unique-identifier-1-iframe-1.html

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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>