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

A whitelist is a safe approach, but from reading this it would seem the only elements that *really* need blacklisting are those that don't allow html / text content.

I've many times created custom buttons where I'm projecting content into them, even if it's only text-content. I've avoided using `is=""` in the past because of the contention. The only other option is to create a custom element that renders a button and project the content of the custom element into the button. Even so, there are compound components where extending a single element doesn't make sense like an input + button search component.

What about blacklisting void elements and allowing everything else?

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