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<!DOCTYPE html>
<html>
<title>W3.JS</title>
<style>
.marked {
    background: orange;
    font-size: 30px;
    color: white;
}
</style>
<script src="../lib/w3.js"></script>
<body>
​
<p>Click the button to add the "marked" class to id="London".</p>
​
<button onclick="w3.addClass('#London','marked')">Add Class</button>
​
<div id="London" class="city">
  <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>
​
</body>
​
<!-- Mirrored from www.w3schools.com/w3js/tryit.asp?filename=tryw3js_ref_add_class by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:23:17 GMT -->
</html>
​
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