I am having an issue with the Euro currency sign HTML entity when viewing in GMail.
I am using € instead of € and this shows as a square box/bad character in GMail when using Firefox, whereas when I switch it to € it works.
It doesn't seem to affect Yahoo! email accounts, only GMail from what I have seen so far.
Some research leads me to believe that € is less widely supported than € and I should switch, however i'd ike to know which should be used for conformity and support?
It's probably a character encoding issue. € simply means character number 128 from the ISO 10646 codepage, which is technically undefined. For historical reasons, most browsers map these characters according to windows-1252, but this is anything but standardized behavior. €, however, unambiguously maps to the euro currency sign, regardless of character encoding. There is a third option: use the unicode code point for the euro sign (€). This, too, should work in any browser. And finally, you can put a literal euro sign into the HTML, but if you do, you need to make sure you set the correct encoding in your content-type headers, so that the receiving user agent can make sense of it.