title: Nested iframe cross-domain communication
body: <p>Here are two cases:
  Uppercase as one domain while lowercase as another
  1.Suppose window A holds iframe b, and b holds iframe C, A &amp; C in one domain(higher privacy) while b in another. Is there any direct way for communication between A &amp; C, oneway or twoway.
  2.Suppose A holds iframe b and iframe c, A is in one domain while B &amp; C in other, just the same question as outlined in the first case.</p>
  
  <p>I will really appreciate your answer, it will be better if with some javascript codes
  Thanks</p>