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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .addBack() vs .end()</title>
</head>
<body>
  <ul>
    <li>1</li>
    <li>2</li>
    <li class="third-item">3</li>
    <li>4</li>
    <li>5</li>
  </ul>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var addBackLen = $("li.third-item").nextAll().addBack().length;
    var endLen = $("li.third-item").nextAll().end().length;
    document.getElementById("out").textContent =
      "addBack().length = " + addBackLen + "\nend().length = " + endLen;
  </script>
</body>
</html>

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jQuery .addBack() vs .end() (Try It)