Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<ul>
  <li>Coffee</li>
  <li>Tea</li>
</ul>

<p>Click the button to change the text of the first list item (index 0).</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var list = document.getElementsByTagName("UL")[0];
    list.getElementsByTagName("LI")[0].innerHTML = "Milk";
}
</script>

</body>
</html>