[Webkit-unassigned] [Bug 175031] New: Old subtitle track is not deleted on 'src' attribute change event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175031

            Bug ID: 175031
           Summary: Old subtitle track is not deleted on 'src' attribute
                    change event
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kirill.ovchinn at gmail.com

Test page: https://rednoize.su/vtt-bug/index2.html

1. Start video playing and enable subtitles
2. Ensure that subtitle track is displayed (after 0:00:05 time position)
3. Click on "Next subtitle track" - track URL will be changed
4. You will see the old subtitle track and the new subtitle track in the same time.
5. Click on "Next subtitle track" one more time - the first track URL will be set again.
6. You will see one more clone of the first subtitle track

I cannot find anything in the standards about it. As I can see, it is not prohibited to change 'src' attribute of the <track> element, and I logically suppose that on 'src' change event the old subtitle track should be deleted from the media and hidden from the screen.

Tested on Midori 0.5.11.
Chromium has the same problem, Firefox handles it well.

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