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

Well, until we had webcomponents it wasn't an issue: whether or not one element was a subclass of another was implementation-dependent and not exposed to web developers. Now it is: thanks to webcomponents we can create custom tags that can inherit from each other. Even the heading element is bounded: there are only so many of them and typing out `h1, h2, h3...` is not that big of a deal. But allowing arbitrary subclasses opens the door to the need to select everything that is-a foo-x.

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