accessible-color-matrix
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WCAG AAA isn't addressed
Currently the tool only cares if the contrast ratio is 4.5 or not, which is WCAG AA, but WCAG AAA specifies a ratio of 7:1.
Since this seems like something that is decided once (e.g. at an organizational level) rather than used for individual design decisions, it might be appropriate to have it be a selector/checkbox of some sort.
Traditionally, 18F adheres to the AA level of compliance, so this feature addition isn't critical at the moment.