HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>ontoggle — details element</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}details{max-width:420px;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}summary{font-weight:600;cursor:pointer}#status{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>ontoggle on &lt;details&gt;</h1>

  <p>Click the summary to expand or collapse — status updates via the toggle event.</p>



  <details ontoggle=toggleAction()>

    <summary>FAQ section</summary>

    <p>This content appears when the details element is open.</p>

  </details>

  <p id=status aria-live=polite>Collapsed — click summary to expand</p>



  <script>function toggleAction(){var e=document.querySelector("details"),t=document.getElementById("status");e.open?(t.textContent="Expanded — details are open",t.style.background="#f0fdf4",t.style.borderColor="#bbf7d0",t.style.color="#166534"):(t.textContent="Collapsed — details are closed",t.style.background="#f1f5f9",t.style.borderColor="#e2e8f0",t.style.color="#475569")}</script>

</body>

</html>

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HTML ontoggle Attribute — inline handler on details