[webcomponents] When does the base element queue matter? (#457)

@dglazkov @coonsta, could use your help here. Maybe @rniwa has also run into this while implementing.

I can't think of a situation in which the current element queue = the base element queue. I think maybe in the past that would be true during initial HTML parsing, but since we moved to synchronous construction during parsing that should no longer be the case.

Are there other cases that I am missing? It seems quite possible.

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