How To Set Link's "visited" Property/pseudo-class Without Clicking On The Link

I would like to set the link's "visited" pseudo-class with javascript
without clicking on the link. My goal is to update the link's color
(previously set in the CSS file) to be "visited" without actually
clicking on the link and then clicking "back" in the browser.

Does anyone know how? Here are the following things I've already
tried to no avail:

var obj = document.getElementById("idOfMyLink");

//obj.visited=true; // NO
//obj.style.visited=true; // NO
//obj.click(); // NO, performs a click and takes me away from
current page

/*
// Setting the src of an iframe on the same page, trying to
"stuff" this URL into browser's "History"

var theFrame = document.getElementById("myiframe");
theFrame.src = obj.href;

// NO. The iframe does go to correct URL, but the link's color
doesn't update.*/Any ideas?