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This is a try to make a vanilla js version.
I had to put your loader on a site that didn't use jQuery, and because the code was ready, i decided to send this PR.
I don't know if you will like this, the code its a bit ugly.
Anyway, tested in Chrome, Firefox and Opera.
And this suppose to work in IE 9+
The API is the same. The only difference is the way you call the main method: