HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>div > span demo</title>

  <style>

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

    #content { border: 1px solid #ccc; padding: 12px; }

    #inner { margin-top: 8px; padding: 8px; background: #f8fafc; }

  </style>

</head>

<body>

  <div id="content">

    <span>Direct span</span>

    <div id="inner">

      <span>Nested span</span>

    </div>

  </div>

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

  <script>

    $("#content > span").css("font-weight", "bold");

  </script>

</body>

</html>

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div > span direct children only (Try It)