HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>ontoggle — dialog 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}button{padding:.5rem 1rem;border:none;border-radius:8px;background:#2563eb;color:#fff;font-size:.875rem;font-weight:600;cursor:pointer}dialog{border:1px solid #e2e8f0;border-radius:8px;padding:1.25rem;max-width:320px}#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>toggle on &lt;dialog&gt;</h1>

  <p>Open and close the dialog — status tracks the toggle event.</p>



  <button type=button id=openBtn>Open dialog</button>

  <p id=status aria-live=polite>Dialog closed</p>



  <dialog id=demoDialog>

    <p>Hello from the dialog!</p>

    <button type=button id=closeBtn>Close</button>

  </dialog>



  <script>var dialog=document.getElementById("demoDialog"),status=document.getElementById("status");document.getElementById("openBtn").addEventListener("click",(function(){dialog.showModal()})),document.getElementById("closeBtn").addEventListener("click",(function(){dialog.close()})),dialog.addEventListener("toggle",(function(t){var e=t.target.open;status.textContent=e?"Dialog open":"Dialog closed",status.style.background=e?"#f0fdf4":"#f1f5f9",status.style.borderColor=e?"#bbf7d0":"#e2e8f0",status.style.color=e?"#166534":"#475569"}))</script>

</body>

</html>

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HTML ontoggle Attribute — addEventListener on dialog