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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {
  width: 500px;
  height: 50px;
}
.anotherClass {
  background-color: lightblue;
}
.thirdClass {
  text-align: center;
  font-size: 25px;
  color: black;
  margin-bottom: 10px;
}
</style>
</head>
<body>
<p>Click the button to display the class names of the div element.</p>
<div id="myDIV" class="mystyle anotherClass thirdClass">
I am a DIV element with multiple classes
</div>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> The classList property is not supported in Internet Explorer 9 and earlier versions.</p>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myDIV").classList;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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