Cross Browser. Cross Platform. Cross Device. Pages designed using web standards are all of these. The web of today demands much more. Today’s web is viewed in a variety of ways, and users require sites that work well on all of them. The answer is clean markup and accessible design—XHTML and CSS. In other words, web sites that are viewable on a variety of platforms and devices, by a large percentage of users.
Rapid development. Faster load time. Increased accessibility. Because your site should work five years from now as well as it does today. Because you just can’t afford to use a web page that discriminates against users, no matter how small the percentage.