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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.escapeSelector hash</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #out { font-family: monospace; background: #f1f5f9; padding: 12px; border-radius: 6px; }
  </style>
</head>
<body>
  <p>Official example: escape <code>#target</code> for use in a selector.</p>
  <div id="out"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var escaped = $.escapeSelector("#target");
    $("#out").html(
      'Input: "#target"<br>' +
      'Output: "' + escaped + '"<br>' +
      'Use in selector: "#" + $.escapeSelector("#target")'
    );
  </script>
</body>
</html>

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jQuery.escapeSelector('#target') — escape hash (Try It)