The attribute and property synchronization of HTMLVideoElementPictureInPicture is required to pass LayoutTests/imported/w3c/web-platform-tests/picture-in-picture/disable-picture-in-picture.html.
<rdar://problem/56685820>
Created attachment 382158 [details] Patch
Comment on attachment 382158 [details] Patch Clearing flags on attachment: 382158 Committed r251697: <https://trac.webkit.org/changeset/251697>
All reviewed patches have been landed. Closing bug.