HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fadeOut linear vs swing</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .box, button { float: left; margin: 5px 10px 5px 0; }
    .box { height: 80px; width: 80px; background: #090; }
    #log { clear: both; padding-top: 12px; color: #64748b; min-height: 2rem; }
    button { padding: 8px 12px; }
  </style>
</head>
<body>
  <button type="button" id="btn1">fade out</button>
  <button type="button" id="btn2">show</button>
  <div class="box" id="box1" title="linear"></div>
  <div class="box" id="box2" title="swing"></div>
  <div id="log">Left = linear, right = swing (default)</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#btn1").on("click", function () {
      $("#log").empty();
      function complete() {
        $("<div>").text(this.id + " done").appendTo("#log");
      }
      $("#box1").fadeOut(1600, "linear", complete);
      $("#box2").fadeOut(1600, complete);
    });
    $("#btn2").on("click", function () {
      $("div.box").show();
      $("#log").text("Boxes reset.");
    });
  </script>
</body>
</html>

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jQuery .fadeOut() — linear vs swing (Try It)