> A 1em font should probably be readable by someone with average eyesight everywhere Huh? this makes no sense, as ems are relative units, while points are abso

> A 1em font should probably be readable by someone with average eyesight everywhere Huh? this makes no sense, as ems are relative units, while points are absolute [0]. If the element has an inherited or defined text-size of 8pt, then within that element, 0.5em==4pt. Hence 1em in <body> is (by default) the default font size of the browser, generally 16pt. On topic: 12pt should be the same physical size everywhere. 12px should be the same logical size everywhere. [0] http://jsfiddle.net/8Mv6x/2/ http://jsfiddle.net/8Mv6x/2/