:visited

HTML

<a href="https://www.google.com">google</a><br>

<a id="hyper"href="yahoo.com">yahoo</a><br>

<a href="microsoft.com">microsoft</a><br>

CSS

#hyper:visited{
  
}

a:visited {
  color:
}

JavaScript

var vlinks = document.querySelectorAll(":visited");

for (var i = 0; i < vlinks.length; i++) {
    alert(vlinks[i].href);
}