Cross-origin access to 'window.event' should throw a SecurityError.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS frame.contentWindow.event threw exception SecurityError: Failed to read a named property 'event' from 'Window': Blocked a frame with origin "http://127.0.0.1:8000" from accessing a cross-origin frame..
PASS frame.contentWindow.event = 1; threw exception SecurityError: Failed to set a named property 'event' on 'Window': Blocked a frame with origin "http://127.0.0.1:8000" from accessing a cross-origin frame..
PASS successfullyParsed is true
TEST COMPLETE