This is a pretty good read if you enjoy literature that makes your eyes bleed like me. And PX is 1 "dot" on your screen which is defined by the dots per square inch or resolution of your screen and thus different from screen to screen and is the worst way to define a font size. The most accurate way to define a font style is to use EM that way when you define a font-size for use, the dimension does not refer to the pixel height of the font, but to the fonts x height which is determined by the distance between the baseline and the mean line of the font.įor the record 1 PT is about 0.35136mm. And in TrueType fonts, the em size is usually either 1024 or 2048. In an OpenType font, the em size is supposed to be set to 1000 units. Now a days, font developers create their fonts on a computer without the limitations of a physical piece of metal so while the em still exists, its nothing more than an imaginary boundary in the software thus prone to being manipulated or disregarded altogether. Back when letters were created on metal, the em referred to the size of each block that the letter would be engraved on, and that size was determined by the capital M because it usually takes up the most space.
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