canPlayType() returns "probably" for WebM VP8 Playback after installing the WebM Media Foundation components for IE

Fixed Issue #10534674


Braxton F.
Jan 14, 2017
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Reported by 1 person

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Steps to reproduce

Steps to reproduce:

  1. Install the WebM Media Foundation components for IE (Download at

  2. Check the results of the WebM VP8 test at

What you’ll see is that the test returns “Probably” even though Microsoft Edge is still unable to play the webm even with the components installed for IE.
This bug also causes YouTube to determine that Microsoft Edge is capable of VP8 playback on its HTML5 Player page (


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Ibrahim O.”

      Changed Assigned To to “Brad E.”

      Changed Status to “Fixed”

    • Hello,

      Thank you for providing this information about the issue. We are pleased to report this is fixed in Edge 15145 and will be available in a new release.

      Best Wishes,
      The MS Edge Team

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