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Just to clarify - em is a relative unit of measurement and preferable to fixed measurements such as pt, pc, mm and cm, for accessibility reasons.
Think of em as the equivalent of the default capital 'M', with ex beng the equivalent of the lower-case 'x'
Use decimal to apply proportion, so 2em is twice the size of the default capital 'M'.
1.2em is equivalent to 120% of the default capital 'M'.
Most browsers will equate 2ex to 1em, though it is possible the browser will only support em not ex.
To apply a different StyleSheet to printed output use
<link rel="StyleSheet" type="text/css" href="print.css" media="print">
Note older browsers don't support the media attribute, but if a browser does it is most likely to support the 'print' value but not necessarily the alternative values of 'braille', 'speech' and 'handheld' for example.
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