HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pageY — synthetic</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var event = new MouseEvent("click", {
      pageX: 320,
      pageY: 80,
      bubbles: true
    });
    document.getElementById("out").textContent = [
      event.pageX,
      event.pageY
    ].join("\n");
  </script>
</body>
</html>

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MouseEvent.pageY — synthetic (Try It)