Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<h1>JavaScript in Body</h1>

<p id="demo">A Paragraph.</p>

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

<script>
function myFunction() {
    document.getElementById("demo").innerHTML = "Paragraph changed.";
}
</script>

</body>
</html>