<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
.one{
color:red;
}
.two{
font-size:20px;
}
</style>
</head>
<body>
<p class="two">Click on the button to check whether this paragraph contains "one" class.</p>
<button onclick="myFunction()">Click Me</button>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var elem = document.getElementsByTagName("p")[0];
function myFunction(){
// try to replace "one" with "two"
x.innerHTML = elem.classList.contains("one");
}
</script> </body>
</html>