Re: [webcomponents] [Accessibility]: Custom element should allow declaration of default accessibility features, such as role and other ARIA attributes. (bugzilla: 20466) (#159)

Right, but how would we do `aria-checked`, for instance? It seems important to consider the full picture here. Either, like with a potential `defined` promise, we do some kind of prototype munging, maybe based on the passed role value, or we have some kind of `HTMLCustomElement` interface inbetween.

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