JSFiddle - React, Tailwind, and code Playground

by j08691

HTML

<div id="foo" onClick="getWidth()">Hello World</div>

CSS

#foo {
    background: green;
    width: 80px;
}

JavaScript

function getWidth() {
    var elem = document.getElementById("foo");
    var theCSSprop = window.getComputedStyle(elem, null).getPropertyValue("width");
    alert(theCSSprop);
}