<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>
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</html>