HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onmousemove — inline</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}#mouseDiv{width:280px;height:100px;border:2px solid #6366f1;border-radius:8px;background:#eef2ff;display:flex;align-items:center;justify-content:center;font-size:.8125rem;color:#3730a3;cursor:crosshair;user-select:none;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>mousemove coordinates</h1>

  <p>Move the mouse inside the box.</p>

  <div id=mouseDiv onmousemove=trackMouse(event)>

    Move the mouse over this box.

  </div>

  <p id=output>Mouse coordinates: waiting…</p>



  <script>function trackMouse(t){document.getElementById("output").textContent="Mouse coordinates: X = "+t.clientX+", Y = "+t.clientY}</script>

</body>

</html>

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HTML onmousemove Attribute — Inline handler