You may be wondering why do I need to conform to these standards? Well... Here are some benefits:
Reduced markup: Less code means faster loading pages, which in turn means less bandwidth = less money.
Increased separation of content and presentation: By using Cascading Style Sheets (CSS) to control a site's design, updates and site wide changes become quicker and easier through the update of a single style sheet.
Improved accessibility: Web standards enable us to reach the highest possible number of browsers and devices. Forward compatibility: By authoring pages using web standards you are ensuring that they will be readable in future browsers.