update desc, add compute_from rationale

features/draft/spec/html.yml

@@ -252,12 +252,6 @@ compat_features:
   - api.History.replaceState
   - api.History.scrollRestoration
   - api.History.state
-  - api.ImageData
-  - api.ImageData.ImageData
-  - api.ImageData.colorSpace
-  - api.ImageData.data
-  - api.ImageData.height
-  - api.ImageData.width
   - api.Location
   - api.Location.ancestorOrigins
   - api.Location.assign

features/draft/spec/html.yml.dist

@@ -367,22 +367,6 @@ compat_features:
   #   safari_ios: ≤3.2
   - html.global_attributes.contenteditable
 
-  # baseline: high
-  # baseline_low_date: 2015-07-29
-  # baseline_high_date: 2018-01-29
-  # support:
-  #   chrome: "1"
-  #   chrome_android: "18"
-  #   edge: "12"
-  #   firefox: "3.5"
-  #   firefox_android: "4"
-  #   safari: "3.1"
-  #   safari_ios: "2"
-  - api.ImageData
-  - api.ImageData.data
-  - api.ImageData.height
-  - api.ImageData.width
-
   # baseline: high
   # baseline_low_date: 2015-07-29
   # baseline_high_date: 2018-01-29
@@ -1785,19 +1769,6 @@ compat_features:
   #   safari_ios: "7"
   - api.TrackEvent.TrackEvent
 
-  # baseline: high
-  # baseline_low_date: 2016-08-02
-  # baseline_high_date: 2019-02-02
-  # support:
-  #   chrome: "36"
-  #   chrome_android: "36"
-  #   edge: "14"
-  #   firefox: "29"
-  #   firefox_android: "29"
-  #   safari: "8"
-  #   safari_ios: "8"
-  - api.ImageData.ImageData
-
   # baseline: high
   # baseline_low_date: 2016-08-02
   # baseline_high_date: 2019-02-02
@@ -3478,15 +3449,6 @@ compat_features:
   - api.HTMLVideoElement.playsInline
   - html.elements.video.playsinline
 
-  # baseline: false
-  # support:
-  #   chrome: "92"
-  #   chrome_android: "92"
-  #   edge: "92"
-  #   safari: "15.2"
-  #   safari_ios: "15.2"
-  - api.ImageData.colorSpace
-
   # baseline: false
   # support:
   #   chrome: "99"

features/imagedata.yml

@@ -0,0 +1,15 @@
+name: ImageData
+description: "`ImageData` represents pixel data for a particular area inside a `Canvas` element, in order to  manipulate that part of the canvas or draw images to it."
+spec: https://html.spec.whatwg.org/multipage/canvas.html#pixel-manipulation
+group: canvas
+# `.colorspace` is not yet implemented in Firefox but the core feature is
+# baseline high for a long time.
+status:
+  compute_from: api.ImageData
+compat_features:
+  - api.ImageData
+  - api.ImageData.ImageData
+  - api.ImageData.colorSpace
+  - api.ImageData.data
+  - api.ImageData.height
+  - api.ImageData.width

features/imagedata.yml.dist

@@ -0,0 +1,54 @@
+# Generated from: imagedata.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "3.5"
+    firefox_android: "4"
+    safari: "3.1"
+    safari_ios: "2"
+compat_features:
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "3.5"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.ImageData
+  - api.ImageData.data
+  - api.ImageData.height
+  - api.ImageData.width
+
+  # baseline: high
+  # baseline_low_date: 2016-08-02
+  # baseline_high_date: 2019-02-02
+  # support:
+  #   chrome: "36"
+  #   chrome_android: "36"
+  #   edge: "14"
+  #   firefox: "29"
+  #   firefox_android: "29"
+  #   safari: "8"
+  #   safari_ios: "8"
+  - api.ImageData.ImageData
+
+  # baseline: false
+  # support:
+  #   chrome: "92"
+  #   chrome_android: "92"
+  #   edge: "92"
+  #   safari: "15.2"
+  #   safari_ios: "15.2"
+  - api.ImageData.colorSpace