NEW 189885
Picture-in-Picture cannot be initiated when tab is not visible 
https://bugs.webkit.org/show_bug.cgi?id=189885
Summary Picture-in-Picture cannot be initiated when tab is not visible
rob.stone
Reported 2018-09-22 08:21:11 PDT
When attempting to initiate picture-in-picture mode with `webkitSetPresentationMode("picture-in-picture")` while the tab is not visible, the following error occurs: `HTMLMediaElement::enterFullscreen(C4262CD8) returning because document is hidden`. While full screen mode should not be allowed to initiate when tab is not visible, picture-in-picture should not be subject to this same rule.
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Alexey Proskuryakov
Comment 1 2018-09-22 15:00:59 PDT
What is the scenario where a user would want an invisible tab to start PiP?
rob.stone
Comment 2 2018-09-22 19:53:06 PDT
When navigating to another tab or app, it is convenient to automatically invoke picture-in-picture as occurs on iPad. Undesired launches of picture-in-picture mode would not be likely due to the rules on auto-play media.
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