Right, for that checking parent against a whitelist would be enough, as long as you do it in all A pages.
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: Sure. Though it's often the case that some pages are more interesting than others, and policies differ.
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: The page with interesting data (A1) might want SAMEORIGIN, while the widget page (A2) might not.
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: Ideally, the origin assertion would walk up from A2 to the top. Though there may be more complex relationships.
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