Re: [whatwg/dom] Proposal: asynchronous event listeners (Issue #1308)

> (But, I don't quite see how waitUntil should help make the initial event dispatch async...)

example code I had in mind:

```js
anything.addEventListener('name', (event) => {
  event.waitUntil(new Promise(async (res, rej) => {
    const thing = await (await fetch(permision)).text();
    if (thing === 'OK') {
      event.stopPropagation();
      event.preventDefault();
      return resolve();
    }
    reject();
  }));
});
```

This idea won't need any execution priority expectation, it would just flag that event as "*unresolved*" until whatever asynchronous thing needed to eventually keep going happens.

I hope this makes sense.

Original proposal + discussion: https://github.com/whatwg/html/issues/9540

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