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

AXWebArea AXRoleDescription='HTML content'
++AXButton AXRoleDescription='button' AXTitle='Native button'
++AXButton AXRoleDescription='button' AXTitle='ARIA button'
++AXButton AXRoleDescription='clicky' AXTitle='Clicky button'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='foo'
++AXGroup AXDescription='bar' AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='bar'
++AXGroup AXRoleDescription='texty'
++++AXStaticText AXRoleDescription='text' AXValue='baz'
++AXGroup AXSubrole=AXApplicationGroup AXRoleDescription='supercontainer'
++++AXStaticText AXRoleDescription='text' AXValue='SuperContainer group'