Color your site with care
The most common form of color deficiency, red-green color deficiency, affects approximately 8% of the population. Using ONLY colors such as these (especially to indicate required fields in a form) will make it more difficult for some visitors to your site to understand the meaning and messaging of your site. Depending on the sites construct it could create roadblocks in performing certain activities on your pages.
Other groups of people with disabilities, particularly users with learning disabilities, benefit greatly from color when used to distinguish and organize your content.
Be especially careful with light shades of gray, orange, and yellow.
To satisfy both groups, use color, but also be sure to use other visual indicators, such as an asterisk for required form fields. Be sure to also distinguish blocks of content from one another using visual separation (such as whitespace or borders).
- WCAG 2.0: Use of Color
- WebAIM: Color Contrast checker
- Color Safe
- Color Contrast
- Color Oracle Java App
- Contrast A
- Color - Oregon State University
- Article: Color and Contrast in E-Learning Design: A Review of the Literature and Recommendations for Instructional Designers and Web Developers (PDF)
- Article: Guide to Color Contrast and Conversion Rates