What We Don't Know
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On any given request for a website, there is precious little we know about the players involved. We don't know who the user is, where they live, what they speak, really anything about them. They are using a browser, but we don't know what that browser is. We don't know how they interact with that browser. That browser is on some device that we don't know about and we don't know how that device connects to to the internet.
All we know is about the server where our website is hosted and the files we put there. We can make a better web by accommodating these unknowns.