HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeIn basic</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #book { display: none; padding: 16px; background: #fef3c7; border: 2px solid #d97706; border-radius: 8px; margin-top: 12px; }
    #clickme { color: #2563eb; cursor: pointer; text-decoration: underline; }
  </style>
</head>
<body>
  <span id="clickme">Click here</span>
  <div id="book">The book fades in slowly when you click.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#clickme").on("click", function () {
      $("#book").fadeIn("slow", function () {
        console.log("Animation complete");
      });
    });
  </script>
</body>
</html>

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jQuery .fadeIn() — basic slow reveal (Try It)