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Last big e-mail on the subject: http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Jul/0207.html
*** Bug 23914 has been marked as a duplicate of this bug. ***
See also: http://lists.w3.org/Archives/Public/public-whatwg-archive/2012Dec/0006.html
Closing this as at this point same-origin <iframe>s are not implemented either.