Why does IE9 opens in Document Mode as IE7 standards?

Question

When I open a webpage in IE9 with DOCTYPE as

It opens Document Mode as IE7 standards.

I need default IE9 stan

Answer 1

You can set this in the web.config as well.

<system.webServer>
    <httpProtocol>
        <customHeaders>
            <clear />
            <add name="X-UA-Compatible" value="IE=edge" />
        </customHeaders>
    </httpProtocol>