Data URIs and automation with CSSEmbed and Ant 3

cssembed-ant-3.html

<script>
(function() {
  function addStylesheet(dataUriHref, fallbackHref) {
    var img = new Image();   
    img.onload = img.onerror = function() {   
      
      var link = window.document.createElement("link");      
      link.type = "text/css";
      link.rel = "stylesheet";
      link.href = this.width !== 1 ? fallbackHref : dataUriHref;
     
      var head = document.getElementsByTagName("head")[0] || document.documentElement;
      head.insertBefore(link, head.firstChild);
    };
    img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
  }
  addStylesheet("/css/site-datauri.css", "/css/site-mhtml.css");
})();
</script>
<noscript>
  <link type="text/css" rel="stylesheet" href="/css/site.css" />
</noscript>