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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>holdReady — late</title>
</head>
<body>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var lines = [];
    $(function () {
      lines.push("Ready already ran");
      $.holdReady(true);
      lines.push("holdReady(true) after ready — no effect");
      $(function () {
        lines.push("Inner handler still runs immediately");
        document.getElementById("out").textContent = lines.join("\n");
      });
    });
  </script>
</body>
</html>

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jQuery.holdReady — too late (Try It)