[Webkit-unassigned] [Bug 160962] New: iOS | audio + vtt | caption text aligned on the left with cut text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160962

            Bug ID: 160962
           Summary: iOS | audio + vtt | caption text aligned on the left
                    with cut text
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: francesco.dambrosio at gmail.com

Created attachment 286375
  --> https://bugs.webkit.org/attachment.cgi?id=286375&action=review
iphone 5s screenshot

On Safari/iOS if we play in fullscreen an audio with captions, the player shows cut captions and align text on the left

Steps to Reproduce:
1. add html page with video tag 
2. add video tag with mp3 (or m4a) file source (progressive download) 
3. add track tag with vtt url 
4. open page with Safari on iPhone
5. play audio and turn on captions
6. on iOS player enter in fullscreen mode and show cut captions

demo: http://www.fdambrosio.net/test/player7/ios-captions.html

Expected Results:
entering in fullscreen mode we expect to listen audio and see caption text centered on the screen and aligned at the bottom, or with default position. 

Actual Results:
Player shows caption text cutted and aligned on the left

Version:
iOS 9.3.2 
iPhone and iPad (only in fullscreen mode)

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