<meta> analysis

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The HTML meta element represents any metadata information that cannot be represented by one of the other HTML meta-related elements (<base>, <link>, <script>,<style> or <title>).
Depending on the attributes set, the kind of metadata can be one of the following:
  • If name is set, it is document-level metadata, applying to the whole page.
  • If http-equiv is set, it is a pragma directive, i.e. information normally given by the web server about how the web page should be served.
  • If charset is set, it is a charset declaration, i.e. the charset used for the serialized form of the webpage.
  • If itemprop is set, it is user-defined metadata, transparent for the user-agent as the semantics of the metadata is user-specific.
  meta  always be inside the tag head.

Attributes

  • character encoding
<meta charset='utf-8'>
或
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
utf-8 means the language could be English,Chinese,Japanese,Korea and so on.  gb2312 means Simple Chinese .big5 means traditional Chinese.
And first one is recommended for html5 site.

  • browser version
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
content="IE=edge,chrome=1": prior to newest IE version or chrome. 
<meta http-equiv="X-UA-Compatible" content="IE=6" />;<!-- IE6 --> 
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" ><!-- IE7 --> 
<meta http-equiv="X-UA-Compatible" content="IE=8" /><!-- IE8 --> 
<meta http-equiv="X-UA-Compatible" content="IE=edge" /><!--IE newest-->
  • SEO related
<meta name="description" content="<150 characters" />
Less than 150 characters to describe the website for being searched.
<meta name="keywords" content="html5, css3, keywords"/>  
keywords to find out the site.
<meta name="author" content="Yvonne" />
The author of the site, which is not neccessory in the head.
  • refresh and relocate
<meta http-equiv="Refresh"  contect="5;url=http://www.helloweba.com" />
refresh the page after 5s and link to the website url.

  • expire date of site
<meta http-equiv="Expires" contect="Mon,12 May 2016 00:20:00 GMT" />
When expire, user should invoke from server.
  • forbid cache localhost
<meta http-equiv="Pragma" contect="no-cache" />
The browser refresh the page every time so that users can't load page without internet.

  • viewport screen scale
4.7-5 inch 360px
5.5 inch 400px
iphone6 375px
iphone6 plus 414px
<;meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
width is the device-width default 980px. 0<initial-scale<10. minimun-scale: user zoom out mini scale.  maximum-scale: user zoom out max scale.  user-scalable: whether user could zoom out manually. 
  • web-App fullscreen
<meta name="apple-mobile-web-app-capable" content="yes" />
  • setting status bar and color
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
In condition of web-App fullscreen.
  • setting status bar title
<meta name="apple-mobile-web-app-title" content="标题" />
ignore recognize telphone number automatically
<meta content="telephone=no" name="format-detection" />
  • ignore recognize email automatically
<meta content="email=no" name="format-detection" />


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