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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>xmlVersion concept</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;line-height:1.5}</style>
</head>
<body>
  <p>MDN legacy XML example:</p>
  <pre>&lt;?xml version="1.0"?&gt;</pre>
  <p>would yield <code>"1.0"</code> from <code>document.xmlVersion</code> on old XML docs.</p>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      "This HTML page: " + document.xmlVersion;
  </script>
</body>
</html>

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Document.xmlVersion — MDN version concept (Try It)