This is a test headline
Here is a link to follow to get you started yourself: Quick Start, Google font directory
And yes, it looks like Google is indeed serving up css where the specified font family is linked via obfuscated URL at a googleusercontent subdomain (themes). Browsers will behave a little differently.
Chrome will render the page, but until the font has loaded, there will be a blank space in it’s place. Firefox will render default font text and once the font has loaded, replace the text. It’s called “flash of unstyled text.” Safari renders like Chrome. Internet Exploder renders like Chrome as well.