Merge prefers-color-scheme / color-scheme / light-dark()

For web-platform-dx#1551.

features/color-scheme.yml

@@ -1,5 +1,5 @@
 name: color-scheme
-description: The `color-scheme` CSS property sets which color schemes (light or dark) an element uses and may prevent automatic dark mode adjustments by the browser.
+description: The `color-scheme` CSS property sets which color schemes (light or dark) an element uses and may prevent automatic dark mode adjustments by the browser. The `prefers-color-scheme` media query detects the requested color scheme, and the `light-dark()` function accepts two colors and uses one depending on the current color scheme.
 spec: https://drafts.csswg.org/css-color-adjust-1/#color-scheme-prop
 # `color-scheme: only light` and `color-scheme: only dark` can be used to opt
 # out from Chrome's Auto Dark Theme:
@@ -8,3 +8,15 @@ spec: https://drafts.csswg.org/css-color-adjust-1/#color-scheme-prop
 # Including them increases the Baseline low date from 2022-01-11 (Firefox 98) to
 # 2022-02-03 (Chrome 98). Since this is less than a month's difference and the
 # opt-out could be important for some developers, the later date is accepted.
+status:
+  compute_from:
+    - css.properties.color-scheme
+    - css.properties.color-scheme.only_dark
+    - css.properties.color-scheme.only_light
+compat_features:
+  - css.at-rules.media.prefers-color-scheme
+  - css.properties.color-scheme
+  - css.properties.color-scheme.only_dark
+  - css.properties.color-scheme.only_light
+  - css.types.color.light-dark
+  - html.elements.meta.name.color-scheme

features/color-scheme.yml.dist

@@ -14,6 +14,19 @@ status:
     safari: "13"
     safari_ios: "13"
 compat_features:
+  # baseline: high
+  # baseline_low_date: 2020-01-15
+  # baseline_high_date: 2022-07-15
+  # support:
+  #   chrome: "76"
+  #   chrome_android: "76"
+  #   edge: "79"
+  #   firefox: "67"
+  #   firefox_android: "67"
+  #   safari: "12.1"
+  #   safari_ios: "13"
+  - css.at-rules.media.prefers-color-scheme
+
   # baseline: high
   # baseline_low_date: 2022-01-11
   # baseline_high_date: 2024-07-11
@@ -54,3 +67,15 @@ compat_features:
   #   safari_ios: "13"
   - css.properties.color-scheme.only_dark
   - css.properties.color-scheme.only_light
+
+  # baseline: low
+  # baseline_low_date: 2024-05-13
+  # support:
+  #   chrome: "123"
+  #   chrome_android: "123"
+  #   edge: "123"
+  #   firefox: "120"
+  #   firefox_android: "120"
+  #   safari: "17.5"
+  #   safari_ios: "17.5"
+  - css.types.color.light-dark