Color choices affect readability for users with visual impairments.
Contrast ratios (WCAG AA):
- Normal text: : minimum
- Large text (px+ or pt bold): : minimum
- UI components: : minimum
Don't rely on color alone:
- Error states: Use icons and text, not just red
- Charts: Use patterns, not just colors
- Links: Underline or bold, not just color difference
Tools: Check contrast with browser DevTools or online calculators.
Interview tip: Mention contrast when discussing design systems.