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

It wasn't clear from the original thread what the use cases were. @pemrouze just said it would be nice, then people started discussing how. We never even talked about why they couldn't use custom elements.

I agree that if we had a need for this ability extending MutationObserver would be the way forward but I'd like some more justification in the form of concrete use cases that are hard to accomplish with custom elements.

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