HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>wheel — zoom counter</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}#box{width:200px;height:120px;border:2px solid #6366f1;border-radius:8px;background:#eef2ff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.125rem;color:#3730a3;outline:0;margin-bottom:.75rem;transition:transform .15s ease}#hint{font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Wheel zoom demo</h1>

  <p>Scroll up to zoom in, down to zoom out.</p>

  <div id=box tabindex=0>100%</div>

  <p id=hint>Wheel over the box. Range: 50%–200%.</p>



  <script>var box=document.getElementById("box"),zoom=100;box.addEventListener("wheel",(function(o){o.deltaY<0?zoom+=10:o.deltaY>0&&(zoom-=10),zoom=Math.max(50,Math.min(200,zoom)),box.textContent=zoom+"%",box.style.transform="scale("+zoom/100+")"}))</script>

</body>

</html>

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HTML onmousewheel Attribute — Zoom counter