What is W3C compatibility?
The W3C (The World Wide Web Consortium) provides best practice standards and guidelines for the World Wide Web. Their mission is to lead the World Wide Web to it's full potential and to ensure that web technologies are compatible with one another. Their standards cover everything that is web-based, including search engine optimisation, web code and web accessibility.
The W3C Web Content Accessibility Guidelines exist to provide website owners with direction on making their websites accessible to visitors with disabilities. For further reading, please jump to Web Content Accessibility Guidelines.