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

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='Before.'
++AXSplitter AXDescription='Dividing line' AXRoleDescription='splitter'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='Middle.'
++AXSplitter AXRoleDescription='splitter'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='After.'