The background of this paragraph should be yellow, and the text should be purple, and it should be in a sans-serif font.
If the above paragraph is displayed as described, then the stylesheet has been loaded. The stylesheet is about 100K because it contains a lot of whitespace. Thus by experimenting with going back/forward and with exiting and loading the page again later, you should be able to tell how stylesheet caching works in your browser.
(Back to CSS Testing Information, David Baron)