HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>relatedTarget vs target</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #panel { padding: 16px; background: #f1f5f9; border-radius: 8px; }
    #panel a { color: #2563eb; }
    #outside { margin-top: 12px; padding: 12px; background: #e0f2fe; border-radius: 6px; }
    #log { margin-top: 12px; padding: 12px; background: #fff; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 14px; line-height: 1.6; }
  </style>
</head>
<body>
  <div id="panel">
    Panel with <a href="#">nested link</a>
  </div>
  <div id="outside">Move out to this area</div>
  <div id="log">Mouse out from the link.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#panel").on("mouseout", "a", function (event) {
      var rt = event.relatedTarget;
      $("#log").html(
        "target: " + event.target.nodeName + "<br>" +
        "currentTarget: " + event.currentTarget.nodeName + "<br>" +
        "relatedTarget: " + (rt ? rt.nodeName + (rt.id ? "#" + rt.id : "") : "null")
      );
    });
  </script>
</body>
</html>

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jQuery event.relatedTarget — compare targets (Try It)