Meta:Charset
Always place it as the first line inside <head>Example:
<head>
<meta charset="utf-8" />
...
Ensure everything after this declaration being decoded correctly. Ensure this declaration falls in the first 1024 bytes of the document.
Read more:
http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#charset1024
Meta:X-UA-Compatible
IE8, IE9, IE10 allows you to control document compatibility modes, so you can instruct the browser to render webpages in the same way as older browser versions.
The X-UA-Compatible header isn't case sensitive.
It must appear in the header of the webpage (the HEAD section) before all other elements except for the <title> element and other <meta> elements.
A web server can also be configured to specify the X-UA-Compatible header. If a web server specifies the header and the header also appears within the content of a webpage, the header in the webpage takes precedence over the one specified by the server.
Read more:
http://msdn.microsoft.com/en-us/library/cc288325(v=vs.85).aspx
<meta http-equiv="x-ua-compatible" content="IE=9" />
<meta http-equiv="x-ua-compatible" content="IE=8" />
<meta http-equiv="x-ua-compatible" content="IE=7" />
In many cases, this means you're limiting Internet Explorer to the features supported by that version.
<meta http-equiv="x-ua-compatible" content="IE=EmulateIE9" />
<meta http-equiv="x-ua-compatible" content="IE=EmulateIE8" />
<meta http-equiv="x-ua-compatible" content="IE=EmulateIE7" />
<meta http-equiv="x-ua-compatible" content="IE=edge" />
- Prevents incorrect header information from the server breaks the pages.
- It hides the compatibility view button from IE, reduce the chance that a user add the site into the list of compatibility view accidentally.
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