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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> <h1>Heading 1 (36px)</h1> <h2>Heading 2 (30px)</h2> <h3>Heading 3 (24px)</h3> <h4>Heading 4 (20px)</h4> <h5>Heading 5 (18px)</h5> <h6>Heading 6 (16px)</h6> </body> </html>