HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>tag id demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
  </style>
</head>
<body>
  <h2 id="pageTitle">Correct h2 title</h2>
  <div id="pageTitle">Wrong tag — same id (invalid HTML demo)</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("h2#pageTitle").css("color", "#2563eb");
  </script>
</body>
</html>

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h2#pageTitle — tag + id (Try It)