ions: Infinity });
  effect.getComputedTiming();

  // Infinity end delay + Infinity active duration
  effect = new KeyframeEffect(null,
    { opacity: [0, 1] },
    { duration: 1, endDelay: Number.MAX_VALUE, iterations: Infinity });
  effect.getComputedTiming();

  // Infinity delay + Infinity active duration + Infinity end delay
  effect = new KeyframeEffect(null,
    { opacity: [0, 1] },
    { duration: 1,
      delay: Number.MAX_VALUE, endDelay: Number.MAX_VALUE,
      iterations: Infinity });
  effect.