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http://lists.w3.org/Archives/Public/www-dom/2011JulSep/0153.html AKA: allow people to shoot themselves in the foot? And if so, how exactly?
The Gecko bug that originally inspired the xmlns check is https://bugzilla.mozilla.org/show_bug.cgi?id=315805 xmlns check removed in: https://bitbucket.org/ms2ger/dom-core/changeset/be5e0ad2b1f0 Next: namespace algorithms.
Should we remove xmlns and xml attribute name checks from setAttributeNS()? Given that setAttribute() does not care, they are pointless.
https://bitbucket.org/ms2ger/dom-core/changeset/45e27eda949d (minor namespace algorithm fix)
Comment 2 is now bug 16648.