The original bare-bones version of LoadJS was down to 455 bytes and grew to 710 as we added some useful features (e.g. CSS loading, async false support, load retries).

Initially I was hesitant to add CSS support because handling load errors across browsers is very tricky but I think we came up with a good solution [1] that is tested down to IE9 [2].

[1] https://github.com/muicss/loadjs/blob/master/src/loadjs.js#L...

[2] https://github.com/muicss/loadjs/blob/master/test/tests.js#L...