JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div{
  width: 200px;
  height: 50px;
  border: 1px solid;
  margin-bottom: 10px;
}

JavaScript

function Ob(title){
  this.title = document.createElement("div");
}

var x = new Ob("Заголовок");

document.body.appendChild(x.title).innerHTML="Заголовок";