       fill: 'both',
                  delay: 1000,
                  iterations: 2,
                  iterationStart: 0.5,
                  direction: 'alternate-reverse',
                  easing: 'steps(2, start)'
                },
    conditions: [
                  { currentTime: 0,    progress: 1 },
                  { currentTime: 1000, progress: 1 },
                  { currentTime: 1001, progress: 0.5 },
                  { currentTime: 2999, progress: 1 },
                  { currentTime: 3000, 