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<!DOCTYPE html>
<html>
<body>
<ol id="myOl">
  <li>Coffee</li>
  <li>Tea</li>
  <li>Milk</li>
</ol>
<p>Click the button to set the ordered list to use uppercase roman numbers.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.getElementById("myOl").type = "I";
}
</script>
</body>
</html>