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chromium/content/test/data/accessibility/css/pseudo-element-positioned-expected-mac.txt 

AXWebArea
++AXStaticText AXValue='Empty before and after'
++AXGroup
++++AXStaticText AXValue='Empty positioned before and after'
++AXGroup
++++AXStaticText AXValue='pseudo'
++AXStaticText AXValue='Positioned before and after with content'
++AXGroup
++++AXStaticText AXValue='pseudo'