HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeToggle official demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    button { margin: 4px 8px 12px 0; padding: 8px 16px; }
    #log { margin-top: 12px; color: #64748b; min-height: 1.5rem; }
  </style>
</head>
<body>
  <button type="button" id="btn1">fadeToggle p1</button>
  <button type="button" id="btn2">fadeToggle p2</button>
  <p>This paragraph has a slow, linear fade.</p>
  <p>This paragraph has a fast animation.</p>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#btn1").on("click", function () {
      $("p").first().fadeToggle("slow", "linear");
    });
    $("#btn2").on("click", function () {
      $("p").last().fadeToggle("fast", function () {
        $("#log").append(" finished ");
      });
    });
  </script>
</body>
</html>

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jQuery .fadeToggle() — official two-button demo (Try It)