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Defer loading of non-critical CSS using XHR
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| <html> | |
| <head> | |
| <style> | |
| .blue{color:blue;} | |
| </style> | |
| </head> | |
| <body> | |
| <div class="blue"> | |
| Hello, world! | |
| </div> | |
| <script type="text/javascript" async> | |
| function loadXMLDoc() { | |
| var xmlhttp, css, | |
| head = document.head || document.getElementsByTagName('head')[0], | |
| style = document.createElement('style'); | |
| style.type = 'text/css'; | |
| if (window.XMLHttpRequest) | |
| {// code for IE7+, Firefox, Chrome, Opera, Safari | |
| xmlhttp=new XMLHttpRequest(); | |
| } | |
| else | |
| {// code for IE6, IE5 | |
| xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); | |
| } | |
| xmlhttp.onreadystatechange=function() | |
| { | |
| if (xmlhttp.readyState==4 && xmlhttp.status==200) | |
| { | |
| css=xmlhttp.responseText; | |
| style.appendChild(document.createTextNode(css)); | |
| head.appendChild(style); | |
| } | |
| } | |
| xmlhttp.open("GET","css/mycssfile.css",true); | |
| xmlhttp.send(); | |
| } | |
| window.onload = loadXMLDoc; | |
| </script> | |
| </body> | |
| </html> |
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