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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=us-ascii">
</head>
<body>
<iframe width="400" height="400" src="data:application/xhtml+xml;charset=us-ascii,<html xmlns='http://www.w3.org/1999/xhtml'><h1>Test</h1></html>"></iframe>
</body>
</html>