Re: [w3c/webcomponents] Disallow attachShadow(...) for some elements. (#110)

> The fact these elements are implemented using shadow DOM would mean that we'd have to define exactly what happens when an author defined shadow root is attached

I imagined those UAs would be required to behave the same way as those which chose a different implementation strategy, not involving shadow DOM. Or is it a future compatibility concern whereby the UA's shadow tree in v2 would be somewhat exposed for integration with author's shadow trees? (Then it makes sense what I've recently read in some draft I cannot find, that using shadow DOM for implementing some elements is the default and some slots must be exposed even if an UA doesn't  use shadow DOM internally – it must behave as if it did.)

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