JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
    </head>
    <body>
        <div class="css_load_catcher"></div>
        <div class="css_load_time"></div>
    </body>
</html>

CSS

.css_load_time             
{                 
    font-size: 30px;                 
    text-align: left;                
    background: transparent;             
}

JavaScript

InnerCallback = function(link, callback)
            {
                $('.css_load_time').html((new Date().getTime() - link._loadStart) + 'ms');
                callback(link);
            }
            
            LoadCss = function(url, callback)
            {
                var link = document.createElement('link');

                link.rel   = 'stylesheet';
                link.type  = 'text/css';
                link.href  = url;
                link._rawUrl = url;
                
                if ($.browser.msie || $.browser.opera)
                {
                    link.onload = function()
                    {
                        InnerCallback(link, callback);
                    }
                }
                else if ($.browser.mozilla)
                {
                    $('.css_load_catcher').bind('animationstart', function()
                    {
                        InnerCallback(link, callback);
                    });
                }
                else if ($.browser.webkit)
                {
                    $('.css_load_catcher').bind('webkitAnimationStart', function()
                    {
                        InnerCallback(link, callback);
                    });                
                }
                
                link._loadStart = new Date().getTime();
                $('head')[0].appendChild(link);                
            }
            
            $(document).ready(function()
            {
                LoadCss('https://dl.dropbox.com/s/hzot90l848gihof/css_load_test.css?dl=1', function(link)
                {
                    console.log(link, ' successefully loaded');
                });
            });