Re: [w3c/webcomponents] [feature request] change when upgrade/connected happens during parsing, so that it is the first event in the following microtask (#787)

And then there's the issue of whether or not those children are defined or not, if they're elements with hyphens in their names.

So if we are using React, which will create elements without them being `isConnected` and eventually placing them into the DOM, we'll certainly have this problem.

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