This was presented at the Amigos Library Services' HTML5 & CSS3 Online Conference http://www.amigos.org/HTML5_CSS3 on February 8, 2013. It's basically how to make a site more accessible, focusing on HTML5 & CSS3, but not necessarily (or only) for persons with disabilities.
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When the website was moved to a Content Management System, I updated our template to use HTML5 and CSS3. In particular, I used media queries to make the website responsive, and to fulfill some of the web accessibility guidelines. I also used some CSS3 to do some of the basic styling of the site, such as tables. Problems presented themselves, particularly with Internet Explorer. I spent a fair amount of time fixing IE issues, but left others to "degrade nicely".
Full writeup: http://cynng.wordpress.com/2013/02/27/making-the-website-more-accessible-with-html5-css3/