WPT details: https://github.com/w3c/web-platform-tests/tree/master/remote-playback
This specification defines an API extending the HTMLMediaElement that enables controlling remote playback of media from a web page. In M56, this will work on Android only (desktop will report no devices available) with the desktop backend being added later.
Samples: https://beaufortfrancois.github.io/sandbox/media/remote-playback.html https://avayvod.github.io/remote-playback/test.html