HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Semantic Page Layout</title>
  <style>*{box-sizing:border-box}body{font-family:system-ui,sans-serif;margin:0;padding:1rem;background:#f1f5f9;color:#334155;line-height:1.6;font-size:.9rem}aside,footer,header,nav{padding:.65rem .85rem;border-radius:6px;margin-bottom:.5rem}header{background:#0f172a;color:#f8fafc;font-weight:600}nav{background:#e2e8f0}nav a{color:#2563eb;text-decoration:none;margin-right:.75rem}main{background:#fff;border:2px solid #2563eb;border-radius:8px;padding:1rem;margin-bottom:.5rem}main h1{margin:0 0 .5rem;font-size:1.15rem;color:#0f172a}main p{margin:0}aside{background:#f8fafc;border:1px solid #e2e8f0;font-size:.85rem}footer{background:#e2e8f0;font-size:.8rem;text-align:center}.layout{display:flex;gap:.5rem;flex-wrap:wrap}.layout main{flex:1;min-width:200px}.layout aside{width:140px}</style>
</head>
<body>
  <header>Site Header</header>
  <nav>
    <a href=#>Home</a>
    <a href=#>About</a>
    <a href=#>Contact</a>
  </nav>
  <div class=layout>
    <main>
      <h1>Article Title</h1>
      <p>Primary page content lives inside main — not in header, nav, aside, or footer.</p>
    </main>
    <aside>Related links sidebar</aside>
  </div>
  <footer>&copy; 2026 Example Site</footer>
</body>
</html>

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HTML main Tag — Page Layout Structure