title: inter-Iframe communication using postMessage
body: <p>I have a parent page of domain A (<a href="http://example.com">http://example.com</a>)</p>
  
  <p>On the parent page exists two iframes that are the same domain but not domain A. (<a href="http://test.com">http://test.com</a>)</p>
  
  <p>Is there any way to pass a value from one test.com iframe to the other when the parent is example.com or is the behavior I am describing against the ``rules'' of iframes </p>
  
  <p>Thanks</p>