I don&#x27;t really see the problem with making this asymmetrical. The security implications of a frame navigating its parent and a parent navigating its child frame seem very clearly different to my mind.<p>If you&#x27;re suggesting it would be technically difficult, I&#x27;m extremely skeptical of that. The origin&#x27;s relationship to the target frame should not be impossible to discern, and I&#x27;d be a little shocked if it isn&#x27;t taken into account elsewhere.