optimization - preload css #optimization

preload-css.html

<link rel="preload" href="stylesheets/site-all.min.css" as="style" onload="this.rel='stylesheet'">
<noscript>
	<link type="text/css" media="screen" rel="stylesheet" href="stylesheets/site-all.min.css" />
</noscript>
<script type="text/javascript">
	/*! loadCSS. [c]2017 Filament Group, Inc. MIT License - https://github.com/filamentgroup/loadCSS */
	(function(w){"use strict";if(!w.loadCSS){w.loadCSS=function(){}}
var rp=loadCSS.relpreload={};rp.support=(function(){var ret;try{ret=w.document.createElement("link").relList.supports("preload")}catch(e){ret=!1}
return function(){return ret}})();rp.bindMediaToggle=function(link){var finalMedia=link.media||"all";function enableStylesheet(){link.media=finalMedia}
if(link.addEventListener){link.addEventListener("load",enableStylesheet)}else if(link.attachEvent){link.attachEvent("onload",enableStylesheet)}
setTimeout(function(){link.rel="stylesheet";link.media="only x"});setTimeout(enableStylesheet,3000)};rp.poly=function(){if(rp.support()){return}
var links=w.document.getElementsByTagName("link");for(var i=0;i<links.length;i++){var link=links[i];if(link.rel==="preload"&&link.getAttribute("as")==="style"&&!link.getAttribute("data-loadcss")){link.setAttribute("data-loadcss",!0);rp.bindMediaToggle(link)}}};if(!rp.support()){rp.poly();var run=w.setInterval(rp.poly,500);if(w.addEventListener){w.addEventListener("load",function(){rp.poly();w.clearInterval(run)})}else if(w.attachEvent){w.attachEvent("onload",function(){rp.poly();w.clearInterval(run)})}}
if(typeof exports!=="undefined"){exports.loadCSS=loadCSS}
else{w.loadCSS=loadCSS}}(typeof global!=="undefined"?global:this))
</script>