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Very light: only 0.674 kb (LoadCSSJS.min.js: 0.763 kb with copyright notice). Pure vanilla javascript, libraries independent. Can be incorporated into <head> or just before the last </body> tag. Useful for RWD. Tested in IE 5.x and all browsers. For CSS files: split your CSS into 2 files, one for "Above The Fold" included into your HTML document; the second one loaded with this little tool.
CSS links are always included asynchronously into HTML document before all scripts, if present into the head part (for best practices).
Useful in RWD in order to control what you want to serve for each user agents (because even stylesheets are always loaded).
Usage syntax:
/*! Load styles: LoadCSSJS("file", "css", { empty|media: "media properties|all" }) */
/*! Load javascript: LoadCSSJS("file", "js", { empty|defer|asyn: "defer|async"}) */
Note that each loading calls, the one after the other, determines the order of files added into your <head> document part.
Examples:
LoadCSSJS("../css/main.min.css", "css", { rel: "prefetch"});
LoadCSSJS("../js/initial.js", "js", {defer: "defer"});
LoadCSSJS("https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js", "js", {});
LoadCSSJS("../css/fonts-base64.min.css", "css", { rel: "stylesheet", media: "only screen" });
With CSS: Don't forget to add a fallback within your HTML document: i.e.
<noscript><link rel="stylesheet" href="../css/main.min.css"></noscript>
Check the test.html file to see it in action. Online live demo: jsfiddle.net
If you don't need a javascript loader, use the loadcss.min.js very light version of 0.239 kb instead (0.325 kb with copyright notice). Same usage (i.e.: LoadCSS("../css/main.min.css", "only screen");).
Tested successfully in Internet Explorer 5.5 (and above ;) ).
Example:
LoadCSS("../css/main.min.css", "only screen");
Online live demo: jsfiddle.net
We do this because the Google advice doesn't support multiple files (code shown only for US visitors not for others).
Here is an another version of LoadCSSJS with support for browser windows width: jsfiddle.net
