Does architrave go to the floor?

Architraves when framing a door run to the floor, with the skirting board butting into the side of the architrave. Sometimes a skirting block is used instead, meaning that the architraves run into the top of the block, and the skirting board comes out of the side of the block. This is useful when a different profile design, or thickness is used, or to create a more decorative finish.