Bug 280837 – HTMLVideoElement#requestPictureInPicture does not respect transient gesture activation

• Status: NEW
• Component: Media

[Jim]

The Picture-in-Picture API specification (https://fullscreen.spec.whatwg.org/#api) describes "transient activation" as a sufficient condition for permitting the usage of HTMLVideoElement#requestPictureInPicture, but Safari appears to only permit usage of this API when _currently processing_ a gesture rather than checking for transient activation.

For example, given the following DOM structure:

<webpage src="https://foo.com">
  <iframe src="https://bar.com" allow="picture-in-picture">
    <video .../>
  </iframe>
</webpage>

...a gesture activation within the root page (foo.com) cannot be used (via <iframe> #postMessage communication) to call Picture-in-Picture APIs in the child frame (bar.com). This is unexpected.

[Radar WebKit Bug Importer]

<rdar://problem/137233559>