Re: [whatwg/dom] Make it possible to observe connected-ness of a node (#533)

rniwa left a comment (whatwg/dom#533)

> It seems that instead what most use cases need is to observe (a) `ownerDocument` changes and (b) `parentNode` changes.
> 
> Then we can get all the existing custom element lifecycle hooks:
> 
> * `connectedCallback()` → `ownerDocument` goes from `null` to a non-null value
> * `disconnectedCallback()` → `ownerDocument` changes from a non-null value to `null`

`ownerDocument` is never `null` so this won't work.


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