recognized but has no effect. See bug 219324.WebView on iOS: `fixed` is recognized but has no effect. See bug 219324.
css.properties.background-attachment.local 📋	Firefox	10/29/2013	Safari	3/14/2022	3058	Safari: `local` is recognized but has no effect. See bug 219324.Safari on iOS: `local` is recognized but has no effect. See bug 219324.Safari on iOS: If `-webkit-overflow-scrolling: touch` is set, then `local` has no effect.WebView on iOS: `local` is recognized but has no effect. See bug 219324.WebView on iOS: If `-webkit-overflow-scrolling: touch` is set, then `local` has no effect.
css.properties.background-position-x.side-relative_values	Firefox	9/20/2016	Safari	3/14/2022	2001
css.properties.background-position-y.side-relative_values	Firefox	9/20/2016	Safari	3/14/2022	2001
css.properties.color-adjust 📋	Firefox	1/7/2020	Safari	3/14/2022	797
css.properties.contain 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.content 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.layout 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.none 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.paint 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.size 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.contain.strict 📋	Firefox	9/3/2019	Safari	3/14/2022	923
css.properties.flex-basis.content	Firefox	6/26/2018	Safari	3/14/2022	1357
css.properties.justify-content.flex_context.start_end	Firefox	3/8/2016	Safari	3/14/2022	2197
css.properties.mask 📋	Firefox	4/19/2017	Safari	3/14/2022	1790	Chrome: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Chrome: While the property is recognized, values applied to it don't have any effect.Chrome Android: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Chrome Android: While the property is recognized, values applied to it don't have any effect.Edge: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Edge: While the property is recognized, values applied to it don't have any effect.Firefox: Only supports `mask: url(file.svg#mask_id)` or `mask: url(#mask_id)`, where the URL is a reference to an SVG `<mask>` element.Firefox for Android: Only supports `mask: url(file.svg#mask_id)` or `mask: url(#mask_id)`, where the URL is a reference to an SVG `<mask>` element.Quest Browser: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Quest Browser: While the property is recognized, values applied to it don't have any effect.Opera: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Opera: While the property is recognized, values applied to it don't have any effect.Opera Android: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Opera Android: While the property is recognized, values applied to it don't have any effect.Safari: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Safari: While the property is recognized, values applied to it don't have any effect.Safari on iOS: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Safari on iOS: While the property is recognized, values applied to it don't have any effect.Samsung Internet: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.Samsung Internet: While the property is recognized, values applied to it don't have any effect.WebView Android: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.WebView Android: While the property is recognized, values applied to it don't have any effect.WebView on iOS: The prefixed property can be used with SVG and HTML with a slightly different syntax, which allows setting the non-standard `-webkit-mask-attachment` property.WebView on iOS: While the property is recognized, values applied to it don't have any effect.
css.properties.mask-clip 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-composite 📋	Firefox	4/19/2017	Safari	3/14/2022	1790	Chrome: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Chrome Android: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Edge: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Opera: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Opera Android: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Safari: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Safari on iOS: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.Samsung Internet: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.WebView Android: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.WebView on iOS: See also `-webkit-mask-composite` for a similar non-standard property that uses different keywords.
css.properties.mask-composite.add 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-composite.exclude 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-composite.intersect 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-composite.subtract 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-image 📋	Firefox	4/19/2017	Safari	3/14/2022	1790	Chrome: From version 8, Chrome added support for gradient values. Initially, Chrome supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.Chrome Android: From version 18, Chrome Android added support for gradient values. Initially, Chrome Android supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.Quest Browser: From version 5.0, Quest Browser added support for gradient values. Initially, Quest Browser supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.Safari: Initially, Safari supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.Safari on iOS: Initially, Safari on iOS supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.WebView Android: Initially, Android supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.WebView on iOS: Initially, WebView on iOS supported only `-webkit-` prefixed values for gradients (such as `-webkit-linear-gradient()`). Later, support for unprefixed values was added.
css.properties.mask-mode 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-mode.alpha 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-mode.luminance 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-mode.match-source 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-origin 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-position 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-repeat 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.mask-size 📋	Firefox	4/19/2017	Safari	3/14/2022	1790
css.properties.offset-path 📋	Firefox	1/7/2020	Safari	3/14/2022	797	Samsung Internet: `path()` is the only value type supported.
css.properties.overflow-wrap.anywhere 📋	Firefox	1/29/2019	Safari	3/14/2022	1140
css.properties.print-color-adjust 📋	Firefox	2/8/2022	Safari	3/14/2022	34	Chrome: Chrome does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Chrome: Before version 26, if background images are clipped (for example, when using `background-image` sprites) and `-webkit-print-color-adjust` is set to `exact`, then backgrounds will appear distorted when printed. Solid backgrounds and background images that are not clipped (i.e., backgrounds that have narrower and shorter than the element to which they are applied) are printed correctly. See bug 40219905.Chrome Android: Chrome Android does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Chrome Android: Before version 26, if background images are clipped (for example, when using `background-image` sprites) and `-webkit-print-color-adjust` is set to `exact`, then backgrounds will appear distorted when printed. Solid backgrounds and background images that are not clipped (i.e., backgrounds that have narrower and shorter than the element to which they are applied) are printed correctly. See bug 40219905.Edge: Edge does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Quest Browser: Quest Browser does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Quest Browser: Before version 5.0, if background images are clipped (for example, when using `background-image` sprites) and `-webkit-print-color-adjust` is set to `exact`, then backgrounds will appear distorted when printed. Solid backgrounds and background images that are not clipped (i.e., backgrounds that have narrower and shorter than the element to which they are applied) are printed correctly. See bug 40219905.Opera: Opera does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Opera Android: Opera does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Safari: Safari does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Safari on iOS: Safari on iOS does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Samsung Internet: Samsung Internet does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.Samsung Internet: In version 1, if background images are clipped (for example, when using `background-image` sprites) and `-webkit-print-color-adjust` is set to `exact`, then backgrounds will appear distorted when printed. Solid backgrounds and background images that are not clipped (i.e., backgrounds that have narrower and shorter than the element to which they are applied) are printed correctly. See bug 40219905.WebView Android: WebView does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.WebView on iOS: WebView on iOS does not print backgrounds of the `<body>` element. If this property is set to `exact` for the `<body>` element, it will apply only to its descendants.
css.properties.scroll-behavior 📋	Firefox	2/24/2015	Safari	3/14/2022	2575
css.properties.scroll-behavior.auto 📋	Firefox	2/24/2015	Safari	3/14/2022	2575
css.properties.scroll-behavior.smooth 📋	Firefox	2/24/2015	Safari	3/14/2022	2575
css.properties.text-align.match-parent 📋	Firefox	8/11/2015	Safari	3/14/2022	2407
css.properties.text-combine-upright 📋	Firefox	8/2/2016	Safari	3/14/2022	2050	Chrome: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Chrome Android: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Firefox: Before version 81, Firefox implemented the property as animatable. This was corrected to spec in 81.Firefox for Android: Before version 81, Firefox for Android implemented the property as animatable. This was corrected to spec in 81.Quest Browser: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Opera: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Opera Android: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Safari: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Safari on iOS: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.Samsung Internet: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.WebView Android: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.WebView on iOS: This property was initially named `-webkit-text-combine` according to a 2011 version of the CSS3 Writing Modes specification, supporting the values `none` and `horizontal` without `digits`.
css.properties.text-decoration-skip-ink 📋	Firefox	10/22/2019	Safari	3/14/2022	874
css.properties.text-decoration-skip-ink.all 📋	Firefox	4/7/2020	Safari	3/14/2022	706
css.properties.text-decoration-skip-ink.auto 📋	Firefox	10/22/2019	Safari	3/14/2022	874
css.properties.text-decoration-skip-ink.none 📋	Firefox	10/22/2019	Safari	3/14/2022	874
css.selectors.backdrop 📋	Firefox	6/7/2016	Safari	3/14/2022	2106
css.selectors.backdrop.dialog	Firefox	3/8/2022	Safari	3/14/2022	6
css.selectors.focus-visible 📋	Firefox	1/26/2021	Safari	3/14/2022	412
css.types.global_keywords.revert-layer 📋	Firefox	2/8/2022	Safari	3/14/2022	34
css.types.length.ic	Firefox	2/8/2022	Safari	3/14/2022	34
css.types.transform-function.perspective.none 📋	Firefox	10/5/2021	Safari	3/14/2022	160
css.properties.hyphenate-character.auto 📋	Safari	7/20/2011	Firefox	3/8/2022	3884

2022/2

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.print-color-adjust.economy 📋	Safari	7/25/2012	Firefox	2/8/2022	3485
css.properties.print-color-adjust.exact 📋	Safari	7/25/2012	Firefox	2/8/2022	3485

2022/1

API	First Browser	Date	Last Browser	Date	Days
css.properties.color-scheme 📋	Safari	9/19/2019	Firefox	1/11/2022	845
css.properties.color-scheme.dark	Safari	9/19/2019	Firefox	1/11/2022	845
css.properties.color-scheme.light	Safari	9/19/2019	Firefox	1/11/2022	845
css.properties.color-scheme.normal	Safari	9/19/2019	Firefox	1/11/2022	845
css.properties.color-scheme.only_dark	Safari	9/19/2019	Firefox	1/11/2022	845
css.properties.color-scheme.only_light	Safari	9/19/2019	Firefox	1/11/2022	845
css.types.color.hwb 📋	Safari	9/20/2021	Firefox	1/11/2022	113

2021/11

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.block-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.height.fit-content 📋	Safari	9/19/2017	Firefox	11/2/2021	1505
css.properties.inline-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.max-block-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.max-height.fit-content 📋	Safari	9/19/2017	Firefox	11/2/2021	1505	Firefox: Firefox implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.Firefox for Android: Firefox for Android implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.
css.properties.max-inline-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.max-width.fit-content 📋	Safari	9/19/2017	Firefox	11/2/2021	1505	Firefox: Firefox implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.Firefox for Android: Firefox for Android implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.
css.properties.min-block-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.min-height.fit-content	Safari	9/19/2017	Firefox	11/2/2021	1505	Firefox: Firefox implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.Firefox for Android: Firefox for Android implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.
css.properties.min-inline-size.fit-content	Safari	3/25/2019	Firefox	11/2/2021	953
css.properties.min-width.fit-content	Safari	9/19/2017	Firefox	11/2/2021	1505	Firefox: Firefox implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.Firefox for Android: Firefox for Android implements the definitions given in CSS3 Basic Box. This defines `available` and not `fit-available`. Also, the definition of `fit-content` is simpler than in CSS3 Sizing.
css.properties.width.fit-content 📋	Safari	9/19/2017	Firefox	11/2/2021	1505

2021/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.font-synthesis.small-caps	Safari	3/27/2017	Firefox	10/5/2021	1653
css.properties.image-rendering.pixelated 📋	Safari	9/20/2016	Firefox	10/5/2021	1841

2021/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.aspect-ratio 📋	Firefox	6/1/2021	Safari	9/20/2021	111
css.properties.aspect-ratio.auto 📋	Firefox	6/1/2021	Safari	9/20/2021	111
css.properties.border-end-end-radius 📋	Firefox	3/19/2019	Safari	9/20/2021	916
css.properties.border-end-start-radius 📋	Firefox	3/19/2019	Safari	9/20/2021	916
css.properties.border-start-end-radius 📋	Firefox	3/19/2019	Safari	9/20/2021	916
css.properties.border-start-start-radius 📋	Firefox	3/19/2019	Safari	9/20/2021	916
css.properties.clear.inline-end 📋	Firefox	8/8/2017	Safari	9/20/2021	1504
css.properties.clear.inline-start 📋	Firefox	8/8/2017	Safari	9/20/2021	1504
css.properties.display.multi-keyword_values	Firefox	10/22/2019	Safari	9/20/2021	699
css.properties.float.inline-end 📋	Firefox	8/8/2017	Safari	9/20/2021	1504
css.properties.float.inline-start 📋	Firefox	8/8/2017	Safari	9/20/2021	1504
css.properties.list-style-type.cjk-decimal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.disclosure-closed 📋	Firefox	10/14/2014	Safari	9/20/2021	2533
css.properties.list-style-type.disclosure-open 📋	Firefox	10/14/2014	Safari	9/20/2021	2533
css.properties.list-style-type.ethiopic-numeric 📋	Firefox	10/14/2014	Safari	9/20/2021	2533	Firefox: Before Firefox 38, Firefox added a dot as suffix of the number for `ethiopic-numeric` (for example, ፫. instead of ፫). The specification later defined the absence of a suffix, which Firefox 38 followed.Firefox for Android: Before Firefox for Android 38, Firefox for Android added a dot as suffix of the number for `ethiopic-numeric` (for example, ፫. instead of ፫). The specification later defined the absence of a suffix, which Firefox for Android 38 followed.
css.properties.list-style-type.japanese-formal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.japanese-informal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.korean-hangul-formal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.korean-hanja-formal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.korean-hanja-informal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.simp-chinese-formal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.simp-chinese-informal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.tamil 📋	Firefox	10/14/2014	Safari	9/20/2021	2533
css.properties.list-style-type.trad-chinese-formal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.list-style-type.trad-chinese-informal 📋	Firefox	3/18/2014	Safari	9/20/2021	2743
css.properties.scroll-margin-block 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-margin-block-end 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-margin-block-start 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-margin-inline 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-margin-inline-end 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-margin-inline-start 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block-end 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block-end.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block-start 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-block-start.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline-end 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline-end.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline-start 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.properties.scroll-padding-inline-start.auto 📋	Firefox	7/9/2019	Safari	9/20/2021	804
css.selectors.any-link.not_match_link	Firefox	3/23/2021	Safari	9/20/2021	181
css.selectors.autofill 📋	Firefox	2/23/2021	Safari	9/20/2021	209
css.selectors.link.not_match_link	Firefox	3/23/2021	Safari	9/20/2021	181
css.selectors.visited.not_match_link	Firefox	3/23/2021	Safari	9/20/2021	181
css.types.gradient.linear-gradient.premultiplied_gradients	Firefox	2/24/2015	Safari	9/20/2021	2400
css.types.gradient.radial-gradient.premultiplied_gradients	Firefox	2/24/2015	Safari	9/20/2021	2400
css.properties.break-inside.avoid-column	Safari	3/24/2020	Firefox	9/7/2021	532
css.properties.break-inside.avoid-page	Safari	3/24/2020	Firefox	9/7/2021	532
css.properties.break-inside.multicol_context.avoid-column	Safari	9/20/2016	Firefox	9/7/2021	1813
css.properties.font-family.system-ui	Safari	9/19/2017	Firefox	9/7/2021	1449	Firefox: Supported on macOS only.

2021/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.tab-size 📋	Safari	10/22/2013	Firefox	8/10/2021	2849	Chrome: This property is not yet animatable.Chrome Android: This property is not yet animatable.Edge: This property is not yet animatable.Firefox: Before Firefox 53, this property was not animatable.Firefox for Android: Before Firefox for Android 53, this property was not animatable.Quest Browser: This property is not yet animatable.Samsung Internet: This property is not yet animatable.

2021/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.scroll-margin 📋	Safari	4/26/2021	Firefox	7/13/2021	78	Firefox: The `scroll-margin` property can cause an element's visibility to be incorrectly calculated for `element.focus()`. See bug 1708303.Firefox for Android: The `scroll-margin` property can cause an element's visibility to be incorrectly calculated for `element.focus()`. See bug 1708303.Safari: Before version 14.1, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.Safari on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.WebView on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.

2021/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.supports.selector	Firefox	9/3/2019	Safari	4/26/2021	601
css.properties.border-block 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-block-color 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-block-style 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-block-width 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-inline 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-inline-color 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-inline-style 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.border-inline-width 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.column-gap.flex_context 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.gap.flex_context 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.gap.multicol_context 📋	Firefox	6/26/2018	Safari	4/26/2021	1035
css.properties.inset 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.inset.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-block 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-block.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-block-end 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-block-end.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-block-start 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-block-start.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-inline 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-inline.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-inline-end 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-inline-end.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.inset-inline-start 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.inset-inline-start.auto 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.list-style-type.string	Firefox	7/2/2015	Safari	4/26/2021	2125
css.properties.margin-block 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.margin-inline 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.padding-block 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.padding-inline 📋	Firefox	3/19/2019	Safari	4/26/2021	769
css.properties.quotes.auto 📋	Firefox	10/22/2019	Safari	4/26/2021	552	Internet Explorer: This value is not supported, but the default browser behavior is to choose appropriate quotes for the user's language setting
css.properties.rotate 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.rotate.none 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.rotate.x_y_z_angle	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.row-gap.flex_context 📋	Firefox	10/23/2018	Safari	4/26/2021	916
css.properties.scale 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.scale.none 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.scroll-margin-bottom 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Before version 14.1, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.Safari on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.WebView on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.
css.properties.scroll-margin-left 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Before version 14.1, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.Safari on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.WebView on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.
css.properties.scroll-margin-right 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Before version 14.1, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.Safari on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.WebView on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.
css.properties.scroll-margin-top 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Before version 14.1, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.Safari on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.WebView on iOS: Before version 14.5, scroll margin is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 189265.
css.properties.scroll-padding 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.Safari on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.WebView on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.
css.properties.scroll-padding-bottom 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.Safari on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.WebView on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.
css.properties.scroll-padding-left 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.Safari on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.WebView on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.
css.properties.scroll-padding-right 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.Safari on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.WebView on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.
css.properties.scroll-padding-top 📋	Firefox	7/9/2019	Safari	4/26/2021	657	Safari: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.Safari on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.WebView on iOS: Scroll padding is not applied for scrolls to fragment target or `scrollIntoView()`, see bug 179379.
css.properties.translate 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.properties.translate.none 📋	Firefox	1/7/2020	Safari	4/26/2021	475
css.selectors.file-selector-button 📋	Firefox	10/20/2020	Safari	4/26/2021	188

2021/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.touch-action.pinch-zoom	Safari	9/19/2019	Firefox	1/26/2021	495	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.Firefox for Android: Not applicable to Firefox for Android platforms that support neither pointer nor touch events.

2020/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.not.selector_list	Safari	9/30/2015	Firefox	12/15/2020	1903

2020/11

API	First Browser	Date	Last Browser	Date	Days
css.types.gradient.conic-gradient 📋	Safari	3/25/2019	Firefox	11/17/2020	603
css.types.gradient.conic-gradient.doubleposition	Safari	3/25/2019	Firefox	11/17/2020	603
css.types.gradient.repeating-conic-gradient 📋	Safari	3/25/2019	Firefox	11/17/2020	603

2020/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.is.forgiving_selector_list	Safari	9/16/2020	Firefox	10/20/2020	34
css.selectors.where.forgiving_selector_list	Safari	9/16/2020	Firefox	10/20/2020	34

2020/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.flex-direction.column-reverse 📋	Safari	10/22/2013	Firefox	9/22/2020	2527	Firefox: Before Firefox 81, overflow with `column-reverse` was unsupported. See bug 1042151.Firefox for Android: Before Firefox for Android 81, overflow with `column-reverse` was unsupported. See bug 1042151.
css.properties.flex-direction.row-reverse 📋	Safari	10/22/2013	Firefox	9/22/2020	2527	Firefox: Before Firefox 81, overflow with `column-reverse` was unsupported. See bug 1042151.Firefox for Android: Before Firefox for Android 81, overflow with `column-reverse` was unsupported. See bug 1042151.
css.properties.animation-timing-function.jump	Firefox	1/29/2019	Safari	9/16/2020	596
css.properties.background-clip.text 📋	Firefox	9/20/2016	Safari	9/16/2020	1457	Chrome: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Chrome Android: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Edge: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Edge: Before Edge 15, this value was supported with the prefixed version of the property only.Firefox: Does not work with `background-attachment: fixed` (bug 1313757), in multi-layer backgrounds with other values (bug 1481498), and in some other special cases (see bug 1656784).Firefox for Android: Does not work with `background-attachment: fixed` (bug 1313757), in multi-layer backgrounds with other values (bug 1481498), and in some other special cases (see bug 1656784).Quest Browser: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Opera: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Opera Android: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).Safari: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`).Safari on iOS: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`).Samsung Internet: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).WebView Android: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`; see bug 40229927).WebView on iOS: The `text` value is only supported by `-webkit-background-clip` (and not by `background-clip`).
css.properties.text-orientation 📋	Firefox	9/22/2015	Safari	9/16/2020	1821
css.properties.transition-timing-function.jump	Firefox	1/29/2019	Safari	9/16/2020	596
css.selectors.is 📋	Firefox	6/30/2020	Safari	9/16/2020	78	Chrome: Doesn't support combinators.Chrome Android: Doesn't support combinators.Edge: Doesn't support combinators.Firefox: Doesn't support combinators.Firefox: See bug 906353.Firefox for Android: Doesn't support combinators.Firefox for Android: See bug 906353.Quest Browser: Doesn't support combinators.Opera: Doesn't support combinators.Opera Android: Doesn't support combinators.Safari: Doesn't support combinators.Safari on iOS: Doesn't support combinators.WebView Android: Doesn't support combinators.WebView on iOS: Doesn't support combinators.
css.selectors.where 📋	Firefox	6/30/2020	Safari	9/16/2020	78
css.types.easing-function.steps.jump	Firefox	1/29/2019	Safari	9/16/2020	596

2020/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.appearance.menulist-button 📋	Safari	10/26/2007	Firefox	8/25/2020	4687	Firefox: See bug 1481615.Firefox for Android: See bug 1481615.

