A Conditional Script Loader – yepnope.js
yepnope.js is a lightweight script loader (LABjs-powered) to help use feature detection for loading exactly the scripts (can load CSS or JS files) that your user needs.
With the help of a wait! function, it can wait until the mentioned script loads completely and loads the rest after that.
Although browser-specific code is a bad practice, it can be necessary and yepnope.js has a powerful detection for IE versions (new rules can be added).
Also, a global filters feature helps applying page-wide JavaScript customizations (an auto-protocol filter is already included which makes all links work on both http and https connections).
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