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Greetings,
I noticed that the Combobox listbox popup does not use the aria-selected
attribute to communicate the currently selected option in the popup.
According
to the WAI-ARIA Authoring Practices Guide, "For a combobox that controls a
listbox, grid, or tree popup, when a suggested value is visually indicated as
the currently selected value, the option, gridcell, row, or treeitem containing
that value has aria-selected set to true."
I believe the aria-selected attribute can be argued to be necessary to
communicate the state of the combobox component, and therefore missing it would
be an accessibility issue under the WCAG 4.1.2 criterion.
Setting aria-selected="true" for the currently selected listbox option should
resolve the issue.
I tested by using your Default Functionalities Demo and looking at the listbox options while using it. I have attached a screenshot below.
If you need more information, please let me know. Thank you!
Ken Watson