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<!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>