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Animation - 如何用伪元素创建颜色过渡

transition 【transition】
我们想知道如何用伪元素创建颜色过渡。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
div#elem {
  background: red;
  border: 1px solid green;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
}

div#elem:hover {
  background: green;
  border-color: red;
}

div#elem:before {
  content: 'before';
  background: green;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
}

div#elem:hover:before {
  background: red;
}

div#elem:after {
  content: 'after';
  background: green;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
}

div#elem:hover:after {
  background: red;
}
</style>
</head>
<body>
  <div id="elem">Hello World</div>
</body>
</html>