You're not wrong on the first point, but I imagine consistency with the front and back of the index was on the spec designers minds. I do have to point out tha

You're not wrong on the first point, but I imagine consistency with the front and back of the index was on the spec designers minds. I do have to point out that your second point is not correct. Remember it's not grid areas, it's grid dividers. So the final grid line <strong>is</strong> in fact -1. See my very hasty little Codepen: https://codepen.io/jodi/pen/ZeNRJZ https://codepen.io/jodi/pen/ZeNRJZ