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<!DOCTYPE html>
<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("#add").click(function(){
    $("p").toggleClass("main",true);
  });
  $("#remove").click(function(){
    $("p").toggleClass("main",false);
  });
});
</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 id="add">Add class "main"</button>
<button id="remove">Remove class "main"</button>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_html_toggleclass_switch by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:33:38 GMT -->
</html>
​
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