Add Oklab and Oklch (#674)

feature-group-definitions/oklab.yml

@@ -0,0 +1,25 @@
+name: Oklab and Oklch
+description: "The Oklab color space expresses colors in terms of perceived lightness and how red/green and blue/yellow a color is, aiming to match how humans perceive colors. Oklch is a variant of Oklab with polar coordinates. These color spaces can be used with the CSS `color()`, `oklab()`, and `oklch()` functions."
+spec: https://drafts.csswg.org/css-color-4/#ok-lab
+status:
+  baseline: low
+  baseline_low_date: 2023-05-09
+  # Editorial override has been applied to ignore mixed_type_parameters.
+  # TODO: The behavior of lightness gradients requiring gamut mapping is a
+  # topic of debate, and at least these browser bugs:
+  # https://crbug.com/329106317
+  # https://webkit.org/b/255939
+  # These problems should be captured in notes when we support notes.
+  support:
+    chrome: "111"
+    chrome_android: "111"
+    edge: "111"
+    firefox: "113"
+    firefox_android: "113"
+    safari: "15.4"
+    safari_ios: "15.4"
+compat_features:
+  - css.types.color.oklab
+  - css.types.color.oklab.mixed_type_parameters
+  - css.types.color.oklch
+  - css.types.color.oklch.mixed_type_parameters