The head tag of a Sitefinity page contains standard attributes related to the meta data, css scripts, embedded resources. These are standard HTML attributes. You can modify the way that controls are added to the Head by overriding AddHeaderControls method of InternalPage class. You should create a custom class that inherits from InternalPage and then set your custom page inside Sitefinity/cmsentrypoint.aspx
<%@ Page Inherits="InternalPageCustom" MasterPageFile="~/Sitefinity/Dummy.master" %>
The Google Analytics code should be added before the closing </body> tag.
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