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chromium/content/test/data/accessibility/event/add-alert-expected-mac.txt 

AXLiveRegionChanged on AXGroup AXDescription="a"
AXLiveRegionChanged on AXGroup AXDescription="b"
AXLiveRegionChanged on AXGroup AXDescription="c"
AXLiveRegionCreated on AXGroup AXDescription="a"
AXLiveRegionCreated on AXGroup AXDescription="b"
AXLiveRegionCreated on AXGroup AXDescription="c"