User interface of "content" kind

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From @alastor0325 on January 6, 2016 10:3

https://mediasession.spec.whatwg.org/#media-session-kinds

Displays lock-screen and notification area user interfaces when playback begins.

Hi, all, I would like to discuss the behavior of the "user interfaces". Here are some questions, thanks :)

• This interface is used to notify user something is playing (like notification) or control the audio playback?
  • IMMO, I hope we can use it to control the audio. ex. play, pause, next song e.t.c.
• If this interface can be used for controlling audio, when should it appear/disappear?
  • appear : when the audio started (it should be no doubt)
  • disappear : (1) when the audio pause (2) when the audio end

Copied from original issue: WICG/mediasession#120

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From @mounirlamouri on January 7, 2016 20:50

Yes, the intent is that the interface would allow the user to control the stream. Regarding when it disappears, I'm not sure how much we can make this a requirement. FWIW, Chrome is removing it if the user presses pause in the page but we just landed a change that keeps the notification in that case.

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From @foolip on January 11, 2016 13:41

What I think would make sense is if the UI remains until the session does back to the idle state. Pausing (without starting another app or in-browser media session) and a transient interruption would thus leave the UI in place.

Some (most?) native apps leave their notification even after they have lost audio focus entirely, but I don't think that's a good default behavior, at least.