Most of us have experience creating “rounded” corners by erasing pixels. It’s a rudimentary web design technique — or so we always thought. But in the hands of Dan Cederholm, author of Web Standards Solutions, this seemingly simple technique paves the way for boxes and borders that can change sizes and colors at your whim.
While the methods we use to create accessible websites can be complex, the essential principles are simple: consider the obstacles your site presents to users who approach it differently than you do, then remove as many of those obstacles as you can. Trenton Moss provides a quick overview.