HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>contextmenu coordinates</title>
  <style>
    #area { height: 160px; border: 1px solid #94a3b8; background: #f8fafc; }
  </style>
</head>
<body>
  <div id="area">Right-click anywhere in this area</div>
  <pre id="out">(waiting)</pre>
  <script>
    var area = document.getElementById("area");
    var out = document.getElementById("out");
    area.addEventListener("contextmenu", function (event) {
      event.preventDefault();
      out.textContent = "x=" + event.clientX + ", y=" + event.clientY;
    });
  </script>
</body>
</html>

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Element contextmenu — clientX / clientY (Try It)