Are there any good prior discussions on grouping elements inside of a combobox, either in ARIA or HTML datalist? Not much I& #39;ve been able to find that goes too deep on the topic.
- datalist doesn& #39;t support optgroup, though there have been hacky workarounds and one limited, closed issue in the w3c repo requesting it

- ARIA spec doesn& #39;t mention grouping in the context of combobox. It& #39;s permitted in listbox generally
In most examples I find, the groups have no affect on filtering/matching logic. I wonder if there& #39;s a case where it might reasonably be expected that they do, and if so, what are the accessibility implications?
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