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

As I've numerously stated in various threads & issues, the right approach is for the child to report its insertion to the parent. Waiting for all children to be parsed in order to initialize is never a good idiom because the HTML parser may pause for seconds at a time when there is a network delay.

We used to have code like that in our builtin element implementations and we still do in some cases (due to historical reasons) but almost all such code end up causing bugs. It's simply not the right pattern by which to write an element.

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