[portals-host-post-message.sub.html]
  expected: ERROR
  [Calling postMessage after receiving onactivate event should fail]
    expected: FAIL

  [Message received after postMessage from portal host in cross-origin-portal]
    expected: FAIL

  [postMessage with invalid transferable should throw error]
    expected: FAIL

  [postMessage with array buffer without transfer]
    expected: FAIL

  [postMessage with message ports]
    expected: FAIL

  [Message received from cross-origin portal host with target origin correctly specified]
    expected: FAIL

  [postMessage should throw error when serialization fails]
    expected: FAIL

  [postMessage before and after portal navigation should work]
    expected: FAIL

  [postMessage with object message]
    expected: FAIL

  [Message received from same-origin portal host with no target origin specified]
    expected: FAIL

  [postMessage with array buffer with transfer]
    expected: FAIL

  [Message received after postMessage from portal host]
    expected: FAIL