New single color stop gradients feature

features/single-color-gradients.yml

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+name: Single color stop gradients
+description: A single color stop can be provided to the `linear-gradient()`, `radial-gradient()`, and `conic-gradient()` CSS functions, and their repeating counterparts, to create a solid color background.
+spec: https://drafts.csswg.org/css-images-4/#color-stop-syntax
+group: gradients
+compat_features:
+  - css.types.gradient.conic-gradient.single_color_stop
+  - css.types.gradient.linear-gradient.single_color_stop
+  - css.types.gradient.radial-gradient.single_color_stop

features/single-color-gradients.yml.dist

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+# Generated from: single-color-gradients.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    firefox: "136"
+    firefox_android: "136"
+compat_features:
+  - css.types.gradient.conic-gradient.single_color_stop
+  - css.types.gradient.linear-gradient.single_color_stop
+  - css.types.gradient.radial-gradient.single_color_stop