[Webkit-unassigned] [Bug 212471] New: AX: VoiceOver does not announce changes to aria-expanded state for ARIA combobox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212471

            Bug ID: 212471
           Summary: AX: VoiceOver does not announce changes to
                    aria-expanded state for ARIA combobox
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: todd.kloots at gmail.com
                CC: webkit-bug-importer at group.apple.com

VoiceOver does not announce changes to the aria-expanded state for the ARIA combobox pattern. As a consequence, there is no audio cue for when the list of options is available.

To verify:

1. Open the "Editable Combobox With List Autocomplete Example" in either Chrome or Safari https://www.w3.org/TR/wai-aria-practices-1.2/examples/combobox/combobox-autocomplete-list.html
2. Start VoiceOver
3. Move focus to the input for the ARIA combobox
4. Type "a"
5. Notice there is no audio queue when the list of results is displayed

The same is true of the following ARIA 1.0 combobox example: 
https://webkit.org/blog-files/aria1.0/combobox_with_live_region_status.html

In this example, an ARIA live region is used to communicate the number of visible results.


In contrast, VoiceOver DOES announce changes to the aria-expanded state when used with the ARIA Menu button pattern:
https://www.w3.org/TR/wai-aria-practices-1.2/examples/menu-button/menu-button-actions-active-descendant.html

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