[0, 1] },
    { duration: 1, endDelay: -Number.MAX_VALUE, iterations: 1 });
  effect.getComputedTiming();

  // very large iterations
  effect = new KeyframeEffect(null,
    { opacity: [0, 1] },
    { duration: 1, delay: 281474976710655, iterations: 18014398509481984 });
  effect.getComputedTiming();

</script>
