Re: [w3c/webcomponents] Consider adding a childrenChangedCallback or something (#619)

@tnikolai2 

> Now in almost all implementations connectedCallback behave as connectedAndParsedChildrensCallback and child nodes are fully accessible. 

This isn't true, as I've found out in #668 (see my above comment).

@treshugart Have you encountered any issues as I described in #668? The ordering of connectedCallbacks for children of an element is up-the-tree or down-the-tree depending on situations. Also, when the direction is down-the-tree, I'm not certain that detected elements will be upgraded when I observe them.

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