fontification-functions

fontification-functions is a variable defined in `C source code'.
Its value is

nil

• Automatically becomes buffer-local when set.
• This variable may be risky if used as a file-local variable.

Documentation:
List of functions to call to fontify regions of text.
Each function is called with one argument POS. Functions must
fontify a region starting at POS in the current buffer, and give
fontified regions the property `fontified'.