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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="https://www.w3schools.com/w3css/4/w3.css"> <body> <div class="w3-container"> <h2>Animated Tooltips</h2> <p>Hover over the sentence below!</p> <p class="w3-tooltip">London <span class="w3-text w3-tag w3-animate-opacity">9 million inhabitants</span> is the capital of England.</p> </div> </body> </html>
