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<!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 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>