How do you make a hover link using CSS that works after the page has been revisited?

Hover works any time, doesn't matter if you go somewhere else and come back.
You use the :hover pseudo-class on the <a> tag - for example;

#nav a {color: blue;}
#nav a:hover{color: red;}

I'm confused and I image the OP will be also.

Why the #nav ? # is a div declaration isn't it? That would make all on the page the same?

The #nav was just an example. It could be a UL with an ID of "nav" or a div with an id of #nav. Either way, specifying the containing element would limit that hover color change to just those inside of #nav.

If you want it to apply to ALL hover links, just leave out the #xxxxx designation.

Also just to clarify # is an ID declaration, not a div declaration.

eg.

<div id="div1">This is div 1</div>
<div id="div2">This is div 2</div>
<div id="div3">This is div 3</div>

/* This selects all three divs */
div {/*style here*/}

/* This selects only the div with ID "div1" */
#div1 {/*style here*/}

Did I say anywhere that # pertained only to divs ???