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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>relatedTarget — synthetic</title>
</head>
<body>
  <div id="a">A</div>
  <div id="b">B</div>
  <pre id="out"></pre>
  <script>
    var from = document.getElementById("a");
    var to = document.getElementById("b");
    var event = new MouseEvent("mouseover", {
      bubbles: true,
      relatedTarget: from
    });
    to.dispatchEvent(event);
    document.getElementById("out").textContent = [
      event.relatedTarget === from,
      event.target === to
    ].join("\n");
  </script>
</body>
</html>

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MouseEvent.relatedTarget — synthetic (Try It)