HTML Code

<!DOCTYPE html>



<html lang="en">



<head>



  <meta charset="utf-8">



  <title>scoped li:first</title>



  <style>



    body { font-family: sans-serif; padding: 16px; }



    ul { list-style: none; padding: 0; margin: 0 0 12px; display: flex; gap: 12px; }



    li { padding: 6px 12px; border: 1px solid #e2e8f0; border-radius: 6px; }



  </style>



</head>



<body>



  <ul class="nav">



    <li>Home</li>



    <li>About</li>



    <li>Contact</li>



  </ul>



  <ul class="nav">



    <li>Dashboard</li>



    <li>Settings</li>



  </ul>



  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>



  <script>



    $("ul.nav li:first").css({



      fontWeight: "bold",



      color: "#2563eb"



    });



  </script>



</body>



</html>

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ul.nav li:first — scoped query (Try It)