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<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>details name Accordion</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 .5rem;font-size:1.25rem;color:#0f172a}.note{margin:0 0 1rem;font-size:.875rem;color:#64748b;max-width:460px}.accordion{max-width:480px;display:flex;flex-direction:column;gap:.5rem}details{padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}summary{cursor:pointer;font-weight:600;color:#1e40af}details p{margin:.75rem 0 0;color:#475569}</style>
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<body>
  <h1>Exclusive accordion</h1>
  <p class=note>Panels share <code>name="plan"</code> — opening one closes the others.</p>
  <div class=accordion>
    <details name=plan open>
      <summary>Free plan</summary>
      <p>Basic lessons and community access.</p>
    </details>
    <details name=plan>
      <summary>Pro plan</summary>
      <p>All courses, certificates, and priority support.</p>
    </details>
    <details name=plan>
      <summary>Team plan</summary>
      <p>Pro features for up to 10 members with admin tools.</p>
    </details>
  </div>
</body>
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Accordion Group with name