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

FWIW, I somewhat agree with @bkardell that it needs to be generic, but I think there are specific concerns here that only apply to custom elements. (To some extent they apply to normal elements too, e.g., if you do `.__proto__ = null` the selectors still needs to match since the value(s) has to be frozen, but with custom elements it's a little unclear what you would match against.)

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