Function contrastRatio

contrastRatio(foreground: string, background: string): number
The WCAG contrast ratio between two colors, from 1 to 21.
Parameters
- foreground: string
  The CSS color string of the text.
- background: string
  The CSS color string of the surface.
Returns number
- The contrast ratio.
Example
```
contrastRatio("#ffffff", "#000000"); // 21
```
- Defined in packages/help/src/utils/color/color.ts:81