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<!DOCTYPE html>
<html>
<body>
<h2>My Heading</h2>
<p>Play around with the code and click on the "Run" button to view the result.</p>
<p id="demo"></p>
<script>
let x = 5;
let y = 6;
let z = x + y;
document.getElementById("demo").innerHTML = "The value of z is: " + z;
</script>
</body>
</html>