Clarifies restrictions on navigation in receiving browsing contexts. #436
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Addresses Issue #434: In receiver page, sandboxing flags do not fully block top-level navigation.
This adds two more specific requirements:
There might still be work to do here. For example, this doesn't directly address server initiated navigation (HTTP redirects). If we really want to restrict the scope of where the top level document can go, we may want to see if there are applicable mechanisms from Content Security Policy instead of (or in addition to) this language.
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