SUIT CSS: leading offset utility tests

.u-beforeXof2

offsets by 1/2 of the parent container

1of2

.u-beforeXof3

offsets by 1/3 of the parent container

1of3
2of3

.u-beforeXof4

offsets by 1/4 of the parent container

1of4
2of4
3of4

.u-beforeXof6

offsets by 1/6 of the parent container

1of6
2of6
3of6
4of6
5of6

.u-beforeXof8

offsets by 1/2 of the parent container

1of8
2of8
3of8
4of8
5of8
6of8
7of8

.u-beforeXof10

offsets by 1/10 of the parent container

1of10
2of10
3of10
4of10
5of10
6of10
7of10
8of10
9of10

.u-beforeXof12

offsets by 1/12 of the parent container

1of12
2of12
3of12
4of12
5of12
6of12
7of12
8of12
9of12
10of12
11of12

.u-beforeNone

removes space before

4of12 / beforeNone