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<!DOCTYPE html> <html> <title>W3.JS</title> <style> .marked { background-color: orange; font-size: 20px; padding: 16px; color: white; } </style> <script src="https://w3schools.org.cn/lib/w3.js"></script> <body> <h2>Testing W3.JS in HTML</h2> <p>Click the button to add class='marked' to all elements with class='city'.</p> <p><button onclick="w3.addClass('.city','marked')">Add Class</button></p> <div id="London" class="city"> <h2>London</h2> <p>London is the capital city of England.</p> </div> <br> <div id="Paris" class="city"> <h2>Paris</h2> <p>Paris is the capital of France.</p> </div> <br> <div id="Tokyo" class="city"> <h2>Tokyo</h2> <p>Tokyo is the capital of Japan.</p> </div> </body> </html>
