<!DOCTYPE html>
<html>
<body>
<p>x = 10 and y = 5, calculate x %= y, and display x:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = 10;
var y = 5;
x %= y;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>