[Webkit-unassigned] [Bug 266688] New: Video disappears or changes its size for a short period of time when a user changes the size of its div container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266688

            Bug ID: 266688
           Summary: Video disappears or changes its size for a short
                    period of time when a user changes the size of its div
                    container
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: banha.ivan at gmail.com

Created attachment 469141

  --> https://bugs.webkit.org/attachment.cgi?id=469141&action=review

Demo video of the issue

Hi. I experienced video disappearing or changing its size for a short period of time when a user changes the size of its div container.

I can steadily reproduce it on macOS Sonoma 14.* and iOS 17.*

I've prepared a repository so you can try to reproduce it. Also, attaching a demo video.  

See demo video: https://github.com/ivan-banha/safari-video-container-resize/blob/main/assets%2Fsafari-video-container-resize.mp4
Demo link: https://ivan-banha.github.io/safari-video-container-resize/
Demo code: https://github.com/ivan-banha/safari-video-container-resize/tree/main


STR:

1. Open the demo link from Safari 17.
2. Press the "Share Screen" button and select a desktop or window to share.
3. Press the "Resize video container" button to make the video container small or big.

NOTES:

1. The red container represents the div, which contains a video element.
2. The container with blue border is an actual video element.

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