JSFiddle - React, Tailwind, and code Playground

HTML

<div>Hello</div>

CSS

div {
  width: 100px;
  height: 100px;
  background: #ccc;
  text-align: center; 
  line-height: 100px;    
  -webkit-transform: scale(2);
}

JavaScript

var div = document.getElementsByTagName("div")[0];

console.log("innerWidth: ", div.offsetWidth);
console.log("getBoundingClientRect().width: ", div.getBoundingClientRect().width);