HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Scoped contains demo</title>

  <style>

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

    ul { list-style: none; padding: 0; }

    li { padding: 6px 0; }

  </style>

</head>

<body>

  <ul id="fruits">

    <li>apple</li>

    <li>banana</li>

    <li>grape</li>

    <li>orange</li>

  </ul>

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

  <script>

    $("#fruits li:contains('ap')").css("font-weight", "bold");

  </script>

</body>

</html>

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Scoped #fruits li:contains('ap') (Try It)