HTML meta encyclopedia

The Meta tag is an auxiliary tag in the head area of ​​the HTML language. It is located between the head tag and the title tag at the head of the HTML document. It provides information invisible to the user.
Meta: That is, metadata (Metadata) is the data information of the data.

Metadata can be called using browsers (how content is displayed or pages are reloaded), search engines (keywords), or other web services.

In our vernacular, it is a useless tag by itself, but once certain effects are set inside it through other attributes, it works, so we call it "meta" data".

<!-- 定义文档的字符编码 -->
<meta charset="utf-8" /> 
<!-- 强制Chromium内核，作用于360浏览器、QQ浏览器等国产双核浏览器 -->
<meta name="renderer" content="webkit"/>
<!-- 强制Chromium内核，作用于其他双核浏览器 -->
<meta name="force-rendering" content="webkit"/>
<!-- 如果有安装 Google Chrome Frame 插件则强制为Chromium内核，否则强制本机支持的最高版本IE内核，作用于IE浏览器 -->
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"/>
<!-- 
    设置视窗大小
    width    设置layout viewport  的宽度，为一个正整数，或字符串"width-device"
    initial-scale    设置页面的初始缩放值，为一个数字，可以带小数
    minimum-scale    允许用户的最小缩放值，为一个数字，可以带小数
    maximum-scale    允许用户的最大缩放值，为一个数字，可以带小数
    shrink-to-fit=no IOS9中要想前面的属性起作用需要加上这个
    height    设置layout viewport  的高度，这个属性对我们并不重要，很少使用
    user-scalable    是否允许用户进行缩放，值为"no"或"yes", no 代表不允许，yes代表允许
-->
<meta name="viewport" content="width=device-width, initial-scale=1.0, shrink-to-fit=no, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<!-- 页面描述 -->
<meta name="description" content="不超过150个字符"/>
<!-- 页面关键词 -->
<meta name="keywords" content=""/>
<!-- 网页作者 -->
<meta name="author" content="name, email@gmail.com"/>
<!-- 
    搜索引擎抓取
    all：文件将被检索，且页面上的链接可以被查询； 
    none：文件将不被检索，且页面上的链接不可以被查询；
    index：文件将被检索； 
    follow：页面上的链接可以被查询； 
    noindex：文件将不被检索； 
    nofollow：页面上的链接不可以被查询。 
-->
<meta name="robots" content="index,follow"/>
<!-- 忽略页面中的数字识别为电话，忽略email识别-->
<meta name="format-detection" content="telphone=no, email=no"/>

<!-- IOS begin -->
<!-- 添加到主屏后的标题（iOS 6 新增） -->
<meta name="apple-mobile-web-app-title" content="标题">
<!-- 当网站添加到主屏幕快速启动方式，可隐藏地址栏，仅针对ios的safari (ios7.0版本以后，safari上已看不到效果) -->
<meta name="apple-mobile-web-app-capable" content="yes"/>
<!-- 是否启用 WebApp 全屏模式，删除苹果默认的工具栏和菜单栏 -->
<meta name="apple-touch-fullscreen" content="yes"/>
<!-- 添加智能 App 广告条 Smart App Banner（iOS 6+ Safari） -->
<meta name="apple-itunes-app" content="app-id=myAppStoreID, affiliate-data=myAffiliateData, app-argument=myURL">
<!-- 设置苹果工具栏颜色:默认值为 default（白色），可以定为 black（黑色）和 black-translucent（灰色半透明） -->
<meta name="apple-mobile-web-app-status-bar-style" content="black"/>
<!-- 不让百度转码 -->
<meta http-equiv="Cache-Control" content="no-siteapp" />
<!-- 针对手持设备优化，主要是针对一些老的不识别viewport的浏览器，比如黑莓 -->
<meta name="HandheldFriendly" content="true">
<!-- 微软的老式浏览器 -->
<meta name="MobileOptimized" content="320">
<!-- uc强制竖屏 -->
<meta name="screen-orientation" content="portrait">
<!-- QQ强制竖屏 -->
<meta name="x5-orientation" content="portrait">
<!-- UC强制全屏 -->
<meta name="full-screen" content="yes">
<!-- QQ强制全屏 -->
<meta name="x5-fullscreen" content="true">
<!-- UC应用模式 -->
<meta name="browsermode" content="application">
<!-- QQ应用模式 -->
<meta name="x5-page-mode" content="app">
<!-- windows phone 点击无高光 -->
<meta name="msapplication-tap-highlight" content="no">

