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38

answers:

2

I've seen sites with font-size:12px/2em (or similar) specified on the body.

What does this font sizing do exactly?

+2  A: 

12px is the font size and 2em is the line-height.

meder
+2  A: 

It's a shorthand for setting the font-size (12px) and the line-height (2em). Though, I didn't think you could do it on the font-size property, only on the font property.

theIV
+1 http://www.w3schools.com/css/css_font.asp
Haim Evgi