Avoid phrases such as click the red button or click the green button. For a person with a color deficiency, they may appear similar. Look at Using color, patterns or text to convey information in graphs , Colorized drawing and Using color in text pages. Avoid a busy, patterned background. Backgrounds provide a change, but sometimes they are so busy or overpowering that readers experience difficulty focusing on the content.
Some users have learning disabilities.
They may experience problems separating the text in the foreground from the graphic in the background. Depending on the background, this can be experienced by individuals without disabilities, too. If a patterned background is used, test the web page on a variety of systems and request feedback from users. Check the Busy background page. Be careful when using colored text and colored backgrounds An alternative to a patterned background is using a solid colored background.