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<!DOCTYPE html>
<html>
<body>
<h1>Change list-style with JavaScript</h1>
<p>Click the "Try it" button to change the style of the list:</p>
<button onclick="myFunction()">Try it</button>
<ul id="myUL">
  <li>Emil</li>
  <li>Tobias</li>
  <li>Linus</li>
</ul>
<script>
function myFunction() {
  document.getElementById("myUL").style.listStyle = "decimal inside";
}
</script>
</body>
</html>