I’ve been considering the idea of font stacks—using the well-known font-family CSS property—to list as many different fonts as possible in order to optimize the web site experience for a maximum number of users.
The following Unicode fonts support polytonic Greek:
New Athena Unicode is the most extensive font, since it contains all the characters of the other three fonts plus additional more specialized items from Unicode 5.0 and beyond: the Coptic block (U+2C80 etc.) , the Ancient Greek Numbers block (U+10140 etc.), the Old Italic block (U+10300 etc.), Ancient Greek Musical Notation block (U+1D200 etc.), and a few others.
Convertir depuis des translittérations et les alphabets non latins vers l’Unicode