WCAG 2.0 color contrast - How strict do you need to follow?

1. What level criteria is required for the color contrast ratio to pass?
2. What is the minimum contrast ratio needed according to the WCAG?
3. What is an acceptable contrast ratio?
4. What is the minimum color contrast ratio required for the large text with respect to its background?

What level criteria is required for the color contrast ratio to pass?

WCAG 2.0 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).

What is the minimum contrast ratio needed according to the WCAG?

A contrast ratio of 3:1 is the minimum level recommended by [ISO-9241-3] and [ANSI-HFES-100-1988] for standard text and vision.

What is an acceptable contrast ratio?

Color Contrast Ratios Guidance

Whenever using color in images, ensure that the colors have a contrast ratio of at least 4.5:1. This ensures that the text is still readable to those who may have color blindness.

What is the minimum color contrast ratio required for the large text with respect to its background?

Large Text. Large-scale text and images of large-scale text have a contrast ratio of at least 3:1; Incidental.