<!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); window.alert(x); } </script> </body> </html>