gtk
Applications that use gtkhtml wont let you set a default font size, such applications like gnucash etc, what happens when you goto use the print-report function of these apps and you are forced to print in 10 point html?
gtkhtml-properties.c:#define DEFAULT_FONT_SIZE 10
gtkhtml-properties.c:#define DEFAULT_FONT_SIZE_PRINT 10
there is no way to change this without recompiling the code, however it does not compile under debian because of a broken build script that does not detect some utility called GAIL