The predicate for single-width fonts. This function is deprecated.
font-single-width-p port &optional font => result
font
A font or a font-description object.
result
A boolean.
The function font-single-width-p returns t when all characters in the font specified by font are of the same width.
font-single-width-p
t
A single-width font is fixed-width.
font-fixed-width-p font-description
CAPI User Guide and Reference Manual (Macintosh version) - 25 Feb 2015