Re: [w3c/webcomponents] Add global reflecting attributes to ElementInternals? (#821)

ElementInternals is for setting internal values. `ariaPressed` will be "handled" by ElementInternals, but not in the same way that `setAttribute("aria-pressed", ...)` does. Instead it will set the default aria-pressed semantic. (Maybe we should rename it `defaultARIAPressed`.)

The example code you give doesn't seem to be a use case; I'm unclear what it's saying. Is the author trying to use title, unaware that it's a reflecting setter? Are they trying to set the title attribute, but unaware that you're not supposed to do that in constructors? I think there are clear solutions for either of those use cases (e.g., use a different name, or use connectedCallback, respectively) that don't require new spec and implementation work on ElementInternals.

So in general I agree with your last paragraph; the global attributes are generally not internal things (like default ARIA semantics are) and it doesn't make much sense to put them on ElementInternals.

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