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Credential Management defines a parameter `sameOriginWithAncestors` which is set true if the responsible document is not either in a top-level browsing context, or is in a nested context whose heirarchy is all loaded from the same origin as the top-level context [1][2]. The individual credential types of CredMan can use this flag to make decisions on whether to error or not. Our Credential Management implementation right now is a shim to Web Authentication, which says that if `sameOriginWithAncestors` is false, return `"NotAllowedError"`. This ensures that https://webauthn.bin.coffee/iframe.html works, but the cross-origin https://u2f.bin.coffee/iframe-webauthn.html does not. [1] https://w3c.github.io/webappsec-credential-management/#algorithm-request [2] https://w3c.github.io/webappsec-credential-management/#algorithm-create [3] https://w3c.github.io/webauthn/#createCredential [4] https://w3c.github.io/webauthn/#getAssertion MozReview-Commit-ID: KIyakgl0kGv --HG-- extra : rebase_source : dace4f4d73823913bff759fce8255da8e18ad5e3