1. A method comprising using a computer to analyze legibility of multi-line text in an electronic document, wherein only three ratios are analyzed: a first ratio of character width and tracking between letters in the text; a second ratio of leading between lines of the text and average length of the lines; and a third ratio of visual luminance contrast between letters in the text and text background, the ratios analyzed independently of one another, each ratio compared to preset upper and lower legibility limits; wherein the lower and upper limits for the first ratio are 0.025:1 and 1:1.