How the design of site be fine on moving from IIS 6 to IIS 7 without compatibility view enabled in web.config for entire website in IIS 7 server?

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How the design of site be fine on moving from IIS 6 to IIS 7 without compatibility view enabled in web.config for entire webiste in IIS 7 server? IE 11 version is used in both servers(IIS 6 and IIS 7)

In web.config we added this in IIS 6 and it worked.

<<pre lang="xml">?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer>
<httpProtocol>
<customHeaders>
<clear />
<add name="X-UA-Compatible" value="IE=EmulateIE6quot; />
</customHeaders>
</httpProtocol>
</system.webServer>
</configuration>


But in IIS 7 it isn't working.