JSFiddle - React, Tailwind, and code Playground

CSS

div {
    
    width:50px;
    height:50px;
    background-color:red;
    
}

span {

    width:50px;
    height:50px;
    background-color:blue;
    display:inline-block;
    
{

JavaScript

var condition = "test";

if(condition == "test") {
    $("<div></div>").prependTo("body");
} else if (condition == "test2") {
    $("<span></span>").prependTo("body");
}