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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onkeydown — 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}input{display:block;width:100%;max-width:280px;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.875rem;margin-bottom:.75rem}#log{padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}</style>

</head>

<body>

  <h1>dynamicField + addEventListener</h1>

  <p>Handler registered in script — not in HTML markup.</p>

  <input id=dynamicField placeholder="Press keys…">

  <div id=log>Waiting for keydown…</div>



  <script>var field=document.getElementById("dynamicField"),log=document.getElementById("log");field.addEventListener("keydown",(function(e){log.innerHTML="<strong>Key pressed:</strong> "+e.key}))</script>

</body>

</html>

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HTML onkeydown Attribute — addEventListener