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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>MouseEvent constructor</title>
</head>
<body>
  <p>Modern replacement for initMouseEvent.</p>
  <pre id="out"></pre>
  <script>
    var event = new MouseEvent("click", {
      bubbles: true,
      cancelable: true,
      view: window,
      clientX: 80,
      clientY: 20
    });
    document.body.dispatchEvent(event);
    document.getElementById("out").textContent =
      event.type + " " + event.clientX + " " + event.clientY;
  </script>
</body>
</html>

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MouseEvent() modern replacement (Try It)