HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>slice migration</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    li { margin: 4px 0; padding: 4px 8px; border: 1px solid #ccc; }
    .hi { background: #bbf; }
  </style>
</head>
<body>
  <ul>
    <li>Item 0</li>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
    <li>Item 4</li>
  </ul>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("li").slice(0, 3).addClass("hi");
  </script>
</body>
</html>

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Migrate :lt(3) to .slice(0, 3) (Try It)