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

I am not sure how to deal with accessible states and properties yet, but a callback might be sufficient for the cases where the AT "pulls" information from the element. I think there are cases where the element "pushes" information to the AT (announcements of important state changes) which might not be implementable that way.

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