<span class="xml"><span class="hljs-tag"><span style="font-size: 16px"><</span><span class="hljs-name"><span style="font-size: 16px">meta </span><span class="hljs-attr"><span style="font-size: 16px">name=</span><span class="hljs-string"><span style="font-size: 16px">"viewport" <br/></span><span class="hljs-attr"><span style="font-size: 16px">content=</span><span class="hljs-string"><span style="font-size: 16px">"width=device-width, initial-scale=1, user-scalable=no, minimal-ui" /></span> </span></span></span></span></span></span></span>
width: width of the viewport (range from 200 to 10,000, default is 980 pixels)
height: height of the viewport (range from 223 to 10,000)
initial-scale: initial scaling (range from >0 to 10)
minimum-scale: The minimum scale the user is allowed to zoom to
maximum-scale: The maximum scale the user is allowed to zoom to
user-scalable: Whether the user can manually zoom
meta name="apple-mobile-web-app-capable" content="yes" />
meta name="renderer" content="webkit">
meta http-equiv="X-UA-Compatible" content="IE=edge">
meta name="HandheldFriendly" content="true">
meta name="Mo bileOptimized" content="320">
meta name="screen-orientation" content=" portrait">
-- QQ forces vertical screen --> meta name="x5- orientation" content="portrait">
meta name="full-screen" content="yes"> meta name="x5-fullscreen" content="true">
meta name="browsermode " content="application">
meta name="x5-page-mode" content="app">
meta name="msapplication-tap-highlight" content="no">
1. apple-touch-icon
如果 apple-mobile-web-app-capable 设置为 yes 了，
那么在苹果机的safari上可以通过添加到主屏按钮将网站添加到主屏幕上。
而设置相应 apple-touch-icon 标签，则添加到主屏上的图标就会使用我们指定的图片。
2. apple-touch-startup-image
基于 apple-mobile-web-app-capable 设置为 yes ，
可以为WebApp设置一个类似NativeApp的启动画面。
和 apple-touch-icon 不同，
apple-mobile-web-app-capable 不支持sizes属性，
要使用media来加载不同的启动画面。
// iPhone <link>
<span class="hljs-comment">// iPhone Retina <link href=<span class="hljs-string">"apple-touch-startup-image-640x920.png" media=<span class="hljs-string">"(device-width: 320px) and (-webkit-device-pixel-ratio: 2)"<br/> rel=<span class="hljs-string">"apple-touch-startup-image" /></span></span></span></span>
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