<html><head>
<style>
BODY { display:table; }
</style>
</head>
<body>
<div><iframe src="data:text/html;charset=utf-8,%3Chtml%3E%3Chead%3E%3C/head%3E%3Cbody%3E%3C/body%3E%3C/html%3E"></iframe>
</div>
</body></html>