HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Inspect fx queue</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    #target { width: 80px; height: 80px; background: #f59e0b; border-radius: 8px; }

    pre { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 13px; }

    button { margin-top: 8px; padding: 8px 16px; margin-right: 8px; }

  </style>

</head>

<body>

  <div id="target"></div>

  <button type="button" id="queue">Queue effects</button>

  <button type="button" id="clear">clearQueue()</button>

  <pre id="log">Queue effects, then clear.</pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    var $el = $("#target");

    $("#queue").on("click", function () {

      $el.stop(true, true).clearQueue();

      $el.fadeIn(400);

      $el.animate({ opacity: 0.5 }, 800);

      $el.fadeOut(400);

      $("#log").text("pending count: " + $el.queue("fx").length);

    });

    $("#clear").on("click", function () {

      $el.clearQueue();

      $("#log").text("after clearQueue: " + $el.queue("fx").length);

    });

  </script>

</body>

</html>

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jQuery .clearQueue() — inspect fx queue length (Try It)