2020/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.read-only 📋	Safari	6/8/2009	Firefox	6/30/2020	4040
css.selectors.read-write 📋	Safari	6/8/2009	Firefox	6/30/2020	4040

2020/5

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.grid-template-columns.repeat 📋	Safari	3/27/2017	Firefox	5/5/2020	1135	Firefox: `repeat(auto-fill, ...)` and `repeat(auto-fit, ...)` only support one repeated column (see bug 1341507).Firefox: `calc()` doesn't work in `repeat()` (see bug 1350069).Firefox for Android: `repeat(auto-fill, ...)` and `repeat(auto-fit, ...)` only support one repeated column (see bug 1341507).Firefox for Android: `calc()` doesn't work in `repeat()` (see bug 1350069).
css.properties.grid-template-rows.repeat 📋	Safari	3/27/2017	Firefox	5/5/2020	1135	Firefox: `repeat(auto-fill, ...)` and `repeat(auto-fit, ...)` only support one repeated column (see bug 1341507).Firefox: `calc()` doesn't work in `repeat()` (see bug 1350069).Firefox for Android: `repeat(auto-fill, ...)` and `repeat(auto-fit, ...)` only support one repeated column (see bug 1341507).Firefox for Android: `calc()` doesn't work in `repeat()` (see bug 1350069).

2020/4

API	First Browser	Date	Last Browser	Date	Days
css.types.clamp 📋	Safari	3/24/2020	Firefox	4/7/2020	14
css.types.max 📋	Safari	4/12/2018	Firefox	4/7/2020	726
css.types.min 📋	Safari	4/12/2018	Firefox	4/7/2020	726

2020/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background-position.bottom 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.background-position.center 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.background-position.left 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.background-position.right 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.background-position.top 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.border-collapse.collapse	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.border-collapse.separate	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-after.auto	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-after.avoid	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-after.left	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-after.page	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-after.right	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-before.auto	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-before.avoid	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-before.left	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-before.page	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-before.right	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-inside.auto	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.break-inside.avoid	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.caption-side.bottom	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.caption-side.top	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.clip.auto	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.clip-path.fill-box 📋	Firefox	1/24/2017	Safari	3/24/2020	1155	Firefox: This value was supported before Firefox 51, but as an alias to `border-box`.Firefox for Android: This value was supported before Firefox for Android 51, but as an alias to `border-box`.
css.properties.clip-path.path	Firefox	12/10/2019	Safari	3/24/2020	105
css.properties.clip-path.stroke-box 📋	Firefox	1/24/2017	Safari	3/24/2020	1155	Firefox: This value was supported before Firefox 51, but as an alias to `border-box`.Firefox for Android: This value was supported before Firefox for Android 51, but as an alias to `border-box`.
css.properties.clip-path.view-box 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.color-interpolation 📋	Firefox	1/7/2020	Safari	3/24/2020	77	Chrome: Only the default value of `sRGB` is implementedChrome Android: Only the default value of `sRGB` is implementedEdge: Only the default value of `sRGB` is implementedQuest Browser: Only the default value of `sRGB` is implementedOpera: Only the default value of `sRGB` is implementedOpera Android: Only the default value of `sRGB` is implementedSafari: Only the default value of `sRGB` is implementedSafari on iOS: Only the default value of `sRGB` is implementedSamsung Internet: Only the default value of `sRGB` is implementedWebView Android: Only the default value of `sRGB` is implementedWebView on iOS: Only the default value of `sRGB` is implemented
css.properties.color-interpolation.sRGB	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.cx 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.cy 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.display.table-caption	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.alphabetic 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.auto 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.central 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.hanging 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.ideographic 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.mathematical 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.dominant-baseline.middle 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.fill 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.fill-opacity 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.fill-rule 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.fill-rule.evenodd 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.fill-rule.nonzero 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.font-optical-sizing 📋	Firefox	9/5/2018	Safari	3/24/2020	566
css.properties.font-optical-sizing.auto 📋	Firefox	9/5/2018	Safari	3/24/2020	566
css.properties.font-optical-sizing.none 📋	Firefox	9/5/2018	Safari	3/24/2020	566
css.properties.font-variant-alternates.historical-forms 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.font-variant-alternates.normal 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.font-variant-position.normal 📋	Firefox	1/7/2020	Safari	3/24/2020	77	Chrome: The property is recognized, but has no effect.Chrome Android: The property is recognized, but has no effect.Edge: The property is recognized, but has no effect.Quest Browser: The property is recognized, but has no effect.Opera: The property is recognized, but has no effect.Opera Android: The property is recognized, but has no effect.Samsung Internet: The property is recognized, but has no effect.WebView Android: The property is recognized, but has no effect.
css.properties.font-variant-position.sub 📋	Firefox	1/7/2020	Safari	3/24/2020	77	Chrome: The property is recognized, but has no effect.Chrome Android: The property is recognized, but has no effect.Edge: The property is recognized, but has no effect.Quest Browser: The property is recognized, but has no effect.Opera: The property is recognized, but has no effect.Opera Android: The property is recognized, but has no effect.Samsung Internet: The property is recognized, but has no effect.WebView Android: The property is recognized, but has no effect.
css.properties.font-variant-position.super 📋	Firefox	1/7/2020	Safari	3/24/2020	77	Chrome: The property is recognized, but has no effect.Chrome Android: The property is recognized, but has no effect.Edge: The property is recognized, but has no effect.Quest Browser: The property is recognized, but has no effect.Opera: The property is recognized, but has no effect.Opera Android: The property is recognized, but has no effect.Samsung Internet: The property is recognized, but has no effect.WebView Android: The property is recognized, but has no effect.
css.properties.image-orientation 📋	Firefox	12/10/2013	Safari	3/24/2020	2296
css.properties.image-orientation.from-image 📋	Firefox	12/10/2013	Safari	3/24/2020	2296
css.properties.image-orientation.none 📋	Firefox	12/10/2013	Safari	3/24/2020	2296
css.properties.marker 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.marker-end 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.marker-mid 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.marker-start 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.opacity.percentages	Firefox	10/22/2019	Safari	3/24/2020	154
css.properties.overflow.multiple_keywords	Firefox	6/26/2018	Safari	3/24/2020	637
css.properties.r 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.scroll-snap-type.block 📋	Firefox	7/9/2019	Safari	3/24/2020	259
css.properties.scroll-snap-type.both 📋	Firefox	7/9/2019	Safari	3/24/2020	259
css.properties.scroll-snap-type.inline 📋	Firefox	7/9/2019	Safari	3/24/2020	259
css.properties.scroll-snap-type.none 📋	Firefox	7/2/2015	Safari	3/24/2020	1727
css.properties.scroll-snap-type.x 📋	Firefox	7/9/2019	Safari	3/24/2020	259
css.properties.scroll-snap-type.y 📋	Firefox	7/9/2019	Safari	3/24/2020	259
css.properties.shape-rendering 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stop-color 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stop-opacity 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-dasharray 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-dasharray.none 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-dashoffset 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-linecap 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-linecap.butt 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-linecap.round 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-linecap.square 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-linejoin 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-linejoin.bevel 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-linejoin.miter 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-linejoin.round 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.stroke-miterlimit 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-opacity 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.stroke-width 📋	Firefox	11/9/2004	Safari	3/24/2020	5614
css.properties.tab-size.length 📋	Firefox	4/19/2017	Safari	3/24/2020	1070
css.properties.text-anchor 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.circle 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.dot 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.double-circle 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.filled 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.none 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.sesame 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-emphasis-style.triangle 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-orientation.mixed 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.text-orientation.upright 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.transform-box.border-box 📋	Firefox	8/8/2017	Safari	3/24/2020	959
css.properties.transform-box.fill-box 📋	Firefox	8/8/2017	Safari	3/24/2020	959
css.properties.transform-box.view-box 📋	Firefox	8/8/2017	Safari	3/24/2020	959
css.properties.vector-effect 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.white-space.break-spaces 📋	Firefox	9/3/2019	Safari	3/24/2020	203
css.properties.x 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.properties.y 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.selectors.part 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.types.basic-shape.path 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.types.basic-shape.path.clip-path 📋	Firefox	1/7/2020	Safari	3/24/2020	77
css.types.length.Q	Firefox	9/20/2016	Safari	3/24/2020	1281
css.properties.text-underline-position 📋	Safari	3/25/2019	Firefox	3/10/2020	351
css.properties.text-underline-position.from-font	Safari	3/25/2019	Firefox	3/10/2020	351
css.properties.text-underline-position.under	Safari	3/25/2019	Firefox	3/10/2020	351

2020/1

API	First Browser	Date	Last Browser	Date	Days
css.properties.border-image-repeat.repeat 📋	Safari	7/25/2012	Firefox	1/7/2020	2722
css.properties.border-image-repeat.stretch 📋	Safari	7/25/2012	Firefox	1/7/2020	2722
css.properties.flex.none 📋	Safari	10/22/2013	Firefox	1/7/2020	2268
css.properties.flex-direction.column 📋	Safari	10/22/2013	Firefox	1/7/2020	2268
css.properties.flex-direction.row 📋	Safari	10/22/2013	Firefox	1/7/2020	2268
css.properties.font-synthesis.style	Safari	3/27/2017	Firefox	1/7/2020	1016
css.properties.font-synthesis.weight	Safari	3/27/2017	Firefox	1/7/2020	1016
css.properties.letter-spacing.svg_elements	Safari	7/20/2011	Firefox	1/7/2020	3093
css.properties.list-style-type.none 📋	Safari	6/23/2003	Firefox	1/7/2020	6042
css.properties.transform-origin.bottom 📋	Safari	4/29/2005	Firefox	1/7/2020	5366
css.properties.transform-origin.center 📋	Safari	4/29/2005	Firefox	1/7/2020	5366
css.properties.transform-origin.left 📋	Safari	4/29/2005	Firefox	1/7/2020	5366
css.properties.transform-origin.right 📋	Safari	4/29/2005	Firefox	1/7/2020	5366
css.properties.transform-origin.top 📋	Safari	4/29/2005	Firefox	1/7/2020	5366
css.properties.word-spacing.svg_elements	Safari	7/20/2011	Firefox	1/7/2020	3093

2019/12

API	First Browser	Date	Last Browser	Date	Days
css.properties.column-span 📋	Safari	9/30/2015	Firefox	12/10/2019	1532
css.properties.column-span.all 📋	Safari	7/20/2011	Firefox	12/10/2019	3065
css.properties.column-span.none 📋	Safari	7/20/2011	Firefox	12/10/2019	3065

2019/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.grid-auto-columns 📋	Safari	3/27/2017	Firefox	10/22/2019	939	Firefox: Does not accept multiple track-size values. See bug 1339672.Firefox for Android: Does not accept multiple track-size values. See bug 1339672.
css.properties.grid-auto-rows 📋	Safari	3/27/2017	Firefox	10/22/2019	939	Firefox: Does not accept multiple track-size values. See bug 1339672.Firefox for Android: Does not accept multiple track-size values. See bug 1339672.
css.properties.text-decoration-thickness 📋	Safari	3/25/2019	Firefox	10/22/2019	211	Chrome: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Chrome Android: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Edge: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Quest Browser: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Opera: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Opera Android: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.Samsung Internet: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.WebView Android: The `text-decoration-thickness` property does not work unless either `text-underline-offset` is set to something other than `auto` or `text-decoration-color` is set to something other than `currentColor`. See bug 40734940.
css.properties.text-decoration-thickness.auto 📋	Safari	3/25/2019	Firefox	10/22/2019	211
css.properties.text-decoration-thickness.from-font 📋	Safari	3/25/2019	Firefox	10/22/2019	211
css.properties.text-underline-offset 📋	Safari	3/25/2019	Firefox	10/22/2019	211
css.properties.text-underline-offset.auto 📋	Safari	3/25/2019	Firefox	10/22/2019	211

2019/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.display-mode 📋	Firefox	6/7/2016	Safari	9/19/2019	1199	Firefox: Firefox 47 and later support `display-mode` values `fullscreen` and `browser`. Firefox 57 added support for `minimal-ui` and `standalone` values.Firefox for Android: Only supports the `browser` value, which always reports `true`.
css.properties.display.flow-root	Firefox	4/19/2017	Safari	9/19/2019	883
css.properties.line-break.anywhere 📋	Firefox	9/3/2019	Safari	9/19/2019	16
css.properties.position.sticky 📋	Firefox	9/2/2014	Safari	9/19/2019	1843
css.properties.touch-action 📋	Firefox	3/7/2017	Safari	9/19/2019	926	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.
css.properties.touch-action.manipulation	Firefox	3/7/2017	Safari	9/19/2019	926	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.
css.properties.touch-action.none	Firefox	3/7/2017	Safari	9/19/2019	926	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.
css.properties.touch-action.pan-x	Firefox	3/7/2017	Safari	9/19/2019	926	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.
css.properties.touch-action.pan-y	Firefox	3/7/2017	Safari	9/19/2019	926	Firefox: Not applicable to Firefox platforms that support neither pointer nor touch events.
css.properties.line-break 📋	Safari	9/19/2017	Firefox	9/3/2019	714
css.properties.line-break.auto 📋	Safari	10/22/2013	Firefox	9/3/2019	2142
css.properties.line-break.loose 📋	Safari	10/16/2014	Firefox	9/3/2019	1783
css.properties.line-break.normal 📋	Safari	4/29/2005	Firefox	9/3/2019	5240
css.properties.line-break.strict 📋	Safari	10/16/2014	Firefox	9/3/2019	1783
css.properties.user-select 📋	Safari	10/26/2007	Firefox	9/3/2019	4330

2019/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.scroll-padding.auto 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.properties.scroll-snap-align 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.properties.scroll-snap-align.center 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.properties.scroll-snap-align.end 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.properties.scroll-snap-align.none 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.properties.scroll-snap-align.start 📋	Safari	9/19/2017	Firefox	7/9/2019	658
css.selectors.marker 📋	Safari	4/12/2018	Firefox	7/9/2019	453	Safari: Safari support is limited to `color` and `font-size`. See bug 204163.Safari on iOS: Safari on iOS support is limited to `color` and `font-size`. See bug 204163.WebView on iOS: WebView on iOS support is limited to `color` and `font-size`. See bug 204163.

2019/5

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.media.prefers-color-scheme 📋	Safari	3/25/2019	Firefox	5/21/2019	57
css.properties.word-break.break-word 📋	Safari	10/26/2007	Firefox	5/21/2019	4225
css.types.global_keywords.revert 📋	Safari	3/21/2016	Firefox	5/21/2019	1156

2019/3

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.font-face.OpenType_SVG	Firefox	7/22/2014	Safari	3/25/2019	1707
css.properties.block-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.block-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.block-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.border-block-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-end-color 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-end-style 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-end-width 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-start-color 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-start-style 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-block-start-width 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-end-color 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-end-style 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-end-width 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-start-color 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-start-style 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.border-inline-start-width 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.column-gap.multicol_context.calc_values	Firefox	6/26/2018	Safari	3/25/2019	272
css.properties.gap.grid_context.calc_values	Firefox	3/7/2017	Safari	3/25/2019	748
css.properties.inline-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.inline-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.inline-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.margin-block-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.margin-block-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.margin-inline-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.margin-inline-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.max-block-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.max-block-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.max-block-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.max-inline-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.max-inline-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.max-inline-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.min-block-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.min-block-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.min-block-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.min-inline-size 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.min-inline-size.max-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.min-inline-size.min-content	Firefox	3/19/2019	Safari	3/25/2019	6
css.properties.padding-block-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.padding-block-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.padding-inline-end 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.padding-inline-start 📋	Firefox	9/22/2015	Safari	3/25/2019	1280
css.properties.text-decoration-color 📋	Firefox	2/24/2015	Safari	3/25/2019	1490
css.properties.text-decoration-line 📋	Firefox	2/24/2015	Safari	3/25/2019	1490
css.properties.text-decoration-style 📋	Firefox	2/24/2015	Safari	3/25/2019	1490
css.types.color.hsl.alpha_parameter	Firefox	3/7/2017	Safari	3/25/2019	748
css.types.color.hsl.space_separated_parameters	Firefox	3/7/2017	Safari	3/25/2019	748
css.types.color.rgb.alpha_parameter	Firefox	3/7/2017	Safari	3/25/2019	748
css.types.color.rgb.float_values	Firefox	3/7/2017	Safari	3/25/2019	748
css.types.color.rgb.space_separated_parameters	Firefox	3/7/2017	Safari	3/25/2019	748
css.types.gradient.linear-gradient.doubleposition	Firefox	12/11/2018	Safari	3/25/2019	104
css.types.gradient.radial-gradient.doubleposition	Firefox	12/11/2018	Safari	3/25/2019	104
css.types.gradient.repeating-linear-gradient.doubleposition	Firefox	12/11/2018	Safari	3/25/2019	104
css.types.gradient.repeating-radial-gradient.doubleposition	Firefox	12/11/2018	Safari	3/25/2019	104
css.properties.height.max-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.height.min-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.max-height.max-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.max-height.min-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.max-width.max-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.max-width.min-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.min-height.max-content	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.min-height.min-content	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.min-width.max-content	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.min-width.min-content	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.width.max-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546
css.properties.width.min-content 📋	Safari	9/19/2017	Firefox	3/19/2019	546

2019/1

API	First Browser	Date	Last Browser	Date	Days
css.properties.break-after 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-after.paged_context 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-after.paged_context.page	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-before 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-before.paged_context 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-before.paged_context.page	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-inside 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-inside.multicol_context 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.break-inside.paged_context 📋	Safari	9/20/2016	Firefox	1/29/2019	861
css.properties.custom-property.env 📋	Safari	4/12/2018	Firefox	1/29/2019	292
css.properties.custom-property.env.safe-area-inset-bottom 📋	Safari	9/19/2017	Firefox	1/29/2019	497
css.properties.custom-property.env.safe-area-inset-left 📋	Safari	9/19/2017	Firefox	1/29/2019	497
css.properties.custom-property.env.safe-area-inset-right 📋	Safari	9/19/2017	Firefox	1/29/2019	497
css.properties.custom-property.env.safe-area-inset-top 📋	Safari	9/19/2017	Firefox	1/29/2019	497
css.properties.image-rendering.crisp-edges 📋	Safari	10/22/2013	Firefox	1/29/2019	1925

