What does it mean when you have two font sizes specified 22px/27px?

[plasma800]

font:normal 22px/27px Arial, Helvetica, sans-serif;

Im working on someone else's CSS and ran across this..... why is there two numbers specified and what does that do?

[computerbarry]

font:normal 22px/27px Arial, Helvetica, sans-serif;

The 27px is the line-height:27px; its the shorthand font declaration.

font-weight:normal;
font-size:22px;
line-height:27px;
font-family:Arial, Helvetica, sans-serif

The above = font:normal 22px/27px Arial, Helvetica, sans-serif;

[plasma800]

IC perfect thanks

[huit]

Sweet. I saw this shorthand for the first time yesterday and was wondering what it was also. Thanks for the info computerbarry! (and thanks plasma for asking the question ^^)