HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Stalled queue demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }

    #box { width: 50px; height: 50px; background: #0284c7; margin: 12px 0; }

    #box.highlight { background: #f59e0b; }

    button { margin-right: 8px; padding: 8px 12px; }

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

  </style>

</head>

<body>

  <div id="box"></div>

  <button type="button" id="broken">Broken (no dequeue)</button>

  <button type="button" id="fix">Fixed (with dequeue)</button>

  <div id="status">Try Broken first — box stops mid-way.</div>

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

  <script>

    var $box = $("#box").css({ marginLeft: 0 });

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

      $box.stop(true, true).clearQueue().removeClass("highlight").css({ marginLeft: 0 });

      $box

        .animate({ marginLeft: 100 }, 800)

        .queue(function () {

          $box.addClass("highlight");

        })

        .animate({ marginLeft: 0 }, 800);

      $("#status").text("Broken: highlight added but box never returns — queue stalled.");

    });

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

      $box.stop(true, true).clearQueue().removeClass("highlight").css({ marginLeft: 0 });

      $box

        .animate({ marginLeft: 100 }, 800)

        .queue(function () {

          $box.addClass("highlight");

          $(this).dequeue();

        })

        .animate({ marginLeft: 0 }, 800);

      $("#status").text("Fixed: full round-trip completes after .dequeue().");

    });

  </script>

</body>

</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

jQuery .dequeue() — stalled vs fixed queue (Try It)