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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>delay named queue</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    pre { background: #f1f5f9; padding: 12px; border-radius: 6px; min-height: 5rem; font-size: 13px; }
    button { padding: 8px 16px; }
  </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");
      $("#log").text("");
      $el.queue("tasks", function (next) {
        $("#log").append("Step A\n");
        next();
      });
      $el.delay(500, "tasks");
      $el.queue("tasks", function (next) {
        $("#log").append("Step B (after 500ms delay)\n");
        next();
      });
      $el.dequeue("tasks");
    });
  </script>
</body>
</html>

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