There is also a list of web design blogs and sites that include accessibility-related resources, a list of successful redesign projects, and a Library Website Hall of Fame. Accessibility - Treehouse lreehouse is a web design training site that teaches through the use of online videos with a test at the end. Individual videos are between 4 and 8 minutes in length. The Accessible Technology Coalition The Accessible Technology (AT) Coalition is a project of the Center for Accessible Technology, and its mission is "to develop a consumer driven, grassroots program that provides people with disabilities, and those that work with them, accurate answers to their technology questions allowing them to identify appropriate solutions. ..."