What does CSS measurement unit 'em' actually stand for? -


as title says, want know css unit 'em' stands for.
in 'cm' stands centimeter.

i not asking 'em' or how used!

i couldn't find answer on w3c.
wikipedia article saying "something":

the name of em related m. unit derived width of capital "m" in given typeface.

my interpretation of first sentence 'em' pronunciation/phonetic letter 'm'.
reading second sentence, seems 'e' in 'em' stands regarding width of letter 'm'.
i'm still lost, 'em' stands for!

that historical definition; in modern usage refers size of font, word "em" no longer having practical or relevant meaning. matter of fact, same wikipedia article expands on evolution in usage , meaning in a later section:

one em traditionally defined width of capital "m" in current typeface , point size, "m" commonly cast full-width of square "blocks", or "em-quads" (also "mutton-quads"), used in printing presses. however, in modern typefaces, character m less 1 em wide. moreover, term has expanded include wider variety of languages , character sets, meaning has evolved; has allowed include fonts, typefaces, , character sets not include capital "m", such chinese , arabic alphabet. thus, em means point size of font in question, same height of metal body font cast on.

particularly in terms of css, "em" doesn't refer width of capital m particular font; it's relative quantity.

if you're asking etymology of word "em", wikipedia contains reference adobe glossary, has little more it:

a common unit of measurement in typography. em traditionally defined width of uppercase m in current face , point size. more defined current point size. example, in 12-point type, em distance of 12 points.

it's not explicitly mentioned anywhere authoritative it's phonetic representation of capital m, considering namesake definition wouldn't rule out such possibility.


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