My understanding of it now is, if I specify "font-size: 2;" in my Stylesheet, it is the same as if I wrote "font-size: 2pt;"  So in fact I haven't set the default font size to be "2" I have set it to be "2pt".  In which case, when I highlight a block of text in the CuteEditor and change the font size to 2, it correctly encapsulates that block of text in <font size=2>...</font>.

 

Is this correct?