JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="viewportDimensions">Resize the page</div>

JavaScript

$('#viewportDimensions').text($(window).width() + ', ' + $(window).height());

$(window).resize(function () {
    $('#viewportDimensions').text($(window).width() + ', ' + $(window).height());
});