[mediasource-avtracks.html]
  [Check that media tracks and their properties are populated properly]
    expected: FAIL

  [Media tracks must be removed when the SourceBuffer is removed from the MediaSource]
    expected: FAIL

  [Media tracks must be removed when the HTMLMediaElement.src is changed]
    expected: FAIL

  [Media tracks must be removed when HTMLMediaElement.load() is called]
    expected: FAIL

