HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>odd vs even</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    li { margin: 4px 0; padding: 4px 8px; }
    #output { margin-top: 12px; padding: 12px; background: #e0f2fe; border: 1px solid #0284c7; }
  </style>
</head>
<body>
  <ul id="list">
    <li>Item 0</li>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
    <li>Item 4</li>
  </ul>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#list li:odd").css("backgroundColor", "#bbbbff");
    $("#list li:even").css("color", "#059669");
    $("#output").html(
      ":odd → " + $("#list li:odd").length + " items (indices 1, 3)<br>" +
      ":even → " + $("#list li:even").length + " items (indices 0, 2, 4)"
    );
  </script>
</body>
</html>

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:odd vs :even comparison (Try It)