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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Named tasks queue</title>

  <style>

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

    pre { background: #f1f5f9; padding: 12px; border-radius: 6px; font-size: 13px; min-height: 5rem; }

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

  </style>

</head>

<body>

  <div id="worker">Worker element</div>

  <button type="button" id="run">Run tasks queue</button>

  <pre id="log">Click the button.</pre>

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

  <script>

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

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

      $el.clearQueue("tasks");

      $el.queue("tasks", function (next) {

        $("#log").append("Task A\n");

        next();

      });

      $el.queue("tasks", function (next) {

        $("#log").append("Task B\n");

        next();

      });

      $("#log").text("Pending tasks: " + $el.queue("tasks").length + "\n");

      $el.dequeue("tasks");

    });

  </script>

</body>

</html>

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jQuery .queue('tasks') — named custom queue (Try It)