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  <title>deferred.always() — reject</title>
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  <h1>always() after reject</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var lines = [];
      var dfd = $.Deferred();

      dfd.fail(function (reason) {
        lines.push("fail: " + reason);
      });

      dfd.always(function () {
        lines.push("always: cleanup runs anyway");
      });

      dfd.reject("Network error");
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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jQuery deferred.always() — reject path (Try It)