Add MediaError to <video> (#2896)

This is the type of HTMLMediaElement's error property, and an orignal
(or almost) part of the API. The message property was a later
improvement, but still very Baseline by now.

Author: foolip

features/video.yml

@@ -66,6 +66,9 @@ compat_features:
   - api.HTMLVideoElement.videoHeight
   - api.HTMLVideoElement.videoWidth
   - api.HTMLVideoElement.width
+  - api.MediaError
+  - api.MediaError.code
+  - api.MediaError.message
   - html.elements.video
   - html.elements.video.autoplay
   - html.elements.video.controls

features/video.yml.dist

@@ -97,6 +97,20 @@ compat_features:
   - api.HTMLVideoElement.poster
   - html.elements.video.poster
 
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "3"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "4"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "2"
+  - api.MediaError
+  - api.MediaError.code
+
   # baseline: high
   # baseline_low_date: 2015-07-29
   # baseline_high_date: 2018-01-29
@@ -322,6 +336,19 @@ compat_features:
   #   safari_ios: "10"
   - html.elements.video.crossorigin
 
+  # baseline: high
+  # baseline_low_date: 2021-09-20
+  # baseline_high_date: 2024-03-20
+  # support:
+  #   chrome: "59"
+  #   chrome_android: "59"
+  #   edge: "79"
+  #   firefox: "52"
+  #   firefox_android: "52"
+  #   safari: "15"
+  #   safari_ios: "15"
+  - api.MediaError.message
+
   # baseline: false
   # support:
   #   chrome: "3"