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According to WCAG 2.1 Guideline 1.4 , users must be able to see and hear content including separating foreground from background.
WCAG 2.1 level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. WCAG 2.1 requires a contrast ratio of at least 3:1 for graphics and user interface components (such as form input borders). WCAG Level AAA requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.
1.4.3 Contrast (Minimum) - According to WCAG 2.1
The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following:
- Large text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1;
- Incidental: Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.
- Logotypes: Text that is part of a logo or brand name has no contrast requirement. You can learn more about how to make your documents, emails, videos, websites, and mobile apps accessible by visiting our document library or request training .
More informationUnderstanding 1.4.3
How to meet 1.4.3