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HTML

CSS

CSS Base

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HTML

              
                .parent
  .child
  .child
  .child
  .child
.parent
  .child
  .child
  .child
  .child
  .child
.parent
  .child
  .child
  .child
  .child
  .child
  .child
.parent
  .child
  .child
  .child
  .child
  .child
  .child
  .child
              
            
!

CSS

              
                @import compass

$container-width: 200px
$element-height: 20px
.parent
  vertical-align: top
  display: inline-block
  width: $container-width
  background: lightgray
  border: 1px solid black
  position: relative
.child
  background: #13a8ad
  vertical-align: top
  width: 50%
  height: $element-height
  display: inline-block
  border: 3px black solid
  @include box-sizing(border-box)
    
//Magic starts here
//picks all elements with child-count 3n and makes every third 100% wide
.child:nth-last-child(3n):first-child
  &:nth-child(3n), & ~ :nth-child(3n)
    width: 100%
    
//picks all elements with child-count 2n+1(odd), but not 3n(taking last rule into regard) and make last-2 element 100% wide
.child:nth-last-child(2n+1):first-child
  &:not(:nth-last-child(3n))
    &:nth-last-child(3), & ~ :nth-last-child(3)
      width: 100%
              
            
!

JS

              
                
              
            
!
999px

Console