HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onmousemove — offsetX/Y</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}#zone{position:relative;width:280px;height:160px;border:2px dashed #94a3b8;border-radius:8px;background:#f1f5f9;cursor:crosshair;overflow:hidden;margin-bottom:.75rem}#dot{position:absolute;width:12px;height:12px;margin:-6px 0 0 -6px;background:#ef4444;border-radius:50%;pointer-events:none}#label{font-size:.875rem;padding:.75rem 1rem;background:#fef3c7;border:1px solid #fde68a;border-radius:8px;max-width:420px}</style>

</head>

<body>

  <h1>Local offsetX / offsetY</h1>

  <p>Dot follows the pointer relative to the zone top-left.</p>

  <div id=zone>

    <div id=dot></div>

  </div>

  <div id=label>Local: move inside the zone</div>



  <script>var zone=document.getElementById("zone"),dot=document.getElementById("dot"),label=document.getElementById("label");zone.addEventListener("mousemove",(function(e){dot.style.left=e.offsetX+"px",dot.style.top=e.offsetY+"px",label.textContent="Local: "+e.offsetX+", "+e.offsetY}))</script>

</body>

</html>

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HTML onmousemove Attribute — Local coordinates