Re: [w3c/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

@domenic 

> In that case I think we should also seriously consider un-deprecating `DOMNodeRemoved`/`DOMNodeInserted` as an API shape, since that already exists in some browsers and we've needed to spec it properly for some time.

Alternatively, we could have a `{ sync: true }` option on mutation observers, which would fire immediately rather than on microtask. Then things like `childList` remain opt-in.

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