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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<title>W3.JS</title>
<link rel="stylesheet" href="../w3css/4/w3.css">
<script src="../lib/w3.js"></script>
<body class="w3-container">
​
<h2>Testing W3.JS with CSS</h2>
​
<p>Click the button to add class='w3-red' to id='London'.</p>
​
<p><button class="w3-btn w3-green" onclick="w3.addClass('#London','w3-red')">Add Class</button></p>
​
<div id="London" class="w3-panel w3-border city">
  <h2>London</h2>
  <p>London is the capital city of England.</p>
</div>
​
<div id="Paris" class="w3-panel w3-border city">
  <h2>Paris</h2>
  <p>Paris is the capital of France.</p> 
</div>
​
<div id="Tokyo" class="w3-panel w3-border city">
  <h2>Tokyo</h2>
  <p>Tokyo is the capital of Japan.</p>
</div>
​
</body>
​
</html>
​
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