It transpires that the behaviour of [[wm geometry ...]] is quite different between the standard Tk platforms.  This page is to document those differences (since the wm man page doesn't do so).

The main differences are between whether this command manipulates/queries the entire window including borders/titlebar or just the contents, and in what aspects can be set/queried during a window's creation or while it is withdrawn.

...to be filled in...

''Windows''

...

''X11''

...

''MacOS X''

...