- Em-dashes—like this according to convention. According to one convention. It is unusual but some style manuals require you to put spaces around m-dashes. I

- Em-dashes—like this according to convention. According to one convention. It is unusual but some style manuals require you to put spaces around m-dashes. I also don’t think that there are better serif screen fonts than Georgia by default on Macs. There is Hoefler Text which is nice (if a bit quirky and certainly polarizing) but I think having the page look the same everywhere is preferable to using Hoefler Text on the Mac and Georgia elsewhere.