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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lt 1 vs first</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    li { margin: 4px 0; padding: 4px 8px; border: 1px solid #ccc; }
    #output { margin-top: 12px; padding: 12px; background: #e0f2fe; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <ul><li>Alpha</li><li>Beta</li><li>Gamma</li></ul>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":lt(1) → " + $("li:lt(1)").text() + "\n:first → " + $("li:first").text() + "\nSame? " + $("li:lt(1)").is($("li:first")[0])
    );
  </script>
</body>
</html>

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:lt(1) equals :first (Try It)