Re: [w3c/webcomponents] connectedCallback timing when the document parser creates custom elements (#551)

You can't rely on children in the constructor, that will only be the case for upgrades.  Better to have your framework/library implement a hook for when children are ready.  A childrenChangedCallback would be nice too, maybe we should take the discussion over there.  https://github.com/w3c/webcomponents/issues/550

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