JSFiddle - React, Tailwind, and code Playground

by Tan

HTML

<div id="mydiv" class="mydiv">
Get Width of this Container Div
</div>

<div id="mydiv2" class="mydiv2"></div>

CSS

.mydiv {background-color:#999;}
.mydiv2 {background-color:#fff;}

JavaScript

function getwidth() {

var var1 = document.getElementById("mydiv").clientWidth;

document.getElementById("mydiv2").innerText = var1 + "px";

}

window.onresize = getwidth;