IS Methods

<!DOCTYPE html>
<html>
<body>

<p>Click the button to check if the ul element with id="myList" is the same as the document's first ul element.</p>

<button onclick="myFunction()">Try it</button>

<ul id="myList"><li>Coffee</li><li>Tea</li></ul>

<p><strong>Note:</strong> Firefox stopped supported this method as of version 10, Instead, use === to compare if two nodes are the same.</p>

<p><strong>Note:</strong> Internet Explorer 8 and earlier does not support the isSameNode() method.</p>

<p id="demo"></p>

<script>
function myFunction() {
  var item1 = document.getElementById("myList");
  var item2 = document.getElementsByTagName("UL")[0];
  var x = item1.isSameNode(item2);
  document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>