<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Dynamic id and style (reference)</title>
<style>
  #pass { background: green; color: white; }
</style>
</head>
<body>
  <p>Test passes if you see the text "PASS".</p>
  <math>
    <mtext id="pass">PASS</mtext>
  </math>
</body>
</html>