HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createElement lowercase</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">Create BUTTON element</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var el = document.createElement("BUTTON");
      document.getElementById("out").textContent = [
        "tagName: " + el.tagName,
        "localName: " + el.localName,
        "HTMLButtonElement: " + (el instanceof HTMLButtonElement)
      ].join("\n");
    });
  </script>
</body>
</html>

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Document.createElement — lowercase tag (Try It)