<html>
<body>
<ul><li>Coffee</li><li>Tea</li></ul>
<p id="demo">Click the button to change the text of a list item.</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>