I plan on getting a wildcard certificate for my domain like *.example.com, but I've heard varying reports about whether it will also work with second-level subdomains like *.subdomain.example.com -- reports that it works in Firefox but not in other browsers.
If I want it to work with all browsers, will I need to purchase a wildcard certificate for *.subdomain.example.com?
Is there a place for more definitive information on how this works and with what browsers?