[Webkit-unassigned] [Bug 244090] New: AX: Safari + Voiceover don't read some ShadowDOM elements's aria-label if there's a aria-modal=true

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244090

            Bug ID: 244090
           Summary: AX: Safari + Voiceover don't read some ShadowDOM
                    elements's aria-label if there's a aria-modal=true
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gooz at foojin.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

Reproduced on Safari 15.6 & MacOS 11.6.8 and 12.5

Testcase: https://codepen.io/GoOz/pen/MWVZXZQ

Actual results:
If there's an aria-modal attribute set to true somewhere on the page, aria-labels from shadowDOM elements outside the modal element OR inside it but with the aria-label inside its own shadowDOM won't be read by Voiceover.
Removing the aria-modal="true" attribute will read all of them but that's not an option for the sake of a11y.

Expected results: 
Voiceover should read shadowDOM elements aria-labels

Possibly related to https://bugs.webkit.org/show_bug.cgi?id=174667

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