PLEASE don't do this. PLEASE.
PLEASE don't do this. PLEASE.
I get the idea that it would be nice if the web were different, but I think that is a personal responsibility to choose for yourself or try to address yourself by submitting a PR that makes the repo better.
But I understand that ironing out all the issues on all browsers is very resource demanding...
There's no need for the "go use X browser right now" messages unless you're taking advantage of some bleeding edge API that only exists in one place.
To the authors: Personally I wouldn't put too much effort into cross-browser compatibility early on for the sake of satisfying the users of niche software, but ... almost all modern DOM features are available cross-browser/platform these days and it will likely save you a lot of effort further on down the road dealing with deprecated APIs and other headaches to use it as a smoke test for code quality.