JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="tabs">
    <li><a href="#" rel="div1">Test 1</a></li>
    <li><a href="#" rel="div2">Test 2</a></li>
    <li><a href="#" rel="div3">Test 3</a></li>
</ul>

<div id="panel_wrapper">
    <div id="div1" class="panel">div 1</div>
    <div id="div2" class="panel">div 2</div>
    <div id="div3" class="panel">div 3</div>
</div>

CSS

#panel_wrapper>div{
    padding:10px;
    width:200px;
    height:200px;
    margin: 20px 0;
    text-align: center;
    vertical-align: middle;
    line-height: 200px;
    border:1px solid black;
    display: none;
}

JavaScript

$("#tabs a").click(function (e) {
    e.preventDefault(); //preprecimo izvajanje default obnasanja
    $("#panel_wrapper div.panel").hide(); //skrijemo vse s classom "panel"
    var rel = $(this).attr('rel'); //dobimo ven rel vrednost
    $("#panel_wrapper div#"+rel).show(); //prikazemu ustrezni panel
});


$("#tabs a:eq(0)").trigger("click");