Are wildcard SSL certificates supported across all browsers?

Question

Does anyone know if a wildcard certificate is supported across all browsers: IE6, IE7, IE8, Firefox, Chrome and Safari? If I were to access the following secured sites sharing one wildcard certificate across all browsers, I won't be prompted by the browser:

https://one.example.com
https://two.example.com
https://three.example.com

Answer 1

Yes, they will work in all browsers as long as you configure them properly.

Answer 2

The three addresses you listed there will work with a certificate for *.example.com. Be careful with other names you might add in the future if they have more words separated by periods. The meaning of * for certificates is inconsistent between browsers. Some will match anything, others will match only one word separated by periods.

https://one.example.com/        *.example.com    YES
https://two.example.com/        *.example.com    YES
https://www.one.example.com/    *.example.com    NO
https://www.two.example.com/    *.example.com    NO

Answer 3

The cert usually isn't the problem, but the issuing CA. Nowadays any major SSL provider is going to be compatible with 99% of browsers.