I'm sure that some sites are willingly breaking the back button function. I've never done it intentionally but I've developed a few sites where the back button

I'm sure that some sites are willingly breaking the back button function. I've never done it intentionally but I've developed a few sites where the back button failed to get you back to the previous page. In my case, it was a side effect of a designer's feature that required a javascript library of some kind or a programmatic feature. Once you stray away from W3 standards it is very easy to break the back button on a browser. I've never given it much thought but if I was required to make sure the back button worked I could fix it but I've yet to find a customer that cared enough for me to do it. You see the problem a lot on the web since few sites want to only use the browser standards on their site.