2018/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.any-hover 📋	Safari	9/30/2015	Firefox	12/11/2018	1168
css.at-rules.media.any-pointer 📋	Safari	9/30/2015	Firefox	12/11/2018	1168
css.at-rules.media.hover 📋	Safari	9/30/2015	Firefox	12/11/2018	1168	Chrome: Before Chrome 41, the implementation was buggy and reported `(hover: none)` on non-touch-based computers with a mouse/trackpad. See bug 40397980.Opera: Before Opera 28, the implementation was buggy and reported `(hover: none)` on non-touch-based computers with a mouse/trackpad. See bug 40397980.
css.at-rules.media.pointer 📋	Safari	9/30/2015	Firefox	12/11/2018	1168

2018/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.-webkit-device-pixel-ratio 📋	Safari	10/26/2007	Firefox	10/23/2018	4015	Firefox: Implemented as an alias for `-moz-device-pixel-ratio`.Firefox for Android: Implemented as an alias for `-moz-device-pixel-ratio`.
css.at-rules.media.-webkit-max-device-pixel-ratio 📋	Safari	10/26/2007	Firefox	10/23/2018	4015	Firefox: Implemented as an alias for `max--moz-device-pixel-ratio`.Firefox for Android: Implemented as an alias for `max--moz-device-pixel-ratio`.
css.at-rules.media.-webkit-min-device-pixel-ratio 📋	Safari	10/26/2007	Firefox	10/23/2018	4015	Firefox: Implemented as an alias for `min--moz-device-pixel-ratio`.Firefox for Android: Implemented as an alias for `min--moz-device-pixel-ratio`.
css.at-rules.media.prefers-reduced-motion 📋	Safari	3/27/2017	Firefox	10/23/2018	575
css.properties.content.element_replacement	Safari	9/30/2015	Firefox	10/23/2018	1119
css.selectors.defined 📋	Safari	9/20/2016	Firefox	10/23/2018	763
css.selectors.host 📋	Safari	9/20/2016	Firefox	10/23/2018	763
css.selectors.hostfunction 📋	Safari	9/20/2016	Firefox	10/23/2018	763	Safari: Certain CSS selectors do not work (:host > .local-child) and styling slotted content (::slotted) is buggy.Safari on iOS: Certain CSS selectors do not work (:host > .local-child) and styling slotted content (::slotted) is buggy.WebView on iOS: Certain CSS selectors do not work (:host > .local-child) and styling slotted content (::slotted) is buggy.
css.selectors.slotted 📋	Safari	9/20/2016	Firefox	10/23/2018	763

2018/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.calc 📋	Firefox	3/13/2018	Safari	9/17/2018	188
css.properties.column-gap.grid_context 📋	Firefox	6/26/2018	Safari	9/17/2018	83
css.properties.column-gap.multicol_context.percentage_values	Firefox	6/26/2018	Safari	9/17/2018	83
css.properties.gap.grid_context 📋	Firefox	6/26/2018	Safari	9/17/2018	83
css.properties.row-gap.grid_context 📋	Firefox	6/26/2018	Safari	9/17/2018	83
css.at-rules.font-face.font-stretch 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.at-rules.font-face.src.format_variations	Safari	9/19/2017	Firefox	9/5/2018	351
css.properties.font-variation-settings 📋	Safari	9/19/2017	Firefox	9/5/2018	351	Safari: Requires macOS 10.13 High Sierra or later.Safari on iOS: Requires iOS 11 or later.WebView on iOS: Requires iOS 11 or later.
css.properties.shape-image-threshold 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-margin 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.circle	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.gradient 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.image 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.inset	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.none 📋	Safari	3/27/2017	Firefox	9/5/2018	527
css.properties.shape-outside.polygon	Safari	3/27/2017	Firefox	9/5/2018	527
css.selectors.selection 📋	Safari	10/24/2003	Firefox	9/5/2018	5430

2018/6

API	First Browser	Date	Last Browser	Date	Days
css.properties.font-stretch.percentage	Safari	4/12/2018	Firefox	6/26/2018	75
css.properties.font-style.oblique-angle 📋	Safari	4/12/2018	Firefox	6/26/2018	75
css.properties.font-weight.number	Safari	9/19/2017	Firefox	6/26/2018	280

2018/5

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.paint-order 📋	Safari	9/19/2017	Firefox	5/9/2018	232	Chrome: Does not affect stroked HTML text, see bug 41372165Chrome Android: Does not affect stroked HTML text, see bug 41372165Edge: Does not affect stroked HTML text, see bug 41372165Quest Browser: Does not affect stroked HTML text, see bug 41372165Opera: Does not affect stroked HTML text, see bug 41372165Opera Android: Does not affect stroked HTML text, see bug 41372165Safari: Does not affect stroked HTML text, see bug 168601Safari on iOS: Does not affect stroked HTML text, see bug 168601Samsung Internet: Does not affect stroked HTML text, see bug 41372165WebView Android: Does not affect stroked HTML text, see bug 41372165WebView on iOS: Does not affect stroked HTML text, see bug 168601

2018/4

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.font-face.OpenType_COLRv0	Firefox	7/22/2014	Safari	4/12/2018	1360
css.at-rules.font-face.font-display 📋	Firefox	1/23/2018	Safari	4/12/2018	79
css.properties.caret-color 📋	Firefox	4/19/2017	Safari	4/12/2018	358
css.properties.display.contents 📋	Firefox	3/31/2015	Safari	4/12/2018	1108

2018/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.position.position_sticky_table_elements	Safari	10/16/2014	Firefox	3/13/2018	1244	Firefox: Borders do not display on table headers if `border-collapse` is set to `collapse` (bug 1727594).Firefox for Android: Borders do not display on table headers if `border-collapse` is set to `collapse` (bug 1727594).
css.selectors.placeholder-shown.non_text_types	Safari	9/30/2015	Firefox	3/13/2018	895

2017/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.align-content.flex_context.first_baseline	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.align-content.flex_context.last_baseline	Firefox	3/7/2017	Safari	9/19/2017	196	Safari: This value is recognized, but has no effect. See bug 235005.Safari on iOS: This value is recognized, but has no effect. See bug 235005.WebView on iOS: This value is recognized, but has no effect. See bug 235005.
css.properties.align-content.flex_context.space-evenly	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.align-items.flex_context.first_baseline	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.align-items.grid_context.start_end	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.align-self.flex_context.first_baseline	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.cursor.grab	Firefox	2/4/2014	Safari	9/19/2017	1323	Chrome: Chrome also continues to support the prefixed versions.Chrome: Chrome 22 added Windows support.Chrome Android: Chrome Android also continues to support the prefixed versions.Chrome Android: Chrome Android 25 added Windows support.Quest Browser: Quest Browser also continues to support the prefixed versions.Quest Browser: Quest Browser 5.0 added Windows support.Opera: Opera also continues to support the prefixed versions.Opera: Opera 22 added Windows support.Opera Android: Opera also continues to support the prefixed versions.Opera Android: Opera 22 added Windows support.Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView Android: WebView Android also continues to support the prefixed versions.WebView Android: WebView Android 4.4 added Windows support.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.grabbing 📋	Firefox	2/4/2014	Safari	9/19/2017	1323	Chrome: Chrome 22 added Windows support.Chrome Android: Chrome Android 25 added Windows support.Edge: Edge 79 added Windows support.Quest Browser: Quest Browser 5.0 added Windows support.Opera: Opera 15 added Windows support.Opera Android: Opera Android 14 added Windows support.Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.Samsung Internet: Samsung Internet 1.5 added Windows support.WebView Android: WebView Android 4.4 added Windows support.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.font.font_stretch_support	Firefox	12/15/2015	Safari	9/19/2017	644
css.properties.font-stretch 📋	Firefox	12/20/2011	Safari	9/19/2017	2100	Chrome: A `font-stretch` definition must be added to the `@font-face` before this property will function.Chrome Android: A `font-stretch` definition must be added to the `@font-face` before this property will function.Quest Browser: A `font-stretch` definition must be added to the `@font-face` before this property will function.Opera: A `font-stretch` definition must be added to the `@font-face` before this property will function.Opera Android: A `font-stretch` definition must be added to the `@font-face` before this property will function.Samsung Internet: A `font-stretch` definition must be added to the `@font-face` before this property will function.WebView Android: A `font-stretch` definition must be added to the `@font-face` before this property will function.
css.properties.gap.grid_context.percentage_values	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.justify-content.flex_context.space-evenly	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.place-content.grid_context	Firefox	4/19/2017	Safari	9/19/2017	153	Firefox: Starting with version 60, you can only specify a single value if it is valid for both `align-content` and `justify-content`.Firefox for Android: Starting with version 60, you can only specify a single value if it is valid for both `align-content` and `justify-content`.
css.properties.place-items 📋	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.place-items.flex_context	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.place-items.grid_context	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.place-self 📋	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.place-self.flex_context	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.place-self.grid_context	Firefox	3/8/2016	Safari	9/19/2017	560
css.properties.position.absolutely_positioned_flex_children	Firefox	3/7/2017	Safari	9/19/2017	196
css.properties.transform-box 📋	Firefox	8/8/2017	Safari	9/19/2017	42
css.properties.unicode-bidi.isolate 📋	Firefox	11/15/2016	Safari	9/19/2017	308	Chrome: Before Chrome 47, `-webkit-isolate` could lock up the browser.Chrome: Since Chrome 19, the syntax from a previous version of the specification, where the `isolate` keyword could be used together with `bidi-override`, is allowed.Firefox: From Firefox 10 to Firefox 16 (inclusive), the `isolate` keyword could be used together with `bidi-override`, which was the syntax from a previous version of the specification. From Firefox 17, only one value is allowed. Use `isolate-override` instead the previous `isolate bidi-override`.Firefox for Android: From Firefox for Android 10 to Firefox for Android 16 (inclusive), the `isolate` keyword could be used together with `bidi-override`, which was the syntax from a previous version of the specification. From Firefox for Android 17, only one value is allowed. Use `isolate-override` instead the previous `isolate bidi-override`.Opera: Before Opera 34, `-webkit-isolate` could lock up the browser.Opera: Since Opera 15, the syntax from a previous version of the specification, where the `isolate` keyword could be used together with `bidi-override`, is allowed.Safari: Before Safari 9, `-webkit-isolate` could lock up the browser.Safari on iOS: Before Safari on iOS 9, `-webkit-isolate` could lock up the browser.WebView on iOS: Before WebView on iOS 9, `-webkit-isolate` could lock up the browser.
css.properties.unicode-bidi.isolate-override 📋	Firefox	11/15/2016	Safari	9/19/2017	308
css.properties.unicode-bidi.plaintext 📋	Firefox	11/15/2016	Safari	9/19/2017	308	Firefox: Before Firefox 50, the `plaintext` value was ignored for vertical writing modes (bug 1302734).Firefox: Before Firefox 15, `plaintext` didn't do anything to an inline element. The specification changed and the implementation was changed in Firefox 15.Firefox for Android: Before Firefox for Android 50, the `plaintext` value was ignored for vertical writing modes (bug 1302734).Firefox for Android: Before Firefox for Android 15, `plaintext` didn't do anything to an inline element. The specification changed and the implementation was changed in Firefox for Android 15.
css.types.calc.nested	Firefox	8/2/2016	Safari	9/19/2017	413

2017/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.cue 📋	Safari	10/22/2013	Firefox	8/8/2017	1386	Firefox: From Firefox 69, only allowed properties apply to the `::cue` pseudo-element with no argument. See Permitted properties for a list of the allowed properties.
css.types.gradient.linear-gradient.unitless_0_angle	Safari	10/22/2013	Firefox	8/8/2017	1386	Firefox: Accepted only in `-webkit-linear-gradient()` and `-moz-linear-gradient()`, not `linear-gradient()`.Firefox for Android: Accepted only in `-webkit-linear-gradient()` and `-moz-linear-gradient()`, not `linear-gradient()`.
css.types.gradient.repeating-linear-gradient.unitless_0_angle	Safari	10/22/2013	Firefox	8/8/2017	1386	Firefox: Accepted only in `-webkit-repeating-linear-gradient()` and `-moz-repeating-linear-gradient()`, not `repeating-linear-gradient()`.Firefox for Android: Accepted only in `-webkit-repeating-linear-gradient()` and `-moz-repeating-linear-gradient()`, not `repeating-linear-gradient()`.

2017/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.appearance.none 📋	Safari	10/26/2007	Firefox	6/13/2017	3518	Firefox: Doesn't work with `<input type="checkbox">` and `<input type="radio">`.Firefox for Android: Doesn't work with `<input type="checkbox">` and `<input type="radio">`.
css.properties.clip-path.basic_shape 📋	Safari	10/22/2013	Firefox	6/13/2017	1330
css.types.basic-shape 📋	Safari	3/27/2017	Firefox	6/13/2017	78
css.types.basic-shape.animation	Safari	3/27/2017	Firefox	6/13/2017	78
css.types.basic-shape.circle 📋	Safari	3/27/2017	Firefox	6/13/2017	78
css.types.basic-shape.ellipse 📋	Safari	3/27/2017	Firefox	6/13/2017	78
css.types.basic-shape.inset 📋	Safari	3/27/2017	Firefox	6/13/2017	78
css.types.basic-shape.polygon 📋	Safari	3/27/2017	Firefox	6/13/2017	78

2017/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.mask-image.multiple_mask_images	Safari	6/8/2009	Firefox	4/19/2017	2872
css.properties.mask-image.svg_masks	Safari	6/8/2009	Firefox	4/19/2017	2872

2017/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.keyframes.ignore_important_declarations	Firefox	2/19/2013	Safari	3/27/2017	1497
css.properties.align-content.grid_context 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.align-items.grid_context 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.align-self.grid_context 📋	Firefox	3/7/2017	Safari	3/27/2017	20	Internet Explorer: Internet Explorer 10 and 11 have the property `-ms-grid-row-align`, which acts in a similar way to `align-self`.
css.properties.display.grid	Firefox	3/7/2017	Safari	3/27/2017	20	Internet Explorer: Internet Explorer implements an older version of the specification.Samsung Internet: Samsung Internet added this earlier than the corresponding Chrome version would indicate.
css.properties.display.inline-grid	Firefox	3/7/2017	Safari	3/27/2017	20	Internet Explorer: Internet Explorer implements an older version of the specification.Samsung Internet: Samsung Internet added this earlier than the corresponding Chrome version would indicate.
css.properties.gap 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid 📋	Firefox	3/7/2017	Safari	3/27/2017	20	Samsung Internet: This was added early so is out of sync with the equivalent Chromium version.
css.properties.grid-area 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-auto-flow 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-auto-flow.column 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-auto-flow.dense 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-auto-flow.row 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-column 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-column-end 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-column-start 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-row 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-row-end 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-row-start 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template.none 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-areas 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-areas.none 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.auto 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.fit-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.max-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.min-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.minmax 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-columns.none 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.auto 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.fit-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.max-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.min-content 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.minmax 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.grid-template-rows.none 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.justify-content.grid_context 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.justify-items.grid_context 📋	Firefox	3/8/2016	Safari	3/27/2017	384
css.properties.justify-self 📋	Firefox	3/8/2016	Safari	3/27/2017	384
css.properties.justify-self.grid_context 📋	Firefox	3/8/2016	Safari	3/27/2017	384	Internet Explorer: Internet Explorer 10 and 11 have the property `-ms-grid-column-align`, which acts in a similar way to `justify-self`.
css.properties.row-gap 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.properties.writing-mode 📋	Firefox	9/22/2015	Safari	3/27/2017	552	Firefox: Firefox 42 added support for bidirectional and RTL scripts in vertical modes.Firefox for Android: Firefox for Android 42 added support for bidirectional and RTL scripts in vertical modes.Internet Explorer: Internet Explorer's implementation differs from the specification.Internet Explorer: Internet Explorer's implementation differs from the specification.
css.properties.writing-mode.lr	Firefox	12/15/2015	Safari	3/27/2017	468
css.properties.writing-mode.lr-tb	Firefox	12/15/2015	Safari	3/27/2017	468
css.properties.writing-mode.rl	Firefox	12/15/2015	Safari	3/27/2017	468
css.properties.writing-mode.rl-tb	Firefox	12/15/2015	Safari	3/27/2017	468
css.properties.writing-mode.tb	Firefox	12/15/2015	Safari	3/27/2017	468
css.properties.writing-mode.tb-rl	Firefox	12/15/2015	Safari	3/27/2017	468
css.selectors.focus-within 📋	Firefox	3/7/2017	Safari	3/27/2017	20
css.selectors.placeholder 📋	Firefox	1/24/2017	Safari	3/27/2017	62
css.types.flex 📋	Firefox	8/11/2015	Safari	3/27/2017	594
css.types.number.scientific_notation	Firefox	4/29/2014	Safari	3/27/2017	1063
css.properties.align-content.flex_context.stretch	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.align-self.flex_context.stretch	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.clip-path.svg_elements	Safari	10/22/2013	Firefox	3/7/2017	1232
css.properties.column-count 📋	Safari	9/30/2015	Firefox	3/7/2017	524	Firefox: Before version 37, multiple columns didn't work with `display: table-caption` elements.Firefox for Android: Before version 37, multiple columns didn't work with `display: table-caption` elements.
css.properties.column-fill 📋	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.column-gap.multicol_context 📋	Safari	9/20/2016	Firefox	3/7/2017	168	Firefox: Before Firefox 3, the default value for the `normal` keyword was `0` and not `1em`.
css.properties.column-rule 📋	Safari	9/30/2015	Firefox	3/7/2017	524	Firefox: Before Firefox 3, the default value for the `normal` keyword was `0` and not `1em`.
css.properties.column-rule-color 📋	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.column-rule-style 📋	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.column-rule-width 📋	Safari	9/30/2015	Firefox	3/7/2017	524
css.properties.columns 📋	Safari	9/30/2015	Firefox	3/7/2017	524	Firefox: Before version 37, multiple columns didn't work with `display: table-caption` elements.Firefox for Android: Before version 37, multiple columns didn't work with `display: table-caption` elements.
css.properties.justify-content.flex_context.left_right	Safari	9/30/2015	Firefox	3/7/2017	524	Internet Explorer: This value is recognized, but has no effect.Opera Android: This value is recognized, but has no effect.
css.properties.justify-content.flex_context.stretch	Safari	9/30/2015	Firefox	3/7/2017	524

2017/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.indeterminate.radio	Safari	9/20/2016	Firefox	1/24/2017	126
css.selectors.placeholder-shown 📋	Safari	9/30/2015	Firefox	1/24/2017	482

2016/11

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.border-image-repeat.space 📋	Safari	3/21/2016	Firefox	11/15/2016	239
css.properties.column-width 📋	Safari	9/30/2015	Firefox	11/15/2016	412	Firefox: Before version 37, multiple columns didn't work with `display: table-caption` elements.Firefox for Android: Before version 37, multiple columns didn't work with `display: table-caption` elements.
css.selectors.any-link 📋	Safari	9/30/2015	Firefox	11/15/2016	412

