Good job on detecting CSS loading failures.

The little-loader also has a section to detect JS loading and errors in IE8/9 (with a dedicated sub-section for the former), I didn't see anything like this in LoadJS... Did you find a terser workaround?

https://github.com/walmartlabs/little-loader/blob/42d233f360...

I'm somewhat familiar with little-loader because I've worked at making it smaller, but I'm not competent to judge whether its approach is necessarily the best...