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

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='group'
++++AXPopUpButton AXRoleDescription='pop up button' AXValue='Placeholder option'
++++++AXMenuItem AXRoleDescription='menu item' AXValue='Placeholder option'
++++AXPopUpButton AXRoleDescription='pop up button' AXValue='Option 2'
++++++AXMenuItem AXRoleDescription='menu item' AXValue='Option 2'
++++AXPopUpButton AXRoleDescription='pop up button' AXValue='Option 1'
++++++AXMenuItem AXRoleDescription='menu item' AXValue='Option 1'
++++AXList AXRoleDescription='list box'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 1 not selected'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 2 not selected'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 3 not selected'
++++AXList AXRoleDescription='list box'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 1'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 2'
++++++AXStaticText AXRoleDescription='text' AXValue='Option 3'