Re: [whatwg/dom] Define a "has listeners for" algorithm on EventTarget (#660)

Ok thanks, I think an example of callers would be Step 9 of [unload a document](https://html.spec.whatwg.org/multipage/#unload-a-document), which I guess could read like:
*If document's Window object **has any event listeners** that were triggered by the earlier unload event step(...)*

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