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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.unique() — identity</title>
</head>
<body>
  <div id="panel">Target panel</div>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var target = document.getElementById("panel");
      var nodes = [target, target, target];
      var before = nodes.length;
      $.unique(nodes);
      document.getElementById("out").textContent =
        "Before: " + before + "\nAfter: " + nodes.length + "\nSame ref: " + (nodes[0] === target);
    })();
  </script>
</body>
</html>

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jQuery.unique() — duplicate references (Try It)