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

It's unfortunately [notoriously difficult](https://stackoverflow.com/questions/44935865/detect-when-a-node-is-deleted-or-removed-from-the-dom-because-a-parent-was) to do with MutationObserver, and pretty much guaranteed to be buggy (due to it being batched) and inefficient (having to watch every change on the entire document). 

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