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

I'm not sure adding a class is either a very high barrier or actually even wonky in terms of 'current state of things'.  For example, there is no way to select `HTMLHeadingElement` and apply a style to all of the tags based on that interface.... currently. In that particular case, there's been much discussion/proposals around what to do (deliberately exposed pseudo-classes for them is one way - if that's the answer, then adding a class is a real good approximation, another is for allowing author defined aliases so additional sorts of things are possible).  I'm not entirely sure what the 'right' answer is, but this feels like a question about DOM/CSS more generally than web components specific to me.

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