[Webkit-unassigned] [Bug 222843] New: AX: When aria-modal="true" dialog is displayed, other contents are still accessible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222843

            Bug ID: 222843
           Summary: AX: When aria-modal="true" dialog is displayed, other
                    contents are still accessible
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: macOS 11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: canhai_chen at apple.com
                CC: webkit-bug-importer at group.apple.com

When a modal dialog with aria-modal="true" is displayed, other contents are still accessible.

Steps:
1. Open https://www.w3.org/TR/wai-aria-practices-1.1/examples/dialog-modal/dialog.html
2. Enable VO and press "Add Delivery Address" to show the modal dialog
3. Press Ctrl-Opt-ArrowLeft/Right to navigate within the modal dialog
4. Press Ctrl-Opt-Shift-ArrowUp and then Ctrl-Opt-ArrowLeft to navigate out of the modal dialog

Results:
Expected: VO cannot navigate to other contents when the modal dialog is displayed.
Actual: In step 4, VO can navigate to other contents even though the modal dialog is displayed.

Notes:
In the W3 ARIA modal dialog example, you can press "Verify Address" to open another modal dialog.
When the new modal dialog is displayed, the previous modal dialog is still accessible.
The same example works fine in Chromium.

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