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

AXWebArea AXRoleDescription='HTML content'
++AXList AXRoleDescription='list box'
++++AXStaticText AXRoleDescription='text' AXValue='option 1'
++++AXStaticText AXRoleDescription='text' AXValue='label 2'
++++AXStaticText AXRoleDescription='text' AXValue='caterpillar'
++++++AXStaticText AXRoleDescription='text' AXValue='cat'
++++++AXGroup AXSubrole=AXStrongStyleGroup AXRoleDescription='strong'
++++++++AXStaticText AXRoleDescription='text' AXValue='erpillar'
++++AXStaticText AXRoleDescription='text' AXValue='catfish'
++++++AXStaticText AXRoleDescription='text' AXValue='cat'
++++++AXGroup AXSubrole=AXEmphasisStyleGroup AXRoleDescription='emphasis'
++++++++AXStaticText AXRoleDescription='text' AXValue='fish'
++++AXStaticText AXRoleDescription='text' AXValue='jellyfish'
++++++AXGroup AXSubrole=AXEmphasisStyleGroup AXRoleDescription='emphasis'
++++++++AXStaticText AXRoleDescription='text' AXValue='jelly'
++++++AXStaticText AXRoleDescription='text' AXValue='fish'