[Webkit-unassigned] [Bug 77862] New: Track text rendered multiple times

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77862

           Summary: Track text rendered multiple times
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dutton at google.com


Created an attachment (id=125602)
 --> (https://bugs.webkit.org/attachment.cgi?id=125602&action=review)
Screenshot of track element example with subtitles rendered three times

What steps will reproduce the problem?

Open a page with a video with track element subtitles.


What is the expected result?

Subtitles rendered over video, once per track that has mode 2.


What happens instead?

Subtitles rendered multiple times. 

I've noticed this on several different sites, including the IE track examples. I've also seen a mode 1 metadata track rendered (on http://www.samdutton.com/track).

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