IE7 compatibility mode does not work in DNN 5.6

IE7 compatibility mode does not work in DNN 5.6

How do i get this meta-tag to work, so 开发者_如何学Pythonthat IE9 runs as browser mode IE7 compatibility and document mode IE7?

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />

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There is an MSDN article that is having full detail about this topic. Also there is another blog entry here that says, "It seems like the X-UA-Compatible tag has to be the first tag in the section."