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

https://github.com/whatwg/html/issues/83 contains a proposal for a `:heading(level)` pseudo-class. I think what's useful there is a little different from an interface-based selector though.

I'm not entirely sure how interface-based selectors would work though. I could imagine using https://github.com/heycam/webidl/issues/97, but that won't be as useful for custom elements, though I suppose we can make it work somehow. (Note that we cannot directly poke at JavaScript, it'll have to be some value(s) that cannot ever change that selectors can match against.)

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