HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>offsetY — log</title>
  <style>
    #box {
      width: 260px;
      height: 140px;
      border: 2px solid #333;
      padding: 12px;
      background: #f8fafc;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="box">Click inside this box</div>
  <p id="log">offsetX: —, offsetY: —</p>
  <script>
    var box = document.querySelector("#box");
    var log = document.querySelector("#log");
    box.addEventListener("click", function (e) {
      log.textContent = "offsetX: " + e.offsetX + ", offsetY: " + e.offsetY;
    });
  </script>
</body>
</html>

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MouseEvent.offsetY — box log (Try It)