<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>background on body should fill the viewport even when it has bogus siblings</title>
<style>
html { background-color:transparent; background-image:none; }
body { background-color:yellow; color:navy; }
</style>
</head>
<body xmlns="urn:foo:bogus"/><body>
<p>The canvas should be yellow.</p>
</body>
</html>