Re: [webcomponents] Styling of elements where attachShadow(...) not allowed (#376)

Thank you for sharing it. I guess you are using type extension. https://w3c.github.io/webcomponents/spec/custom/#dfn-type-extension 

AFAIK, we cannot style internal of elements even if we use type extension. A type-extension just acts as *label* so that we can style elements with the label from outside, right?

Thus, backing to the proposed approach:

> Shadow Root in following elements _list_of_elements_here_ MUST contain <shadow></shadow> in the root and MAY contain any number of <style>...</style> elements for styling purposes, any other elements are NOT allowed.

I am wondering how this works and what is the expected behavior. Could you tell us the concrete example how it should work?

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