2016/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.font-face.WOFF_2 📋	Firefox	7/2/2015	Safari	9/20/2016	446	Safari: Supported only on macOS 10.12 (Sierra) and later.
css.at-rules.font-face.font-feature-settings 📋	Firefox	12/1/2014	Safari	9/20/2016	659	Firefox: The ISO/IEC CD 14496-22 3rd edition suggests using the `ssty` feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the `dtls` feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS.Firefox: From Firefox 4 to Firefox 14 (inclusive), Firefox supported an older, slightly different syntax. See OpenType Font Feature support in Firefox 4.Firefox for Android: The ISO/IEC CD 14496-22 3rd edition suggests using the `ssty` feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox for Android 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the `dtls` feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox for Android 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS.Firefox for Android: From Firefox for Android 4 to Firefox for Android 14 (inclusive), Firefox for Android supported an older, slightly different syntax. See OpenType Font Feature support in Firefox for Android 4.
css.at-rules.media.-webkit-transform-3d 📋	Safari	6/8/2009	Firefox	9/20/2016	2661
css.properties.-webkit-mask-position-x	Safari	3/18/2008	Firefox	9/20/2016	3108
css.properties.-webkit-mask-position-y	Safari	3/18/2008	Firefox	9/20/2016	3108
css.properties.-webkit-text-fill-color 📋	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.-webkit-text-stroke 📋	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.-webkit-text-stroke-color 📋	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.-webkit-text-stroke-width 📋	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.background-position-x 📋	Safari	6/23/2003	Firefox	9/20/2016	4838
css.properties.background-position-y 📋	Safari	6/23/2003	Firefox	9/20/2016	4838
css.properties.background-repeat.round 📋	Safari	10/16/2014	Firefox	9/20/2016	705
css.properties.background-repeat.space 📋	Safari	10/16/2014	Firefox	9/20/2016	705
css.properties.box-align	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.box-direction	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.box-flex	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.box-ordinal-group	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.box-orient	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.box-pack	Safari	10/26/2007	Firefox	9/20/2016	3252
css.properties.object-fit 📋	Firefox	2/24/2015	Safari	9/20/2016	574	Edge: Only supported for `<img>` elements.
css.properties.object-fit.contain 📋	Firefox	2/24/2015	Safari	9/20/2016	574
css.properties.object-fit.cover 📋	Firefox	2/24/2015	Safari	9/20/2016	574
css.properties.object-fit.fill 📋	Firefox	2/24/2015	Safari	9/20/2016	574
css.properties.object-fit.none 📋	Firefox	2/24/2015	Safari	9/20/2016	574
css.properties.object-fit.scale-down 📋	Firefox	2/24/2015	Safari	9/20/2016	574
css.properties.object-position 📋	Firefox	2/24/2015	Safari	9/20/2016	574	Edge: Only supported for `<img>` elements.
css.properties.overflow-wrap 📋	Safari	10/22/2013	Firefox	9/20/2016	1064
css.types.color.rgb_hexadecimal_notation.alpha_hexadecimal_notation	Firefox	9/20/2016	Safari	9/20/2016

2016/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.types.calc.number_values	Safari	7/25/2012	Firefox	8/2/2016	1469

2016/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.selectors.attribute.case_insensitive_modifier	Safari	9/30/2015	Firefox	6/7/2016	251

2016/4

API	First Browser	Date	Last Browser	Date	Days
css.properties.text-emphasis 📋	Safari	10/22/2013	Firefox	4/26/2016	917
css.properties.text-emphasis-color 📋	Safari	10/22/2013	Firefox	4/26/2016	917
css.properties.text-emphasis-position 📋	Safari	10/22/2013	Firefox	4/26/2016	917
css.properties.text-emphasis-position.left	Safari	10/16/2014	Firefox	4/26/2016	558
css.properties.text-emphasis-position.right	Safari	10/16/2014	Firefox	4/26/2016	558
css.properties.text-emphasis-style 📋	Safari	10/22/2013	Firefox	4/26/2016	917

2016/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.font-feature-values 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.annotation	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.character-variant	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.historical-forms	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.ornaments	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.styleset	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.stylistic	Firefox	12/1/2014	Safari	3/21/2016	476
css.at-rules.font-feature-values.swash	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.all 📋	Firefox	2/4/2014	Safari	3/21/2016	776
css.properties.border-image-repeat.round 📋	Firefox	8/28/2012	Safari	3/21/2016	1301
css.properties.clip-path 📋	Firefox	6/30/2009	Safari	3/21/2016	2456	Edge: Only supports clip paths defined by `url()`.Internet Explorer: Only supports clip paths defined by `url()`.
css.properties.custom-property 📋	Firefox	7/22/2014	Safari	3/21/2016	608
css.properties.custom-property.var 📋	Firefox	7/22/2014	Safari	3/21/2016	608
css.properties.filter 📋	Firefox	1/13/2015	Safari	3/21/2016	433	Chrome: In Chrome 18 to 19, the `saturate()` function only takes integers instead of decimal or percentage values. From Chrome 20, this bug is fixed.Internet Explorer: Internet Explorer 4 to 9 implemented a non-standard `filter` property. The syntax was completely different from this one and is not documented here.
css.properties.font-feature-settings 📋	Firefox	12/1/2014	Safari	3/21/2016	476	Firefox: The ISO/IEC CD 14496-22 3rd edition suggests using the `ssty` feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the `dtls` feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS.Firefox: From Firefox 129 the `-webkit-font-feature-settings` alias has been added to support sites that are still supporting the vendor prefix.Firefox: From Firefox 4 to Firefox 14 (inclusive), Firefox supported an older, slightly different syntax. See OpenType Font Feature support in Firefox 4.Firefox for Android: The ISO/IEC CD 14496-22 3rd edition suggests using the `ssty` feature to provide glyph variants more suitable for use in scripts (for example primes used as superscripts). Starting with Firefox for Android 29, this is done automatically by the MathML rendering engine. The ISO/IEC CD 14496-22 3rd edition also suggests applying the `dtls` feature to letters when placing mathematical accents to get dotless forms (for example dotless i, j with a hat). Starting with Firefox for Android 35, this is done automatically by the MathML rendering engine. You can override the default values determined by the MathML rendering engine with CSS.Firefox for Android: From Firefox for Android 129 the `-webkit-font-feature-settings` alias has been added to support sites that are still supporting the vendor prefix.Firefox for Android: From Firefox for Android 4 to Firefox for Android 14 (inclusive), Firefox for Android supported an older, slightly different syntax. See OpenType Font Feature support in Firefox for Android 4.
css.properties.font-feature-settings.normal 📋	Firefox	8/28/2012	Safari	3/21/2016	1301
css.properties.font-variant.css_fonts_shorthand	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant.historical-forms 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant.sub 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant.super 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-alternates 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.all-petite-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.all-small-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.normal 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.petite-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.small-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.titling-caps 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-caps.unicase 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.full-width 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.jis04 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.jis78 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.jis83 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.jis90 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.normal 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.proportional-width 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.ruby 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.simplified 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-east-asian.traditional 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-ligatures 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.diagonal-fractions 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.lining-nums 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.normal 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.oldstyle-nums 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.ordinal 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.proportional-nums 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.slashed-zero 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.stacked-fractions 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-numeric.tabular-nums 📋	Firefox	12/1/2014	Safari	3/21/2016	476
css.properties.font-variant-position 📋	Firefox	12/1/2014	Safari	3/21/2016	476	Chrome: The property is recognized, but has no effect.Chrome Android: The property is recognized, but has no effect.Edge: The property is recognized, but has no effect.Quest Browser: The property is recognized, but has no effect.Opera: The property is recognized, but has no effect.Opera Android: The property is recognized, but has no effect.Samsung Internet: The property is recognized, but has no effect.WebView Android: The property is recognized, but has no effect.
css.properties.hyphens.language_croatian	Firefox	11/8/2011	Safari	3/21/2016	1595
css.properties.hyphens.language_finnish	Firefox	11/8/2011	Safari	3/21/2016	1595
css.properties.hyphens.language_hungarian	Firefox	12/20/2011	Safari	3/21/2016	1553
css.properties.hyphens.language_polish	Firefox	7/22/2014	Safari	3/21/2016	608
css.properties.hyphens.language_portuguese	Firefox	11/8/2011	Safari	3/21/2016	1595
css.properties.hyphens.language_ukrainian	Firefox	12/20/2011	Safari	3/21/2016	1553
css.properties.will-change 📋	Firefox	2/24/2015	Safari	3/21/2016	391
css.properties.will-change.auto 📋	Firefox	2/24/2015	Safari	3/21/2016	391
css.properties.will-change.contents 📋	Firefox	2/24/2015	Safari	3/21/2016	391
css.properties.will-change.scroll-position 📋	Firefox	2/24/2015	Safari	3/21/2016	391
css.types.global_keywords.unset 📋	Firefox	2/4/2014	Safari	3/21/2016	776
css.properties.align-content.flex_context.baseline	Safari	9/30/2015	Firefox	3/8/2016	160
css.properties.place-content 📋	Safari	9/30/2015	Firefox	3/8/2016	160
css.properties.place-content.flex_context	Safari	9/30/2015	Firefox	3/8/2016	160	Firefox: Starting with version 60, you can only specify a single value if it is valid for both `align-content` and `justify-content`.Firefox for Android: Starting with version 60, you can only specify a single value if it is valid for both `align-content` and `justify-content`.
css.properties.word-spacing.percentages	Safari	10/22/2013	Firefox	3/8/2016	868

2016/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.text-orientation.sideways 📋	Safari	10/22/2013	Firefox	1/26/2016	826

2015/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.transform-origin.svg_elements	Safari	7/25/2012	Firefox	12/15/2015	1238	Firefox: Keywords and percentages refer to the canvas instead of the object itself. See bug 1209061.Firefox for Android: Keywords and percentages refer to the canvas instead of the object itself. See bug 1209061.Safari: Only supported for transformations applied using the CSS `transform` property (e.g. `.className { transform: rotate(45deg); transform-origin: center; }`). It has no effect on transformations applied using the `transform` SVG attribute (e.g. `<rect style="transform-origin: center;" transform="rotate(45)" />`).Safari on iOS: Only supported for transformations applied using the CSS `transform` property (e.g. `.className { transform: rotate(45deg); transform-origin: center; }`). It has no effect on transformations applied using the `transform` SVG attribute (e.g. `<rect style="transform-origin: center;" transform="rotate(45)" />`).WebView on iOS: Only supported for transformations applied using the CSS `transform` property (e.g. `.className { transform: rotate(45deg); transform-origin: center; }`). It has no effect on transformations applied using the `transform` SVG attribute (e.g. `<rect style="transform-origin: center;" transform="rotate(45)" />`).
css.properties.writing-mode.horizontal-tb	Safari	9/30/2015	Firefox	12/15/2015	76
css.properties.writing-mode.vertical-lr	Safari	9/30/2015	Firefox	12/15/2015	76
css.properties.writing-mode.vertical-rl	Safari	9/30/2015	Firefox	12/15/2015	76

2015/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.keyframes 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.at-rules.supports 📋	Firefox	6/25/2013	Safari	9/30/2015	827
css.properties.align-content 📋	Firefox	3/18/2014	Safari	9/30/2015	561
css.properties.align-content.flex_context 📋	Firefox	3/18/2014	Safari	9/30/2015	561
css.properties.align-items 📋	Firefox	4/2/2013	Safari	9/30/2015	911
css.properties.align-self 📋	Firefox	4/2/2013	Safari	9/30/2015	911
css.properties.animation 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	WebView Android: The `animation-fill-mode` property is not supported in Android browsers below 2.3.
css.properties.animation-delay 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	Firefox: Before Firefox 57, Firefox does not repaint elements outside the viewport that are animated into the viewport with a delay. This bug affects only some platforms, such as Windows.
css.properties.animation-direction 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.animation-duration 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	Internet Explorer: Once the element has loaded, changing the value of this property has no effect.
css.properties.animation-fill-mode 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.animation-iteration-count 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.animation-name 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.animation-play-state 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.animation-timing-function 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.color-interpolation-filters.linearRGB 📋	Firefox	6/25/2013	Safari	9/30/2015	827
css.properties.color-interpolation-filters.sRGB 📋	Firefox	6/25/2013	Safari	9/30/2015	827
css.properties.counter-increment.list-item 📋	Firefox	11/9/2004	Safari	9/30/2015	3977
css.properties.counter-reset.list-item 📋	Firefox	11/9/2004	Safari	9/30/2015	3977	Chrome: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.Chrome Android: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.Quest Browser: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.Opera: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.Opera Android: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.Safari: Overriding the initial value of the implicit `list-item` counter results in incorrect values for the `counter()` function used to generate content, as it is not fully implemented; see bug 260436.Safari on iOS: Overriding the initial value of the implicit `list-item` counter results in incorrect values for the `counter()` function used to generate content, as it is not fully implemented; see bug 260436.Samsung Internet: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.WebView Android: Overriding the initial value of the implicit `list-item` counter has no effect when the default marker string for list items (`::marker`) is generated; see bug 338233131.WebView on iOS: Overriding the initial value of the implicit `list-item` counter results in incorrect values for the `counter()` function used to generate content, as it is not fully implemented; see bug 260436.
css.properties.cursor.zoom-in 📋	Firefox	9/17/2013	Safari	9/30/2015	743	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.zoom-out 📋	Firefox	9/17/2013	Safari	9/30/2015	743	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.display.flex	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Firefox 28 added multi-line flexbox support.Firefox for Android: Firefox for Android 28 added multi-line flexbox support.Internet Explorer: IE incorrectly positions inline block content inside flex containers. See the discussion on Microsoft Answers.Internet Explorer: IE incorrectly positions inline block content inside flex containers. See the discussion on Microsoft Answers.
css.properties.display.inline-flex	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Firefox 28 added multi-line flexbox support.Firefox for Android: Firefox for Android 28 added multi-line flexbox support.
css.properties.flex 📋	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox: Before Firefox 32, Firefox wasn't able to animate values starting or stopping at `0`.Firefox: Until Firefox 61, flex items that are sized according to their content are sized using `fit-content`, not `max-content`.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.Firefox for Android: Before Firefox for Android 32, Firefox for Android wasn't able to animate values starting or stopping at `0`.Firefox for Android: Until Firefox for Android 61, flex items that are sized according to their content are sized using `fit-content`, not `max-content`.Internet Explorer: Internet Explorer 11 ignores uses of `calc()` in the `flex-basis` part of the `flex` syntax. This can be worked around by using the longhand properties instead of the shorthand. See Flexbug #8 for more info.Internet Explorer: Internet Explorer 11 considers a unitless value in the `flex-basis` part to be syntactically invalid (and will thus be ignored). A workaround is to always include a unit in the `flex-basis` part of the `flex` shorthand value. See Flexbug #4 for more info.Internet Explorer: Internet Explorer 10 and 11 ignore uses of `calc()` in the `flex-basis` part of the `flex` syntax. This can be worked around by using the longhand properties instead of the shorthand. See Flexbug #8 for more info.Internet Explorer: Internet Explorer 10 and 11 consider a unitless value in the `flex-basis` part to be syntactically invalid (and will thus be ignored). A workaround is to always include a unit in the `flex-basis` part of the `flex` shorthand value. See Flexbug #4 for more info.
css.properties.flex-basis 📋	Firefox	6/25/2013	Safari	9/30/2015	827	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.Internet Explorer: When a non-`auto` `flex-basis` is specified, Internet Explorer 10 and 11 always uses a `content-box` box model to calculate the size of a flex item, even if `box-sizing: border-box` is applied to the element. See Flexbug #7 for more info.
css.properties.flex-basis.auto	Firefox	6/25/2013	Safari	9/30/2015	827
css.properties.flex-direction 📋	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.
css.properties.flex-flow 📋	Firefox	3/18/2014	Safari	9/30/2015	561
css.properties.flex-grow 📋	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.
css.properties.flex-shrink 📋	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox: Before Firefox 32, Firefox wasn't able to animate values starting or stopping at `0`.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.Firefox for Android: Before Firefox for Android 32, Firefox for Android wasn't able to animate values starting or stopping at `0`.Internet Explorer: Internet Explorer 10 uses `0` instead of `1` as the initial value for the `flex-shrink` property. A workaround is to always set an explicit value for `flex-shrink`. See Flexbug #6 for more info.
css.properties.flex-wrap 📋	Firefox	3/18/2014	Safari	9/30/2015	561	Internet Explorer: Partial support due to large number of bugs present. See Flexbugs.
css.properties.font-kerning 📋	Firefox	9/2/2014	Safari	9/30/2015	393
css.properties.font-synthesis 📋	Firefox	12/1/2014	Safari	9/30/2015	303
css.properties.font-variant.none 📋	Firefox	12/1/2014	Safari	9/30/2015	303
css.properties.justify-content 📋	Firefox	4/2/2013	Safari	9/30/2015	911
css.properties.justify-items 📋	Firefox	4/2/2013	Safari	9/30/2015	911
css.properties.justify-items.flex_context 📋	Firefox	4/2/2013	Safari	9/30/2015	911
css.properties.order 📋	Firefox	4/2/2013	Safari	9/30/2015	911	Firefox: Since Firefox 28, multi-line flexbox is supported.Firefox for Android: Since Firefox for Android 28, multi-line flexbox is supported.
css.properties.perspective 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	Safari on iOS: In iOS 13, the `perspective` property did not function properly. The issues were fixed in iOS 14.WebView on iOS: In iOS 13, the `perspective` property did not function properly. The issues were fixed in iOS 14.
css.properties.perspective-origin 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.quotes 📋	Firefox	11/29/2005	Safari	9/30/2015	3592
css.properties.quotes.none 📋	Firefox	11/29/2005	Safari	9/30/2015	3592
css.properties.transform 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	Internet Explorer: Internet Explorer does not support the global values `initial` and `unset`.Internet Explorer: Internet Explorer 5.5 or later supports a proprietary Matrix Filter which can be used to achieve a similar effect.WebView Android: Android 2.3 has a bug where input forms will "jump" when typing, if any container element has a `-webkit-transform`.
css.properties.transform-origin 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.transform-style 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.transition 📋	Firefox	10/9/2012	Safari	9/30/2015	1086	Firefox: Before Firefox 57, transitions do not work when transitioning from a `text-shadow` with a color specified to a `text-shadow` without a color specified (see bug 726550).Firefox: Before Firefox 57, cancelling a filling animation (for example, with `animation-fill-mode: forwards` set) can trigger a transition set on the same element, although only once (see bug 1192592 and these test cases for more information).Firefox: Before Firefox 57, the `background-position` property can't be transitioned between two values containing different numbers of `<position>` values, for example `background-position: 10px 10px;` and `background-position: 20px 20px, 30px 30px;` (see bug 1390446).Firefox for Android: Before Firefox for Android 57, transitions do not work when transitioning from a `text-shadow` with a color specified to a `text-shadow` without a color specified (see bug 726550).Firefox for Android: Before Firefox for Android 57, cancelling a filling animation (for example, with `animation-fill-mode: forwards` set) can trigger a transition set on the same element, although only once (see bug 1192592 and these test cases for more information).Firefox for Android: Before Firefox for Android 57, the `background-position` property can't be transitioned between two values containing different numbers of `<position>` values, for example `background-position: 10px 10px;` and `background-position: 20px 20px, 30px 30px;` (see bug 1390446).
css.properties.transition-delay 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.transition-duration 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.transition-property 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.transition-timing-function 📋	Firefox	10/9/2012	Safari	9/30/2015	1086
css.properties.word-break.keep-all 📋	Firefox	8/28/2012	Safari	9/30/2015	1128
css.selectors.invalid.form	Firefox	6/5/2012	Safari	9/30/2015	1212
css.selectors.valid.form	Firefox	6/5/2012	Safari	9/30/2015	1212
css.types.color.named-color.rebeccapurple	Firefox	10/14/2014	Safari	9/30/2015	351

2015/2

API	First Browser	Date	Last Browser	Date	Days
css.at-rules.font-face.unicode-range 📋	Safari	3/18/2008	Firefox	2/24/2015	2534
css.properties.isolation 📋	Safari	10/16/2014	Firefox	2/24/2015	131
css.properties.white-space.textarea_support	Safari	6/23/2003	Firefox	2/24/2015	4264
css.types.gradient.linear-gradient.interpolation_hints	Safari	10/22/2013	Firefox	2/24/2015	490
css.types.gradient.radial-gradient.interpolation_hints	Safari	10/22/2013	Firefox	2/24/2015	490
css.types.gradient.repeating-linear-gradient.interpolation_hints	Safari	10/22/2013	Firefox	2/24/2015	490
css.types.gradient.repeating-radial-gradient.interpolation_hints	Safari	10/22/2013	Firefox	2/24/2015	490

2015/1

API	First Browser	Date	Last Browser	Date	Days
css.properties.mask-type 📋	Safari	10/22/2013	Firefox	1/13/2015	448
css.properties.mask-type.alpha 📋	Safari	10/22/2013	Firefox	1/13/2015	448
css.properties.mask-type.luminance 📋	Safari	10/22/2013	Firefox	1/13/2015	448
css.types.filter-function 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.blur 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.brightness 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.contrast 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.drop-shadow 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.grayscale 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.hue-rotate 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.invert 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.opacity 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.saturate 📋	Safari	7/25/2012	Firefox	1/13/2015	902
css.types.filter-function.sepia 📋	Safari	7/25/2012	Firefox	1/13/2015	902

2014/12

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.font-variant-ligatures.common-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.contextual 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.discretionary-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.historical-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.no-common-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.no-contextual 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.no-discretionary-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.no-historical-ligatures 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.none 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.font-variant-ligatures.normal 📋	Safari	10/22/2013	Firefox	12/1/2014	405
css.properties.min-height.auto	Safari	10/22/2013	Firefox	12/1/2014	405	Firefox: Firefox 18 and later used `auto` as the initial value for `min-height`.Firefox for Android: Firefox for Android 18 and later used `auto` as the initial value for `min-height`.
css.properties.min-width.auto	Safari	10/22/2013	Firefox	12/1/2014	405	Chrome: Chrome uses `auto` as the initial value for `min-width`.Chrome Android: Chrome Android uses `auto` as the initial value for `min-width`.Edge: Edge uses `auto` as the initial value for `min-width`.Firefox: Firefox 18 and later (until the value was removed), used `auto` as the initial value for `min-width`.Firefox for Android: Firefox for Android 18 and later (until the value was removed), used `auto` as the initial value for `min-width`.Quest Browser: Quest Browser uses `auto` as the initial value for `min-width`.Opera: Opera uses `auto` as the initial value for `min-width`.Opera Android: Opera Android uses `auto` as the initial value for `min-width`.Samsung Internet: Samsung Internet uses `auto` as the initial value for `min-width`.WebView Android: WebView Android uses `auto` as the initial value for `min-width`.

