Text alternatives, are a primary way of making visual information accessible, because they can be rendered through many sensory modalities (for example, visual, auditory or tactile) to match the needs of the user. Providing text alternatives allows the information to be rendered in a variety of ways by a variety of user agents.

Mailing list for new content at the Web Design References site.

Comprehensive guide on HTML, CSS, Accessibility, &c.

Download IBM Equal Access Accessibility Checker for Firefox. A web developer tool that checks web applications for accessibility issues.