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When running with the default options (i.e no doctype or fbd set) on documents without a doctype declaration, check outputs both warning 09 ("DOCTYPE Fallback in effect!" - stating a fallback to HTML 4.01 Transitional) and warning 16 ("No DOCTYPE Found! Falling Back to XHTML 1.0 Transitional.") It should probably be only warning 16. Testable on current dev version at http://qa-dev.w3.org/wmvs/HEAD/check?uri=http%3A%2F%2Fvalidator.w3.org%2Fdev%2Ftests%2Fxhtml1-missing-doctype-and-xmlns.html&charset=%28detect+automatically%29&doctype=Inline&ss=1
*** This bug has been marked as a duplicate of 1134 ***