The Americans with Disabilities Act (ADA) requires a high visual contrast between typography and backgrounds. The following chart demonstrates accessibility-compatible contrast ratios for typography. Only the color combinations shown are approved for use with Nareit typography.
Acceptable type and color combinations
White spaces with an “X” are not ADA-accessible combinations.
WCAG 2.0 AA compliance differentiates between text smaller than 18pt and text larger than 18pt (or text that is bold and larger than 14pt). ADA guidelines for the US can be found here: http://www.ada.gov/stdspdf.htm