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

Apparently, because children can not be observed during parsing with `Promise.resolve` as I show above, and all macrotasks fire after parsing, this means that the parsing mechanism has some other sort of task which is between microtask and macrotasks. It seems as though the parser fires connectedCallbacks between each queue if microtask during parsing, and it is therefore impossible to defer with microtasks to detect children.

I don't know if this is part of spec though, but IMO definitely not ideal because it shows some behavior that isn't a normal part of what people expect from JavaScript.

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