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Let’s see if I can explain. type I do not want the browser to save information from my site because I change the images almost all day there when you enter the site continues as before. then I have to get into all the computers clean the navigation data. Can you do it in the code so that the browser does not save the information ? Grateful from now on.
As already commented, this is because your page server is keeping cache of static objects (probably apache) disable this, it will slow the loading of pages, Ctrl+F5 should solve.
– Intruso