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color-accessibility-and-mode

Use this skill when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for users with color blindness or low vision. Trigger when picking text colors, designing for global compliance (WCAG, EAA, ADA), supporting dark mode, or auditing an existing palette for accessibility. Sub-aspect of `color`; read that first.

plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode/SKILL.md

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Nov 6, 2026
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# Color: accessibility and mode support

Accessibility-aware color isn't a polish layer; it's a constraint that shapes the palette from the start. Adding accessibility late is much more expensive than building it in. The core constraints: WCAG contrast ratios, color-blindness compatibility, high-contrast mode support, and dark-mode parity.

## WCAG contrast in practice

Required ratios (relative luminance):

| Content | Level AA | Level AAA |
|---|---|---|
| Body text (< 18pt regular or < 14pt bold) | 4.5:1 | 7:1 |
| Large text (≥ 18pt regular or ≥ 14pt bold) | 3:1 | 4.5:1 |
| UI components and graphical objects | 3:1 | (no AAA) |