Re: [whatwg/dom] Improving ergonomics of events with Observable (#544)

@jakearchibald Sync dispatch in userland EventTargets is already a pretty big footgun IMO (ie reentrancy). There are already good reasons why EventTarget vendors should wait until the job queue is drained before looking for a cancellation.* Failing that, the aforementioned `do` method will allow developers to synchronously cancel the minority of EventTargets that do sync dispatch (https://github.com/whatwg/dom/issues/544#issuecomment-351455482)

* Perhaps this can be encouraged by providing a convenience asyncDispatchEvent method on EventTarget that returns a Promise? 

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