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

@annevk, then suggestion is something like:
> Shadow Root in following elements \_list_of_elements_here_ MUST contain `<shadow></shadow>` (or whatever is currently in spec) in the root and MAY contain any number of `<style>...</style>` elements for styling purposes, any other elements are NOT allowed.

I'm really trying to find replacement for `/deep/` that is used currently for this purpose.

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