This is the Picture-in-Picture API it implements: https://w3c.github.io/picture-in-picture/ I am surprised that the API is modelled to only allow watching videos in PiP, while the old and mature Fullscreen API allows to put any element in full screen. These should be analogous. I don't see a reason why I can run a in a small window, but not a a , etc.
Re: Building Firefox's Picture-in-Picture Support
#131Not "API", and Mozilla intends to vote against, I hope...