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)

> The actual question I have is why would a reader conclude that it would be possible for getUserMedia() to capture from output devices when its definition mentions only input devices.

Because

> `MediaDeviceKind` Enumeration description
> `audiooutput` | Represents an audio output device; for example a pair of headphones.

at least amends, if not repeals and substitutes for

>  Note that this document describes the use of microphone and camera type sources only

by implication.

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