About font appointment

I found this css

body {
font: 13px/1.231 arial,helvetica,clean,sans-serif;
*font-size: small;
*font: x-small;
}

What is 1.231?

From stackoverflow ffffff

• The value 1.231 is the value for the line-height property (see the font shorthand property for further information). The number without a unit refers to the element’s font size.

  Prashant : yes that's the line-height property value, as given and explained here: http://www.smashingmagazine.com/2008/08/18/7-principles-of-clean-and-optimized-css-code/ For more explaination of font styling see this image: http://media2.smashingmagazine.com/images/clean-optimized-code/figureB.gif
  From Gumbo