Did you also verify it isn't set on a global level with the server? I forgot to mention that you can define it for the entire IIS server, then it can also be defined on a per virtual server instance.
Additionally, do you have any custom javascripts included in the page that may be adding this dynamically without knowing since it wouldn't have to be in the page/masterpages markup?
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Re: IE11 http request header always has X-UA-Compatible: IE=EmulateIE7
Jul 16, 2014 02:07 PM|markfitzme|LINK
Did you also verify it isn't set on a global level with the server? I forgot to mention that you can define it for the entire IIS server, then it can also be defined on a per virtual server instance.
Additionally, do you have any custom javascripts included in the page that may be adding this dynamically without knowing since it wouldn't have to be in the page/masterpages markup?