<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("p").toggleClass("main");
});
});
</script>
<style>
.main {
font-size: 120%;
color: red;
}
</style>
</head>
<body>
<p>This is a paragraph.</p>
<p class="main">This is another paragraph.</p>
<button>Toggle class "main" for p elements</button>
</body>
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_html_toggleclass_2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:33:37 GMT -->
</html>