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chromium/content/test/data/accessibility/aria/aria-listbox-expected-mac.txt 

AXWebArea AXRoleDescription='HTML content'
++AXList AXRoleDescription='list box'
++++AXStaticText AXRoleDescription='text' AXValue='Item 1'
++++AXStaticText AXRoleDescription='text' AXValue='Item 2'
++++AXSplitter AXRoleDescription='splitter'
++++AXStaticText AXRoleDescription='text' AXValue='Second group item 1'
++++AXStaticText AXRoleDescription='text' AXValue='Second group item 2'