[mistersquid]

> Was also disappointed to find that browser picture in picture support was limited to a video element. Wish I could just use it on any element, like with fullscreen.

I have not yet experimented, but perhaps a video element can be styled or injected with HTML/CSS to present non-video content.

[difosfor]

You can hook up a canvas element to be a source for a video element. But that's not very useful to me.