Add image()

features/image-function.yml

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+name: image()
+description: The `image()` CSS function creates an image similar to `url()` but with additional functionality. It can create a solid color as an image, provide a fallback from an image URL to a solid color, or clip a sprite image using media fragments. Not to be confused with the `Image()` constructor.
+spec: https://drafts.csswg.org/css-images-4/#image-notation
+group: images
+compat_features:
+  - css.types.image.image

features/image-function.yml.dist

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+# Generated from: image-function.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}
+compat_features:
+  - css.types.image.image