css - SVG 图像 CSS3 动画

Question

我需要在无限 CSS3 动画中使气泡聊天的第一个点可见和不可见。

为什么我的代码不起作用？

@keyframes onoff {
  0% { display: none; }
  25% { display: block; }
  50% { display: none; }
  100% { display: block; }
}
#circle1 {
  animation: onoff 5s infinite;
}

<svg xmlns="http://www.w3.org/2000/svg" width="240" height="240" viewBox="0 0 24 24">
  <g stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" fill="none">
    <path d="M.5 16.5c0 .553.447 1 1 1h2v4l4-4h15c.552 0 1-.447 1-1v-13c0-.553-.448-1-1-1h-21c-.553 0-1 .447-1 1v13z" />


    <!--Annimation on this cicle-->

    <circle id="circle1" cx="8.5" cy="10" r=".5" />

    <!-- -->

    <circle id="circle2" cx="16.5" cy="10" r=".5" />
    <circle id="circle3 " cx="12.5" cy="10" r=".5" />
  </g>
</svg>

Answer 1

display 属性不可设置动画 ( see MDN )。您可以为 opacity 设置动画尽管。

示例:

@keyframes onoff {
  0%, 100% { opacity: 0; }
  50%      { opacity: 1; }
}
#circle1 {
  animation: onoff 2s infinite;
}

<svg xmlns="http://www.w3.org/2000/svg" width="240" height="240" viewBox="0 0 24 24">
  <g stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" fill="none">
    <path d="M.5 16.5c0 .553.447 1 1 1h2v4l4-4h15c.552 0 1-.447 1-1v-13c0-.553-.448-1-1-1h-21c-.553 0-1 .447-1 1v13z" />
    <circle id="circle1" cx="8.5" cy="10" r=".5" />
    <circle id="circle2" cx="16.5" cy="10" r=".5" />
    <circle id="circle3 " cx="12.5" cy="10" r=".5" />
  </g>
</svg>