36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM

402.4 Characters.

At least one mode of characters displayed on the screen shall be in a sans serif font. Where ICT does not provide a screen enlargement feature, characters shall be 3/16 inch (4.8 mm) high minimum based on the uppercase letter “I”. Characters shall contrast with their background with either light characters on a dark background or dark characters on a light background.