In European and West Asian typography, the baseline is the line upon which most letters “sit” and below which descender extend.
In the example to the right, the letter ‘p’ has a descender; the other letters sit on the (red) baseline.
Most, though not all, typefaces are similar in the following ways as regards the baseline:
– capital letters sit on the baseline. The most common exceptions are the J and Q.
– Lining figures (see Arabic numerals) sit on the baseline.
East Asian scripts have no baseline; each glyph sits in a square box, with neither ascenders nor descenders. When mixed with scripts with a low baseline, East Asian characters should be set so that the bottom of the character is between the baseline and the descender height.