[Webkit-unassigned] [Bug 180866] New: AX: macOS VoiceOver doesn't announce when details element is expanded when using role group

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180866

            Bug ID: 180866
           Summary: AX: macOS VoiceOver doesn't announce when details
                    element is expanded when using role group
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: anika.henke at digital.cabinet-office.gov.uk
                CC: webkit-bug-importer at group.apple.com

When you expand a details element which has the ARIA role "group" or access one which is already expanded, it wrongly announces that it is collapsed in VoiceOver on OS X 11.

Steps to reproduce:
1. Activate VoiceOver on OS X
2. Open http://jsbin.com/cequcu in Safari
3. Navigate to the first details element ("Open this")
4. Hit the space bar to open the element

Result:
VoiceOver says "Open this, collapsed, summary".

Expected:
VoiceOver should say "Open this, expanded, summary" like it does in the second example (which doesn't include the group role).

Although the group role is the default implicit role of the details element [http://w3c.github.io/html/interactive-elements.html#elementdef-details] and it is recommended not to use it in such a case [http://w3c.github.io/html/dom.html#do-not-set], it should also not make the element behave any differently.

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