[css] [bug] :nth-last-... pseudo classes

[Bjoern H. <der...@gm...>]

Hi,

  I believe

  e:nth-of-type(-n+3)
  e:nth-last-of-type(n+3)

do not select the same elements. The first selector selects the first
three e elements while the second selector selects all but the last two
e elements. CSS::SAC however makes it impossible to tell the difference.