<html>
<body>
<button onclick="myFunction()">Try it</button>
<p id="demo">Click the button to check the feature Core XML DOM Level 2 is supported for the button element.</p>
<script>
function myFunction()
{
var item=document.getElementsByTagName("BUTTON")[0];
var x=document.getElementById("demo");
x.innerHTML=item.isSupported("Core","2.0");
}
</script>
<p><strong>Note:</strong> Internet Explorer 8 and earlier does not support the isSupported method.</p>
</body>
</html>