A PiP window doesn’t actually dismiss after the browser navigates to a different page within the same domain
<rdar://problem/62566295>
Created attachment 398112 [details] Patch
Created attachment 398166 [details] Add an API test
Committed r261001: <https://trac.webkit.org/changeset/261001> All reviewed patches have been landed. Closing bug and clearing flags on attachment 398166 [details].