Twenty years after its introduction, the jQuery team has released version 4.0.0. The first major release in almost 10 years ...

With jQuery 4, a new major version is released for the first time in years. Less legacy, modern browsers, more security – ...

And the slim build has gotten smaller in jQuery 4.0, with the removal of defaults and callbacks. The jQuery 4.0 beta was unveiled February 6. The full changelog for the release can be found on GitHub.

I'm trying to implement fallback.js in a webapp me and my team are writing but bounced upon some issues. Loading over CDN works fine and falling back to local .js files when CDN is offline works too.