2.2. Make sure that there is sufficient contrast between informative and interactive graphic elements and the background
The contrast between informative and interactive graphic elements and the background must be sufficient.
It includes, in particular:
- Informative pictograms.
- Interactive pictograms alone, without label.
- Form fields.
Minimum contrast ratio
The minimum contrast ratio to reach between the informative/interactive graphic elements and the background color is of 3.
To test the contrast ratio, use, for example, the Colour Contrast Analyser tool.
Alternative style guidelines
If it is not practical to optimize the contrast, then sufficiently contrasted alternative style guidelines must be provided.