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The following code will validate as HTML5: <!doctype html> <html> <title>Test</title> </head> <body> </body> </html> The head tag is missing its open tag but still has the close tag.
The text/html syntax of the HTML language has always permitted the head start tag to be omitted; see: http://dev.w3.org/html5/markup/head.html#head-tags In a conforming HTML5 parser, the head start tag is implied by the start tag for the title element, meaning that the parser essentially injects the head start tag into the DOM when it fines the title start tage