What is the correct usage of blueprint-typography-body([$font-size])?

Posted by Alexis Abril on Stack Overflow See other posts from Stack Overflow or by Alexis Abril
Published on 2010-05-14T22:38:34Z Indexed on 2010/05/14 22:44 UTC
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compass

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sass

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blueprint-css

Recent convert to RoR and I've been using Compass w/ Blueprint to dip into the proverbial pool. Compass has been fantastic, but I've come across something strange within the Typography library.

The blueprint-typography-body mixin contains the following:

=blueprint-typography-body($font-size: $blueprint-font-size)
  line-height: 1.5
  +normal-text
  font-size: 100% * $font-size / 16px

My question revolves around "font-size." I'm a bit lost, as I would expect to pass in a font size and have that size reflected upon page load. However, in this scenario the formula seems to dictate a percentage against the default font.

ie:

+blueprint-typography-body(10px) //produces 7.5px off of the default font size of 12px from what I can tell.

In essence, I'm curious if there is a standard to setting font size within Compass other than explicitly declaring "font-size: 10px".

Note: The reason I'm leaning towards Blueprint/Compass font stylings is due to the standardization of line-heights, fonts and colors.

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