HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getRootNode detached</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var element = document.createElement("p");
    var child = document.createElement("span");
    element.append(child);
    var rootNode = child.getRootNode();
    document.getElementById("out").textContent =
      (element === rootNode) + "\n" +
      (element === element.getRootNode());
  </script>
</body>
</html>

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Node.getRootNode — detached tree (Try It)