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From: Taco Hoekwater <taco@elvenkind.com>
Newsgroups: gmane.comp.tex.context
Subject: Re: framed parameter
Date: Fri, 30 Jun 2006 18:45:02 +0200
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Xref: news.gmane.org gmane.comp.tex.context:29060
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Hans van der Meer wrote:
> Is this somewhat inconsistent behaviour intrinsic to some parameters? 

It _is_ consistent, but not in the way you expect. :-)

The rule is: you cannot have multiple parameters inside the \if 
statement, because that confuses the keyval parser that then picks up
  "\iftrue background=color"
as a  complete item.

If you really need this, use \expanded around \framed and its option
list, like so:

   \expanded{\framed[frame=on,\iftrue
                   background=color,backgroundcolor=green\fi]}{abc}

Greetings, Taco