<!DOCTYPE HTML>
<html lang="ru-RU">
<head>
<meta charset="UTF-8">
<style type="text/css">
fieldset{
width:80%;
display: -moz-box;
display: -webkit-flex;
display:flex;
}
fieldset div{
border:1px solid crimson;
flex:1;
-webkit-flex:1;
-moz-box:1;
width:200px;
height:100px;
line-height:100px;
text-align:center;
}
</style>
</head>
<body>
<fieldset>
<div > aa </div>
<div > bb </div>
</fieldset>
</body></html>
http://stackoverflow.com/questions/28078681/why-cant-fieldset-be-flex-containers
https://bugs.chromium.org/p/chromium/issues/detail?id=262679
参考上面2个链接 是bug
解决方案 换一个元素种类...