[whatwg] Proposal for cross domain security framework

[Adrian Sutton]

> The tools available:
The browser. The server. DNS servers.

Actually, DNS servers, particularly for reverse DNS lookups, are out of the
control of a huge number of authors on the web. Shared hosting accounts for
instance don't have a unique reverse IP look up. There are also plenty of
people who don't control their DNS at all for whatever reason.

Regards,

Adrian Sutton.
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