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CSS Layout - 如何将div标签对齐到其父级的顶部

children_parent 【children_parent】
我们想知道如何将div标签对齐到其父级的顶部。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.tripple {
  width: 90%;
  height: 100%;
  margin: 5%;
  border: solid;
}

.clearfix:before, .clearfix:after {
  content: " "; /* 1 */
  display: table; /* 2 */
}

.clearfix:after {
  clear: both;
}

.left, .right, .middle {
  float: left;
  width: 33%;
  height: 100px;
}

.left {
  background-color: red;
}

.middle {
  background-color: green;
}

.right {
  background-color: blue;
}
</style>
</head>
<body>
  <div class="tripple clearfix">
    <div class="left">test</div>
    <div class="middle">test</div>
    <div class="right">test</div>
  </div>
</body>
</html>