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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html Multipage: http://www.whatwg.org/C#the-dfn-element Complete: http://www.whatwg.org/c#the-dfn-element Comment: No attribute quotes? Posted from: 12.2.10.242 User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.39 Safari/536.11
They are optional.