I hate to bring the bad news but, without some added mechanism, this would only work for truly static pages (i.e. those where the same .html file is served over and over again) whereas most of the content served is tainted with server generated “fluffy”, which could range from some ads on the sidebar to the very text of an article being changed. My point is: even if we both visit the same “page” at the same time, it’s more likely than not that we’ll get different versions served, even if they differ only by a few lines of code and would look identical as far as the actual content is concerned.