bug: didn't close the head and it still validates

I used http://validator.w3.org/check to validate (simplified):


___________________________

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-us">

	<head>
		<meta charset="UTF-8" />
		<title>test</title>
	
	<body>
		bla
	</body>
</html>

____________________________


As you can see there's no </head> but still it validates:

This document was successfully checked as HTML5!
Result: 	Passed, 1 warning(s) (Using experimental feature: HTML5 Conformance Checker.)

Received on Wednesday, 10 March 2010 09:23:35 UTC