HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>layerX — positioned</title>
  <style>
    #d2 {
      position: absolute;
      top: 80px;
      left: 120px;
      width: 220px;
      border: solid blue 1px;
      padding: 20px;
      background: #f8f8f8;
    }
  </style>
</head>
<body>
  <p>Click inside the absolute box (near its top-left).</p>
  <div id="d2">Positioned div — click me</div>
  <pre id="out" style="margin-top:160px">Waiting…</pre>
  <script>
    document.getElementById("d2").addEventListener("mousedown", function (e) {
      document.getElementById("out").textContent = JSON.stringify({
        layerX: e.layerX,
        pageX: e.pageX,
        offsetX: e.offsetX
      }, null, 2);
    });
  </script>
</body>
</html>

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MouseEvent.layerX — positioned element (Try It)