As mentioned in bug 1278516, the 'DOM4' and 'DOM WHATWG' need to be added to the pages containing the API of the outdated Selectors API Level 2 spec. Those APIs were merged into the ParentNode interface. Sebastian  https://developer.mozilla.org/en-US/docs/Web/API/parentNode
Assignee: nobody → sebastianzartner
Status: NEW → ASSIGNED
See Also: → bug 1342789
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