HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mouseout relatedTarget</title>
  <style>
    #stage { display: flex; gap: 12px; padding: 16px; border: 2px solid #333; }
    #a, #b { padding: 24px; background: #fff3e0; }
  </style>
</head>
<body>
  <div id="stage">
    <div id="a">A</div>
    <div id="b">B</div>
  </div>
  <pre id="out">(waiting)</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    stage.addEventListener("mouseout", function (event) {
      var from = event.target.id || event.target.tagName.toLowerCase();
      var to =
        (event.relatedTarget && (event.relatedTarget.id || event.relatedTarget.tagName.toLowerCase())) ||
        "outside";
      out.textContent = from + " → " + to;
    });
  </script>
</body>
</html>

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Element mouseout — relatedTarget (Try It)