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

> In enqueue a custom element callback reaction, it adds to the backup element queue.

I think you are correct that the spec says this, but this also seems wrong. The backup element queue should be avoidable when we are doing parsing; it should only be used for things like editing. We should be able to just use the element queue created for that element.

That would make connectedCallback be called with zero children, right? That sounds much better.

I am not sure what the best spec fix is for this---it is getting late over here---but maybe it would suffice to just push an element queue in "insert a foreign element", then pop it and run reactions? Better suggestions appreciated.

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