_time_equals_literal(anim.effect.getComputedTiming().progress, 0.5);
}, 'Active time in after phase with forwards fill and negative end delay'
   + ' is the active duration + end delay');

test(t => {
  const anim = createDiv(t).animate(null, { duration: 1000,
                                            iterations: 2.3,
                                            delay: 500,
                                            endDelay: -2500,
                                            fill: 'forwards' });
  anim.f