< meta HTTP-EQUIV = "x-ua-compatible" content = "ie=edge,chrome=1"/>
If Google Chrome FRAME:GCF is supported, use GCF rendering
If you are using IE8 or later, use the highest version of IE to render
Otherwise, this setting can be ignored.
X-ua-compatible is a proprietary <meta> attribute of IE8, which tells IE8 which version of IE to use to render Web pages in the HTML
Why do you use x-ua-compatible?
when IE8 just launched, many web pages due to the problem of refactoring, unable to adapt to the higher level of the browser, so use the x-ua-compatible tag force IE8 to be rendered in a low-version manner.
After using this code, developers do not have to consider whether the Web page is compatible with IE8 browser, as long as the Web page in IE6, IE7 performance can be
<meta http-equiv= "x-ua-compatible" content= "ie=7"/>
Whether the page contains <! or not The doctype> directive uses the standard rendering mode of Windows Internet Explorer 7.
<meta http-equiv= "x-ua-compatible" content= "ie=8"/>
the standard rendering mode of IE8 is turned on, but since the x-ua-compatible file header supports only IE8 or above, it is equivalent to redundant code
<meta http-equiv= "x-ua-compatible" content= "ie=ed