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<!DOCTYPE html> <html> <title>W3.CSS</title> <link type="text/css" rel="stylesheet" href="/lib/w3.css"> <body> <div class="w3-container"> <h1>This is Heading 1</h1> <h2>This is Heading 2</h2> <h3>This is Heading 3</h3> <h4>This is Heading 4</h4> <h5>This is Heading 5</h5> <h6>This is Heading 6</h6> <p>This is a paragraph.</p> </div> </body> </html>