Type

:first-of-type 	 :last-of-type 	 :only-of-type 



li:first-of-type {background: green;} 
li:last-of-type {font-size: 24px;} 
li:only-of-type {font-style: italic;}

• Item 1 - green (it's the first list item in this UL)
• Item 2 - nothing cool
• Item 3 - font size 24px (it's the last item in this UL)

1. Sub-item - green (it's the first item in this OL); size 24 (it's also the last item of this OL); italic (it's the only item in this OL)