HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Heading Hierarchy Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:1.5rem;color:#334155;line-height:1.5}h1{font-size:1.75rem;color:#0f172a}h2{font-size:1.375rem;color:#0f172a}h3{font-size:1.125rem}h4{font-size:1rem}h5{font-size:.875rem}h6{font-size:.8125rem;color:#475569}</style>

</head>

<body>

  <main>

    <h1>Main Heading</h1>

    <p>Intro paragraph for the page topic.</p>

    <h2>Subheading</h2>

    <p>Content under the first subsection.</p>

    <h3>Heading 3</h3>

    <h4>Heading 4</h4>

    <h5>Heading 5</h5>

    <h6>Least Significant Heading</h6>

  </main>

</body>

</html>

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HTML Heading Tags — h1 to h6 Hierarchy