N is a non-empty name string, B has the form .B', and B' is a FQDN string. (So, x.y.com domain-matches .y.com but not y.com.) Note that domain-match is not a commutative operation: a.b.c.com domain-matches .c.com, but not the reverse.Effectively, this means that that any subdomains of a given domain can set, and is sent the cookies for that domain, i.e. news.google.com can set, and is se