Re: [whatwg/dom] Event delegation via EventListenerOptions (#215)

> I was thinking matches would just filter on event.target, but I might be missing a subtlety.

Yeah, a rough implement usually looks something like:

``` js
document.addEventListener('click', function(event) {
  var delegateTarget = this
  var currentTarget = event.target.closest('.foo')
  if (!currentTarget) {
    return
  }

  // ...
})
```

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