[writer-iframe.tentative.https.html]
  [Throw a 'NotAllowedError' when creating Writer within cross-origin iframe]
    expected: FAIL

  [Writer can be created within cross-origin iframe with permission policy]
    expected: FAIL

  [Writer can be used within same-origin iframe]
    expected: FAIL

  [Writer is unavailable within cross-origin iframe]
    expected: FAIL

  [Writer is available within cross-origin iframe with permission policy]
    expected: FAIL

  [Writer is available within same-origin iframe]
    expected: FAIL