l(anim.effect.getComputedTiming().progress, 0.5);
}, 'Active time in active phase and negative start delay is the local time'
   + ' minus the start delay');

test(t => {
  const anim = createDiv(t).animate(null);
  assert_equals(anim.effect.getComputedTiming().progress, null);
}, 'Active time in after phase with no fill is unresolved');

test(t => {
  const anim = createDiv(t).animate(null, { fill: 'backwards' });
  assert_equals(anim.effect.getComputedTiming().progress, null);
}, 'Active time in after pha