File: dynamic-1.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Dynamic MathML DOM</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript"/>
<link rel="match" href="dynamic-1-ref.html"/>
<meta name="assert" content="Verify that the MathML DOM tree can be modified via javascript and that the rendering is correctly updated.">
<style>
  mtext.fail { background: red; color: white; }
  mtext.pass { background: green; color: white; }
</style>
<script>
  window.addEventListener("DOMContentLoaded", function() {
    var kMathMLNamespace = "http://www.w3.org/1998/Math/MathML";
    var mtext = document.createElementNS(kMathMLNamespace, "mtext");
    mtext.setAttribute("class", "pass");
    mtext.textContent = "PASS";
    var math = document.getElementsByTagNameNS(kMathMLNamespace, "math")[0];
    math.replaceChild(mtext, math.firstElementChild);
  });
</script>
</head>
<body>
  <p>Test passes if you see the text "PASS".</p>
  <math>
    <mtext class="fail">FAIL</mtext>
  </math>
</body>
</html>