Most websites, large and small, are still held together with sticky tape. Under the surface, they rely on outdated methods to make them work.
Websites built using web standards, however, are more robust. They download faster, work on today’s and tomorrow’s browsers, and they are easier to update. Content and structure are separated, so if one presentation of your content is not appropriate, for people with sight problems - for example, or for web browsing on a handheld device, alternate presentation formats can easily be applied.