代码：
html:
<body>
<div id = "wrap">
<div id = "header">
头部
</div>
<div id = "menu">
目录
</div>
<div id = "content">
<div class = "left">
<div class = "left-top">
</div>
<div class = "left-bottom">
</div>
</div>
<div class = "right">
<div class = "right-top">
</div>
<div class = "right-bottom">
</div>
</div>
</div>
<div id = "footer">
版权内容
</div>
</div>
</body>
css:
*{margin:0;padding:0;}
body{height:100%;}
#wrap
{
width:1580px;
margin:0 auto;
}
#header
{
width:100%;
height:100px;
margin:10px inherit;
background-color:blue;
}
#menu
{
width:100%;
height:70px;
margin:10px inherit;
background-color:green;
}
#content
{
width:100%;
height:300px;
margin:10px inherit;
background-color:red;
}
#footer
{
width:100%;
height:30px;
margin:10px inherit;
background-color:gray;
}
.left
{
width:65%;
height:100%;
margin:5px 5px;
background-color:#F1EA21;
float:left;
}
提问：为什么.left里面的height:100%会失效？其父容器#content明明设置了height:300px
求大神解答~~
http://www.weste.net/2014/4-28/96579.html
测试了没有问题啊，.left填充慢#content了。。
原因很简单，其父容器#content下面除了.left div还有与.left平级的div