From Birnam Designs Wiki

font can combine:

• font-style: italic
• font-variant: small-caps
• font-weight: bold
• font-size: 1em
• line-height: 140%
• font-family: "Lucida Grande",sans-serif

into:

font: italic small-caps bold 1em/140% "Lucida Grande",sans-serif;

Any values but font-size and font-family can be omitted.