<!DOCTYPE html>
<html>
<body>
<p>Click the "Try it" button to add a red shadow to the H1 element:</p>
<button onclick="myFunction()">Try it</button>
<h1 id="myH1">This is my header</h1>
<script>
function myFunction() {
document.getElementById("myH1").style.textShadow = "2px 5px 5px red";
}
</script>
<p><b>Note:</b> Internet Explorer 9 and earlier do not support the textShadow property.</p>
</body>
</html>