Use features that enable activation of page elements via a variety of input devices.
For most of us a mouse and keyboard is all we need to navigate through web pages, but for some those two devices aren't enough. Many users rely on input and out put devices other than the standard mouse and keyboard.
Designing links and other features on web sites with these other devices in mind will make you pages much more accessible for the disabled. This approach to design is called "device-independence". W3C defines device-independence as:
"Users must be able to interact with a user agent (and the document it renders) using the supported input and output devices of their choice and according to their needs. Input devices may include pointing devices, keyboards, braille devices, head wands, microphones, and others. Output devices may include monitors, speech synthesizers, and braille devices."
Whatever the device, it doesn't require very much extra work to make your site compatible.
One simple attribute that can be used is the "tabindex" feature. By being able to simply press the tab button, users who don't use a mouse can navigate easily through the web site. Also, a logically designed web site will make tabbing that much easier for users.
Another attribute that can be implemented fairly easily is the "accesskey". Accesskey gives the designer the ability to assign links and other functions keyboard shortcuts.
Good example of this guideline
-This is a good example because the form uses a tabindex for navigation.