CONSOLE MESSAGE: SecurityError: Blocked a frame with origin "null" from accessing a cross-origin frame. Protocols, domains, and ports must match.
This tests that a data: URL subframe can't access a sibling data: URL subframe.

  

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Frame: 'firstSubFrame'
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Inner iframe.

Pass: Cross frame access from a sibling data: URL was denied.

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Frame: 'secondSubFrame'
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Inner iframe.

Test