%%% Testing:spacing
\documentclass{article}

\usepackage{textpos}
%\usepackage[showboxes]{textpos}

\hoffset=0pt
\voffset=0pt
\oddsidemargin=0pt
\topmargin=0pt
\headheight=0pt
\headsep=0pt

\setlength{\TPHorizModule}{50pt}
\setlength{\TPVertModule}{\TPHorizModule}

\pagestyle{empty}

\begin{document}

\setlength{\parindent}{0pt}
\setlength{\parskip}{30pt}
\setlength{\baselineskip}{20pt}

% Make sure that all text appears precisely where it ought to.  The
% above dimensions mean that text appears in round-number locations.
%
% The \showbox puts detailed calculations in the log file
%
% Output of dvireport:
% c 97[a] 0,20pt
% c 121[y] 4.72223,20pt
% c 98[b] 0,28.8889pt
% c 121[y] 5.27777,28.8889pt
% c 99[c] 50,76.25pt
% c 100[d] 0,70pt
% c 121[y] 5.55556,70pt
%
% The most important thing is that `a' and `d' are 50pt
% apart, \parskip+\baselineskip


\showboxdepth=8
\showboxbreadth=8

\noindent ay
\vrule height 20pt depth 0pt width 0pt  % strut
\begin{textblock}{3}(0,0)
\noindent by
\end{textblock}
\begin{textblock}{2}(1,1)
\noindent cy
\end{textblock}
\noindent
dy

%\showlists               % put detailed diagnostics into log file

\end{document}
