HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createNSResolver identity</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Call createNSResolver(document.body)</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var node = document.body;
      var resolved = document.createNSResolver(node);
      document.getElementById("out").textContent = [
        "resolved === node: " + (resolved === node),
        "nodeName: " + resolved.nodeName,
        "typeof createNSResolver: " + typeof document.createNSResolver
      ].join("\n");
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Document.createNSResolver — returns input (Try It)