document-picture-in-picture
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videoElement.requestPictureInPicture() will reject with NotSupportedError in a pip window.
Update the spec for video element picture-in-picture in document pip window.
- videoElement.requestPictureInPicture() in a document pip window will reject with NotSupportedError.
- document.PictureInPictureEnabled will return false in a pip window. (Not sure if this is needed in spec)