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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 class="w3-container"> <p>Hover over the sentence below!</p> <p class="w3-tooltip">London <span class="w3-text"><b>9 million</b></span> is the capital city of England.</p> </body> </html>