HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>details open Attribute</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 1rem;font-size:1.25rem;color:#0f172a}details{max-width:420px;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}summary{cursor:pointer;font-weight:600;color:#1e40af}.note{margin-top:.75rem;font-size:.875rem;color:#64748b}</style>
</head>
<body>
  <h1>open on details</h1>
  <details open>
    <summary>Shipping information</summary>
    <p>Orders ship within 2 business days. Free shipping on orders over $50.</p>
  </details>
  <p class=note>This panel starts open because of the <code>open</code> attribute.</p>
</body>
</html>

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details with open Attribute