I&#39;m no expert, but this seems to work:<br><br>\setupcolors [state=start, system=rgb]<br><br>\def\bw#1{\framed[background=color,backgroundcolor=black]{\color[white]{#1}}}<br><br>\setuppagenumbering[command=\bw,location={header,margin}]<br>
\starttext<br>\input tufte<br>\stoptext<br><br><br><div class="gmail_quote">On Mon, Aug 24, 2009 at 12:32 AM, Vyatcheslav Yatskovsky <span dir="ltr">&lt;<a href="mailto:yatskovsky@gmail.com">yatskovsky@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello,<br>
<br>
How to make page number as white digit in a black square? (And place it on the right of the page)<br>
</blockquote><div><br>Since right is ambiguous(it could be header or footer) I think you will be able to figure it out <a href="http://texshow.contextgarden.net/cmd/en/setuppagenumbering">http://texshow.contextgarden.net/cmd/en/setuppagenumbering</a><br>
<br>HTH<br>
</div></div>