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Is it possible to control (using either php or javascript), how long the link to the page will be considered visited by the browser. For example, if my site contents is updated every 3 days, I would want the page to be considered visited only during the time whyle it remains unchanged (3 days). And after that it should be displayed as unvisited link.
Seems impossible. In my opinion the browsers searches in the cache/history given for a visit and then decides what to do. No way for you to change that.
Maybe sending some header? I now that there is header that controls expire date. Yet I tried all headers that I new, and nothing happened.
I believe, that controlling visited/unvisited links is very important in the situation I described. So there should be some way.
I think there is a no-cache header but I think that it is specifically for cookies/ sessions.
I suppose you could achieve this by setting a cookie, and then switching css-statements according to what you retrieve from it? Seems a little over the top though. :)
I believed that I already tested no-cach header. But I will test it again.
As for cookies. Yes, it is not bad idea. You can save URLs in a cookie. Then use javascript to go through the all the links and set colors. And if user has firewall or smth, than the behavior of the links will be browser default.
Though I hoped that there exists some header that I dont know about.