Making Design Accessible: Fonts, Color Contrast, and Alt ... Good accessible font types have a certain level of legibility, including good height, width, and thickness. Font availability is also very important. Ideally, it’s best to use a font that is fairly popular and available to most users. Fonts on the “Highly Recommended” list are considered among the highest-rated with regard to readability, legibility, and availability. Fonts on the ...