From mboxrd@z Thu Jan  1 00:00:00 1970
From: rudolf.sykora@gmail.com (Rudolf Sykora)
Date: Wed, 30 Mar 2011 20:03:50 +0200
Subject: [9fans] plan9 ms .if h test
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On 30 March 2011 19:31, pmarin <pmarin.mail at gmail.com> wrote:
> To make it easier to write input files that can be formatted by both
> troff and htmlroff, htmlroff adds a new condition h which evaluates
> true in .if and .ie requests. The t condition continues to evaluate
> true, to accomodate input files trying to distinguish between troff
> and nroff. To write a conditional matching troff alone, use ?.if !h
> .if t?."
>
> http://swtch.com/plan9port/man/man7/htmlroff.html
>
> Cheers.
> pmarin.

Ok. Actually, it seems that troff evaluates anything it doesn't know as false:

.ie v .tm trueee
.el .tm falsee

% 9 troff a >/dev/null
falsee
%

(and the same happens to 'h').
Thanks!
Ruda