How do we show the fullscreen video? The Picture-in-Picture window is marked as always on top at an OS level but is the fullscreen content marked as something that will always be on top of it still?

I'm afraid I don't know if this was a deliberate choice or why it happens. Perhaps the same OS-level mechanism is used for both and the last one ends up winning?

FYI I've tried opening fullscreen first and pip WIndow second (on a second attached screen) but it doesn't change anything: Fullscreen is always on top of PiP.

Note that PiP and Fullscreen work well together with Safari browser. See image attached.

Deleted: Screen Shot 2018-10-17 at 10.29.46 AM.png 3.4 MB

	Screen Shot 2018-10-17 at 10.29.46 AM.png 3.4 MB View Download

Not sure about Mac, but on ChromeOS it seems like Chrome PIP is correctly in the always on top container normally, but when a fullscreen window is activated, it disables always on top for any other windows. It doesn't put the fullscreen window into the always on top container, however. 

This is currently intended behavior for always on top windows on ChromeOS at least. That is,
always on top windows are demoted to non always on top while fullscreen window is active.

This was implemented to avoid having always on top windows while fullscreen video.

I'm not sure about other platforms though. My guess is that they have simliar logic to always on top windows,
and safari does something special?


Chaniging this behavior for PIP on ChromeOS shouldn't be hard. I'd suggest to file a separate bug for ChromeOS, and we (edcourtney@ :) can work on it.

triage