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

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='This test is to check '
++++AXGroup AXRoleDescription='highlight'
++++++AXStaticText AXRoleDescription='text' AXValue='mark tag'
++++AXStaticText AXRoleDescription='text' AXValue='.'