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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<head>
<style>
.mystyle {
  width: 500px;
  height: 50px;
  border: 1px solid black;
}
​
.anotherClass {
  background-color: lightblue;
  padding: 25px;
}
​
.thirdClass {
  text-align: center;
  font-size: 25px;
  color: navy;
  margin-bottom: 10px;
}
</style>
</head>
<body>
​
<p>Click the button to find out if the DIV element has a class of "mystyle". If so, remove "anotherClass".</p>
​
<div id="myDIV" class="mystyle anotherClass thirdClass">
I am a DIV element
</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>
​
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
​
  if (x.classList.contains("mystyle")) {
    x.classList.remove("anotherClass");
  } else {
    alert("Could not find it.");
  }
}
</script>
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