- return [self sizeWithStyle:[NSString stringWithFormat:@"%@;%@;%@", [font markupDescription], base, info] forWidth:width];
+ NSString *extra([NSString stringWithFormat:@"letter-spacing: %gpx", spacing]);
+ return [self sizeWithStyle:[NSString stringWithFormat:@"%@;%@;%@;%@", [font markupDescription], extra, base, info] forWidth:width];