Websites with standards compliant code all follow the typical W3C standards. But there’s a whole different level of compliance when it comes to WCAG, also known as the Web Content Accessibility Guidelines.
These guidelines are organized and officiated by the same people who produce the HTML5/CSS3 specs, so it’s truly an international system of coding standards. Most web developers never bother with WCAG accessibility but it’s becoming a huge aspect of the Internet.
If you’re looking to understand accessibility or just want to delve a bit deeper into the subject then this guide is for you. I’ll explain some basics of WCAG conformance for a beginner, along with all the tools and resources you’ll need to keep learning along the way…
from Vandelay Design http://www.vandelaydesign.com/web-content-accessibility-guide/