Media Session API: enterpictureinpicture action

Category: Multimedia
Type: No developer-visible change
Status: Enabled by default (Chrome 120)
Intent stage: Start prototyping

Summary

Adds an 'enterpictureinpicture' action to the Media Session API. Websites can register an action handler which can be used to open a Picture-in-Picture or Document Picture-in-Picture window.

Standards & signals

Specification: https://github.com/w3c/mediasession/pull/295
Firefox: No signal
Safari: No signal — Generally positive feedback when discussed in the Media WG, but no official position pursued due to the small nature of the change
Web developers: Positive — The above citation is one example amongst many where developers want to be able to initiate pip through other means (e.g. automatically when switching tabs or when a picture-in-picture button is pressed in browser UI), and having a media session action for this enables the UA to allow the website to open a picture-in-picture window in these cases
Tracking bug: https://crbug.com/1457056

Samples: https://steimelchrome.github.io/autopip.html

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