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"Accessibility is most often used to describe facilities or amenities to assist people with disabilities, as in "wheelchair accessible". This can extend to Braille signage, wheelchair ramps, audio signals at pedestrian crossings, walkway contours, website design, and so on." 
DHTML accessibility allows desktop-style widgets such as tree views, menu bars and spreadsheets which are accessible both with the keyboard and assistive technologies such as screen readers, screen magnifiers and alternative input devices.
Until now, web developers who want to make their styled <div> and <span> based widgets keyboard accessible have lacked the proper techniques. Keyboard accessibility is part of the minimum accessibility requirements of which any web developer should be aware.