HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Section Comments</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}header,main{background:#fff;border:1px solid #e2e8f0;border-radius:8px;padding:1rem;margin-bottom:.75rem;max-width:420px}header h2,main h2{margin:0 0 .5rem;font-size:1rem;color:#0f172a}p{margin:0}</style>
</head>
<body>
  <h1>Structure Comments</h1>

  
  <header>
    <h2>Site Header</h2>
    <p>Navigation and branding go here.</p>
  </header>

  
  <main>
    <h2>Main Content</h2>
    <p>Articles and page content go here.</p>
  </main>
</body>
</html>

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Multi-Line Comments for Page Structure