CONSOLE MESSAGE: line 62: SecurityError: Blocked a frame with origin "http://127.0.0.1:8000" from accessing a cross-origin frame. Protocols, domains, and ports must match.
This tests that the main frame doesn't have access to a data: URL loaded in an iframe inside another data: URL loaded iframe.

Test  
PASS: Cross frame access to a data: URL 2 levels deep was denied.


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Frame: 'aFrame'
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Inner iframe.


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Frame: '<!--frame1-->'
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PASS: Cross frame access to a data: URL 2 levels deep was denied.

Inner-inner iframe.