960 Demo

Col 1

Col 2

Col 3

Col 4

Col 5

Col 6

Col 7

Col 8

Col 9

Col 10

Col 11

Col 12

I am 1/3, or 4 columns, wide

Also have more content than the rest and we don't have a clear after the the first "row" of divs although we could put one in

I am 1/3, or 4 columns, wide

I am 1/2 wide

This is one third wide but has one column of blank space on the right by adding a suffix_1 class

This is 7 columns out of 12

The first child needs an alpha class

The alpha and omega classes have zero margins so the children can fit inside of the parent

The last child needs an omega class

This is not part of the parent