CSS delivery optimization: How to defer css loading?
I am trying to optimize the CSS delivery following the google documentation for developers https://developers.google.com/speed/docs/insights/OptimizeCSSDelivery#example
As you can see in the example of inlining a small CSS file the critical CSS in inlined in the head and the original small.css is loaded after onload of the page.
<html>
<head>
<style>
.blue{color:blue;}
</style>
</head>
<body>
<div class="blue">
Hello, world!
</div>
</body>
</html>
<noscript><link rel="stylesheet" href="small.css"></noscript>
My question regarding this example:
How to load a large css file after onload of the page?
Answer
If you don't mind using jQuery, here is a simple code snippet to help you out. (Otherwise comment and I'll write a pure-js example
function loadStyleSheet(src) {
if (document.createStyleSheet){
document.createStyleSheet(src);
}
else {
$("head").append($("<link rel='stylesheet' href='"+src+" />"));
}
};
Just call this in your $(document).ready() or window.onload function and you're good to go.
For #2, why don't you try it out? Disable Javascript in your browser and see!
By the way, it's amazing how far a simple google search can get you; for the query "post load css", this was the fourth hit...
http://www.vidalquevedo.com/how-to-load-css-stylesheets-dynamically-with-jquery