Re: [mediacapture-main] Clarify getUserMedia({audio:{deviceId:{exact:<audiooutput_device>}}}) in this specification mandates capability to capture of audio output device - not exclusively microphone input device (#650)

@guido 

> Correct. It does not mean capturing audio output. It means playing audio, not capturing it.

Reads that way from perspective here.

Performs that way at Firefox, Nightly.

> I propose we close this issue since getUserMedia() is not intended to capture audio from devices marked as audiooutput by enumerateDevices() and I think there is no doubt about it.

There is far more than doubt. It is already currently possible to capture audio output excludively at Firefox and Nightly.

You, or someone else, needs to include that exact language in the specification, and remove `"audiooutput"` altogether if that is what you want, otherwise what you ask for is an absurd interpretation of `"audioouput"` and headphones.

At which specification should the PR be filed to specifically add capture of audio output, after you include language which prohibits capturing audio output - as that is very much unclear right now?

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