Most of these didn't work on Firefox either or fail gracefully, so no cross-browser support. I'd say that the more "stuff" you need to do on a web app, the mor

Most of these didn't work on Firefox either or fail gracefully, so no cross-browser support. I'd say that the more "stuff" you need to do on a web app, the more likely those features will need to be cross-browser compatible, and having done that in the past, I can say that VanillaJS is a fine thing for simple straightforward web apps, but when you start needing more features, it can be a load-off to outsource it to a framework. If you understand what the framework is doing, used sparingly, some frameworks can save you some time. JS libraries have the same deal, there are some features that I would prefer not rewrite every time I write an app. For instance, PDF.js is quite indispensable at reading PDFs in the browser and I think someone would spend quite a bit of time re-writing all the features you need from that library. Anyways, I guess it just all comes down to using the right tool for the job.