title: Is it possible to select the last n items with nth-child?
body: <p>Using a standard list, I'm trying to select the last 2 list items. I've various permutations of <code>An+B</code> but nothing seems to select the last 2:</p>
  
  <pre><code>li:nth-child(n+2) {} /* selects from the second onwards */
  li:nth-child(n-2) {} /* selects everything */
  li:nth-child(-n+2) {} /* selects first two only */
  li:nth-child(-n-2) {} /* selects nothing */
  </code></pre>
  
  <p>I'm aware of a new CSS3 selectors like <code>:nth-last-child()</code> but I'd prefer something that works in a few more browsers if possible (don't care about IE particularly).</p>