This tests whether flex-box behaves well with unusual children.
The boxes are width and height 100px.
With a position: absolute; child
With a position: fixed; child
With a position: relative; child
With a position: static; child
With a position: sticky; child
With a position: absolute; child
With a position: fixed; child
With a position: relative; child
With a position: static; child
With a position: sticky; child