HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>offsetX — dot</title>
  <style>
    #area {
      position: relative;
      width: 280px;
      height: 160px;
      border: 2px dashed #64748b;
      background: #f8fafc;
      cursor: crosshair;
    }
    #dot {
      position: absolute;
      width: 12px;
      height: 12px;
      margin: -6px 0 0 -6px;
      border-radius: 50%;
      background: #e11d48;
      left: 0;
      top: 0;
      pointer-events: none;
    }
  </style>
</head>
<body>
  <div id="area"><div id="dot"></div></div>
  <p>Click inside the area to move the dot.</p>
  <script>
    var area = document.querySelector("#area");
    var dot = document.querySelector("#dot");
    area.addEventListener("click", function (e) {
      dot.style.left = e.offsetX + "px";
      dot.style.top = e.offsetY + "px";
    });
  </script>
</body>
</html>

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MouseEvent.offsetX — place a dot (Try It)