HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onload — addEventListener</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}#app.loading{opacity:.5}#log{margin-top:.75rem;padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}</style>

</head>

<body>

  <div id=app class=loading>

    <h1>Dynamic onload</h1>

    <p>Handler registered with addEventListener — not inline on body.</p>

  </div>

  <div id=log>Waiting for load event…</div>



  <script>window.addEventListener("load",(function(){document.getElementById("app").classList.remove("loading"),document.getElementById("log").textContent="load event fired — page ready!"}))</script>

</body>

</html>

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HTML onload Attribute — addEventListener