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documentadoptnode26, 27 and maybe many more tests call setAttributeNS with a null for the value parameter. The spec does not require that implementations treat that as an empty string as Xerces-J does, they could through an implementation exception which would cause these tests to fail. I will need to survey the tests by running them against a hacked version of Xerces to identify call the tests affected by this issue.
Created attachment 241 [details] Eliminated calls to setAttributeNS(ns, name, null)