On 9/19/16 6:49 PM, Jim Blandy wrote:
   grandparent (origin O)
       parent (origin P, P != O)
           child (origin O, same as grandparent)

then the grandparent and the child are in the same UoRSOBC. The grandparent
can say `frame.contentWindow.frames[0]` to get its grandchild

frame.contentWindow should return null in this case.

But the grandparent can do window[0][0] (aka window.frames[0].frames[0]) to get the grandchild.

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