JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1"></div>

CSS

body, html { height: 100%; }
div { width: 200px; height: 50%; display: block; border: 1px #ccc solid; }

JavaScript

$("#div1").height($("#div1").height());
$("#div1").append("Height is :"+$("#div1").height()+"px");