Tryit Editor v2.7

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<!DOCTYPE html>
<html>
<body>

<p>Click the buttons to create a KEYGEN element, one with autofocus and one without autofocus.</p>

<button onclick="myFunction()">Keygen with autofocus</button>
<button onclick="myFunction2()">Keygen without autofocus</button>
<br>

<script>
function myFunction() {
    var x = document.createElement("KEYGEN");
    x.setAttribute("autofocus", "autofocus");
    document.body.appendChild(x);
}

function myFunction2() {
    var y = document.createElement("KEYGEN");
    document.body.appendChild(y);
}
</script>

</body>
</html>