HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onunload — inline 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}#status{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:480px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}.hint{font-size:.875rem;color:#64748b;max-width:480px}</style>

</head>

<body onunload=performUnloadActions()>

  <h1>window / body onunload</h1>

  <p class=hint>Reload or close this tab — onunload saves a timestamp. Reload again to see it below.</p>



  <p id=status aria-live=polite>Loading…</p>



  <script>var KEY="lastUnloadDemo";function performUnloadActions(){try{sessionStorage.setItem(KEY,(new Date).toLocaleTimeString())}catch(t){}}var last=sessionStorage.getItem(KEY),status=document.getElementById("status");last?(status.textContent="Last unload saved at: "+last+" — reload to test again",status.style.background="#f0fdf4",status.style.borderColor="#bbf7d0",status.style.color="#166534"):(status.textContent="No unload recorded yet — reload this page to trigger onunload",status.style.background="#eff6ff",status.style.borderColor="#bfdbfe",status.style.color="#1e40af")</script>

</body>

</html>

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HTML onunload Attribute — inline window handler