Use of Color (Accessibility)

Use of color in accessibility means not relying on color alone to communicate essential information or distinguish actions. A booking form that marks missing fields only with red borders may not provide enough information to someone who cannot perceive the color difference. Adding visible error text, an appropriate icon, or another clear cue makes the message more understandable. This principle differs from color contrast, which evaluates whether text or other visual elements are distinguishable from their backgrounds. Both deserve attention when choosing a site's design system. Businesses should test status messages, charts, calendars, and forms rather than assuming an attractive color palette is accessible.