[progress.tentative.html]
  [progress of a newly created animation without an effect is unresolved]
    expected: FAIL

  [progress of an animation whose currentTime is unresolved is unresolved.]
    expected: FAIL

  [progress of an animation whose effect's endTime is zero is zero if its currentTime is negative.]
    expected: FAIL

  [progress of an animation whose effect's endTime is zero is one if its currentTime is non-negative.]
    expected: FAIL

  [progress of an animation whose effect's endTime is infinity is zero.]
    expected: FAIL

  [progress of an animation is calculated by currentTime / effect endTime.]
    expected: FAIL