Working on Accessible Web Content Guidelines and Designing More Usable Documents
http://tracecenter.org/docs/navtools2001/index.html

Novak, Mark
University of Wisconsin
2001

Abstract:

Many individuals, especially those with visual, physical, and/or cognitive disabilities, have trouble navigating the content of data tables on the World Wide Web. These problems exist because most browsers do not allow keyboard navigation of the data tables, which is an essential technique used by many people with disabilities whether or not they use assistive technology (AT).