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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(){
  $("button").click(function(){
    $("p:last").removeClass("intro").addClass("main");
  });
});
</script>
<style>
.intro {
  color: red;
}
.main {
  background-color: yellow;
}
</style>
</head>
<body>
​
<h1>This is a heading</h1>
​
<p>This is another paragraph.</p>
<p class="intro">This is a paragraph.</p>
​
<button>Change class name of the last p element</button>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_html_addremoveclass by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:33:27 GMT -->
</html>
​
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