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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> <div class="w3-container w3-center w3-animate-fading"> <h2>Animation fade in AND out</h2> <h5>The w3-animate-fading class fades in and out an element repeatedly.</h5> <p>It animates an element's opacity from 0 to 1 and 1 to 0 in 10 seconds.</p> </div> </body> </html>