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

Fix #453
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/660

-- Commit Summary --

  * define a "has listeners for" algorithm on EventTarget

-- File Changes --

    M dom.bs (12)

-- Patch Links --

https://github.com/whatwg/dom/pull/660.patch
https://github.com/whatwg/dom/pull/660.diff

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