This is a testharness.js-based test.
[FAIL] The current page being cross-origin must prevent the BroadcastChannel message from being seen
promise_test: Unhandled rejection with value: object "SecurityError: Failed to read a named property 'BroadcastChannel' from 'Window': Blocked a frame with origin "http://web-platform.test:8001" from accessing a cross-origin frame."
Harness: the test ran to completion.