[Webkit-unassigned] [Bug 221471] New: CSS transform @keyframes animation breaks full screen video

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221471

            Bug ID: 221471
           Summary: CSS transform @keyframes animation breaks full screen
                    video
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mail at andrewhawkes.co.uk
                CC: dino at apple.com, graouts at apple.com

When a basic CSS @keyframes animation using transforms is applied to the parent element of <video> or <iframe>, the fullscreen behaviour is broken in Safri on macOS.
I've tested this on 14.0.2.

I have set up an example here https://codepen.io/andrewhawkes/pen/ExNPrjj

The example uses an iframe but the same is true for a video element.

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