You should know, it looks like that error page actually serves a 200 status code (which means you run the risk of Google crawling and indexing your error pages).
Thats not a real error page - its just a test showing the script tag implemented and loading the error page properly.
Why the dependency on jQuery, if all you're doing is loading html? That's not hard to do with native js at all.
It looks nice, and it works, don't get me wrong. I like jQuery. Just seems unnecessary here.
this is great! really easy to use and implement!
thanks, here to answer any questions if you have any!