Texinfo provides one command to change the size of the main body font
in printed output for a document: @fonttextsize. It has no
effect in other output. It takes a single argument on the remainder
of the line, which must be either ‘10’ or ‘11’. For
example:
@fonttextsize 10
The effect is to reduce the body font to a 10pt size (the
default is 11pt). Fonts for other elements, such as sections
and chapters, are reduced accordingly. This should only be used in
conjunction with @smallbook (see @smallbook: Printing “Small” Books) or
similar, since 10pt fonts on standard paper (8.5x11 or A4) are
too small. One reason to use this command is to save pages, and hence
printing cost, for physical books.
Texinfo does not at present have commands to switch the font family to use, or more general size-changing commands.
Texinfo also provides a number of font commands that specify font changes in the printed manual and (where possible) in the HTML and DocBook output. They have no effect in Info. All the commands apply to a following argument surrounded by braces.
@b ¶selects bold face;
@i ¶selects an italic font;
@r ¶selects a roman font, which is the usual font in which text is printed. It may or may not be seriffed.
@sansserif ¶selects a sans serif font;
@slanted ¶selects a slanted font;
@t ¶selects the fixed-width, typewriter-style font used by @code;
The @r command can be useful in example-like environments, to
write comments in the standard roman font instead of the fixed-width
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.
The @t command can occasionally be useful for producing output in
a typewriter font where that is supported, but no distinction with
quotation marks is needed in Info or plain text. (Compare @t{foo}
producing foo with @code{foo} producing foo.) Here
are some possible reasons for using @t instead of @code:
In general, the other font commands are unlikely to be useful; they exist primarily to make it possible to document the functionality of specific font effects, such as in TeX and related packages.