Close to 17 Million people use something other than Internet Explorer when cruising the Internet. Different Browsers Break Pages. If you aren't checking your pages under different browsers and computers combinations, you are potentially writing off business with anyone not using your specific computer configuration. Look at the picture below. This page looked fine under Internet Explorer, but a simple HTML error kept it from opening in Netscape .
People use different computers.
PCs may dominate the market, but there's over 5 Million people who use the Internet via a different platform. WebTV is also growing in popularity, especially among the elderly and disabled - two groups who are big consumers on the Internet. Different Computers Break Pages. Compare the picture below - this is the same page as it displays on a PC and Mac. People use different versions of browsers.