Re: [whatwg/dom] Consider adding localNameFilter to MutationObserver (#398)

LeaVerou left a comment (whatwg/dom#398)

One tricky bit is that for `attributes` and `characterData` mutations you want to be filtering by the *target*, but for `childList` mutations, you want to be filtering the `addedNodes` and `removedNodes`. Most use cases are about tracking added or removed elements of a certain type, not elements added and removed within a parent of a certain type. However, there is no precedent for a MO option that works this way.

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