IE=8
<meta http-equiv="X-UA-Compatible" content="IE=8" />
This
forces IE 8 to display the page in Internet Explorer Standards mode.
IE=EmulateIE8
<meta http-equiv="X-UA-Compatible"
content="IE=EmulateIE8" />
This forces IE 8 to use the !DOCTYPE
declaration in the page to determine the rendering mode.
IE=EmulateIE8和IE=IE8的区别,布布扣,bubuko.com
原文：http://www.cnblogs.com/lvfeilong/p/htlml1.html