HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>ontoggle — dynamic handler</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}#log{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>dynamicToggle.ontoggle</h1>

  <p>Handler attached in script — expand or collapse to see the log.</p>



  <details id=dynamicToggle>

    <summary>Click to expand</summary>

    <p>Extra content inside the details element.</p>

  </details>

  <div id=log aria-live=polite>Waiting for toggle…</div>



  <script>document.getElementById("dynamicToggle").ontoggle=function(){var e=document.getElementById("dynamicToggle"),o=document.getElementById("log");o.textContent=e.open?"Toggled dynamically — now open":"Toggled dynamically — now closed",o.style.background=e.open?"#f0fdf4":"#f1f5f9",o.style.borderColor=e.open?"#bbf7d0":"#e2e8f0",o.style.color=e.open?"#166534":"#475569"}</script>

</body>

</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

HTML ontoggle Attribute — dynamic handler