This property specifies when fonts are substituted in export
operations. Only the DOCX and HTML exporters currently support
this property. It is ignored by other exporters, for example, the
The FontSubstitutionType enumeration may take the following
- Automatic - selects a sensible default value based on the
- Always - always substitute fonts with those installed on the
- Missing - only substitute fonts which are missing or could not
be converted to open type.