HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .first() highlight</title>
  <style>
    .highlight { background-color: yellow; }
  </style>
</head>
<body>
  <p>Look:</p>
  <ul>
    <li>This is some text in a list.</li>
    <li>This is a note about it.</li>
    <li>This is another note about it.</li>
  </ul>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("ul li").first().addClass("highlight");
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery ul li .first() highlight (Try It)