[] (0) Mention that iframe can be used for probing local network HTTP servers. (This could also be done with other elements, like object, I guess, but I haven't mentioned that here.)
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7797 340c8d12-0b0e-0410-8428-c7bf67bfef74