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

AXWebArea
++AXList AXDescription='My Listbox'
++++AXStaticText AXValue='Example 1 not selected'
++++AXStaticText AXValue='Example 2 not selected'
++++AXStaticText AXValue='Example 3 not selected'
++++AXStaticText AXValue='Example 4 not selected'
++AXList AXDescription='My Listbox'
++++AXStaticText AXValue='Example 1 not selected'
++++AXStaticText AXValue='Example 2 selected'
++++AXStaticText AXValue='Example 3 not selected'
++++AXStaticText AXValue='Example 4 selected'