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<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {
  width: 500px;
  height: 50px;
  border: 1px solid black;
  margin-bottom: 10px;
}
​
.anotherClass {
  background-color: coral;
  text-align: center;
  font-size: 25px;
  color: white;
}
</style>
</head>
<body>
​
<p>Click the button to add an additional class to the div element.</p>
​
<div id="myDIV" class="mystyle">
I am a DIV element
</div>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  document.getElementById("myDIV").className += " anotherClass";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_classname5 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:03:51 GMT -->
</html>
​
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