css - 当动画完成其序列时如何为元素设置动画

Question

我想在返回原始大小时为 parent-round-div 设置动画。是否可以在完成当前动画后制作动画？

这是我的代码:

.parent-round-div{
  position: absolute;
  border: 2px solid black;
  border-radius: 50%;
  width: 70px;
  height: 70px;
  background: green;
  -webkit-animation-name: sizeAnimate;
  -webkit-animation-duration: 2s ;
  -webkit-animation-iteration-count: infinite;
  animation-name: sizeAnimate;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}
.child-round-div{
  margin:10%;
  position:relative;
  top: 40%;
  left: 40%;
  transform: translate(-50%, -50%);
  border: 1px solid black;
  border-radius: 50%;
  height: 70px;
  width:70px;
  font-size: 50px;
  text-align: center;
  background: red;
}
@-webkit-keyframes sizeAnimate{
  from{
    width: 70px;
    height: 70px;
  }
  to{
    width: 80px;
    height: 80px;
  }
}
@keyframes sizeAnimate{
  from{
    width:70px;
    height: 70px;
  }
  to{
    width: 80px;
    height: 80px;
  }
}



<div class = "parent-round-div">
  <div class="child-round-div">
    A
  </div>
</div>

Answer 1

为了对我的问题给出正确答案而不是删除问题，我复制并粘贴了 Harry 的答案。 (在他评论的 jsfiddle 链接上找到)这是他的回答:

.parent-round-div {
  position: absolute;
  border: 2px solid black;
  border-radius: 50%;
  width: 70px;
  height: 70px;
  background: green;
  animation-name: sizeAnimate;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}

.child-round-div {
  margin: 10%;
  position: relative;
  top: 40%;
  left: 40%;
  transform: translate(-50%, -50%);
  border: 1px solid black;
  border-radius: 50%;
  height: 70px;
  width: 70px;
  font-size: 50px;
  text-align: center;
  background: red;
}
@keyframes sizeAnimate {
  0%, 100% {
    width: 70px;
    height: 70px;
  }
  45%, 55% {
    width: 80px;
    height: 80px;
  }
}

<div class="parent-round-div">
  <div class="child-round-div">
    A
  </div>
</div>

谢谢!