<!DOCTYPE html>
<html>
<body>
<p>
If you assign a value to a variable that has not been declared,
it will automatically become a GLOBAL variable:
</p>
<p id="demo"></p>
<script>
myFunction();
document.getElementById("demo").innerHTML =
"I can display " + carName;
function myFunction() {
carName = "Volvo";
}
</script>
</body>
</html>