HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onwheel — deltaY</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}#wheelBox{width:260px;height:100px;border:2px solid #6366f1;border-radius:8px;background:#eef2ff;padding:.75rem;overflow:auto;font-size:.8125rem;color:#3730a3;outline:0;margin-bottom:.75rem}#output{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>onwheel (standard replacement for onmousewheel)</h1>

  <p>Scroll the wheel over the blue box.</p>

  <div id=wheelBox onwheel=handleWheel(event) tabindex=0>

    <p style="margin:0 0 .5rem">Wheel over this area.</p>

    <p style=margin:0>Extra content line 1</p>

    <p style="margin:.25rem 0 0">Extra content line 2</p>

    <p style="margin:.25rem 0 0">Extra content line 3</p>

  </div>

  <p id=output>deltaY: waiting…</p>



  <script>function handleWheel(e){var t=e.deltaY>0?"down":e.deltaY<0?"up":"none";document.getElementById("output").textContent="deltaY: "+e.deltaY+" (scroll "+t+")"}</script>

</body>

</html>

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HTML onmousewheel Attribute — onwheel handler