As you know, different browsers render your pages differently. Even if they support the same DTD standard, the results of certain tags can be quite varied. The BEST way to see how other browsers render your page is to check them in all the browsers. Though, as this method takes a lot of time, most suggest testing in 2 or 3 of the most commonly used browsers, and make sure your page validates.
Keep in mind, many people view with graphics turned off (or do not have the ability for graphics), and/or can not upgrade their browsers due to hardware compatibility (yes, there are still some people out there surfing the web with a 386, 4 Mb RAM, and a 9590 baud modem).