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Specification: http://www.whatwg.org/specs/web-apps/current-work/ Multipage: http://www.whatwg.org/C#obsolete-permitted-doctype-string Complete: http://www.whatwg.org/c#obsolete-permitted-doctype-string Comment: HTML 4 and XHTML 1 Transitional doctypes should be included as obsolete permitted doctypes Posted from: 86.161.69.5 User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:11.0) Gecko/20100101 Firefox/11.0
They are omitted because they trigger quirks mode.