Commonly used meta organization

The

tag provides metadata about the HTML document. The metadata is not displayed on the page, but is machine-readable. It can be used by browsers (how content is displayed or pages are reloaded), search engines (keywords), or other web services.

　Required attributes

Property	Value	Description
content	some text	Define meta-information related to http-equiv or name attribute

　Optional attributes

Property	Value	Description
http-equiv	content-type/expire/refresh/set-cookie	Associate the content attribute to the HTTP header.
name	author/description/keywords/generator/revised/others	Associate the content attribute to a name.
content	some text	Define the format used to translate content attribute values.

　SEO optimization

　Reference documentation

• Page Keywords, each web page should have a unique set of keywords that describe the content of that web page.
  Use descriptive and representative keywords and phrases that people are likely to search for, and accurately describe the information provided on the page. Mark content that is too short and search engines may not consider it relevant. Also tags should not exceed 874 characters.

<meta name="keywords" content="your tags">

• Page Description, each web page should have a description tag that is no longer than 150 characters and accurately reflects the content of the web page.

<meta name="description" content="150 words">

• Search engine indexing method, robotterms is a set of values ​​separated by commas (,), usually with the following values: none, noindex, nofollow, all, index and follow. Make sure to use the nofollow and noindex attribute values ​​correctly.

<meta name="robots" content="index,follow">
<!--
    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，但页面上的链接可以被查询；
    nofollow：文件将不被检索，页面上的链接可以被查询。
 -->

• Page redirection and refresh: The number in the content represents the time (seconds), that is, how long it takes to refresh. If you add a url, it will redirect to the specified web page (search engines can automatically detect it, and it can easily be regarded as misleading by the engine and be punished).

<pre class="brush:html;toolbar:false"><meta http-equiv="refresh" content="0;url=">

• Others

<meta name="author" content="author name"> <!-- 定义网页作者 -->
<meta name="google" content="index,follow">
<meta name="googlebot" content="index,follow">
<meta name="verify" content="index,follow">

　Mobile devices

• viewport: Can optimize the display of mobile browsers. If the website is not responsive, do not use initial-scale or disable scaling.
  The viewport width of most 4.7-5-inch devices is set to 360px; 5.5-inch devices are set to 400px; iphone6 ​​is set to 375px; iphone6 ​​plus is set to 414px.

<meta name="viewport" content="width=device-width; initial-scale=1.0;maximum-scale=1.0; user-scalable=no;">
<!-- `width=device-width` 会导致 iPhone 5 添加到主屏后以 WebApp 全屏模式打开页面时出现黑边  -->

1. width: width (number / device-width) (range from 200 to 10,000, default 980 pixels)
2. height: height (numeric value / device-height) (range from 223 to 10,000)
3. initial-scale: initial scaling (ranging from >0 to 10)
4. minimum-scale: The minimum ratio the user is allowed to zoom to
5. maximum-scale: The maximum ratio the user is allowed to zoom to
6. user-scalable: whether the user can manually shrink (no,yes)
7. minimal-ui: You can minimize the upper and lower status bars when the page loads. (deprecated)

　Note that many people use initial-scale=1 on non-responsive websites, which causes the website to render at 100% width and the user needs to manually move the page or zoom. If user-scalable=no or maximum-scale=1 is used together with initial-scale=1, the user will not be able to zoom in/out the web page to see the entire content.

• WebApp full screen mode: Disguise app, offline application.

<meta name="apple-mobile-web-app-capable" content="yes"> <!-- 启用 WebApp 全屏模式 -->

• Hide status bar/set status bar color: Only takes effect when WebApp full screen mode is turned on. The value of content is default | black | black-translucent.

<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">

• Title after adding to home screen

<meta name="apple-mobile-web-app-title" content="标题">

• Ignore numbers and automatically recognize them as phone numbers

<meta content="telephone=no" name="format-detection"> 

• Ignore identifying email

<meta content="email=no" name="format-detection">

• Add Smart App Banner Smart App Banner: Tell the browser the app corresponding to this website, and display the download banner on the page (as shown below). Reference documentation

<meta name="apple-itunes-app" content="app-id=myAppStoreID, affiliate-data=myAffiliateData, app-argument=myURL"> 

• Other Reference documents

<!-- 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">

　Webpage related

• Declare encoding

<meta charset="utf-8">

• Prioritize using the latest version of IE and Chrome

<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<!-- 关于X-UA-Compatible -->
<meta http-equiv="X-UA-Compatible" content="IE=6"><!-- 使用IE6 -->
<meta http-equiv="X-UA-Compatible" content="IE=7"><!-- 使用IE7 -->
<meta http-equiv="X-UA-Compatible" content="IE=8"><!-- 使用IE8 -->

• Browser kernel control: Many domestic browsers have dual kernels (webkit and Trident). The webkit kernel allows high-speed browsing, and the IE kernel is compatible with web pages and old versions of websites. Websites that add meta tags can control which kernel rendering the browser chooses. Reference documentation

 <meta name="renderer" content="webkit|ie-comp|ie-stand">

The default kernel mode of domestic dual-core browsers is as follows:

　1. Sogou high-speed browser, QQ browser: IE kernel (compatibility mode)

　2. 360 Speed ​​Browser, Aoyou Browser: Webkit kernel (speed mode)

• Prohibit the browser from accessing page content from the local computer’s cache: With this setting, visitors will not be able to browse offline.

<meta http-equiv="Pragma" content="no-cache">

• Windows 8

<meta name="msapplication-TileColor" content="#000"> <!-- Windows 8 磁贴颜色 -->
<meta name="msapplication-TileImage" content="icon.png"> <!-- Windows 8 磁贴图标 -->

• Site Adaptation: Mainly used for PC-mobile page correspondence.

<meta name="mobile-agent" content="format=[wml|xhtml|html5]; url=url">
<!--
[wml|xhtml|html5]根据手机页的协议语言，选择其中一种；
url="url" 后者代表当前PC页所对应的手机页URL，两者必须是一一对应关系。
 -->

• Transcoding statement: Opening a webpage with Baidu may cause it to be transcoded (such as posting advertisements). To avoid transcoding, you can add the following meta

<meta http-equiv="Cache-Control" content="no-siteapp">

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