Commits on Sep 20, 2022

1. Restrict handle getter visibility to dedicated worker …

   Removes the MediaSource handle attribute visibility from the main Window
   context, leaving it visible only in dedicated worker contexts. Also
   removes the conditional throwing of NotSupportedError exceptions on
   getting this attribute's value if the implementation doesn't support
   that.
   
   Overall, this change is to undo the backwards incompatibility issue
   found when older versions of MSE web app libraries enumerated main
   thread MediaSource attribute values, hitting exception in the Chromium
   feature implementation through milestone 107. This change replaces that
   with simpler and safer visibility restriction of this getter to just the
   context where it must be supported if the implementation supports
   MSE-in-Workers.
   
   Note, this change replaces the alternative fix discussed in
   w3c/media-source PR w3c#316.

   

   wolenetz committed Sep 20, 2022
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