canon-color-blindness
Installation
SKILL.md
CANON · Color Blindness
8% of men and 0.5% of women have some form of color vision deficiency. Designing for them isn't a special case; it's designing for 1 in 12 of your users.
The cardinal rule
Color is never the only signal. Every piece of information conveyed by color must also be conveyed by text, shape, pattern, or position. WCAG 1.4.1.
| Bad (color only) | Good (color + secondary signal) |
|---|---|
| Red dot = error | Red dot + "Error" text label |
| Green line vs red line on chart | Solid line vs dashed line + legend |
| Green = online, gray = offline | Filled circle = online, empty ring = offline |
| Red border on invalid field | Red border + error icon + error message below |