WCAG – 1.4.3 Contrast Minimum (Level AA)
1.4.3 Contrast Minimum (AA): The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: (Level AA) 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 …