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

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='group'
++++AXStaticText AXRoleDescription='text' AXValue='The '
++++AXGroup AXDescription='World Health Organization' AXRoleDescription='group'
++++++AXStaticText AXRoleDescription='text' AXValue='WHO'
++++AXStaticText AXRoleDescription='text' AXValue=' was founded in 1948.'