Re: [whatwg/dom] MutationObserver needs an equivalent of disconnected & connected callbacks (#533)

This would be useful for polyfilling custom elements, but obviously that's not a good use case for why custom elements aren't enough.

If I can page in my requests around MutationObservers one had to do with observing access shadow boundaries so we don't have to patch attachShadow, which might be relevant here, and have some way of unobserving nodes outside of disconnect(), say when the nodes are disconnected.

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