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

AXWebArea
++AXList AXOrientation='AXVerticalOrientation' AXSelectedChildren=[:4] AXVisibleChildren=[:3, :4, :5]
++++AXStaticText AXValue='1'
++++AXStaticText AXValue='2'
++++AXStaticText AXValue='3'