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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.parseHTML() — trim</title>
</head>
<body>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var raw = "   <strong>Bold</strong>   ";
      var withoutTrim = $.parseHTML(raw);
      var withTrim = $.parseHTML(raw.trim());
      document.getElementById("out").textContent =
        "Without trim: " + withoutTrim.length + " nodes\n" +
        "With trim: " + withTrim.length + " nodes";
    })();
  </script>
</body>
</html>

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jQuery.parseHTML() — trim whitespace (Try It)