<html>
<body>
<button onclick="myFunction()">Click me</button>
<p id="demo"></p>
<p>A function is triggered when the button is clicked. The function outputs some text in a p element with id="demo".</p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Hello World";
}
</script>
</body>
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</html>