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How to declare and print value of variable in JavaScript?

In the example below, we create a variable called userName and assign the value "John1234" to it.

Then we "output" the value inside an HTML paragraph with id="test" 
<!DOCTYPE html>
<html>
<body>

<div id="test"></div>

<script>
var userName = "John1234";
document.getElementById("test").innerHTML = userName;
</script>

</body>
</html>
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