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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/lib/w3.css"> <body> <header class="w3-container w3-teal"> <h1>A Visible Header</h1> </header> <p>There is a hidden footer below me.</p> <footer class="w3-container w3-hide w3-teal"> <h5>A Hidden Footer</h5> </footer> </body> </html>