The function font enables font selection.
| prototype | 
(font [:ident] [:class] [:size] [:face] node...) | 
| ident | html latex xml  | The node identifier. | 
| class | html latex xml  | The node class. | 
| size | html latex  | The size of the font. The size may be relative
(with respect to the current font size) or absolute. A relative
font is either specified with a floating point value or a negative
integer value. A positive integer value specifies an absolute font size. | 
| face | html  | The name of the font to be used. | 
node... | The nodes of the font. | 
Example:
(itemize
 (item (font :size -2 [A smaller font.]))
 (item (font :size 6 [An absolute font size.]))
 (item (font :size 4. [A larger font.]))
 (item (font :face "Helvetica" [An helvetica example.])))
 
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Ex. 8: The font markup
Produces:
- A smaller font.
 
- An absolute font size.
 
- A larger font.
 
- An helvetica example.
 
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