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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>selector — find()</title>
  <style>
    pre { font-family: ui-monospace, monospace; font-size: 13px; }
    ul { font-family: system-ui, sans-serif; }
  </style>
</head>
<body>
  <ul id="menu">
    <li><a href="#">Link A</a></li>
    <li><a href="#">Link B</a></li>
  </ul>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
  <script>
    var $menu = jQuery("#menu");
    var $links = $menu.find("a");
    document.getElementById("out").textContent = [
      "After $("#menu"):",
      "  selector: " + $menu.selector,
      "  length: " + $menu.length,
      "",
      "After .find("a"):",
      "  selector: " + $links.selector,
      "  length: " + $links.length,
      "",
      "Warning: .selector still says "" + $links.selector + """,
      "but the set now holds <a> elements, not #menu"
    ].join("\n");
  </script>
</body>
</html>

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.selector — Stale After .find() (Try It)