2014/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background-blend-mode 📋	Firefox	6/10/2014	Safari	10/16/2014	128
css.properties.column-fill.auto 📋	Firefox	11/20/2012	Safari	10/16/2014	695
css.properties.column-fill.balance 📋	Firefox	11/20/2012	Safari	10/16/2014	695
css.properties.font-variant.turkic_is	Firefox	7/17/2012	Safari	10/16/2014	821
css.properties.mix-blend-mode 📋	Firefox	9/2/2014	Safari	10/16/2014	44
css.properties.text-decoration.includes_color-and-style	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-decoration-line.blink 📋	Firefox	12/10/2013	Safari	10/16/2014	310	Chrome: The `blink` value does not have any effect.Chrome Android: The `blink` value does not have any effect.Edge: The `blink` value does not have any effect.Firefox: The `blink` value does not have any effect.Firefox for Android: The `blink` value does not have any effect.Quest Browser: The `blink` value does not have any effect.Samsung Internet: The `blink` value does not have any effect.WebView Android: The `blink` value does not have any effect.
css.properties.text-decoration-line.line-through 📋	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-decoration-line.none 📋	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-decoration-line.overline 📋	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-decoration-line.underline 📋	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-decoration-style.wavy	Firefox	8/16/2011	Safari	10/16/2014	1157
css.properties.text-transform.turkic_is	Firefox	7/17/2012	Safari	10/16/2014	821
css.types.blend-mode 📋	Firefox	6/10/2014	Safari	10/16/2014	128
css.properties.list-style-type.arabic-indic 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.bengali 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.cambodian 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.cjk-earthly-branch 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.cjk-heavenly-stem 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.devanagari 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.gujarati 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.gurmukhi 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.kannada 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.khmer 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.lao 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.lower-armenian 📋	Safari	7/20/2011	Firefox	10/14/2014	1182
css.properties.list-style-type.malayalam 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.mongolian 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.myanmar 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.oriya 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.persian 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.telugu 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.thai 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.tibetan 📋	Safari	6/7/2010	Firefox	10/14/2014	1590
css.properties.list-style-type.upper-armenian 📋	Safari	7/20/2011	Firefox	10/14/2014	1182
css.properties.list-style-type.urdu	Safari	6/7/2010	Firefox	10/14/2014	1590

2014/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.box-decoration-break 📋	Safari	10/22/2013	Firefox	9/2/2014	315	Chrome: This property is only supported for inline elements.Chrome Android: This property is only supported for inline elements.Edge: This property is only supported for inline elements.Quest Browser: This property is only supported for inline elements.Safari: This property is only supported for inline elements.Safari on iOS: This property is only supported for inline elements.Samsung Internet: This property is only supported for inline elements.WebView Android: This property is only supported for inline elements.WebView on iOS: This property is only supported for inline elements.
css.properties.box-decoration-break.clone 📋	Safari	10/22/2013	Firefox	9/2/2014	315	Chrome: This value was only supported with the -webkit- prefix.Chrome Android: This value was only supported with the -webkit- prefix.Edge: This value was only supported with the -webkit- prefix.Quest Browser: This value was only supported with the -webkit- prefix.Opera: This value was only supported with the -webkit- prefix.Opera Android: This value was only supported with the -webkit- prefix.Samsung Internet: This value was only supported with the -webkit- prefix.WebView Android: This value was only supported with the -webkit- prefix.
css.properties.box-decoration-break.slice 📋	Safari	10/22/2013	Firefox	9/2/2014	315	Chrome: This value was only supported with the -webkit- prefix.Chrome Android: This value was only supported with the -webkit- prefix.Edge: This value was only supported with the -webkit- prefix.Quest Browser: This value was only supported with the -webkit- prefix.Opera: This value was only supported with the -webkit- prefix.Opera Android: This value was only supported with the -webkit- prefix.Samsung Internet: This value was only supported with the -webkit- prefix.WebView Android: This value was only supported with the -webkit- prefix.
css.selectors.scope 📋	Safari	10/22/2013	Firefox	9/2/2014	315	Firefox: Firefox 55 removes support for `<style scoped>` but not for the `:scope` pseudo-class, which is still supported. `<style scoped>` made it possible to explicitly set up element scopes, but ongoing discussions about the design of this feature as well as lack of other implementations resulted in the decision to remove it.Firefox for Android: Firefox for Android 55 removes support for `<style scoped>` but not for the `:scope` pseudo-class, which is still supported. `<style scoped>` made it possible to explicitly set up element scopes, but ongoing discussions about the design of this feature as well as lack of other implementations resulted in the decision to remove it.
css.selectors.scope.dom_api	Safari	10/22/2013	Firefox	9/2/2014	315

2014/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.font-size.rem_values	Safari	10/22/2013	Firefox	7/22/2014	273	Firefox: Before Firefox 57, animations using em units are not affected by changes to the `font-size` of the animated element's parent (bug 1254424).Firefox: Before Firefox 57, some language settings' inherited `font-size` is smaller than expected (bug 1391341).

2014/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.border-image.gradient	Safari	6/8/2009	Firefox	4/29/2014	1786
css.properties.box-sizing 📋	Safari	7/20/2011	Firefox	4/29/2014	1014	Chrome: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Chrome Android: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Firefox: Before Firefox 23, `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Firefox for Android: Before Firefox for Android 23, `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Internet Explorer: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Quest Browser: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Opera Android: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.Samsung Internet: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.WebView Android: `box-sizing` is not respected when the height is calculated from `window.getComputedStyle()`.
css.selectors.in-range 📋	Safari	7/20/2011	Firefox	4/29/2014	1014	Chrome: Before Chrome 52, `:in-range` matched disabled and read-only inputs (see bug 41248615). In Chrome 52, it was changed to only match enabled read-write inputs.Chrome Android: Before Chrome Android 52, `:in-range` matched disabled and read-only inputs (see bug 41248615). In Chrome Android 52, it was changed to only match enabled read-write inputs.Firefox: Before Firefox 50, `:in-range` matched disabled and read-only inputs (see bug 1264157). In Firefox 50, it was changed to only match enabled read-write inputs.Quest Browser: Before Quest Browser 5.0, `:in-range` matched disabled and read-only inputs (see bug 41248615). In Quest Browser 5.0, it was changed to only match enabled read-write inputs.Opera: Before Opera 39, `:in-range` matched disabled and read-only inputs (see bug 41248615). In Opera 39, it was changed to only match enabled read-write inputs.Opera Android: Before Opera 39, `:in-range` matched disabled and read-only inputs (see bug 41248615). In Opera 39, it was changed to only match enabled read-write inputs.Safari: In Safari, `:in-range` matched disabled and read-only inputs (see bug 156530). It was later changed to only match enabled read-write inputs.Safari on iOS: In Safari on iOS, `:in-range` matched disabled and read-only inputs (see bug 156530). It was later changed to only match enabled read-write inputs.Samsung Internet: Before version 6.0, `:in-range` matched disabled and read-only inputs (see bug 41248615). In version 6.0, it was changed to only match enabled read-write inputs.WebView Android: Before version 52, `:in-range` matched disabled and read-only inputs (see bug 41248615). In version 52, it was changed to only match enabled read-write inputs.WebView on iOS: In WebView on iOS, `:in-range` matched disabled and read-only inputs (see bug 156530). It was later changed to only match enabled read-write inputs.
css.selectors.out-of-range 📋	Safari	7/20/2011	Firefox	4/29/2014	1014

2014/3

API	First Browser	Date	Last Browser	Date	Days
css.properties.align-items.flex_context.baseline	Safari	10/22/2013	Firefox	3/18/2014	147
css.properties.align-self.flex_context.baseline	Safari	10/22/2013	Firefox	3/18/2014	147
css.properties.flex-wrap.nowrap 📋	Safari	10/22/2013	Firefox	3/18/2014	147
css.properties.flex-wrap.wrap 📋	Safari	10/22/2013	Firefox	3/18/2014	147
css.properties.flex-wrap.wrap-reverse 📋	Safari	10/22/2013	Firefox	3/18/2014	147

2013/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.font-smooth	Safari	6/8/2009	Firefox	10/29/2013	1604	Firefox: Only works on macOS.
css.at-rules.media.nested-queries	Firefox	3/13/2012	Safari	10/22/2013	588
css.properties.align-items.flex_context 📋	Firefox	4/2/2013	Safari	10/22/2013	203	Chrome: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.Chrome Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome Android implements the new behavior beginning with Chrome Android 52.Firefox: Multi-line flexbox has been supported since Firefox 28.Firefox for Android: Multi-line flexbox has been supported since Firefox for Android 28.Internet Explorer: In Internet Explorer 10 and 11, if column flex items have `align-items: center;` set on them and their content is too large, then they will overflow the bounds of their container. See Flexbug #2.Opera: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Opera implements the new behavior beginning with Opera 39.Opera Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Opera Android implements the new behavior beginning with Opera Android 41.Samsung Internet: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Samsung Internet implements the new behavior beginning with Samsung Internet 6.0.WebView Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. WebView Android implements the new behavior beginning with WebView Android 52.
css.properties.align-self.flex_context 📋	Firefox	4/2/2013	Safari	10/22/2013	203	Chrome: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.Chrome Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome Android implements the new behavior beginning with Chrome Android 52.Firefox: Before Firefox 27, only single-line flexbox is supported.Firefox for Android: Before Firefox for Android 27, only single-line flexbox is supported.Samsung Internet: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Samsung Internet implements the new behavior beginning with Samsung Internet 6.0.WebView Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. WebView Android implements the new behavior beginning with WebView Android 52.
css.properties.background-position.side-relative_values	Firefox	6/5/2012	Safari	10/22/2013	504
css.properties.clip-path.html_elements	Firefox	6/30/2009	Safari	10/22/2013	1575
css.properties.image-rendering.optimizeQuality	Firefox	1/21/2010	Safari	10/22/2013	1370
css.properties.image-rendering.optimizeSpeed	Firefox	1/21/2010	Safari	10/22/2013	1370
css.properties.justify-content.flex_context 📋	Firefox	4/2/2013	Safari	10/22/2013	203	Chrome: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.Chrome Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome Android implements the new behavior beginning with Chrome Android 52.Firefox: Before Firefox 27, Firefox supported only single-line flexbox.Firefox for Android: Before Firefox for Android 27, Firefox for Android supported only single-line flexbox.Samsung Internet: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Samsung Internet implements the new behavior beginning with Samsung Internet 6.0.WebView Android: Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. WebView Android implements the new behavior beginning with WebView Android 52.
css.properties.width.is_animatable	Firefox	10/9/2012	Safari	10/22/2013	378
css.properties.width.stretch 📋	Firefox	6/17/2008	Safari	10/22/2013	1953
css.selectors.after.animation_and_transition_support	Firefox	3/22/2011	Safari	10/22/2013	945
css.selectors.before.animation_and_transition_support	Firefox	3/22/2011	Safari	10/22/2013	945
css.types.calc 📋	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Before Firefox 59 `calc()` is not supported in `rgb()` and other color functions.Firefox: Before Firefox 57 `calc(123)` is not parsed successfully.Firefox: Firefox 57 increased the number of places `calc()` could substitute another value. See bug 1350857.Firefox for Android: Before Firefox for Android 59 `calc()` is not supported in `rgb()` and other color functions.Firefox for Android: Before Firefox for Android 57 `calc(123)` is not parsed successfully.Firefox for Android: Firefox for Android 57 increased the number of places `calc()` could substitute another value. See bug 1350857.
css.types.gradient 📋	Firefox	1/21/2010	Safari	10/22/2013	1370	Firefox: Gradients are limited to `background-image`, `border-image`, and `mask-image`.Firefox for Android: Gradients are limited to `background-image`, `border-image`, and `mask-image`.
css.types.gradient.linear-gradient 📋	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Firefox for Android: Since Firefox for Android 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox for Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Internet Explorer: Internet Explorer 5.5 through 9.0 supported gradients via a proprietary filter: `-ms-filter: progid:DXImageTransform.Microsoft.Gradient()`.Opera: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Safari: Safari 4 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.Safari: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Safari on iOS: Safari on iOS 3.2 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.Safari on iOS: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.WebView on iOS: WebView on iOS 3.2 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.WebView on iOS: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.
css.types.gradient.linear-gradient.to	Firefox	1/31/2012	Safari	10/22/2013	630
css.types.gradient.radial-gradient 📋	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox for Android: Since Firefox for Android 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Internet Explorer: Internet Explorer 5.5 through 9.0 supported gradients via a proprietary filter: `-ms-filter: progid:DXImageTransform.Microsoft.Gradient()`.Safari: Safari 4 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.Safari on iOS: Safari on iOS 3.2 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.WebView on iOS: WebView on iOS 3.2 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.
css.types.gradient.radial-gradient.at	Firefox	1/31/2012	Safari	10/22/2013	630
css.types.gradient.repeating-linear-gradient 📋	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Before Firefox 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Firefox for Android: Before Firefox for Android 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox for Android: Since Firefox for Android 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox for Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Internet Explorer: Internet Explorer 5.5 through 9.0 supported gradients via a proprietary filter: `-ms-filter: progid:DXImageTransform.Microsoft.Gradient()`.Opera: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Opera Android: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Safari: Safari 4 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `repeating-linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.Safari: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.Safari on iOS: Safari on iOS 3.2 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `repeating-linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.Safari on iOS: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.WebView on iOS: WebView on iOS 3.2 was supporting an experimental `-webkit-gradient(linear,…)` function. It is more limited than the later standard version: you cannot specify both a position and an angle like in `repeating-linear-gradient()`. This old outdated syntax is still supported for compatibility purposes.WebView on iOS: Considers `<angle>` to start to the right, instead of the top. I.e. it considered an angle of `0deg` as a direction indicator pointing to the right.
css.types.gradient.repeating-linear-gradient.to	Firefox	1/31/2012	Safari	10/22/2013	630
css.types.gradient.repeating-radial-gradient 📋	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Before Firefox 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox for Android: Before Firefox 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox for Android: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Safari: Safari 4 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.Safari on iOS: Safari on iOS 3.2 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.WebView on iOS: WebView on iOS 3.2 was supporting an experimental `-webkit-gradient(radial,…)` function. This old outdated syntax is still supported for compatibility purposes.
css.types.gradient.repeating-radial-gradient.at	Firefox	10/9/2012	Safari	10/22/2013	378	Firefox: Before Firefox 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox: Since Firefox 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.Firefox for Android: Before Firefox for Android 36, gradients weren't applied on the pre-multiplied color space, leading to shades of grey unexpectedly appearing when used with transparency.Firefox for Android: Since Firefox for Android 42, the prefixed version of gradients can be disabled by setting `layout.css.prefixes.gradients` to `false`.
css.types.length.ch	Firefox	11/9/2004	Safari	10/22/2013	3269	Firefox: From Firefox 1 to Firefox 3, `ch` was the width of the M character.Firefox: From Firefox 1 to Firefox 3, `ch` did not work with `border-width` and `outline-width` CSS properties.
css.types.length.vmax	Firefox	2/19/2013	Safari	10/22/2013	245	Firefox: Starting with version 21, viewport-percentage lengths are invalid in `@page`.Firefox for Android: Starting with version 21, viewport-percentage lengths are invalid in `@page`.
css.types.length.vmin	Firefox	2/19/2013	Safari	10/22/2013	245	Firefox: Starting with version 21, viewport-percentage lengths are invalid in `@page`.Firefox for Android: Starting with version 21, viewport-percentage lengths are invalid in `@page`.
css.types.position.four_value_syntax	Firefox	6/5/2012	Safari	10/22/2013	504

2013/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background.background-clip	Safari	7/20/2011	Firefox	6/25/2013	706
css.properties.background.background-origin	Safari	7/20/2011	Firefox	6/25/2013	706

2013/5

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.user-select.none	Safari	4/29/2005	Firefox	5/14/2013	2937

2013/2

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.page-break-inside 📋	Safari	4/15/2005	Firefox	2/19/2013	2867
css.properties.page-break-inside.auto 📋	Safari	4/15/2005	Firefox	2/19/2013	2867
css.properties.page-break-inside.avoid 📋	Safari	4/15/2005	Firefox	2/19/2013	2867	Firefox: Until Firefox 25, `page-break-inside: avoid` did not work with the height of a block.Firefox for Android: Until Firefox for Android 25, `page-break-inside: avoid` did not work with the height of a block.
css.types.calc.gradient_color_stops	Safari	7/25/2012	Firefox	2/19/2013	209
css.types.global_keywords.initial 📋	Safari	2/2/2004	Firefox	2/19/2013	3305
css.types.length.vh	Safari	7/25/2012	Firefox	2/19/2013	209	Firefox: Starting with version 21, viewport-percentage lengths are invalid in `@page`.Firefox for Android: Starting with version 21, viewport-percentage lengths are invalid in `@page`.
css.types.length.vw	Safari	7/25/2012	Firefox	2/19/2013	209	Firefox: Starting with version 21, viewport-percentage lengths are invalid in `@page`.Firefox for Android: Starting with version 21, viewport-percentage lengths are invalid in `@page`.

