Css 引导程序（3.2.0）在iPhone内部Iframe中不起作用

我有一页有以下内容

 <title>xxxx</title> 
 <meta name="description" content="xxx"> 
 <meta name="keywords" content="xxx">
 <meta http-equiv="Content-Language" content="hi">
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
 <meta name="viewport" content="initial-scale=1.0, width=device-width, height=device-height, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">

 <meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>xxxxx</title>

引导和媒体查询的响应在任何型号的iPhone 3到6中都不起作用。 我在iframe链接中也尝试了以下内容

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> 
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport"  content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no,target-densityDpi=device-dpi"/>

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> 
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport"  content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no,target-densityDpi=device-dpi"/>