Split out alpha and colorspace properties from input type=color

These are recent additions to the spec that don't affect the utility
of the original input type=color and don't have the same level of
cross-browser support.

It's unclear if `alpha` and `colorspace` should be a single feature;
browsers could implement one without the other. However they were
added in the same HTML PR, so this seems like a reasonable guess for
now.

Author: jgraham

features/input-color-alpha.yml

@@ -0,0 +1,11 @@
+name: opacity and colorspace in '<input type="color">'
+description: The ability to control the opacity of a color picked using `<input type="color">` and determine the colorspace of the selected color.
+spec: https://html.spec.whatwg.org/multipage/input.html#attr-input-alpha
+group:
+  - forms
+  - html-elements
+compat_features:
+  - api.HTMLInputElement.alpha
+  - api.HTMLInputElement.colorSpace
+  - html.elements.input.alpha
+  - html.elements.input.colorspace

features/input-color-alpha.yml.dist

@@ -0,0 +1,13 @@
+# Generated from: input-color-alpha.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    safari: "18.4"
+    safari_ios: "18.4"
+compat_features:
+  - api.HTMLInputElement.alpha
+  - api.HTMLInputElement.colorSpace
+  - html.elements.input.alpha
+  - html.elements.input.colorspace

features/input-color.yml

@@ -5,12 +5,5 @@ group:
   - forms
   - html-elements
 caniuse: input-color
-status:
-  compute_from:
-    - html.elements.input.type_color
 compat_features:
-  - api.HTMLInputElement.alpha
-  - api.HTMLInputElement.colorSpace
-  - html.elements.input.alpha
-  - html.elements.input.colorspace
   - html.elements.input.type_color

features/input-color.yml.dist

@@ -11,22 +11,4 @@ status:
     safari: "12.1"
     safari_ios: "12.2"
 compat_features:
-  # ⬇️ Same status as overall feature ⬇️
-  # baseline: false
-  # support:
-  #   chrome: "20"
-  #   chrome_android: "25"
-  #   edge: "14"
-  #   firefox: "29"
-  #   safari: "12.1"
-  #   safari_ios: "12.2"
   - html.elements.input.type_color
-
-  # baseline: false
-  # support:
-  #   safari: "18.4"
-  #   safari_ios: "18.4"
-  - api.HTMLInputElement.alpha
-  - api.HTMLInputElement.colorSpace
-  - html.elements.input.alpha
-  - html.elements.input.colorspace