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MediaDevices.getUserMedia()


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

MediaDevices.getUserMedia()


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.

MediaDevices.getUserMedia()


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.

MediaStream


MediaStream()