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You need to distinguish the first-level page (the page containing the iframe) from the second-level page (the page within the iframe). The login is submitted by the second-level page, so the returned content must also be the second-level page.
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You need to distinguish the first-level page (the page containing the iframe) from the second-level page (the page within the iframe). The login is submitted by the second-level page, so the returned content must also be the second-level page.