HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isConnected Attr</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var el = document.createElement("a");
    el.setAttribute("href", "/docs");
    document.body.appendChild(el);
    var attr = el.getAttributeNode("href");
    document.getElementById("out").textContent =
      "el: " + el.isConnected + "\n" +
      "attr: " + attr.isConnected + "\n" +
      "ownerElement match: " + (attr.ownerElement === el);
  </script>
</body>
</html>

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Node.isConnected — Attr always false (Try It)