chromium/content/test/data/accessibility/html/summary-expected-mac.txt

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='details'
++++AXButton AXRoleDescription='disclosure triangle' AXTitle='details tag'
++++++AXStaticText AXRoleDescription='text' AXValue='details tag'
++AXGroup AXRoleDescription='details'
++++AXButton AXDescription='name' AXHelp='details #2' AXRoleDescription='disclosure triangle'
++++++AXStaticText AXRoleDescription='text' AXValue='details #2'