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chromium/content/test/data/accessibility/html/checkbox-name-calc-expected-mac.txt 

AXWebArea
++AXCheckBox AXDescription='Title0'
++AXCheckBox AXHelp='Title1' AXTitle='Label1'
++AXCheckBox AXDescription='AriaLabel2' AXHelp='Title2'
++AXCheckBox AXHelp='Title3' AXTitle='LabelledBy3'
++AXCheckBox AXTitle='LabelledBy4' accessibilityCustomContent=[{label: 'description', value: 'DescribedBy4'}]
++AXCheckBox accessibilityCustomContent=[{label: 'description', value: 'DescribedBy5'}]