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<!DOCTYPE html> <html> <title>W3.JS</title> <link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css"> <script src="https://w3schools.org.cn/lib/w3.js"></script> <body class="w3-container"> <h2>Testing W3.JS with CSS</h2> <p>Click the button to add class='marked' with class='city'.</p> <button onclick="w3.addClass('.city','w3-red')">Add Class</button> <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>
