chromium/src/third_party/blink/web_tests/http/tests/security/dataURL/xss-DENIED-from-data-url-to-data-url-expected.txt

This tests that a data: URL subframe can't access a child data: URL subframe of itself.

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Frame: 'aFrame'
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Inner iframe.

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Frame: 'inner'
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PASS: Cross frame access from a data: URL was denied.

Inner-inner iframe.