This includes visitors who may be using Web browsers such as Netscape and Internet Explorer, text only browsers, slow modems, no audio output, as well as to people using assistive technology to access the Internet such as people with visual, hearing, physical, or cognitive impairments. Consider these simple guidelines when designing a Web site with the intent of promoting a high degree of accessibility and usability. For those who are not viewing images, either because they are using a text browser, speech readers, or who have just turned off the view graphic feature of their browser, always offer a text alternative within an image tag. The alt tag is used for short functional descriptions. The text within the alt tag is also displayed in some browsers while images are being loaded, or as a mouse-over.
Image maps require a client side map to insure accessibility.
A link should convey destination information. Click Here does not convey relevant information about the destination of the link and its destination. Good design dictates consistency and offers ease of navigation. For instance, placing a navigational bar in the form of text links at the same place on every page makes a site more easily navigated and accessible. When using images as a navigational aid, always offer a text list of the links.