[Feature Request] Document PiP about sync

[Xaekai]

I am among the people who spearheaded/promoted the existence of the dPIP work. You can rest assured that custom subtitle support in PIPs will be coming once Mozilla is onboard with the feature too.

calzone: they want a solution for this. When you activate PIP/video popout mode, layered elements like canvas generated subtitles do not come along for the ride. I agree we should wait for Firefox to support this feature as well before including it in core.

[calzoneman]

Hi,

It seems like this feature isn't available in Firefox; I usually try to constrain core features to things that are standardized and work across all major browsers to reduce user confusion and troubleshooting burden.

Could you explain a little more about the problem you were trying to solve by requesting this feature? There may be an alternative way to support the use case that doesn't rely on nonstandard features.