[Webkit-unassigned] [Bug 223125] New: document pictureInPictureElement is null if you Enter Picture in Picture from contextual menu

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223125

            Bug ID: 223125
           Summary: document pictureInPictureElement is null if you Enter
                    Picture in Picture from contextual menu
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Overview: If you enter PiP using the contextual menu item "Enter Picture in Picture", then document.pictureInPictureElement is null. Whereas document.pictureInPictureElement returns the <video> element if you enter PiP using the widget at the top left corner of the video.

Steps to Reproduce:
1) Open https://developer.apple.com/videos/play/wwdc2020/102/
2) Start playing the video
3) Open contextual menu on the video and select "Enter Picture in Picture"
4) Show JavaScript Console
5) document.pictureInPictureElement

Expected Results: <video id="video"...

Actual Results: null

Additional Builds and Platforms:
This also happens in Safari 14.0.3 on macOS 10.14.6. And it happens with the latest Safari Technology Preview 122 on macOS 11.

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