HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>size — list count</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    ul { background: #eef2ff; padding: 12px 12px 12px 32px; border-radius: 8px; }
    #out { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 8px; white-space: pre-wrap; }
    .note { color: #64748b; font-size: 13px; margin-top: 8px; }
  </style>
</head>
<body>
  <ul>
    <li>foo</li>
    <li>bar</li>
  </ul>
  <div id="out"></div>
  <p class="note">Loaded with jQuery 1.12.4 so .size() still exists.</p>
  <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  <script>
    var sizeVal = $( "li" ).size();
    var lengthVal = $( "li" ).length;
    $( "#out" ).text(
      "Size: " + sizeVal + "\n" +
      "Size: " + lengthVal + "\n\n" +
      "Both APIs match: " + (sizeVal === lengthVal)
    );
  </script>
</body>
</html>

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jQuery .size() — count list items (Try It)