Modern Asynchronous CSS Loading Posted by Scott Jehl 11/30/2017 The simplest way to load a CSS file in an HTML document is to use a link element with rel="stylesheet": <link rel="stylesheet" href="mycssfile.css"> Referencing CSS this way works great, but it comes with a downside: it’s synchronous. In other words, with a typical stylesheet link like this, the browser stops rendering subsequent port