Re: [whatwg/dom] Declarative Shadow DOM (#831)

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> b. In the "backwards" case, the `attachShadow()` call from the component "wins" the race. Then the declarative content finishes parsing, and the parser tries to attach the declarative shadow root. In this case, that attachment will fail, and the declarative contents will be discarded. Here again, not performance-ideal, but everything keeps working correctly.

I don't think this behavior is acceptable. There needs to be a way for a component to let the declarative content arrive into its shadow root. Maybe we need an option to attachShadow which indicates whether the declarative content could be inserted or not.

Also, this poses another problem. Since the component would never know when the children had finished parsing, there is no point in which the component is safe to attach a shadow root until your sibling or your ancestor's sibling starts appearing. Having to write that kind of code manually everywhere seems very fragile & developer hostile.

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