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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://www.w3schools.com/w3css/5/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>