What is the scope and defaulting rules of an AudioSession

[youennf]

If top level frame has set an audio session, it will be used by its HTMLMediaElements (if HTMLMediaElements do not have an explicit audio session).
What about same origin iframes of this top level frame, if they do not have set an audio session themselves?

[youennf]

Tentative TPAC 2024 proposal:

• Consider each context has a default audioSession that applies by default to all elements of the context.
• Individual elements can override the default audioSession with constructed ones (or the default of another same origin context).
• Use iframes hierarchy as audioSession hierarchy.