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

AXWebArea AXRoleDescription='HTML content'
++AXGroup AXRoleDescription='group'
++++AXGroup AXRoleDescription='group'
++++++AXComboBox AXRoleDescription='combo box' AXValue='Option 1'
++++++++AXGroup AXRoleDescription='group'
++++++++++AXStaticText AXRoleDescription='text' AXValue='Option 1'
++++AXGroup AXRoleDescription='group'
++++++AXComboBox AXRoleDescription='combo box' AXValue='Option 1'
++++++++AXStaticText AXRoleDescription='text' AXValue='Custom selectlist button'