[Webkit-unassigned] [Bug 222394] New: AX: WebKit reports no children for treeitems in W3 ARIA tree example, causing VO unable to interact with the tree.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222394

            Bug ID: 222394
           Summary: AX: WebKit reports no children for treeitems in W3
                    ARIA tree example, causing VO unable to interact with
                    the tree.
           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

Created attachment 421488

  --> https://bugs.webkit.org/attachment.cgi?id=421488&action=review

Screen recording shows VO unable to interact with W3 ARIA tree example in Safari

WebKit reports no children for treeitems in W3 ARIA tree example, causing VO unable to interact with the tree.

Steps:

1. Open https://www.w3.org/TR/wai-aria-practices-1.1/examples/treeview/treeview-2/treeview-2a.html for the W3 ARIA tree example
2. Enable VO, and navigate to the "food" tree example
3. Press Ctrl-Opt-Shift-Down to interact with the tree table

Results:

Expected: VO can interact with the tree table and focus on the first tree-item
Actual: VO cannot interact with the tree table. It appears that the table is empty

Notes:

Using accesstool and VO to debug shows that WebKit reports each row has nil children.

The W3 ARIA tree example works fine with VO in Chrome.

Attached a screen recording shows VO unable to interact with W3 ARIA tree example in Safari. The tree seems empty.

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