Definition
Colour contrast
The brightness ratio between text and its background. Sufficient contrast is required for readability (a very common WCAG criterion).
Colour contrast measures the brightness difference between text and its background. WCAG AA require a ratio of at least 4.5 to 1 for body text, and 3 to 1 for large text.
Insufficient contrast is one of the most frequent problems. It is fixed by adjusting colours, without touching the page structure.
See also
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