Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to create a SCRIPT element that alerts "Hello World!".</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var x = document.createElement("SCRIPT");
    var t = document.createTextNode("alert('Hello World!')");
    x.appendChild(t);
    document.body.appendChild(x);
}
</script>

</body>
</html>