<!DOCTYPE html>
<html>
<body>
<p>
In HTML, all global variables will become window variables.
</p>
<p id="demo"></p>
<script>
myFunction();
document.getElementById("demo").innerHTML =
"I can display " + window.carName;
function myFunction() {
carName = "Volvo";
}
</script>
</body>
</html>