[track-mode-not-changed-by-new-track.html]
  [A track appended after the initial track configuration does not change other tracks]
    expected:
      if (os == "mac") and debug: [PASS, FAIL]
      if (os == "win") and swgl: [PASS, FAIL]
      if (os == "linux") and fission: [PASS, FAIL]
