Bobby is an online HTML analysis service provided by the Center for Applied Special Technology. What makes this service unique? It has the function of helping to make HTML documents accessible to those with disabilities. For example, blind users with screen-reading software depend on ALT tags for images, and users unable to manipulate a pointing device may have difficulty using forms. When a URL is entered and analyzed, an annotated version of the HTML document is given. Simply click on the error messages for explanations. To get a better understanding of what the error messages mean, look at the Understanding Bobby section. Bobby also has advanced options that allow users to check compatibility with more than one browser at the time, as well as to upload local files.