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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> <div class="w3-container"> <p><button class="w3-btn w3-green" onclick="w3.hide('p')">Hide all p elements</button></p> <div class="w3-panel w3-green"> <h2>London</h2> <p>London is the capital city of England.</p> <p>It is the most populous city in the United Kingdom.</p> <p>Population over 13 million inhabitants.</p> </div> </div> </body> </html>
