HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onwheel — dynamic 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}#dynamicElement{width:280px;height:100px;border:2px solid #334155;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:600;color:#0f172a;background:#f1f5f9;outline:0;margin-bottom:.75rem}#log{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>element.onwheel</h1>

  <p>Scroll the mouse wheel over the box below.</p>

  <div id=dynamicElement tabindex=0>Scroll wheel here</div>

  <div id=log aria-live=polite>Waiting for wheel event…</div>



  <script>var log=document.getElementById("log");document.getElementById("dynamicElement").onwheel=function(e){log.textContent="Wheel detected — deltaY: "+e.deltaY,log.style.background="#eff6ff",log.style.borderColor="#bfdbfe",log.style.color="#1e40af"}</script>

</body>

</html>

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HTML onwheel Attribute — dynamic assignment