Re: [WICG/webcomponents] Web components authors are currently using ARIA in problematic ways that lead to duplicate announcements (Issue #1073)

role="none" (and its older synonym "presentation") cause an object to be removed from the a11y tree. By using that, and updating the presentational roles conflict section in the ARIA spec, we could avoid the duplicated semantics and announcements.

If referenceTarget, or some other theoretical ARIA property were invented that automatically passes ARIA attributes to an element inside of the custom element's implementation, I would expect that this is a great signal to remove the custom element from the AX tree to avoid duplication, and therefore an indicator that role="none" should be used for the custom element.

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