hfy-display-class

hfy-display-class is a variable defined in `htmlfontify.el'.
Its value is

nil

Documentation:
Display class to use to determine which display class to use when
calculating a face's attributes. This is useful when, for example, you
are running Emacs on a tty or in batch mode, and want htmlfontify to have
access to the face spec you would use if you were connected to an X display.

Some valid class specification elements are:

'(class color)
'(class grayscale)
'(background dark)
'(background light)
'(type x-toolkit)
'(type tty)
'(type motif)
'(type lucid)
Multiple values for a tag may be combined, to indicate that any one or more
of these values in the specification key constitutes a match, eg:

'((class color grayscale) (type tty)) would match any of:

'((class color))
'((class grayscale))
'((class color grayscale))
'((class color foo))
'((type tty))
'((type tty) (class color))

and so on.

You can customize this variable.