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What are the security aspects of second-level domains like .co.uk?
Especially, when it comes to cross-site scripting and cookies stealing.
Many of basic security mechanisms on client rely on different 2nd-level comain names.
Does a developer keep special attention when developing for e.g. foo.co.uk?
Browsers are using a list of effective TLDs, instead of relying only on the level of the domain, for things such as allowing sites to set a cookie.
See http://publicsuffix.org/list/ . As seen here, this is used by Firefox, Chrome and Opera.