[RTCRtpSendParameters-degradationPreference.html]
  [setParameters with invalid degradationPreference should throw TypeError on video transceiver]
    expected: FAIL

  [setParameters with degradationPreference set should succeed on video transceiver]
    expected: FAIL

  [setParameters with invalid degradationPreference should throw TypeError on audio transceiver]
    expected: FAIL

  [setParameters with degradationPreference set should succeed on audio transceiver]
    expected: FAIL