我有这个页面，它实际上在所有浏览器中都呈现得很好，这意味着.. 当浏览器收缩时，根据@media查询 css 设置显示布局的移动版本，但据我所知，在 IE8 中不显示。我该如何解决这个问题。
这是所有代码顺便说一句：
<html>
<head><style>
body{margin:0px; padding:0px;}
#a{height:150px; background-color:#ffffff; border-bottom:1px solid #CCC;}
#x{min-height:350px; margin-top: 10px; background-color:#CCC;}
#y{min-height:30px; margin-top: 10px; background-color:#CCC;}
@media all and (min-width:700px){
#b{width:100%; min-height:400px;}
#sep {
margin: auto;
overflow: hidden;
width: 960px;
}
#x{width:65%; float:left;}
#y{width:32%; float:right; }
#c{background-color:#656565; height:80px;}
.for-mob{display:none;}
.for-desc{background-color:green;}
}
@media all and (max-width:700px){
.for-mob{background-color:green;}
.for-desc{display:none;}
#b{width:100%; min-height:400px; }
#x{width:100%; display:block; }
#y{width:100%; display:block; }
#c{background-color:#656565; height:100px;}
}
</style></head>
<body>
<div id='a'> <h1>I am header </h1>
</div>
<div id='b'>
<div id='sep'>
<div id='x'>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
<h1>I am content </h1>
</div>
<div id='y'>
<h1>I am sidebar </h1>
</div>
</div>
</div>
<div class='for-desc'><h1>If you shrink the browser, I become invisible</h1> </div>
<div class='for-mob'><h1>If you maximize the browser, I become invisible</h1></div>
<div id='c'>
<h1> I am a simple footer </h1>
</div>
</body>