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.

The recent large scale supply chain attack conducted via multiple CDNs, namely Polyfill.io, BootCDN, Bootcss, and Staticfile that affected up to tens of millions of websites has been traced to a ...