http-equiv attribute | httpEquiv property
Examples
This example causes the browser to reload the document every two seconds.
<meta http-equiv="refresh" content="2">
This example sets the character set for the document.
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
This example disables theme support for the document.
<meta http-equiv="msthemecompatible" content="no">
This example tells Internet Explorer to display a webpage in IE9 mode, if possible.
<meta http-equiv="X-UA-Compatible" content="IE=9">
reference:http://msdn.microsoft.com/en-us/library/ms533876(v=vs.85).aspx