Targeting first 2 children or last 2 children

Question

I know a bunch of the pseudo classes (first-child, last-child, nth-child) but I am having trouble selecting the first 2 children in a list or the last 2, the list is dynamic and changes all the time so i cant target based on counting the li's

<ul>  <li></li>  <li></li>  <li></li>  <li></li>  <li></li>  <li></li> </ul> 

Answer 1

For the first two children you can use:

ul li:nth-child(-n + 2) {     color: orange; } 

http://jsfiddle.net/nYnSz/1/

For the last two:

ul li:nth-last-child(-n + 2) {     color: orange; } 

http://jsfiddle.net/nYnSz/