# [NTG-context] difference between TeX behavior and ConTeXt

Lars Huttar lars_huttar at sil.org
Tue Nov 25 23:09:10 CET 2008

On 11/25/2008 3:27 PM, Aditya Mahajan wrote:
> On Tue, 25 Nov 2008, Lars Huttar wrote:
>
>> Hello,
>>
>> I've been reading through the TeXbook to solidify the foundations for
>> TeX programming. In an exercise on roman and italic text, ConTeXt seems
>> to behave differently from what the book specifies (Plain TEX) at a
>> fairly fundamental level.
>>
>> I could understand ConTeXt possibly changing the details of \rm's
>> definition, e.g. a change in default font family; but it would really be
>> surprising to find that the logic of \rm's behavior has been changed.
>>
>> principle of ConTeXt that I should be aware of...
>
> It is a design decision. See the chapter of typography
> (http://context.aanhet.net/svn/contextman/context-reference/en/co-typography.pdf)
> in the new manual (under preparation).
>

Thanks for the explanation.
I hope that when the manual is finished it will make this clearer.
Currently, the draft chapter says
"As will be explained later, the command \rm is used to switch to a
roman/serif/regular style"
which does not seem to be happening.

The explanation of \em shows that ConTeXt's \em has different behavior
from Plain TeX's \it (especially when nesting styles), but doesn't say
that \it or \rm have changed behavior.

Lars