HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pageX — log</title>
  <style>
    .box {
      width: 400px;
      height: 250px;
      border: 2px solid darkblue;
      background-color: blue;
      color: white;
      padding: 12px;
      box-sizing: border-box;
      font: 16px sans-serif;
    }
  </style>
</head>
<body>
  <div class="box">
    <p>Move the mouse around in this box to watch its coordinates change.</p>
    <p><code>pageX</code>: <span id="x">n/a</span></p>
    <p><code>pageY</code>: <span id="y">n/a</span></p>
  </div>
  <script>
    var box = document.querySelector(".box");
    var pageXEl = document.getElementById("x");
    var pageYEl = document.getElementById("y");
    function updateDisplay(event) {
      pageXEl.innerText = event.pageX;
      pageYEl.innerText = event.pageY;
    }
    box.addEventListener("mousemove", updateDisplay);
    box.addEventListener("mouseenter", updateDisplay);
    box.addEventListener("mouseleave", updateDisplay);
  </script>
</body>
</html>

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MouseEvent.pageX — MDN log (Try It)