[Webkit-unassigned] [Bug 243926] New: Closed captions in <video> element breaks long lines to above the previous line instead of under it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243926

            Bug ID: 243926
           Summary: Closed captions in <video> element breaks long lines
                    to above the previous line instead of under it
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhuowei at worthdoingbadly.com

Created attachment 461619

  --> https://bugs.webkit.org/attachment.cgi?id=461619&action=review

Screenshot of two lines of closed caption displayed in the wrong order. The bottom line of caption should be read before the top line.

When playing the video https://www.cartoonnetwork.com/video/unlocked/a-media-episode.html with closed captions enabled, long lines in the closed captions are wrapped into two lines, but the second line is displayed above the first instead of below the first.

Can reproduce in:
- Safari Version 15.6 (17613.3.9.1.5)
- Safari Technology Preview Release 151 (Safari 16.0, WebKit 17615.1.1.2)
both on macOS 12.5 on MacBook Pro (Retina, 13-inch, Early 2015).

Testing in other browsers:
- Chrome (Version 106.0.5231.2 (Official Build) dev (x86_64)) displays the closed captions correctly.
- Safari on iOS 14.1 displays the captions correctly.
- Firefox 103.0.1 (64-bit) breaks lines in the caption correctly (although it incorrectly displays the captions shifted too much to the right).

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