[Webkit-unassigned] [Bug 240871] New: accelerated animations prevent videos from taking up entire screen in fullscreen mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240871

            Bug ID: 240871
           Summary: accelerated animations prevent videos from taking up
                    entire screen in fullscreen mode
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ldebeasi at gmail.com
                CC: dino at apple.com, graouts at apple.com

Created attachment 459722

  --> https://bugs.webkit.org/attachment.cgi?id=459722&action=review

Code reproduction

Running an accelerated animation on an element prevents the containing <video> element from taking up the entire screen when in fullscreen mode.

Steps to reproduce:

1. Open attached code reproduction in Safari for macOS.
2. Click the fullscreen button on the video. Observe that the video goes fullscreen and takes up the entire screen.
3. Exit fullscreen.
4. Click "Add Animation"
5. Click the fullscreen button on the video. Observe that the video goes fullscreen but does not take up the entire screen.

Expected Behavior:

I expect that the video takes up the entire screen when in fullscreen mode.

Actual Behavior:

The video does not take up the entire screen when in fullscreen mode.

Other Information:

- I reproduced this on both Safari 15.5 and STP 145.
- This issue does not reproduce on Chrome or Firefox.

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