HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeToggle panel</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #panel {
      display: none;
      padding: 16px;
      background: #e0f2fe;
      border: 2px solid #0284c7;
      border-radius: 8px;
      margin-top: 12px;
    }
    button { padding: 8px 16px; }
  </style>
</head>
<body>
  <button type="button" id="toggle">Toggle panel</button>
  <div id="panel">Extra details fade in and out on each click.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#toggle").on("click", function () {
      $("#panel").fadeToggle();
    });
  </script>
</body>
</html>

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jQuery .fadeToggle() — panel toggle (Try It)