The final required attribute is duration, which specifies the time for this animation step in milliseconds.
最后一个必需的属性是duration，该属性指定动画所经历的时间，以毫秒计。
A micro animation is a piece of very short duration that performs a specific action which can promote video or GIF format.
微型动画是一件很短的持续时间进行特定的操作这里面可以将视频或GIF格式推广。
Duration in milliseconds of transition animation effect.
时间在过渡动画效果毫秒。
In either case, the animation goes through as many beginning-to-end runs that it needs in order to fill the requested count or duration.
无论是哪一种情况，动画都将从头到尾地不断运行，直到完成要求的次数或经历完所需的一段时间。
In either case, the animation goes through as many beginning-to-end runs that it needs in order to fill the requested count or duration.
无论是哪一种情况，动画都将从头到尾地不断运行，直到完成要求的次数或经历完所需的一段时间。
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