A great article about accessibility and usability problems because of the limitations of (X)HTML.

” The W3C’s standards draft for Accessible Rich Internet Applications (ARIA) addresses those limitations. It provides new ways of communicating meaning, importance, and relationships, and it fills gaps in the (X)HTML specifications and increases usability for all users by enabling navigation models familiar from desktop applications. Best of all, you can start using ARIA right away to enhance the accessibility of your websites. “

http://alistapart.com/articles/waiaria

source: A List Apart