Re: [w3ctag/design-reviews] [WebComponents] Custom state pseudo class (#428)

@tkent-google I have simply red [the documentation](https://wicg.github.io/custom-state-pseudo-class/) where `this._internals = this.attachInternals();` happens in the first example, and I would expect every DOM element capable of relating `ElementInternals` to any DOM node.

If this works *only* with Custom Elements, or even worse, with CE that use Shadow DOM, this proposal is not really beneficial for the Web, as CE, and especially the unpolyfillable (in a reliable way) Shadow DOM, are not the most common primitives out there.

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