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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>initMouseEvent — basic</title>
</head>
<body>
  <p>Legacy synthetic click (deprecated).</p>
  <pre id="out"></pre>
  <script>
    var event = document.createEvent("MouseEvents");
    event.initMouseEvent(
      "click", true, true, window, 0,
      0, 0, 80, 20,
      false, false, false, false,
      0, null
    );
    document.body.dispatchEvent(event);
    document.getElementById("out").textContent =
      event.type + " " + event.clientX + " " + event.clientY;
  </script>
</body>
</html>

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MouseEvent.initMouseEvent — basic (Try It)