-In the HTML body tag, we use Javacript's onLoad event handler.
-We call Javascript's built-in focus method. (The self property refers to the window we're in.)
-The window that contains this tag will come to the front when it loads... great for pop-up windows.
We could also simply put our call in Javascript tags like so:
-In this scenario, we would get the same result of the window focusing when it loads, but we could also write this into a function to get different results.