Success Criterion 1.4.6 - Level AAA
The visual presentation of text and images of text has a contrast ratio of at least 7:1, except for the following:
Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1.
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.
Text that is part of a logo or brand name has no contrast requirement.