An object specifying the properties for a Font used in text operations.
The font family, one of 'serif', 'sanserif', ..., default value 'serif'.
The font size (including units), default value '10pt'.
The font style, one of 'normal', 'bold', default value 'normal'.
Specifies this object is a Font, value 'font'.
The font variant, one of 'normal', ... , default value 'normal'.
The font weight, one of 'normal', ..., default value 'normal'.