Getting ready for version 8

As you know, Microsoft in its IE browser, the eighth version promises improved support for web standards. They say that the browser will be completely or mostly rewritten from scratch. This is all well and good, but in practice this means that millions of pages optimized for previous versions of IE can be displayed with rather large artifacts in the new browser version. Microsoft, of course, is aware of a potential problem, and in the eighth part of the browser there will be support for rendering pages specific to the IE7 mechanism. In other words, the eighth browser will have compatibility mode with the seventh part, which, in other, will be controlled by the browser user.

However, programmers have access to another mechanism that will allow painlessly display the contents of the pages written for IE7 in the eighth version. This feature will be available through the HTTP header:

X-UA-Compatible: IE = EmulateIE7

in scale of a site, or with the help of meta directive:
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meta http-equiv = "X-UA-Compatible" content = "IE = EmulateIE7"

on the scale of one page.

All this is already supported in IE 8.1beta and also in version 7 through one of the updates released in June.
You can read more at this address .