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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Unique Identifier (iframe)</title>
</head>
<body>
<div style="width: 100px; height: 500px;">
<math><mtext style="background: red; color: white;">FAIL</mtext></math>
</div>
<div style="width: 100px; height: 500px;">
<math><mtext style="background: green; color: white;"
id="PASS">PASS</mtext></math>
</div>
</body>
</html>