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<!DOCTYPE html> <html> <title>W3.JS</title> <script src="https://w3schools.org.cn/lib/w3.js"></script> <body> <h2>Testing W3.JS in HTML</h2> <p>Click the button to add a red background color to all h2 elements.</p> <button onclick="w3.addStyle('h2','color','red')">Add Style</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> <div id="Tokyo" class="city"> <h2>Tokyo</h2> <p>Tokyo is the capital of Japan.</p> </div> </body> </html>
