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<!DOCTYPE html>
<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("#div1").addClass("important blue");
  });
});
</script>
<style>
.important {
  font-weight: bold;
  font-size: xx-large;
}
​
.blue {
  color: blue;
}
</style>
</head>
<body>
​
<div id="div1">This is some text.</div>
<div id="div2">This is some text.</div>
<br>
​
<button>Add classes to first div element</button>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_dom_addclass2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:28:36 GMT -->
</html>
​
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