Re: [w3c/webcomponents] Add a CSS subtype selector. (#719)

@bkardell Ah, the wiki, of course. Thanks, this helps a lot!

Yes, this issue probably would belong more in [w3c/csswg-drafts](https://github.com/w3c/csswg-drafts) than here in w3c/webcomponents. And whatever approach should be as applicable to built-in `Element` subclasses as they would be to custom ones…Come to think of it, using custom-element tags would be problematic here because many useful `Element` subclasses, such as `HTMLHeadingElement`, have no tag; similarly, custom element subclasses may have no registered tag, yet one may want to select all elements that in turn inherit from them.

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