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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasFeature demo</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var modName = "HTML";
    var modVer = "2.0";
    var conformTest = document.implementation.hasFeature(modName, modVer);
    document.getElementById("out").textContent =
      "DOM " + modName + " " + modVer + " supported?: " + conformTest;
  </script>
</body>
</html>

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hasFeature legacy demo (Try It)