[Webkit-unassigned] [Bug 203138] New: AX: aria-checked="mixed" used on <input type="checkbox"> not speaking Mixed state to VoiceOver

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203138

            Bug ID: 203138
           Summary: AX: aria-checked="mixed" used on <input
                    type="checkbox"> not speaking Mixed state to VoiceOver
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: paul at pauljadam.com
                CC: webkit-bug-importer at group.apple.com

Steps to reproduce:

1. Turn on VoiceOver in macOS and use Safari to visit http://pauljadam.com/demos/mixed-checkbox.html
2. Set VoiceOver focus to the Select All checkbox with the mixed/indeterminate state. 

Expected results:
VoiceOver says "Select All mixed checkbox"

Actual results:
VoiceOver says "Select All unchecked checkbox"

Notes:
This works as expected in Chrome.
aria-checked="mixed" works in Safari only if the element is not a native checkbox input.

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