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Specification: https://html.spec.whatwg.org/multipage/semantics.html Multipage: https://html.spec.whatwg.org/multipage/#standard-metadata-names Complete: https://html.spec.whatwg.org/#standard-metadata-names Referrer: http://wordpress.stackexchange.com/questions/144462/meta-title-w3c-validation-error-with Comment: Bad value title for attribute name on element meta: Keyword title is not registered. Posted from: 27.251.71.10 User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:34.0) Gecko/20100101 Firefox/34.0
The referrer thread has an accepted answer.