<!-- 
    iOS 图标 begin 
    网站添加至ios桌面时的图标
-->
<!-- iPhone 和 iTouch，默认 57x57 像素，必须有 -->
<link rel="apple-touch-icon-precomposed" sizes="57x57" href="table_ico57.png">
<!-- Retina iPhone 和 Retina iTouch，114x114 像素，可以没有，但推荐有 -->
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="table_ico72.png">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="table_ico114.png">
<!-- Retina iPad，144x144 像素，可以没有，但推荐有 -->
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="table_ico144.png">

<!-- iOS 启动画面 begin -->
<!-- iPad 竖屏 768 x 1004（标准分辨率） -->
<link rel="apple-touch-startup-image" sizes="768x1004" href="/splash-screen-768x1004.png"/>
<!-- iPad 横屏 1024x748（标准分辨率） -->
<link rel="apple-touch-startup-image" sizes="1024x748" href="/Default-Portrait-1024x748.png"/>
<!-- iPad 竖屏 1536x2008（Retina） -->
<link rel="apple-touch-startup-image" sizes="1536x2008" href="/splash-screen-1536x2008.png"/>
<!-- iPad 横屏 2048x1496（Retina） -->
<link rel="apple-touch-startup-image" sizes="2048x1496" href="/splash-screen-2048x1496.png"/>
<!-- iPhone/iPod Touch 竖屏 320x480 (标准分辨率) -->
<link rel="apple-touch-startup-image" href="/splash-screen-320x480.png"/>
<!-- iPhone/iPod Touch 竖屏 640x960 (Retina) -->
<link rel="apple-touch-startup-image" sizes="640x960" href="/splash-screen-640x960.png"/>
<!-- iPhone 5/iPod Touch 5 竖屏 640x1136 (Retina) -->
<link rel="apple-touch-startup-image" sizes="640x1136" href="/splash-screen-640x1136.png"/>
<!-- IOS end -->

<!-- Windows 8 磁贴颜色 -->
<meta name="msapplication-TileColor" content="#000"/>
<!-- Windows 8 磁贴图标 -->
<meta name="msapplication-TileImage" content="icon.png"/>
<!-- 添加 RSS 订阅 -->
<link rel="alternate" type="application/rss+xml" title="RSS" href="/rss.xml"/>

<!-- sns 社交标签 begin -->
<!-- 参考微博API -->
<meta property="og:type" content="类型" />
<meta property="og:url" content="URL地址" />
<meta property="og:title" content="标题" />
<meta property="og:image" content="图片" />
<meta property="og:description" content="描述" />
<!-- sns 社交标签 end -->

Low version IE browser access problem

Add the code to force the Webkit kernel, and use the domestic browser to access the website IE no longer exists If there is a compatibility issue, the number of IE visitors will be greatly reduced. But it is still inevitable that some old computers will access through lower versions of IE browsers. If we specifically perform CSS HACK for this very small number of users, it will seriously increase our workload.

What's more, Microsoft has stopped providing support and updates for versions below IE11 since January 2016. There has been no update for such a long time. Lower versions of IE not only have problems with CSS3 and HTML5 support, but also have security issues.

So, if we don’t support lower versions of IE, what will this small group of users do?

We can use the if IE statement to add an IE upgrade prompt to the website, prompting the user to upgrade the browser, or switch to a more advanced browser before visiting again.

We can add a piece of code under the meta tag just now to jump to the IE upgrade prompt page (jump when the IE version is lower than IE11), so that users of lower versions of IE can be prompted to upgrade or replace when they visit. browser.

Forcing the Webkit kernel and prompting low-version IE access users to upgrade. The complete code is as follows. Just add this code to the head template file under the 93f0f5c25f18dab9d176bd4f6de5d30e tag:

<meta name="renderer" content="webkit"/>
<meta name="force-rendering" content="webkit"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<script>/*@cc_on window.location.href="http://support.dmeng.net/upgrade-your-browser.html?referrer="+encodeURIComponent(window.location.href); @*/</script>

（ @cc_on is a conditional compilation statement unique to IE10 and older versions of IE, so it can be used to determine whether it is other IE versions other than IE11.)

Because when accessing lower versions of IE, they are often incompatible with CSS3 and HTML5 websites. Wrong version. The above code has been added. When users of lower versions of IE access it, they will jump to the upgrade prompt page to avoid unnecessary resource loading and reduce website server overhead.

Test code

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <meta name="renderer" content="webkit"/>
    <meta name="force-rendering" content="webkit"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <script>/*@cc_on window.location.href="http://support.dmeng.net/upgrade-your-browser.html?referrer="+encodeURIComponent(window.location.href); @*/</script>
  </head>
  <body>
        <h1>Hello world</h1>
  </body>
</html>

IE 11 will output normally

IE 10 will You will see the following page

Recommended tutorials: "PHP" "HTML"

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