\doifmode{proof}{\setuppapersize[proof]}</texcode>
Then, when you compile the document in the normal manner, you will get <tt>A4</tt> paper on <tt>A4</tt> print paper; if you compile the document with <tt>–mode=proof</tt>, then you will get a <tt>A4</tt> paper on <tt>A3</tt> print paper.
= Notes =
<references />