HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onunload — save draft</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}textarea{width:100%;max-width:420px;min-height:80px;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.875rem;box-sizing:border-box;margin-bottom:.75rem}#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>

  <h1>Save draft on unload</h1>

  <p class=hint>Type a note, then reload — onunload saves it to localStorage. Reload to see it restored.</p>



  <label for=note>Draft note</label>

  <textarea id=note placeholder="Type something…"></textarea>

  <p id=status aria-live=polite>Ready</p>



  <script>var DRAFT_KEY="unloadDraftDemo",note=document.getElementById("note"),status=document.getElementById("status"),saved=localStorage.getItem(DRAFT_KEY);saved&&(note.value=saved,status.textContent="Draft restored from last visit",status.style.background="#f0fdf4",status.style.borderColor="#bbf7d0",status.style.color="#166534"),window.addEventListener("unload",(function(){try{localStorage.setItem(DRAFT_KEY,note.value)}catch(t){}}))</script>

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HTML onunload Attribute — addEventListener with draft save