7 ms·Cross browser/backward compatibility, especially IE...by poyu 8y agoCross browser/backward compatibility, especially IE...pavlov 8y agoHow far back do you need to be compatible? I'm pretty sure IE9 had all the necessary APIs, and it was released over seven years ago.rmrfrmrf 8y agoIt's not just about compatibility, it's about implementation bugs. Even IE11 causes our larger apps enormous problems.