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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mouseover vs mouseout relatedTarget</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #zone { padding: 24px; background: #fef3c7; border: 2px dashed #f59e0b; border-radius: 8px; max-width: 20rem; }
    #outside { margin-top: 12px; padding: 12px; background: #e0f2fe; border-radius: 6px; }
    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <div id="zone">Hover zone — move in and out</div>
  <div id="outside">Outside area</div>
  <div id="log">Move between zones.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#zone").on("mouseover mouseout", function (event) {
      var rt = event.relatedTarget;
      var dir = event.type === "mouseover" ? "from" : "to";
      var name = rt ? rt.nodeName + (rt.id ? "#" + rt.id : "") : "(outside document)";
      $("#log").text(event.type + " — relatedTarget " + dir + ": " + name);
    });
  </script>
</body>
</html>

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jQuery event.relatedTarget — direction log (Try It)