HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>finish fx after fadeToggle</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #panel {
      padding: 16px;
      background: #fef3c7;
      border: 2px solid #d97706;
      border-radius: 8px;
      margin-top: 12px;
    }
    button { margin: 4px 8px 0 0; padding: 8px 12px; }
    #status { margin-top: 12px; color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="spam">Spam fadeToggle</button>
  <button type="button" id="finish">finish('fx')</button>
  <div id="panel">Panel snaps to final opacity when you finish the fx queue.</div>
  <p id="status">Spam click builds a queue; finish('fx') completes all pending fades.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#spam").on("click", function () {
      $("#panel").fadeToggle(600);
    });
    $("#finish").on("click", function () {
      $("#panel").finish("fx");
      $("#status").text("finish('fx') — panel at end state of all queued fade steps.");
    });
  </script>
</body>
</html>

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jQuery .finish('fx') — after fadeToggle spam (Try It)