aria
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Allow posinset/setsize for toolbars
This is a follow on issue to #1721, specifically this comment/discussion in the minutes about allowing toolbars to either implicitly add an X of Y to controls within - or to allow authors to add an X of Y to controls within a toolbar via aria-posinset and aria-setsize.
Discussed briefly in today's triage: https://www.w3.org/2024/04/18-aria-minutes.html#t01