Re: [w3c/webcomponents] [idea] childConnectedCallback and childDisconnectedCallback (#550)

> I just gave it a try, and it seems to return false on elements in a shadow root

Yeah, I don't use Shadow DOM much so I haven't thought about it. The @rniwa solution looks way better but I wonder if that should be a WHATWG proposal instead of just a comment in some discussion, 'cause it's very handy and easily badly replaced (see my suggestion, as example).

> a MutationObserver should be cleaned up

I think it's unnecessary, like @rniwa suggested, so it'd be unnecessary.

Same goes for listeners, the constructor is the place to add these or remove these, while reaction can be different based on the node state.

Adding and removing too much on each connect/disconnect is not better, IMO, just slower and, in this case, simply over complicated for no gain.

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