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  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Comment Rules</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}.rules{margin:0;padding-left:1.25rem;max-width:480px}.rules li{margin-bottom:.5rem}.warn{margin-top:1rem;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#92400e;max-width:480px}code{font-family:Consolas,monospace;background:#f1f5f9;padding:.1rem .35rem;border-radius:4px;font-size:.9em}</style>
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<body>
  <h1>Comment Rules</h1>

  <ul class=rules>
    <li>Syntax: <code>&lt;!-- your note --&gt;</code></li>
    <li>There is <strong>no</strong> <code>&lt;comment&gt;</code> HTML element</li>
    <li>Do not nest comments inside comments</li>
    <li>Anyone can read comments in View Source</li>
  </ul>

  

  <p class=warn>Never store passwords, API keys, or private data in HTML comments.</p>
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Comment Rules and Common Mistakes