[Webkit-unassigned] [Bug 236881] New: AX: aria-expanded is blocking VO click events on comboboxes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236881

            Bug ID: 236881
           Summary: AX: aria-expanded is blocking VO click events on
                    comboboxes
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aron_j at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Hello

I've noticed a bug specific to Safari. When using VoiceOver, I'm able to send a click event (VO+Space) to an element with the role="combobox" attribute only when it does not have the aria-expanded attribute. Once the attribute is set, regardless of its value, the click action does not work. I'm able to send the click event for comboboxes with aria-expanded in Chrome and Firefox.

See the live example of a select only combobox in the ARIA authoring practices- https://www.w3.org/TR/wai-aria-practices-1.2/examples/combobox/combobox-select-only.html
If you remove the aria-expanded="false" from the element in the web inspector and try sending the click- it will work- the listbox popup will expand.

Some other notes:
- it seems that Safari is treating an element with role="combobox" and aria-expanded="false" as if it was expanded as it begins the announcement with the word "confirm",
- aria-expanded is a required state as per the ARIA spec (https://www.w3.org/TR/wai-aria-1.1/#combobox) meaning that it must be present at all times
- the issue will be highly problematic once ARIA 1.2 turns into a recommendation (currently in candidate recommendation meaning it is close to become the spec) as 1.2 officially acknowledges comboboxes as select-only and text field comboboxes whereas previous versions were treating this element as if it always had to have a text box.

Alos, see the attached aria-ExpandedComboboxIssue.html file that shows the issue but displaying the system alert dialog on click.

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