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Explainer None Specification https://www.w3.org/TR/css-color-5/#resolving-rcs Design docs https://docs.google.com/document/d/1568wVjrIRbrU9_O37gPu10cj0CDWRiAc6ZMk9t0JpXs/edit Summary Allow relative colors in CSS (using the 'from' keyword) to use 'currentcolor' as a base. This will make it easy for web developers to set complementary colors, based on an element's text color, for that element's borders, shadows, backgrounds, etc. Blink component Blink>CSS<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS> Motivation Relative Color Syntax was selected for Interop 2024 with a large fraction of non-passing tests covering use of currentcolor. Without this feature, web developers have to resort to sub-optimal workarounds such as passing the base color in a CSS Variable. Initial public proposal None TAG review https://github.com/w3ctag/design-reviews/issues/894 TAG review status Satisfied. The link above is for Relative Color Syntax in general. Tests for currentcolor cases were added as part of the discussion before the TAG signed off on the review; I interpret that to mean that they're satisfied with this use case. Risks Interoperability and Compatibility Interoperability: Relative Color Syntax is a focus area for Interop 2024, and inclusion of currentcolor is well covered by existing WPTs, so the risk of other engines not converging on an interoperable implementation is low. Compatibility: The only risk here is that enabling currentcolor support will "light up" color declarations that are being rejected at present. Total usage of Relative Color Syntax on the Web (including currentcolor or otherwise) is ~0.09% of page loads as of May 1, 2024[1]. I haven't done an analysis of currentcolor in RCS, but given that no major engine supported it as of that date, I would expect it to be a tiny fraction of those. [1] https://chromestatus.com/metrics/feature/timeline/popularity/4632 Gecko: Positive (https://github.com/mozilla/standards-positions/issues/841) Implementation bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1893966 WebKit: Shipped/Shipping (https://bugs.webkit.org/show_bug.cgi?id=245970) Changes landed May 13. Web developers: Positive (https://github.com/web-platform-tests/interop/issues/426) This feature is part of Interop 2024. Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Debuggability Covered by existing DevTools support for debugging CSS properties. Is this feature fully tested by web-platform-tests<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>? Yes https://wpt.fyi/results/css/css-color?label=master&label=experimental&aligned&view=interop&q=label%3Ainterop-2024-relative-color Flag name on chrome://flags None Finch feature name CSSRelativeColorSupportsCurrentcolor Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/325309578 Estimated milestones Shipping on desktop 129 Shipping on Android 129 Shipping on WebView 129 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/4755025804132352?gate=6265564461531136 This intent message was generated by Chrome Platform Status<https://chromestatus.com/>. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/PH0PR00MB11527917FE827C65D0277F0EC0A52%40PH0PR00MB1152.namprd00.prod.outlook.com.
