JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
Width: <span id="width"></span><br>
Height <span id="height"></span>

JavaScript

$(window).resize(function() {
    $("#width").text($(this).width());
    $("#height").text($(this).height());
});