Re: [whatwg/dom] Consider adding Promise-based API for listerning event (#333)

I don't care for for the key event example @domenic  provided there. At least for keyboard events we want to take advantage of threaded scrolling. But having javascript filter every key event prevents that so a filter on the registered event listener is best for the UA for some apps that only care about certain keys; like 'Enter'. Then PageUp/PageDown can be accelerated and not dispatch javascript at all. But +1 for Observables.

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