The web design industry is still in it's teens, it's amazing to think how rapidly it has progressed in merely 20 years. In comparison, the film industry would still in the silent era.
There are limitations to web design that do not affect other disciplines such as print. Web designers have always been limited to a certain number of web safe fonts. If the visitor doesn't have the font installed, they will not see it.
This article highlights the problems caused by these limitations, the solutions that have been developed and the benefits of such typographic freedom on the web.