[Webkit-unassigned] [Bug 251207] New: Regression: video element is not expanded to fullscreen in certain case that by DOM Fullscreen API

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251207

            Bug ID: 251207
           Summary: Regression: video element is not expanded to
                    fullscreen in certain case that by DOM Fullscreen API
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tetsuharu.ohzeki at gmail.com

Created attachment 464667

  --> https://bugs.webkit.org/attachment.cgi?id=464667&action=review

screenshot

## Environment

- macOS 13.2 (Intel)
- Safari TP Release 161 (Safari 16.4, WebKit 18615.1.17.6)


## Steps to reproduce

1. Open https://nocebo.jp/html5_video_fullscreen/
2. Scroll to the embed Codepen iframe.
3. Click Big Buck Bunny's thumbnail.


## Actual Result

Safari does not expand "Big Buck Bunny" video to fullscreen.
Please see the screenshot I attached to this.

## Expected Result

- The video should be expanded to fullscreen.
- Safari 16.3 (18614.4.6.1.5) on macOS 13.2 (Intel) expands it to fullscreen

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