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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getRootNode self</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var orphan = document.createElement("div");
    var inPage = document.body;
    document.getElementById("out").textContent =
      (orphan === orphan.getRootNode()) + "\n" +
      (inPage === inPage.getRootNode());
  </script>
</body>
</html>

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Node.getRootNode — self as root (Try It)