HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeToggle vs manual</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
    .box { padding: 14px; margin: 8px 0; border-radius: 8px; }
    #manual { background: #fef3c7; border: 2px solid #d97706; }
    #toggle { background: #dbeafe; border: 2px solid #2563eb; }
    button { margin: 4px 8px 4px 0; padding: 8px 12px; font-size: 13px; }
  </style>
</head>
<body>
  <div class="box" id="manual">Manual: visible ? fadeOut() : fadeIn()</div>
  <button type="button" id="runManual">Toggle manual box</button>
  <div class="box" id="toggle">Single .fadeToggle() call</div>
  <button type="button" id="runToggle">Toggle fadeToggle box</button>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#runManual").on("click", function () {
      var $el = $("#manual");
      if ($el.is(":visible")) { $el.fadeOut(400); } else { $el.fadeIn(400); }
    });
    $("#runToggle").on("click", function () {
      $("#toggle").fadeToggle(400);
    });
  </script>
</body>
</html>

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jQuery .fadeToggle() — vs manual branch (Try It)