2012/10

API	First Browser	Date	Last Browser	Date	Days
css.properties.animation-direction.alternate-reverse 📋	Safari	7/25/2012	Firefox	10/9/2012	76
css.properties.animation-direction.reverse 📋	Safari	7/25/2012	Firefox	10/9/2012	76
css.properties.transform.3d	Safari	6/8/2009	Firefox	10/9/2012	1219
css.properties.transition-property.IDENT_value	Safari	6/8/2009	Firefox	10/9/2012	1219

2012/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.border-image 📋	Safari	7/25/2012	Firefox	8/28/2012	34	Chrome: Before Chrome 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Chrome Android: Before Chrome Android 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Edge: Before Edge 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Firefox: Small SVGs are incorrectly stretched, because percentages in `border-image-slice` are computed to integers instead of floats (bug 1284797).Firefox: Until Firefox 47, SVGs without viewport were not sliced correctly (bug 619500).Firefox: From Firefox 48 until Firefox 49, SVGs without viewport are displayed the same as SVGs with viewport, but if the slices are not exactly 50%, they are incorrectly stretched (bug 1264809).Firefox: Until Firefox 57, an issue persisted for SVGs without viewport when e10s was disabled (bug 1290782).Firefox: Before Firefox 15, an earlier version of the specification was implemented, prefixed.Firefox for Android: Small SVGs are incorrectly stretched, because percentages in `border-image-slice` are computed to integers instead of floats (bug 1284797).Firefox for Android: Until Firefox for Android 47, SVGs without viewport were not sliced correctly (bug 619500).Firefox for Android: From Firefox for Android 48 until Firefox for Android 49, SVGs without viewport are displayed the same as SVGs with viewport, but if the slices are not exactly 50%, they are incorrectly stretched (bug 1264809).Firefox for Android: Until Firefox for Android 57, an issue persisted for SVGs without viewport when e10s was disabled (bug 1290782).Firefox for Android: Before Firefox for Android 15, an earlier version of the specification was implemented, prefixed.Quest Browser: Before Quest Browser false, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Opera: Before Opera 98, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Opera Android: A border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Samsung Internet: Before Samsung Internet 23.0, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).WebView Android: Before WebView 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).
css.properties.border-image.fill	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.border-image.optional_border_image_slice	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.border-image-outset 📋	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.border-image-repeat 📋	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.border-image-slice 📋	Safari	7/25/2012	Firefox	8/28/2012	34	Firefox: Small SVGs are incorrectly stretched, because percentages in `border-image-slice` are computed to integers instead of floats (bug 1284797).Firefox: Until Firefox 47, SVGs without viewport were not sliced correctly (bug 619500).Firefox: From Firefox 48 until Firefox 49, SVGs without viewport are displayed the same as SVGs with viewport, but if the slices are not exactly 50%, they are incorrectly stretched (bug 1264809).Firefox: Until Firefox 57, an issue persisted for SVGs without viewport when e10s was disabled (bug 1290782).Firefox for Android: Small SVGs are incorrectly stretched, because percentages in `border-image-slice` are computed to integers instead of floats (bug 1284797).Firefox for Android: Until Firefox for Android 47, SVGs without viewport were not sliced correctly (bug 619500).Firefox for Android: From Firefox for Android 48 until Firefox for Android 49, SVGs without viewport are displayed the same as SVGs with viewport, but if the slices are not exactly 50%, they are incorrectly stretched (bug 1264809).Firefox for Android: Until Firefox for Android 57, an issue persisted for SVGs without viewport when e10s was disabled (bug 1290782).
css.properties.border-image-source 📋	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.border-image-width.auto 📋	Safari	7/25/2012	Firefox	8/28/2012	34
css.properties.word-break 📋	Safari	10/26/2007	Firefox	8/28/2012	1768	Internet Explorer: No version of Internet Explorer supports the `initial` value.Internet Explorer: Don't use `-ms-word-break`, which is a synonym for `word-break`.
css.properties.word-break.break-all 📋	Safari	10/26/2007	Firefox	8/28/2012	1768
css.properties.word-break.normal 📋	Safari	10/26/2007	Firefox	8/28/2012	1768

2012/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.border-image-width 📋	Firefox	6/5/2012	Safari	7/25/2012	50	Chrome: Before Chrome 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Chrome Android: Before Chrome Android 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Edge: Before Edge 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Quest Browser: Before Quest Browser false, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Opera: Before Opera 98, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Opera Android: Before Opera Android 75, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).Samsung Internet: Before Samsung Internet 23.0, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).WebView Android: Before WebView Android 112, a border image's absolute or percentage length width may not take precedence over a narrower `border-width` (bug 40541033).
css.properties.flood-color 📋	Firefox	6/17/2008	Safari	7/25/2012	1499
css.properties.flood-opacity 📋	Firefox	6/17/2008	Safari	7/25/2012	1499
css.properties.image-rendering 📋	Firefox	1/21/2010	Safari	7/25/2012	916
css.properties.image-rendering.auto 📋	Firefox	1/21/2010	Safari	7/25/2012	916
css.properties.lighting-color 📋	Firefox	6/17/2008	Safari	7/25/2012	1499
css.properties.text-rendering.geometricPrecision	Firefox	11/9/2004	Safari	7/25/2012	2815	Chrome: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Chrome Android: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Edge: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Firefox: Firefox treats `geometricPrecision` the same as `optimizeLegibility`.Firefox for Android: Firefox treats `geometricPrecision` the same as `optimizeLegibility`.Quest Browser: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Opera: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Opera Android: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.Samsung Internet: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.WebView Android: Supports true geometric precision without rounding up or down to the nearest supported font size in the operating system.
css.properties.text-transform.lowercase_sigma	Firefox	7/17/2012	Safari	7/25/2012	8
css.types.easing-function.cubic-bezier 📋	Firefox	3/22/2011	Safari	7/25/2012	491

2012/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background-repeat.2-value	Safari	6/7/2010	Firefox	6/5/2012	729
css.types.angle.turn	Safari	6/8/2009	Firefox	6/5/2012	1093

2012/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.perspective.none 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.perspective-origin.bottom 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.perspective-origin.center 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.perspective-origin.left 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.perspective-origin.right 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.perspective-origin.top 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.properties.transform-origin.three_value_syntax	Safari	6/7/2010	Firefox	1/31/2012	603
css.types.transform-function.matrix3d 📋	Safari	6/8/2009	Firefox	1/31/2012	967	Firefox: Before Firefox 16, the translation values of `matrix3d()` could be `<length>`s, in addition to the standard `<number>`.
css.types.transform-function.perspective 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.rotate3d 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.rotateX 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.rotateY 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.rotateZ 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.scale3d 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.scaleZ 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.translate3d 📋	Safari	6/8/2009	Firefox	1/31/2012	967
css.types.transform-function.translateZ 📋	Safari	6/8/2009	Firefox	1/31/2012	967

2011/12

API	First Browser	Date	Last Browser	Date	Days
css.properties.background.background-size	Safari	7/20/2011	Firefox	12/20/2011	153
css.properties.hyphens.language_italian	Safari	7/20/2011	Firefox	12/20/2011	153
css.properties.hyphens.language_turkish	Safari	7/20/2011	Firefox	12/20/2011	153

2011/11

API	First Browser	Date	Last Browser	Date	Days
css.properties.hyphens.language_catalan	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_danish	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_dutch	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_french	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_german_reformed_orthography	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_norwegian_no	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_russian	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_spanish	Safari	7/20/2011	Firefox	11/8/2011	111
css.properties.hyphens.language_swedish	Safari	7/20/2011	Firefox	11/8/2011	111

2011/9

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.text-overflow 📋	Safari	4/15/2005	Firefox	9/27/2011	2356	Firefox: Until Firefox 10, handling of `text-overflow` on blocks with inline overflow on both horizontal sides was incorrect. Before Firefox 10, if only one value was specified (such as `text-overflow: ellipsis;`), text was ellipsed on both sides of the block, instead of only the end edge based on the block's text direction.Firefox for Android: Until Firefox for Android 10, handling of `text-overflow` on blocks with inline overflow on both horizontal sides was incorrect. Before Firefox for Android 10, if only one value was specified (such as `text-overflow: ellipsis;`), text was ellipsed on both sides of the block, instead of only the end edge based on the block's text direction.
css.properties.text-overflow.clip 📋	Safari	4/15/2005	Firefox	9/27/2011	2356
css.properties.text-overflow.ellipsis 📋	Safari	4/15/2005	Firefox	9/27/2011	2356

2011/8

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.hyphens.auto	Safari	7/20/2011	Firefox	8/16/2011	27	Chrome: Only supported on macOS.Edge: Only supported on macOS.Opera: Only supported on macOS.
css.properties.hyphens.language_english	Safari	7/20/2011	Firefox	8/16/2011	27	Firefox: For English, Firefox uses an en-US dictionaryFirefox for Android: For English, Firefox for Android uses an en-US dictionarySafari: For English, Safari uses different en-GB and en-US dictionaries.Safari on iOS: For English, Safari on iOS uses different en-GB and en-US dictionaries.WebView on iOS: For English, WebView on iOS uses different en-GB and en-US dictionaries.
css.selectors.indeterminate.progress	Safari	7/20/2011	Firefox	8/16/2011	27

2011/7

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.font-face.WOFF 📋	Firefox	6/30/2009	Safari	7/20/2011	750
css.properties.border-radius.percentages	Firefox	3/22/2011	Safari	7/20/2011	120	Firefox: Before Firefox 4, `<percentage>` values are implemented in a non-standard way. Both horizontal and vertical radii were relative to the width of the border box.Opera: Before Opera 11.5, the implementation of `<percentage>` values was buggy.
css.properties.box-shadow 📋	Firefox	3/22/2011	Safari	7/20/2011	120	Chrome: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Chrome Android: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Firefox: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Firefox for Android: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Internet Explorer: To use `box-shadow` in Internet Explorer 9 or later, you must set `border-collapse` to `separate`.Internet Explorer: Since version 5.5, Internet Explorer supports Microsoft's DropShadow and Shadow Filter. You can use this proprietary extension to cast a drop shadow (though the syntax and the effect are different from CSS3)Quest Browser: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Opera: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Opera Android: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Safari: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Safari on iOS: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.Samsung Internet: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.WebView Android: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.WebView on iOS: Shadows affect layout in this browser. For example, if you cast an outer shadow to a box with a `width` of `100%`, then you'll see a scrollbar.
css.types.easing-function.steps 📋	Firefox	3/22/2011	Safari	7/20/2011	120

2011/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.animation-direction.alternate 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.animation-direction.normal 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.animation-fill-mode.backwards 📋	Safari	6/7/2010	Firefox	6/21/2011	379
css.properties.animation-fill-mode.both 📋	Safari	6/7/2010	Firefox	6/21/2011	379
css.properties.animation-fill-mode.forwards 📋	Safari	6/7/2010	Firefox	6/21/2011	379
css.properties.animation-fill-mode.none 📋	Safari	6/7/2010	Firefox	6/21/2011	379
css.properties.animation-iteration-count.infinite 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.animation-name.none 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.animation-play-state.paused 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.animation-play-state.running 📋	Safari	6/8/2009	Firefox	6/21/2011	743
css.properties.resize.block_level_support	Safari	6/8/2009	Firefox	6/21/2011	743	Firefox: `resize` doesn't have any effect on `<iframe>`. See bug 680823)Firefox for Android: `resize` doesn't have any effect on `<iframe>`. See bug 680823)

2011/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background.SVG_image_as_background	Safari	3/18/2008	Firefox	3/22/2011	1099
css.properties.background-clip 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Chrome: Chrome accepts alternate synonyms to its values: `padding`, `border`, and `content`.Chrome Android: Chrome Android accepts alternate synonyms to its values: `padding`, `border`, and `content`.Edge: Since Edge 79, accepts alternate synonyms to its values: `padding`, `border`, and `content`.Firefox: Used the `-moz-background-clip: padding \| border` syntax.Internet Explorer: In IE 7 and IE 8 of Internet Explorer, this property always behaved like `background-clip: padding-box` when `overflow` was `hidden`, `auto`, or `scroll`.Quest Browser: Quest Browser accepts alternate synonyms to its values: `padding`, `border`, and `content`.Opera: Opera accepts alternate synonyms to its values: `padding`, `border`, and `content`.Opera Android: Opera accepts alternate synonyms to its values: `padding`, `border`, and `content`.Safari: Safari accepts alternate synonyms to its values: `padding`, `border`, and `content`.Safari on iOS: Safari accepts alternate synonyms to its values: `padding`, `border`, and `content`.Samsung Internet: Samsung Internet accepts alternate synonyms to its values: `padding`, `border`, and `content`.WebView Android: WebView Android accepts alternate synonyms to its values: `padding`, `border`, and `content`.WebView on iOS: Safari accepts alternate synonyms to its values: `padding`, `border`, and `content`.
css.properties.background-clip.border-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243
css.properties.background-clip.content-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243	Internet Explorer: In IE 7 and IE 9 of Internet Explorer, it always behaved like `background-clip: padding-box` if `overflow: hidden \| auto \| scroll`
css.properties.background-clip.padding-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243
css.properties.background-image.svg_images	Safari	6/7/2010	Firefox	3/22/2011	288	Safari: Support of SVG in CSS background is incomplete.Safari on iOS: Support of SVG in CSS background is incomplete.WebView on iOS: Support of SVG in CSS background is incomplete.
css.properties.background-origin 📋	Safari	10/26/2007	Firefox	3/22/2011	1243	Chrome: Chrome accepts alternate synonyms to its values: `padding`, `border`, and `content`.Chrome Android: Chrome Android accepts alternate synonyms to its values: `padding`, `border`, and `content`.Edge: Since Edge 79, accepts alternate synonyms to its values: `padding`, `border`, and `content`.Firefox: Used the `-moz-background-clip: padding \| border` syntax.Internet Explorer: In IE 7 and before, Internet explorer was behaving as if `background-origin: border-box` was set. In Internet Explorer 8, as if `background-origin: padding-box`, the regular default value, was set.Quest Browser: Quest Browser accepts alternate synonyms to its values: `padding`, `border`, and `content`.Opera: Opera accepts alternate synonyms to its values: `padding`, `border`, and `content`.Opera Android: Opera accepts alternate synonyms to its values: `padding`, `border`, and `content`.Safari: Webkit accepts alternate synonyms to its values: `padding`, `border`, and `content`.Safari on iOS: Webkit accepts alternate synonyms to its values: `padding`, `border`, and `content`.Samsung Internet: Samsung Internet accepts alternate synonyms to its values: `padding`, `border`, and `content`.WebView Android: WebView accepts alternate synonyms to its values: `padding`, `border`, and `content`.WebView on iOS: Webkit accepts alternate synonyms to its values: `padding`, `border`, and `content`.
css.properties.background-origin.border-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243
css.properties.background-origin.content-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243	Internet Explorer: In IE 7 and IE 9 of Internet Explorer, it always behaved like `background-clip: padding` if `overflow: hidden \| auto \| scroll`.
css.properties.background-origin.padding-box 📋	Safari	10/26/2007	Firefox	3/22/2011	1243
css.properties.background-size 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Chrome: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Chrome Android: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Quest Browser: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Opera: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Opera: Opera 9.5's computation of the background positioning area is incorrect for fixed backgrounds. Opera 9.5 also interprets the two-value form as a horizontal scaling factor and, from appearances, a vertical clipping dimension. This has been fixed in Opera 10.Opera Android: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Opera Android: Opera 9.5's computation of the background positioning area is incorrect for fixed backgrounds. Opera 9.5 also interprets the two-value form as a horizontal scaling factor and, from appearances, a vertical clipping dimension. This has been fixed in Opera 10.Safari: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Safari on iOS: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.Samsung Internet: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.WebView Android: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.WebView on iOS: WebKit-based browsers originally implemented an older draft of CSS3 `background-size` in which an omitted second value is treated as duplicating the first value; this draft does not include the `contain` or `cover` keywords.
css.properties.border-bottom-left-radius 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox for Android 50.
css.properties.border-bottom-left-radius.percentages	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 4, the `<percentage>` was relative to the width of the box even when specifying the radius for a height. This implied that `-moz-border-radius-bottomright` was always drawing an arc of circle, and never an ellipse, when followed by a single value.
css.properties.border-bottom-right-radius 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox for Android 50.
css.properties.border-bottom-right-radius.percentages	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 4, the `<percentage>` was relative to the width of the box even when specifying the radius for a height. This implied that `-moz-border-radius-bottomright` was always drawing an arc of circle, and never an ellipse, when followed by a single value.
css.properties.border-radius 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Chrome: Chrome ignores `border-radius` on `<select>` elements unless `-webkit-appearance` is overridden to an appropriate value.Firefox: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-style` was `solid`. This has been fixed in Firefox 50.Firefox: To conform to the CSS3 standard, Firefox 4 changes the handling of `<percentage>` values to match the specification. You can specify an ellipse as a border on an arbitrary sized element with `border-radius: 50%;`. Firefox 4 also makes rounded corners clip content and images if `overflow: visible` is not set.Firefox for Android: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-style` was `solid`. This has been fixed in Firefox 50.Opera: Before Opera 11.60, replaced elements with `border-radius` do not have rounded corners.Safari: Safari ignores `border-radius` on `<select>` elements unless `-webkit-appearance` is overridden to an appropriate value.Safari on iOS: Safari ignores `border-radius` on `<select>` elements unless `-webkit-appearance` is overridden to an appropriate value.WebView on iOS: Safari ignores `border-radius` on `<select>` elements unless `-webkit-appearance` is overridden to an appropriate value.
css.properties.border-radius.4_values_for_4_corners	Safari	6/7/2010	Firefox	3/22/2011	288
css.properties.border-radius.elliptical_borders	Safari	10/26/2007	Firefox	3/22/2011	1243	Chrome: Before Chrome 4, the slash `/` notation is unsupported. If two values are specified, then an elliptical border is drawn on all four corners. `-webkit-border-radius: 40px 10px;` is equivalent to `border-radius: 40px / 10px;`.Safari: Before Safari 5, the slash `/` notation is unsupported. If two values are specified, then an elliptical border is drawn on all four corners. `-webkit-border-radius: 40px 10px;` is equivalent to `border-radius: 40px / 10px;`.
css.properties.border-top-left-radius 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox for Android 50.
css.properties.border-top-left-radius.percentages	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 4, the `<percentage>` was relative to the width of the box even when specifying the radius for a height. This implied that `-moz-border-radius-bottomright` was always drawing an arc of circle, and never an ellipse, when followed by a single value.
css.properties.border-top-right-radius 📋	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox for Android 50.
css.properties.border-top-right-radius.percentages	Safari	6/7/2010	Firefox	3/22/2011	288	Firefox: Before Firefox 4, the `<percentage>` was relative to the width of the box even when specifying the radius for a height. This implied that `-moz-border-radius-bottomright` was always drawing an arc of circle, and never an ellipse, when followed by a single value.
css.properties.resize 📋	Safari	10/26/2007	Firefox	3/22/2011	1243	Safari on iOS: The value is recognized, but has no effect.WebView on iOS: The value is recognized, but has no effect.
css.properties.transition-property.all 📋	Safari	3/18/2008	Firefox	3/22/2011	1099
css.properties.transition-property.none 📋	Safari	3/18/2008	Firefox	3/22/2011	1099
css.selectors.default 📋	Safari	6/7/2010	Firefox	3/22/2011	288
css.selectors.invalid 📋	Safari	6/7/2010	Firefox	3/22/2011	288
css.selectors.optional 📋	Safari	6/7/2010	Firefox	3/22/2011	288
css.selectors.required 📋	Safari	6/7/2010	Firefox	3/22/2011	288
css.selectors.valid 📋	Safari	6/7/2010	Firefox	3/22/2011	288
css.selectors.visited.privacy_measures	Safari	6/7/2010	Firefox	3/22/2011	288
css.types.easing-function 📋	Safari	3/18/2008	Firefox	3/22/2011	1099
css.types.time 📋	Safari	3/18/2008	Firefox	3/22/2011	1099

