HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createElementNS XHTML</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">Compare XHTML vs HTML div</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var xhtmlNS = "http://www.w3.org/1999/xhtml";
      var divNS = document.createElementNS(xhtmlNS, "div");
      var divHTML = document.createElement("div");
      document.getElementById("out").textContent = [
        "divNS.namespaceURI: " + divNS.namespaceURI,
        "divHTML.namespaceURI: " + divHTML.namespaceURI,
        "divNS instanceof HTMLDivElement: " + (divNS instanceof HTMLDivElement)
      ].join("\n");
    });
  </script>
</body>
</html>

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Document.createElementNS — XHTML div (Try It)