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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"> <style> h1{font-size:64px;} h2{font-size:48px;} h3{font-size:36px;} h4{font-size:24px;} h5{font-size:20px;} h6{font-size:18px;} </style> <body class="w3-container"> <h1>Heading 1</h1> <h2>Heading 2</h2> <h3>Heading 3</h3> <h4>Heading 4</h4> <h5>Heading 5</h5> <h6>Heading 6</h6> </body> </html>