I don't really want to get into a long-winded discussion, but (a) the GUI definition in Delphi is also code (specifically: there's a declarative syntax for constructing a tree of components with property values); and (b) positioning is handled by the VCL. Typically you specify things like alignments and borders in the designer, and the VCL takes care of keeping things positioned.

I really wish HTML was as easy to design with as the VCL designer. Trying to e.g. create vertically centered children is far, far easier in the VCL than in HTML + CSS.