Should users be allowed to override 'playback' with 'ambient'?

[tguilbert-google]

If two sites both mark their AudioSessionType as playback, will a user be able to override it to be ambient instead?

E.g. if there is music playing on one site and a user wants to play a spoken word video on a different site, and both sites are using playback, will there be a way to allow users to play the music and the video simultaneously?

This might be more relevant for desktop than mobile.

[youennf]

On desktop, I believe that, by default, two AudioSessions of type playback on different tabs will not suspend each other.
I believe the UA is free to implement what it wants there.

Some UAs already provide ways to mute a tab. I guess it would be ok for a UA to allow user to make a tab as interruptible or mixing with others.