<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Dynamic id and style</title>
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#dom-and-javascript"/>
<link rel="match" href="dynamic-2-ref.html"/>
<meta name="assert" content="Verify dynamic change of id and style attributes.">
<style>
  #fail, #fail2 { background: red; color: white; }
  #pass { background: green; color: white; }
</style>
<script>
  window.addEventListener("DOMContentLoaded", function() {
    document.getElementById("fail2").setAttribute("id", "pass");
    document.getElementById("fail").setAttribute("style", "display: none");
  });
</script>
</head>
<body>
  <p>Test passes if you see the text "PASS".</p>
  <math>
    <mtext id="fail">FAIL</mtext>
    <mtext id="fail2">PASS</mtext>
  </math>
</body>
</html>