LoadCSS.js

LoadCSS.js

// http://www.gotknowhow.com/articles/how-to-asynchronously-load-font-awesome-css-file
<script>
  // Asynchronously load non-critical css 
  function loadCSS(e, t, n) { "use strict"; var i = window.document.createElement("link"); var o = t || window.document.getElementsByTagName("script")[0]; i.rel = "stylesheet"; i.href = e; i.media = "only x"; o.parentNode.insertBefore(i, o); setTimeout(function () { i.media = n || "all" }) }
  // load css file async
  loadCSS("//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css");
</script>

// load css file async
loadCSS("/css/my-test.css");