If a site passes muster with Bobby, it's eligible for a CAST seal of approval that sites can display to show they're handicap-friendly.
A recent test of the program -- using ZDNN as a guinea pig -- shows just how many access glitches can crop up on commercial Web sites.
The ZDNN site delivered no less than 122 accessibility problems in a test run on Bobby last week.
The vast majority of the errors were failures to provide alternative text for images. This means blind readers, who use audio screen-reading programs, would be unable to find out what those images signify.
The Bobby program also offers tips for Webmasters on fixing accessibility problems.