History of MediaDevices.getUserMedia()

Clarify that "true" for a media type means that kind of track is required

Update compat info

Add missing tags; standardize syntax for promise-based APIs.

Switched the two examples around, as constraints were not likely to work with the polyfill.

let p = foo(); p.then(() => {}); p.catch(() => {}); is an anti-pattern we should avoid. Each line returns a promise, and line 2 leaves an uncaught rejection. Instead chain head to tail.

Avoid terms that imply the promise-returning API can throw exceptions, which it can't. On failure, it returns a rejected promise with the (poorly-named) DOMException error object.

fix obsolete fitness distance link

Corrected typo in MediaStreamConstraints.