2010/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media.aspect-ratio 📋	Firefox	6/30/2009	Safari	6/7/2010	342
css.at-rules.media.orientation 📋	Firefox	10/24/2006	Safari	6/7/2010	1322
css.properties.background-size.contain 📋	Firefox	1/21/2010	Safari	6/7/2010	137
css.properties.background-size.cover 📋	Firefox	1/21/2010	Safari	6/7/2010	137
css.properties.box-shadow.inset	Firefox	6/30/2009	Safari	6/7/2010	342	Internet Explorer: `inset` must be the last keyword in the declaration.
css.properties.box-shadow.spread_radius	Firefox	6/30/2009	Safari	6/7/2010	342
css.properties.clip-rule 📋	Firefox	6/30/2009	Safari	6/7/2010	342
css.properties.clip-rule.evenodd 📋	Firefox	6/30/2009	Safari	6/7/2010	342
css.properties.clip-rule.nonzero 📋	Firefox	6/30/2009	Safari	6/7/2010	342
css.properties.cursor.none 📋	Firefox	6/17/2008	Safari	6/7/2010	720	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.list-style-type.cjk-ideographic 📋	Firefox	11/9/2004	Safari	6/7/2010	2036	Opera: Until version 15, only decimal numbers display.Opera Android: Until version 15, only decimal numbers display.
css.properties.list-style-type.ethiopic-halehame-ti-er	Firefox	11/9/2004	Safari	6/7/2010	2036
css.properties.list-style-type.ethiopic-halehame-ti-et	Firefox	11/9/2004	Safari	6/7/2010	2036
css.properties.list-style-type.hangul	Firefox	11/9/2004	Safari	6/7/2010	2036
css.properties.list-style-type.hangul-consonant	Firefox	11/9/2004	Safari	6/7/2010	2036
css.properties.text-rendering 📋	Firefox	11/9/2004	Safari	6/7/2010	2036	Chrome: This property is only supported on Windows and Linux.Chrome: Initial versions had bugs on Windows and Linux that broke font substitution, small-caps, letter-spacing or caused text to overlap. See bug 40156511, bug 40430936, bug 40444347, bug 40286561.Chrome Android: This property is only supported on Windows and Linux.Chrome Android: Initial versions had bugs on Windows and Linux that broke font substitution, small-caps, letter-spacing or caused text to overlap. See bug 40156511, bug 40430936, bug 40444347, bug 40286561.Edge: This property is only supported on Windows and Linux.Edge: Initial versions had bugs on Windows and Linux that broke font substitution, small-caps, letter-spacing or caused text to overlap. See bug 40156511, bug 40430936, bug 40444347, bug 40286561.Firefox: This property is only supported on Windows and Linux.Firefox: The `optimizeSpeed` option has no effect on Firefox 4 because the standard code for text rendering is already fast and there is not a faster code path at this time. See bug 595688 for details.Quest Browser: This property is only supported on Windows and Linux.Quest Browser: Initial versions had bugs on Windows and Linux that broke font substitution, small-caps, letter-spacing or caused text to overlap. See bug 40156511, bug 40430936, bug 40444347, bug 40286561.Samsung Internet: This property is only supported on Windows and Linux. Samsung Internet is not on Windows or Linux.WebView Android: From version 3 to 4.3, there is a serious bug where `text-rendering: optimizeLegibility` causes custom web fonts to not render. This was fixed in version 4.4.
css.properties.text-rendering.auto	Firefox	11/9/2004	Safari	6/7/2010	2036	Chrome: Chrome treats `auto` as `optimizeSpeed`.Chrome Android: Chrome Android treats `auto` as `optimizeSpeed`.Edge: Edge treats `auto` as `optimizeSpeed`.Firefox: If the font size is 20 pixels or higher, Firefox treats `auto` as `optimizeLegibility`. For smaller text, Firefox treats `auto` as `optimizeSpeed`. The 20-pixel threshold can be changed with the `browser.display.auto_quality_min_font_size` preference.Firefox for Android: If the font size is 20 pixels or higher, Firefox treats `auto` as `optimizeLegibility`. For smaller text, Firefox treats `auto` as `optimizeSpeed`. The 20-pixel threshold can be changed with the `browser.display.auto_quality_min_font_size` preference.Quest Browser: Quest Browser treats `auto` as `optimizeSpeed`.Opera: Opera treats `auto` as `optimizeSpeed`.Opera Android: Opera Android treats `auto` as `optimizeSpeed`.Safari: Safari treats `auto` as `optimizeSpeed`. See bug 41363.Safari on iOS: Safari on iOS treats `auto` as `optimizeSpeed`. See bug 41363.Samsung Internet: Samsung Internet treats `auto` as `optimizeSpeed`.WebView Android: WebView Android treats `auto` as `optimizeSpeed`.WebView on iOS: WebView on iOS treats `auto` as `optimizeSpeed`. See bug 41363.
css.types.length.rem	Firefox	1/21/2010	Safari	6/7/2010	137
css.types.ratio 📋	Firefox	6/30/2009	Safari	6/7/2010	342

2010/1

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.background.multiple_backgrounds	Safari	4/15/2005	Firefox	1/21/2010	1742
css.properties.background-attachment.multiple_backgrounds	Safari	4/15/2005	Firefox	1/21/2010	1742
css.properties.background-image.gradients 📋	Safari	6/8/2009	Firefox	1/21/2010	227	Chrome: Some versions support only experimental gradients prefixed with `-webkit`.Chrome Android: Some versions support only experimental gradients prefixed with `-webkit`.Firefox: Some versions support only experimental gradients prefixed with `-moz`.Firefox for Android: Some versions support only experimental gradients prefixed with `-moz`.Quest Browser: Some versions support only experimental gradients prefixed with `-webkit`.Opera: Some versions support only experimental gradients prefixed with `-o`.Opera Android: Some versions support only experimental gradients prefixed with `-webkit`.Safari: Some versions support only experimental gradients prefixed with `-webkit`.Safari on iOS: Some versions support only experimental gradients prefixed with `-webkit`.Samsung Internet: Some versions support only experimental gradients prefixed with `-webkit`.WebView Android: Some versions support only experimental gradients prefixed with `-webkit`.WebView on iOS: Some versions support only experimental gradients prefixed with `-webkit`.
css.properties.background-image.multiple_backgrounds	Safari	4/15/2005	Firefox	1/21/2010	1742
css.properties.background-position.multiple_backgrounds	Safari	4/15/2005	Firefox	1/21/2010	1742
css.properties.background-repeat.multiple_backgrounds	Safari	4/15/2005	Firefox	1/21/2010	1742
css.properties.background-size.auto 📋	Safari	10/26/2007	Firefox	1/21/2010	818
css.properties.pointer-events.html_elements	Safari	6/8/2009	Firefox	1/21/2010	227
css.selectors.indeterminate.checkbox	Safari	10/26/2007	Firefox	1/21/2010	818
css.types.angle 📋	Safari	6/8/2009	Firefox	1/21/2010	227
css.types.angle.deg	Safari	6/8/2009	Firefox	1/21/2010	227
css.types.angle.grad	Safari	6/8/2009	Firefox	1/21/2010	227
css.types.angle.rad	Safari	6/8/2009	Firefox	1/21/2010	227
css.types.angle-percentage 📋	Safari	6/8/2009	Firefox	1/21/2010	227

2009/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.font-face 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.font-face.font-family 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.font-face.font-style 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.font-face.font-variant	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.font-face.font-weight 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.font-face.src 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.properties.border-bottom-left-radius.elliptical_corners	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.border-bottom-right-radius.elliptical_corners	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.border-top-left-radius.elliptical_corners	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.border-top-right-radius.elliptical_corners	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.box-shadow.multiple_shadows	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-wrap.break-word 📋	Safari	6/23/2003	Firefox	6/30/2009	2199
css.properties.overflow-wrap.normal 📋	Safari	6/23/2003	Firefox	6/30/2009	2199
css.properties.overflow-x 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-x.auto 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-x.hidden 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-x.scroll 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-x.visible 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-y 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-y.auto 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-y.hidden 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-y.scroll 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.overflow-y.visible 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.properties.text-shadow 📋	Safari	10/24/2003	Firefox	6/30/2009	2076	Firefox: Firefox versions before 57 have a bug whereby `transition`s will not work when transitioning from a `text-shadow` with a color specified to a `text-shadow` without a color specified (bug 726550).Firefox: From Firefox 4, the blur radius is capped at 300 for performance reasons.Firefox: Firefox theoretically supports infinite text-shadows (don't try it).Firefox: If the `<color>` value is unspecified, then Firefox uses the value of the element's `color` property.Firefox for Android: Firefox for Android versions before 57 have a bug whereby `transition`s will not work when transitioning from a `text-shadow` with a color specified to a `text-shadow` without a color specified (bug 726550).Firefox for Android: From Firefox for Android 4, the blur radius is capped at 300 for performance reasons.Firefox for Android: Firefox for Android theoretically supports infinite text-shadows (don't try it).Firefox for Android: If the `<color>` value is unspecified, then Firefox for Android uses the value of the element's `color` property.Opera: Opera supports a maximum of 6-9 text-shadows for performance reasons. The blur radius is limited to 100px.Opera: Opera 9.5 to 10.1 adheres to the old, reverse painting order (in CSS2, the first specified shadow is on the bottom).Safari: In Safari, any shadows that do not explicitly specify a color are transparent.Safari: Safari 1.1 to 3.2 only supports one text-shadow (displays the first shadow of a comma-separated list and ignores the rest). Safari 4.0 (WebKit 528) and later support multiple text-shadows.Safari on iOS: In Safari, any shadows that do not explicitly specify a color are transparent.Safari on iOS: Safari iOS 1 and 2 only support one text-shadow (displays the first shadow of a comma-separated list and ignores the rest). Safari iOS 3 (WebKit 528) and later support multiple text-shadows.WebView on iOS: In Safari, any shadows that do not explicitly specify a color are transparent.WebView on iOS: Safari iOS 1 and 2 only support one text-shadow (displays the first shadow of a comma-separated list and ignores the rest). Safari iOS 3 (WebKit 528) and later support multiple text-shadows.
css.properties.white-space.pre-line 📋	Safari	10/26/2007	Firefox	6/30/2009	613
css.selectors.first-of-type 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Edge: Before Edge 16, Microsoft Edge treats all unknown elements (such as custom elements) as the same element type.Internet Explorer: Internet Explorer treats all unknown elements (such as custom elements) as the same element type.
css.selectors.last-of-type 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Edge: Before Edge 16, Microsoft Edge treats all unknown elements (such as custom elements) as the same element type.Internet Explorer: Internet Explorer treats all unknown elements (such as custom elements) as the same element type.
css.selectors.nth-child 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Opera: Before Opera 15, Opera does not handle dynamically inserted elements for `:nth-child()`.Opera Android: Before Opera 15, Opera does not handle dynamically inserted elements for `:nth-child()`.
css.selectors.nth-last-child 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.selectors.nth-last-of-type 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Edge: Before Edge 16, Microsoft Edge treats all unknown elements (such as custom elements) as the same element type.Internet Explorer: Internet Explorer treats all unknown elements (such as custom elements) as the same element type.
css.selectors.nth-of-type 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Edge: Before Edge 16, Microsoft Edge treats all unknown elements (such as custom elements) as the same element type.Internet Explorer: Internet Explorer treats all unknown elements (such as custom elements) as the same element type.
css.selectors.only-of-type 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Edge: Before Edge 16, Microsoft Edge treats all unknown elements (such as custom elements) as the same element type.Internet Explorer: Internet Explorer treats all unknown elements (such as custom elements) as the same element type.
css.types.transform-function 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Internet Explorer: Internet Explorer 9 supports 2D but not 3D transforms. In version 9, mixing 2D and 3D transform functions invalidates the entire property.
css.types.transform-function.matrix 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Firefox: Before Firefox 16, the translation values of `matrix()` could be `<length>`s, in addition to the standard `<number>`.
css.types.transform-function.rotate 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.scale 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.scaleX 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.scaleY 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.skew 📋	Safari	3/18/2008	Firefox	6/30/2009	469	Firefox: Firefox 14 removed experimental support for `skew()`, but it was reintroduced in Firefox 15.
css.types.transform-function.skewX 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.skewY 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.translate 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.translateX 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.types.transform-function.translateY 📋	Safari	3/18/2008	Firefox	6/30/2009	469
css.at-rules.charset 📋	Firefox	11/29/2005	Safari	6/8/2009	1287	Firefox: Firefox 1 supported an invalid syntax where the character encoding is not between single or double quotes.Internet Explorer: From Internet Explorer 5.5 to IE 7 (inclusive), Internet Explorer supported an invalid syntax where the character encoding is not between single or double quotes.
css.properties.pointer-events 📋	Firefox	11/29/2005	Safari	6/8/2009	1287
css.properties.text-align.center 📋	Firefox	11/9/2004	Safari	6/8/2009	1672
css.properties.text-align.left 📋	Firefox	11/9/2004	Safari	6/8/2009	1672
css.properties.text-align.right 📋	Firefox	11/9/2004	Safari	6/8/2009	1672
css.selectors.after 📋	Firefox	11/29/2005	Safari	6/8/2009	1287	Firefox: Before Firefox 57, Firefox had a bug where `::after` pseudo-elements were still generated, even if the `content` property value were set to `normal` or `none`.Firefox: Before Firefox 3.5, only the CSS level 2 behavior of `:after` was supported, which disallowed `position`, `float`, `list-style-` and some `display` properties.Firefox for Android: Before Firefox for Android 57, Firefox for Android had a bug where `::after` pseudo-elements were still generated, even if the `content` property value were set to `normal` or `none`.Firefox for Android: Before Firefox for Android 4.5, only the CSS level 2 behavior of `:after` was supported, which disallowed `position`, `float`, `list-style-` and some `display` properties.
css.selectors.before 📋	Firefox	11/29/2005	Safari	6/8/2009	1287	Firefox: Before Firefox 57, Firefox had a bug where `::before` pseudo-elements were still generated, even if the `content` property value were set to `normal` or `none`.Firefox: Before Firefox 3.5, only the CSS level 2 behavior of `:before` was supported, which disallowed `position`, `float`, `list-style-*` and some `display` properties.Firefox for Android: Before Firefox 57, Firefox had a bug where `::before` pseudo-elements were still generated, even if the `content` property value were set to `normal` or `none`.
css.types.color.currentcolor 📋	Firefox	11/29/2005	Safari	6/8/2009	1287

2008/6

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.color-interpolation-filters 📋	Safari	10/26/2007	Firefox	6/17/2008	235
css.properties.color-interpolation-filters.auto 📋	Safari	10/26/2007	Firefox	6/17/2008	235
css.properties.display.inline-table	Safari	6/23/2003	Firefox	6/17/2008	1821
css.properties.min-height 📋	Safari	4/15/2005	Firefox	6/17/2008	1159	Firefox: CSS 2.1 leaves the behavior of `min-height` with `table` undefined. Firefox supports applying `min-height` to `table` elements.Firefox for Android: CSS 2.1 leaves the behavior of `min-height` with `table` undefined. Firefox for Android supports applying `min-height` to `table` elements.Internet Explorer: In Internet Explorer 10 and 11, a `min-height` declaration on a column-direction flex container doesn't apply to the container's flex items. See Flexbug #3 for more info.Opera: CSS 2.1 leaves the behavior of `min-height` with `table` undefined. Opera supports applying `min-height` to `table` elements.
css.properties.white-space.pre-wrap 📋	Safari	10/26/2007	Firefox	6/17/2008	235	Internet Explorer: From Internet Explorer 5.5 to 7, `word-wrap: break-word;` can be used for line breaks in `pre` elements.
css.properties.z-index.negative_values	Safari	6/23/2003	Firefox	6/17/2008	1821
css.selectors.first-child 📋	Safari	3/18/2008	Firefox	6/17/2008	91	Internet Explorer: Internet Explorer 7 doesn't update `:first-child` styles when elements are added dynamically.Internet Explorer: In Internet Explorer 8, if an element is inserted dynamically by clicking on a link, then the `:first-child` style isn't applied until the link loses focus.
css.types.color.named-color.transparent 📋	Safari	3/18/2008	Firefox	6/17/2008	91

2008/3

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.text-align.end 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.properties.text-align.start 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.checked 📋	Firefox	11/9/2004	Safari	3/18/2008	1225	Chrome: On macOS, styling `<option>` elements has no effect.Edge: On macOS, styling `<option>` elements has no effect.Firefox: From Firefox 56, `<option>` elements cannot be styled.Firefox: On macOS, styling `<option>` elements has no effect.Firefox for Android: From Firefox 56, `<option>` elements cannot be styled.Opera: On macOS, styling `<option>` elements has no effect.Safari: Styling `<option>` elements has no effect.Safari on iOS: Styling `<option>` elements has no effect.WebView on iOS: Styling `<option>` elements has no effect.
css.selectors.disabled 📋	Firefox	11/9/2004	Safari	3/18/2008	1225	Edge: Before Edge 79, Edge did not recognize `:disabled` on the `<fieldset>` element.Internet Explorer: Internet Explorer does not recognize `:disabled` on the `<fieldset>` element.
css.selectors.empty 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.enabled 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.lang 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.last-child 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.not 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.selectors.only-child 📋	Firefox	11/29/2005	Safari	3/18/2008	840
css.types.attr 📋	Firefox	11/9/2004	Safari	3/18/2008	1225
css.types.color.hsl 📋	Firefox	11/9/2004	Safari	3/18/2008	1225

2007/10

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.media 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.at-rules.media.color 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.device-aspect-ratio 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.device-height 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.device-width 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.grid 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.height 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.media_features	Firefox	11/9/2004	Safari	10/26/2007	1081
css.at-rules.media.monochrome 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.at-rules.media.width 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.properties.appearance.button 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.checkbox 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.listbox 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.menulist 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.meter 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.progress-bar 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.radio 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.searchfield 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.textarea 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.appearance.textfield 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.box-sizing.border-box 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.box-sizing.content-box 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.column-count.auto 📋	Firefox	11/29/2005	Safari	10/26/2007	696
css.properties.column-gap 📋	Firefox	11/29/2005	Safari	10/26/2007	696
css.properties.column-width.auto	Firefox	11/29/2005	Safari	10/26/2007	696
css.properties.counter-increment 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.counter-increment.none 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.counter-reset 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.counter-reset.none 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.cursor.alias 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.all-scroll 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.cell 📋	Firefox	11/29/2005	Safari	10/26/2007	696
css.properties.cursor.col-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.context-menu 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Chrome: This cursor is only supported on macOS and Linux.Chrome Android: This cursor is only supported on macOS and Linux.Firefox: This cursor is only supported on macOS and Linux.Quest Browser: This cursor is only supported on macOS and Linux.Opera Android: This cursor is only supported on macOS and Linux.Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.Samsung Internet: This cursor is only supported on macOS and Linux.WebView Android: This cursor is only supported on macOS and Linux.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.copy 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.ew-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.nesw-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.no-drop 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.not-allowed 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.ns-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.nwse-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.row-resize 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.url	Firefox	11/29/2005	Safari	10/26/2007	696	Firefox: Firefox 4 added macOS support.
css.properties.cursor.url_positioning_syntax	Firefox	11/29/2005	Safari	10/26/2007	696	Firefox: Firefox 4 added macOS support.Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.vertical-text 📋	Firefox	11/29/2005	Safari	10/26/2007	696	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.overflow.auto 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.overflow.hidden 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.overflow.scroll 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.properties.overflow.visible 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.selectors.attribute 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.selectors.indeterminate 📋	Firefox	10/24/2006	Safari	10/26/2007	367
css.selectors.namespace 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.selectors.subsequent-sibling 📋	Firefox	11/9/2004	Safari	10/26/2007	1081	Internet Explorer: Before Internet Explorer 10, the combinator only works in standards mode.
css.types.counter 📋	Firefox	11/9/2004	Safari	10/26/2007	1081
css.types.counters 📋	Firefox	11/29/2005	Safari	10/26/2007	696

2005/11

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.outline-color 📋	Safari	2/2/2004	Firefox	11/29/2005	666
css.properties.outline-offset 📋	Safari	2/2/2004	Firefox	11/29/2005	666	Firefox: Before Firefox 88, an outline does not follow the shape of `border-radius`.Firefox for Android: Before Firefox for Android 88, an outline does not follow the shape of `border-radius`.
css.properties.outline-style 📋	Safari	2/2/2004	Firefox	11/29/2005	666	Firefox: Before Firefox 88, an outline does not follow the shape of `border-radius`.Firefox for Android: Before Firefox for Android 88, an outline does not follow the shape of `border-radius`.
css.properties.outline-style.auto 📋	Safari	2/2/2004	Firefox	11/29/2005	666
css.properties.outline-width 📋	Safari	2/2/2004	Firefox	11/29/2005	666	Firefox: Before Firefox 88, an outline does not follow the shape of `border-radius`.Firefox for Android: Before Firefox for Android 88, an outline does not follow the shape of `border-radius`.

