<!DOCTYPE html>
<html>
<title>W3.JS</title>
<style>
.class1 {
    background-color: orange;
    font-size: 30px;
    color: white;
}

.class2 {
    padding: 20px;
    border: 5px solid red;
}
</style>
<script src="/lib/w3.js"></script>
<body>

<p>Click the button to remove the class names "class1" and "class2" from id="London".</p>

<button onclick="w3.removeClass('#London','class1 class2')">Remove Classes</button>

<div id="London" class="city class1 class2">
  <h2>London</h2>
  <p>London is the capital city of England.</p>
</div>

<div id="Paris" class="city">
  <h2>Paris</h2>
  <p>Paris is the capital of France.</p> 
</div>

<div id="Tokyo" class="city">
  <h2>Tokyo</h2>
  <p>Tokyo is the capital of Japan.</p>
</div>

</body>
</html>

Click the button to remove the class names "class1" and "class2" from id="London".

London

London is the capital city of England.

Paris

Paris is the capital of France.

Tokyo

Tokyo is the capital of Japan.