JSFiddle - React, Tailwind, and code Playground

HTML

<a id="l2" href="javascript:void(0);">l2_Link</a>

CSS

.selected {
    color: red;
}

JavaScript

window.onload = function (){
    document.getElementById ("l2").addEventListener ("click", change2, false);
}

function change1() {
   document.getElementById("l1").setAttribute("class", "selected");
   document.getElementById("l2").setAttribute("class", "");
}


function change2() {
 //document.getElementById("l1").setAttribute("class", "");
 document.getElementById("l2").setAttribute("class", "selected");

}