代码示例:(标识:cssref_anim_flex-basis)
<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 250px;
  height: 100px;
  border: 1px solid #c3c3c3;
  display: flex;
}

#main div {
  flex-grow: 0;
  flex-shrink: 0;
  flex-basis: 50px;
}

#myBlueDiv {
  animation: mymove 5s infinite;
}

@keyframes mymove {
  50% {flex-basis: 200px;}
}
</style>
</head>
<body>

<h1>flex-basis 的动画效果:</h1>

<p>Gradually change the flex-basis property of the BLUE div from 50px to 200px, and back:<p>

<div id="main">
  <div style="background-color:coral;">RED</div>
  <div style="background-color:lightblue;" id="myBlueDiv">BLUE</div>
</div>

<p><b>注释:</b>CSS 动画在 Internet Explorer 9 以及更早版本中不起作用。</p>

</body>
</html>
运行结果: