The geometry package: Package lengths are not saved as lengths. Examples: layoutheight, tmargin The following only affect the complete layout: \savegeometry \loadgeometry \restoregeometry ...
Has someone precompiled a tabular or annotated graphical overview of the default lengths etc. of common LaTeX classes (standard, Koma/scr, memoir, beamer …) and put it on the net? I didn’t find any. ...