What is a box-style soccer goal?

A box-style soccer goal is a goal that has equal back-depth on the top and the bottom of the goal. For example a soccer goal with a height of 8′, a width of 24′ a top back-depth of 6′ and bottom back-depth of 6′ would be a box-style soccer. Whereas another popular size goal with a height of 8′, a width of 24′ a top back-depth of 3′ and bottom back-depth of 8′ would not be.