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<!DOCTYPE html> <html> <title>W3.JS</title> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <script src="https://www.w3schools.com/lib/w3.js"></script> <body class="w3-container"> <h2>Testing W3.JS with CSS</h2> <p>Click to toggle between class "w3-red" and "w3-green" of id="London".</p> <p> <button class="w3-btn w3-red" onclick="w3.toggleClass('#London','w3-red','w3-green')">Toggle Class</button> </p> <div id="London" class="w3-panel w3-red city"> <h2>London</h2> <p>London is the capital city of England.</p> </div> <div id="Paris" class="w3-panel w3-red city"> <h2>Paris</h2> <p>Paris is the capital of France.</p> </div> <div id="Tokyo" class="w3-panel w3-red city"> <h2>Tokyo</h2> <p>Tokyo is the capital of Japan.</p> </div> </body> </html>
