Audio focus enforcement on desktop platforms

[steimelchrome]

The explainer states that certain AudioSessionTypes should pause other audio (e.g. "transient-solo"). Is it a requirement that the user agent enforce this on all platforms when the website sets this type? I know on desktop today Chrome purposely doesn't enforce audio focus since desktop is more multi-task-friendly and the user does not expect audio to prevent other audio.

[youennf]

I would hope we can get agreement on enforcing focus within a top level browsing context, in particular if we allow to create AudioSessions.

With regards to enforcing focus between tabs, I think it should indeed be left to the UA.