<!DOCTYPE html>
<html>
<body>
<p>Click the button to check the feature Core XML DOM Level 2 is supported for the button element.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> This method is not supported in Chrome, Firefox, Opera and IE8 and earlier versions.</p>
<p id="demo"></p>
<script>
function myFunction() {
var item = document.getElementsByTagName("BUTTON")[0];
var x = item.isSupported("Core", "2.0");
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>