Color as Information

Color should never be the sole method of conveying information, indicating an action, prompting a response, or distinguishing a visual element. When color is the only indicator, users with color vision deficiencies may miss critical information.

For example, if required form fields are only indicated by red text, a color-blind user may not be able to distinguish them from optional fields. Instead, use additional indicators like asterisks, bold text, or explicit labels alongside color.

Practical Examples

Links within text should be distinguishable by more than just color. Use underlines or other visual cues in addition to color. Charts and graphs should use patterns or labels in addition to color coding. Form validation errors should include icons or text messages, not just red highlighting.