          iterations: 2.3,
                                            delay: 500,
                                            fill: 'both' });
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().currentIteration, 2);
  assert_time_equals_literal(anim.effect.getComputedTiming().progress, 0.3);
}, 'Active time in after phase with \'both\' fill is the active duration');

test(t => {
  // Create an effect with a non-zero duration so we ensure we're not just
  // testing the after-phase behavior.
 