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Line height, also known as leading, controls the amount of space between baselines in a block of text. A text’s line height is proportional to its type size.
Line height is 1.4 x of the font size.
Line lengths for body text are usually between 40 and 60 characters. In areas with wider line lengths, such as a desktop, longer lines that contain up to 120 characters will need an increased line height from 20 pt to 24 pt.
Keep paragraph spacing in the range between 0.75 x and 1.25 x of the type size.