Any part of a browser that can make a request can be used to do this sort of thing. Any part of a browser that can alter the view and its related DOM attributes

Any part of a browser that can make a request can be used to do this sort of thing. Any part of a browser that can alter the view and its related DOM attributes can cause a user to interact with it and give up data involuntarily. Turn off JavaScript and CSS media queries can cause resources to load based on a number of parameters. Have canvas enabled and you can be fingerprinted. Use one browser over another and get feature detected. Anchor states give away browsing history. Hell even your IP address sacrifices privacy, and that's before the page gets rendered. So with that being said, if you're browsing the web, you're giving up information.