How to get browsers recognise visited links on the form <url>#<anchor>

I have a page whith links of the form <url>?<parameters> and some of the form <url>?<parameters>#<anchor>. There are several different of the latter but one example that can easily be understood looks like this (about):

<a href="http://www.mu_site.com/forum.php?forum=1&thread=1#p5">My forum #1: Tread 1, go to post 5</a>

Now I have these styles attached to the page

    .pageContent {
        FONT-SIZE: 8pt;
        COLOR: #666666;
        FONT-FAMILY: Tahoma, sans-serif;
        text-align: left;
    }
    .pageContent A {
        FONT-SIZE: 8pt; COLOR: #8d8d8d; FONT-FAMILY: Tahoma, sans-serif;
    }
    .pageContent A:hover {
        COLOR: #000000;
    }
    .pageContent A:visited {
        COLOR: #660000;
    }
    

What puzzles me is that my links of the latter form doesn't get marked as visited. I've experimented with different DOCTYPE settings but I can't get it to work. I've searced the net many times (I've had this problem for more than a year) but either I don't know what to search for or it only happens to me.