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

Why exactly can't preventDefault or respondWith be called after a microtask? It's not as if we're letting timers run ahead of them?

A smart implementation would need to allocate very few promises anyway.

That said:

> However, I think observables are a nicer fit conceptually since they're push streams and model clicks much more naturally. Even if you'd use async iterators you'd bastardize them to act like observables in this case though a function that consumes from the iterators as elements enter the iteration. With observables it's just subscribe.


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