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See http://lists.w3.org/Archives/Public/www-style/2009Oct/0181.html I think we should do a variation of (3): Allow @namespace to be added, changed and removed iff there is nothing but @charset, @import and @namespace in the style sheet. Otherwise throw InvalidStateError.
https://dvcs.w3.org/hg/csswg/rev/3107fd009af7
Reopening this to suggest that the change is reverted. Making this mutable seems like more implementation and testing work than it's worth. Context: https://groups.google.com/a/chromium.org/d/msg/blink-dev/0zvcEnGeiRY/IwzfqRKy4NsJ
https://github.com/w3c/csswg-drafts/commit/30e20e422dfd868903c438206687e150607fe6d4