One of the mysteries of the English language finally explained.
1A unit for measuring the width of printed matter, equal to the height of the type size being used.
- ‘It doesn't matter which unit you use - zero horseshoes is the same as zero pixels, ems, or percentages.’
- ‘Sterne was almost compulsively attentive to page layout and typography, going so far as to specify the length of each dash in printer's ems.’
- ‘From there, sizing descendant elements with ems (a relative unit of measurement) becomes much more logical: 1em is 10 px, 1.6em is 16 px, .9em is 9px, and so forth.’
- 1.1 A unit of measurement equal to twelve points.
- ‘So, a font size of 1.25 ems will be displayed as 1.25 pixels.’
- ‘This reduced the text to an unreadable level when the CSS specified sizes in ems, but only reduced it slightly when specified as percentages.’
Late 18th century: the letter M represented as a word, since it is approximately this width.
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