<!DOCTYPE html>
<html lang="en-US">
<body>
<p>This is paragraph 1</p>
<p>This is paragraph 2</p>
<p>This is paragraph 1</p>
<button onclick="p1ANDp1()">Compare 1 & 1</button>
<button onclick="p1ANDp2()">Compare 1 & 2</button>
<button onclick="p1ANDp3()">Compare 1 & 3</button>
<script>
var p1 = document.getElementsByTagName("p")[0];
var p2 = document.getElementsByTagName("p")[1];
var p3 = document.getElementsByTagName("p")[2];
function p1ANDp1(){
alert(p1.isEqualNode(p1));
}
function p1ANDp2(){
alert(p1.isEqualNode(p2));
}
function p1ANDp3(){
alert(p1.isEqualNode(p3));
}
</script> </body>
</html>