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“ There is a cross-domain scripting security rule that can become an issue in these scenarios. When a child container (IFRAME in this case) has JavaScript from a page within the same domain as the parent, that child can access elements within the parents document object model (DOM). But when the child is from a different domain, the child can no longer access the parent’s internals, nor can the parent access the child’s internal elements.
Developer Forums …Access denied in Iframe trying to modify parent page
