Re: [webcomponents] Enumerate the element names which don't support createShadowRoot(), instead of looking at the binding property (#110)

@annevk it turns out HTML kind of does set a flag, but it sets it in a strange way, by in the UA stylesheets section saying that elements have a `binding` CSS property (like `binding: button;`): https://html.spec.whatwg.org/#bindings

This is all done in terms of a not-implemented spec, http://www.w3.org/TR/becss/.

This seems pretty weird and maybe something that should be fixed in HTML to go with a more flag-like approach...

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