ctive time in after phase with forwards fill and positive end delay'
   + ' is the active duration');

test(t => {
  const anim = createDiv(t).animate(null, { duration: 1000,
                                            iterations: 2.3,
                                            delay: 500,
                                            endDelay: -800,
                                            fill: 'forwards' });
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().currentIteration, 1);
  assert