Reply To: Some issues about relation between width/height and margin/padding/border

[Shikkediel]

On my turn, I don’t know what that means. Lol.
But as you can see on the pen, using box sizing I can’t access the parent’s actual width easily to position the sub elements (100% from the top and the next level 100% from the left). It’s subtle because only a 1px border is used but these have to be accounted for again.
Exactly what one would try to avoid with box-sizing.