[Webkit-unassigned] [Bug 174158] New: REGRESSION: Captions and subtitles not showing up in picture-in-picture for MSE content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174158

            Bug ID: 174158
           Summary: REGRESSION: Captions and subtitles not showing up in
                    picture-in-picture for MSE content
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: adam_marcus at me.com

Created attachment 314605

  --> https://bugs.webkit.org/attachment.cgi?id=314605&action=review

Example code demonstrated bug

Captions and subtitles not showing up in picture-in-picture for MSE content

This was fixed in Safari Technology Preview Release 31 (https://bugs.webkit.org/show_bug.cgi?id=172145) and no longer works as of Release 34

Steps to Reproduce:
1. Open Safari
2. Disable Cross-Origin Restrictions (Safari -> Develop -> Disable Cross-Origin Restrictions)
3. Open bug.html (attached)
4. After the video starts playing, enter Picture in Picture mode

Expected Results:
Text tracks should be visible in Picture in Picture mode

Observed Results:
Text tracks are not visible in Picture in Picture mode

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