JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box"></div>

CSS

#box {
    background-color: red;
    width: 100px;
    height: 100px;
    transform: scale(0.7851);
    -ms-transform: scale(0.7851);
    -moz-transform: scale(0.7851);
    -webkit-transform: scale(0.7851);
    -o-transform: scale(0.7851);
}

JavaScript

document.body.appendChild(document.createTextNode("The height after transformation is " + document.getElementById("box").getBoundingClientRect().height + " px."));