为什么不能得到一个正方形,求解
<style type="text/css">
#box{border:1px solid red;width:50px;}
#box1{padding:50%;}
</style>
<span id="box">
<span id="box1"></span>
</span>
<style type="text/css">
#box{border:1px solid red;width:50px;}
#box1{padding:50%;}
</style>
<span id="box">
<span id="box1"></span>
</span>
2017-03-19
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