Explanation Links go to more information and examples at CAST or W3C . It is also useful for users of text-only WWW tools like Lynx. Good primer on Color Blindness Link used with author's permission. Thirty percent of all males suffer from some form of color deficiency rendering colors as grays or spreading one color across several others. Choose text and background colors to provide maximum contrast.
Contrast is also very important for individuals who can see but have reduced vision.
Good design also refers to the ability of reader software to properly parse a page correctly left to right and up to down. Organization Documents shall be organized so they are readable without requiring an associated style sheet. Most sites have moved away from server-side image maps. The exception is for such things as geographical information system clickable maps . Using row and column headers becomes crucial when a table is larger than two columns or two rows.