<!DOCTYPE html>
<html>
<body>
<ul class="example">
<li class="child">Coffee</li>
<li class="child">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>
<p><strong>Note:</strong> The getElementsByClassName() method is not supported in Internet Explorer 8 and earlier versions.</p>
<script>
function myFunction() {
var list = document.getElementsByClassName("example")[0];
list.getElementsByClassName("child")[0].innerHTML = "Milk";
}
</script>
</body>
</html>