Contact emailsfuth...@chromium.org
Specificationhttps://drafts.csswg.org/css-color-adjust/#color-scheme-prop
Summary
The 'only' keyword has been re-added to the specification for color-scheme
as a way of per-element opt-out of color-scheme override like forced
darkening.
Previously, both declarations below would force the div element into
color-scheme dark and apply forced darkening. With this change, the second
declaration would opt-out of forced darkening and keep the used
color-scheme 'light'.
div { color-scheme: light } div { color-scheme: only light } will keep the
color-scheme for the element light and opt-out of forced darkening.
This feature is already enabled as part of an original trial in M96:
https://chromestatus.com/features/5672533924773888
Blink componentBlink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
TAG reviewN/A Change to existing API already covered by CSS spec
TAG review statusNot applicable
Risks
Interoperability and Compatibility
Low risk: WebView has shipped forced darkening. This change means content
loaded in WebViews may opt out of forced darkening with "color-scheme: only
light;" where it previously would see 'only' as an unrecognized
color-scheme and for 'light' into 'dark'. Low risk: Making 'only' a
recognized keyword instead of a color-scheme means the parser will no
longer accept multiple instances of 'only' in the same declaration, so
declarations like this will be dropped: div { color-scheme: only only dark
} WebKit already recognized 'only' as an opt-out of forced darkening
keyword.
Gecko: In development (https://bugzilla.mozilla.org/show_bug.cgi?id=1576289)
Development of the color-scheme property in progress. At least blocker
issues are being fixed.
WebKit: Shipped/Shipping
Web developers: No signals
Debuggability
The existing property and the new keyword should automatically be supported
in devtools. There is possibly a need for force dark / color-scheme
override debugging support in devtools, but that is out of scope for this
minor change.
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
?Yes
Changes made to tests under
https://wpt.fyi/results/css/css-color-adjust/parsing to account for spec
changes for 'only'.
Web platform tests do not support running with color-scheme overrides. A
couple of Blink-specific rendering tests have been added to run under
virtual/dark-mode-*
Flag nameCSSColorSchemeOnly (Blink runtime flag)
Requires code in //chrome?False
Tracking bughttps://crbug.com/1224806
Estimated milestones
DevTrial on desktop 96
DevTrial on android 96
DevTrial on Webview 96
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5157621012103168
This intent message was generated by Chrome Platform Status
<https://www.chromestatus.com/>.
--
Rune Lillesveen
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