[setting-the-playback-rate-of-an-animation.html]
  [The playback rate affects the rate of progress of the current time]
    expected:
      if (os == "linux") and not asan and not tsan and debug and not fission: [PASS, FAIL]
      if (os == "linux") and not asan and not tsan and not debug: [PASS, FAIL]
      if (os == "win") and debug and (processor == "x86_64"): PASS
      if (os == "win") and not debug: PASS
      if os == "mac": PASS
      [PASS, FAIL]