2005/4

API	First Browser	Date	Last Browser	Date	Days	Notes
css.properties.opacity 📋	Firefox	11/9/2004	Safari	4/29/2005	171
css.properties.user-select.auto	Firefox	11/9/2004	Safari	4/29/2005	171
css.properties.user-select.text	Firefox	11/9/2004	Safari	4/29/2005	171
css.selectors.hover 📋	Firefox	11/9/2004	Safari	4/29/2005	171	Safari on iOS: As of Safari for iOS 7.1.2, tapping a clickable element causes the element to enter the `:hover` state. The element will remain in the `:hover` state until a different element has entered the `:hover` state.WebView on iOS: As of Safari for iOS 7.1.2, tapping a clickable element causes the element to enter the `:hover` state. The element will remain in the `:hover` state until a different element has entered the `:hover` state.
css.selectors.hover.a_elements	Firefox	11/9/2004	Safari	4/29/2005	171
css.selectors.hover.all_elements	Firefox	11/9/2004	Safari	4/29/2005	171	Edge: In Edge, hovering over an element and then scrolling up or down without moving the pointer will leave the element in the `:hover` state until the pointer is moved. See bug 5381673.Internet Explorer: In Internet Explorer 8 to Internet Explorer 11, hovering over an element and then scrolling up or down without moving the pointer will leave the element in the `:hover` state until the pointer is moved. See bug 926665.Internet Explorer: In Internet Explorer 9 (and possibly earlier), if a `<table>` has a parent with a non-`auto` `width`, `overflow-x: auto;`, the `<table>` has enough content to horizontally overflow its parent, and there are `:hover` styles set on elements within the table, then hovering over said elements will cause the `<table>`'s height to increase. See a live demo that triggers the bug. One workaround for the bug is to set `min-height: 0%;` (the `%` unit must be specified, since unitless and `px` don't work) on the `<table>`'s parent element.
css.properties.max-height 📋	Firefox	11/9/2004	Safari	4/15/2005	157	Firefox: CSS 2.1 leaves the behavior of `max-height` with `table` undefined. Firefox supports applying `max-height` to `table` elements.Opera: CSS 2.1 leaves the behavior of `max-height` with `table` undefined. Opera supports applying `max-height` to `table` elements.
css.properties.max-height.none 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.properties.unicode-bidi 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.properties.unicode-bidi.bidi-override 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.properties.unicode-bidi.embed 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.properties.unicode-bidi.normal 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.properties.visibility.collapse 📋	Firefox	11/9/2004	Safari	4/15/2005	157	Chrome: Chrome treats `visibility: collapse` like `hidden`, leaving a white gap.Chrome: Chrome supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Chrome Android: Chrome Android treats `visibility: collapse` like `hidden`, leaving a white gap.Chrome Android: Chrome Android supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Firefox: Firefox doesn't hide borders when hiding `<col>` and `<colgroup>` elements if `border-collapse: collapse` is set.Firefox: Before Firefox 88, `collapse` is not supported on ruby annotations.Firefox for Android: Firefox for Android doesn't hide borders when hiding `<col>` and `<colgroup>` elements if `border-collapse: collapse` is set.Firefox for Android: Before Firefox for Android 88, `collapse` is not supported on ruby annotations.Quest Browser: Quest Browser treats `visibility: collapse` like `hidden`, leaving a white gap.Quest Browser: Quest Browser supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Opera: Opera treats `visibility: collapse` like `hidden`, leaving a white gap.Opera: Opera supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Opera Android: Opera treats `visibility: collapse` like `hidden`, leaving a white gap.Opera Android: Opera supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Safari: Safari treats `visibility: collapse` like `hidden`, leaving a white gap.Safari: Safari supports the collapse value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Safari on iOS: Safari on iOS treats `visibility: collapse` like `hidden`, leaving a white gap.Safari on iOS: Safari on iOS supports the collapse value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.Samsung Internet: Samsung Internet treats `visibility: collapse` like `hidden`, leaving a white gap.Samsung Internet: Samsung Internet supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.WebView Android: WebView Android treats `visibility: collapse` like `hidden`, leaving a white gap.WebView Android: WebView Android supports the `collapse` value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.WebView on iOS: WebView on iOS treats `visibility: collapse` like `hidden`, leaving a white gap.WebView on iOS: WebView on iOS supports the collapse value only on `<tr>`, `<thead>`, `<tbody>`, and `<tfoot>`, but not on `<col>` and `<colgroup>` elements.
css.selectors.target 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.selectors.type.namespaces	Firefox	11/9/2004	Safari	4/15/2005	157
css.selectors.universal.namespaces	Firefox	11/9/2004	Safari	4/15/2005	157
css.types.shape 📋	Firefox	11/9/2004	Safari	4/15/2005	157
css.types.shape.rect	Firefox	11/9/2004	Safari	4/15/2005	157	Internet Explorer: For Internet Explorer versions 5.5 through 7, the `rect()` function uses spaces (instead of commas) to separate parameters. For Internet Explorer 8 and later versions, only the standard comma-separated syntax is supported.

2004/11

API	First Browser	Date	Last Browser	Date	Days	Notes
css.at-rules.import 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.at-rules.namespace 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-attachment 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-attachment.scroll 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: In Internet Explorer 8 and 9, there is a bug where a computed `background-color` of `transparent` causes `click` events to not get fired on overlaid elements.
css.properties.background-image 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: If the `browser.display.use_document_colors` user preference in `about:config` is set to `false`, background images will not be displayed.Firefox for Android: If the `browser.display.use_document_colors` user preference in `about:config` is set to `false`, background images will not be displayed.
css.properties.background-image.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-position 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-repeat 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-repeat.no-repeat 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-repeat.repeat 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-repeat.repeat-x 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.background-repeat.repeat-y 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-bottom-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-bottom-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox for Android 50.
css.properties.border-bottom-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-collapse 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.border-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-left-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-left-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox 50.Firefox for Android: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox 50.
css.properties.border-left-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-right-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-right-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox 50.Firefox for Android: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-bottom-style` was `solid`. This has been fixed in Firefox 50.
css.properties.border-right-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-spacing 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners were always rendered as if `border-style` was solid. This has been fixed in Firefox for Android 50.
css.properties.border-style.dashed 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.dotted 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.double 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.groove 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.hidden 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.inset 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.outset 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.ridge 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-style.solid 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-top 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-top-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-top-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-top-style` was `solid`. This has been fixed in Firefox 50.Firefox for Android: Before Firefox for Android 50, border styles of rounded corners (with `border-radius`) were always rendered as if `border-top-style` was `solid`. This has been fixed in Firefox for Android 50.
css.properties.border-top-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.border-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: In Internet Explorer versions before 7, when both `top` and `bottom` are specified, the element position is overconstrained and the `top` property has precedence; the computed value of `bottom` is set to `-top`, while its specified value is ignored.
css.properties.bottom.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.caption-side 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.clear 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.clear.both 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.clear.left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.clear.right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.clip 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Before Internet Explorer 7, Internet Explorer incorrectly interprets `clip: auto` as `clip: rect(auto, auto, auto, auto)`.Safari: Safari incorrectly interprets `clip: auto` as `clip: rect(auto, auto, auto, auto)`.Safari on iOS: Safari on iOS incorrectly interprets `clip: auto` as `clip: rect(auto, auto, auto, auto)`.WebView on iOS: WebView on iOS incorrectly interprets `clip: auto` as `clip: rect(auto, auto, auto, auto)`.
css.properties.color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.content 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.content.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.content.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.content.url 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.cursor 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Firefox: Starting in Firefox 67, the maximum size allowed for custom cursors is 32x32 pixels due to cursors being misused by certain malicious sites.Internet Explorer: In Internet Explorer 11, when `cursor` is applied to an element and this element is underneath an open `<select>` menu and the user hovers over a `<select>` menu item that's on top of said element, the cursor for said element will be displayed rather than the `<select>`'s normal cursor. See bug 817822.Safari on iOS: This property is only supported on iPads with an external pointing device.Safari on iOS: Unsupported values use the `default` pointer as a fallback.WebView on iOS: This property is only supported on iPads with an external pointing device.WebView on iOS: Unsupported values use the `default` pointer as a fallback.
css.properties.cursor.auto 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.cursor.crosshair 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.default 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.e-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.help 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.move 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.n-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.ne-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.nw-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.pointer 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.progress 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.s-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.se-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.sw-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.text 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.cursor.w-resize 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.cursor.wait 📋	Safari	2/2/2004	Firefox	11/9/2004	281	Safari on iOS: If this value is used, the iPad will display the `default` pointer instead.WebView on iOS: If this value is used, the iPad will display the `default` pointer instead.
css.properties.direction 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.direction.ltr 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.direction.rtl 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.block 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.inline 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.inline-block	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Until Internet Explorer 8, `inline-block` is only for natural inline elements.
css.properties.display.list-item 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Chrome: Chrome 65 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.Chrome Android: Chrome Android 65 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.Quest Browser: Quest Browser 5.0 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.Opera: Opera 52 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.Opera Android: Opera Android 47 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.Samsung Internet: Chrome 65 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.WebView Android: WebView Android 65 stopped creating layout objects for elements inside an `<iframe>` with `display:none` applied.
css.properties.display.table	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-cell	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-column	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-column-group	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-footer-group	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-header-group	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-row	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.display.table-row-group	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.empty-cells 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.float 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.float.left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.float.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.float.right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.caption	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.icon	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.menu	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.message-box	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.small-caption	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font.status-bar	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-family 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Not supported on `option` elements. See bug 1536148.
css.properties.font-size 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 44, `oblique` was not distinguished from `italic`.Firefox for Android: Before Firefox for Android 44, `oblique` was not distinguished from `italic`.
css.properties.font-style.italic 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-style.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-variant 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Only supports the `small-caps` and `normal` keywords.
css.properties.font-variant.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-weight 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-weight.bold 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-weight.bolder 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-weight.lighter 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.font-weight.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.height 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.height.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.left.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.letter-spacing 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.letter-spacing.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.line-height 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.line-height.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-image 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 86, this property did not accept an `<image>` type, and required the URL of an image.Firefox for Android: Before Firefox for Android 86, this property did not accept an `<image>` type, and required the URL of an image.
css.properties.list-style-image.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-position 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Safari: In Safari, if a block element is the first child of a list element declared as `list-style-position: inside`, then the marker box is placed on the same line as the block element.Safari on iOS: In Safari on iOS, if a block element is the first child of a list element declared as `list-style-position: inside`, then the marker box is placed on the same line as the block element.WebView on iOS: In WebView on iOS, if a block element is the first child of a list element declared as `list-style-position: inside`, then the marker box is placed on the same line as the block element.
css.properties.list-style-position.inside 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-position.outside 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.armenian 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.circle 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.decimal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.decimal-leading-zero 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.disc 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.georgian 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.hebrew 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.hiragana 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.hiragana-iroha 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.katakana 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.katakana-iroha 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.lower-alpha 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.lower-greek 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.lower-latin 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.lower-roman 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.square 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.upper-alpha 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.upper-latin 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.list-style-type.upper-roman 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin.auto	Safari	6/23/2003	Firefox	11/9/2004	505	Edge: The `auto` value is not supported in quirks mode.Internet Explorer: The `auto` value is not supported in quirks mode.
css.properties.margin-bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin-bottom.auto	Safari	6/23/2003	Firefox	11/9/2004	505	Edge: The `auto` value is not supported in quirks mode.Internet Explorer: The `auto` value is not supported in quirks mode.
css.properties.margin-left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin-left.auto	Safari	6/23/2003	Firefox	11/9/2004	505	Edge: The `auto` value is not supported in quirks mode.Internet Explorer: The `auto` value is not supported in quirks mode.
css.properties.margin-right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin-right.auto	Safari	6/23/2003	Firefox	11/9/2004	505	Edge: The `auto` value is not supported in quirks mode.Internet Explorer: The `auto` value is not supported in quirks mode.
css.properties.margin-top 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.margin-top.auto	Safari	6/23/2003	Firefox	11/9/2004	505	Edge: The `auto` value is not supported in quirks mode.Internet Explorer: The `auto` value is not supported in quirks mode.
css.properties.max-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: CSS 2.1 leaves the behavior of `max-width` with `table` undefined. Firefox supports applying `max-width` to `table` elements.Firefox for Android: CSS 2.1 leaves the behavior of `max-width` with `table` undefined. Firefox for Android supports applying `max-width` to `table` elements.Opera: CSS 2.1 leaves the behavior of `max-width` with `table` undefined. Opera supports applying `max-width` to `table` elements.
css.properties.max-width.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.min-width 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: CSS 2.1 leaves the behavior of `min-width` with `table` undefined. Firefox supports applying `min-width` to `table` elements.Firefox for Android: CSS 2.1 leaves the behavior of `min-width` with `table` undefined. Firefox for Android supports applying `min-width` to `table` elements.Opera: CSS 2.1 leaves the behavior of `min-width` with `table` undefined. Opera supports applying `min-width` to `table` elements.
css.properties.outline-style.dashed 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.dotted 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.double 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.groove 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.inset 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.none 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.outset 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.ridge 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.outline-style.solid 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.overflow 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: After Firefox 3.6, the `overflow` property is correctly applied to table group elements (`<thead>`, `<tbody>`, `<tfoot>`).Internet Explorer: From version 4 to 6, Internet Explorer enlarges an element with `overflow: visible` (default value) to fit the content inside it. `height` and `width` behave like `min-height` and `min-width`, respectively.
css.properties.padding 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.padding-bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.padding-left 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.padding-right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.padding-top 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.page-break-after 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-after.always 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-after.auto 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-after.left 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-after.right 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-before 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-before.always 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-before.auto 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-before.left 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.page-break-before.right 📋	Safari	2/2/2004	Firefox	11/9/2004	281
css.properties.position 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.position.absolute 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 57, absolute positioning did not work correctly when applied to elements inside tables that have `border-collapse` applied to them (bug 1379306).Firefox: Before Firefox 30, absolute positioning of table rows and row groups was not supported (bug 63895).Firefox for Android: Before Firefox for Android 57, absolute positioning did not work correctly when applied to elements inside tables that have `border-collapse` applied to them (bug 1379306).Firefox for Android: Before Firefox for Android 30, absolute positioning of table rows and row groups was not supported (bug 63895).
css.properties.position.fixed 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 44, `position: fixed` didn't create a stacking context in most cases. Firefox and the specification have been modified to mimic Chrome and Safari's long-time behavior.Firefox for Android: Before Firefox for Android 44, `position: fixed` didn't create a stacking context in most cases. Firefox for Android and the specification have been modified to mimic Chrome and Safari's long-time behavior.Internet Explorer: In Internet Explorer, fixed positioning doesn't work if the document is in quirks mode.
css.properties.position.relative 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.position.static 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.right 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.right.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.table-layout 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-align 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-align.justify 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-decoration 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-indent 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-transform 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Chrome: The `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.Chrome Android: The `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.Quest Browser: The `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.Opera: Since Opera 15, the `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.Safari: The `text-transform` property does not work for `::first-line` pseudo-elements (also not for the old one-colon syntax). See bug 3409.Safari on iOS: The `text-transform` property does not work for `::first-line` pseudo-elements (also not for the old one-colon syntax). See bug 3409.Samsung Internet: The `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.WebView Android: The `text-transform` property does not work for `::first-line` pseudo-elements (nor for the one-colon syntax). See bug 40214861.WebView on iOS: The `text-transform` property does not work for `::first-line` pseudo-elements (also not for the old one-colon syntax). See bug 3409.
css.properties.text-transform.capitalize 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Firefox: Before Firefox 14, some punctuation characters could interfere with correct capitalization. See bug 731536.Firefox for Android: Before Firefox for Android 14, some punctuation characters could interfere with correct capitalization. See bug 731536.
css.properties.text-transform.lowercase 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-transform.none 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-transform.uppercase 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.text-transform.uppercase_eszett	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.top 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: In Internet Explorer versions before 7, when both `top` and `bottom` are specified, the element position is overconstrained and the `top` property has precedence; the computed value of `bottom` is set to `-top`, while its specified value is ignored.
css.properties.top.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.baseline 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.middle 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.sub 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.super 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.text-bottom 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.text-top 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.vertical-align.top 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.visibility 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Internet Explorer doesn't support `visibility: initial`.Internet Explorer: Internet Explorer doesn't support `visibility: unset`.Internet Explorer: Up to Internet Explorer 7, descendants of `hidden` elements will still be invisible even if they have `visibility` set to `visible`.
css.properties.visibility.hidden 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.visibility.visible 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.white-space 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.white-space.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.white-space.nowrap 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.white-space.pre 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.width 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.width.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.word-spacing 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.word-spacing.normal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.z-index 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.properties.z-index.auto 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.active 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.active.non_a_elements	Safari	6/23/2003	Firefox	11/9/2004	505	Safari on iOS: By default, Safari on iOS does not use the `:active` state unless there is a `touchstart` event handler on the relevant element or on the `<body>` element.WebView on iOS: By default, WebView on iOS does not use the `:active` state unless there is a `touchstart` event handler on the relevant element or on the `<body>` element.
css.selectors.child 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Before Internet Explorer 10, the combinator only works in standards mode.
css.selectors.class 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.descendant 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.first-letter 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.first-line 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Chrome: Before Chrome 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Chrome: Before Chrome 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Chrome Android: Before Chrome Android 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Chrome Android: Before Chrome Android 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Quest Browser: Before Quest Browser 5.0, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Quest Browser: Before Quest Browser 5.0, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Opera: From Opera 15 to Opera 49 (exclusive), the `text-transform` property does not work on `::first-line` or `:first-line` pseudo-elements. See bug 40214861.Opera: From Opera 15 to Opera 49 (exclusive), the `text-transform` property does not work on `::first-line` or `:first-line` pseudo-elements. See bug 40214861.Opera Android: From Opera 15 to Opera 49 (exclusive), the `text-transform` property does not work on `::first-line` or `:first-line` pseudo-elements. See bug 40214861.Opera Android: From Opera 15 to Opera 49 (exclusive), the `text-transform` property does not work on `::first-line` or `:first-line` pseudo-elements. See bug 40214861.Safari: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.Safari: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.Safari on iOS: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.Safari on iOS: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.Samsung Internet: Before Samsung Internet 8.0, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.Samsung Internet: Before Samsung Internet 8.0, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.WebView Android: Before WebView 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.WebView Android: Before WebView 62, the `text-transform` property does not work on `::first-line` pseudo-elements. See bug 40214861.WebView on iOS: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.WebView on iOS: The `text-transform` property does not work for `::first-line` or `:first-line` pseudo-elements. See bug 3409.
css.selectors.focus 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.id 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.link 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.list 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.next-sibling 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Before Internet Explorer 10, the combinator only works in standards mode.Internet Explorer: Internet Explorer 7 doesn't update the style correctly when an element is dynamically placed before an element that matched the selector.Internet Explorer: In Internet Explorer 8, if an element is inserted dynamically by clicking on a link the first-child style isn't applied until the link loses focus.
css.selectors.root 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.type 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.universal 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.selectors.visited 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.color.named-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: Internet Explorer 8 and later support gray color keywords spelled with an e (`grey`, `darkgrey`, `darkslategrey`, `dimgrey`, `lightgrey`, and `lightslategrey`). Internet Explorer 3 to Internet Explorer 7 only support the keywords spelled with a (`gray`, `darkgray`, `darkslategray`, `dimgray`, `lightgray`, and `lightslategray`).
css.types.color.rgb 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.color.rgb_hexadecimal_notation 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.color.system-color 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.dimension 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.global_keywords	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.global_keywords.inherit 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.image 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.integer 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.length 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.length.em	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.length.ex	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.length-percentage 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.line-style 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.number 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.overflow 📋	Safari	6/23/2003	Firefox	11/9/2004	505	Internet Explorer: From version 4 to 6, Internet Explorer enlarges an element with `visible` (default value) to fit the content inside it.
css.types.percentage 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.position 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.position.keyword_value_syntax	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.string 📋	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.string.unicode_escaped_characters	Safari	6/23/2003	Firefox	11/9/2004	505
css.types.url 📋	Safari	6/23/2003	Firefox	11/9/2004	505