GNU Info

(texinfo)Fonts

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Fonts for Printing, Not Info
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  Texinfo provides four font commands that specify font changes in the
printed manual but have no effect in the Info file.  `@i' requests
italic font (in some versions of TeX, a slanted font is used), `@b'
requests bold face, `@t' requests the fixed-width, typewriter-style
font used by `@code', and `@r' requests a roman font, which is the
usual font in which text is printed.  All four commands apply to an
argument that follows, surrounded by braces.

  Only the `@r' command has much use: in example programs, you can use
the `@r' command to convert code comments from the fixed-width font to
a roman font.  This looks better in printed output.

  For example,

     @lisp
     (+ 2 2)    ; @r{Add two plus two.}
     @end lisp

produces

     (+ 2 2)    ; Add two plus two.

  If possible, you should avoid using the other three font commands.  If
you need to use one, it probably indicates a gap in the Texinfo
language.