0319-novalid.html
<!DOCTYPE html>
<html>
<head>
<base href="http://example.com/"/>
<meta charset=utf-8>
<title>Test 0319</title>
</head>
<body prefix="pr: relative/iri#" xmlns:xpr="relative/uri#">
<p property="pr:prop xpr:prop">value</p>
</body>
</html>