HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createNSResolver legacy</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <p>One</p>
  <p>Two</p>
  <button id="btn" type="button">Legacy-style evaluate</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var contextNode = document.documentElement;
      var resolver = document.createNSResolver(contextNode);
      var result = document.evaluate(
        "//*",
        document,
        resolver,
        XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
        null
      );
      document.getElementById("out").textContent = [
        "snapshotLength: " + result.snapshotLength,
        "resolver === contextNode: " + (resolver === contextNode)
      ].join("\n");
    });
  </script>
</body>
</html>

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Document.createNSResolver — legacy evaluate (Try It)