As a developer you need to know which browsers are used by Dynamic 365 Users in your organization. The reason for this is quite simple, it will dictate your way of programming when it comes to scripting. Most browsers majority of the time react the same way to JavaScript giving you a more predictable outcome, when it comes to IE 11 you have to be more careful, even though JavaScript has evolved since ECMAScript 5 IE 11 still using ECMAScript 5 and I am sure you have a handful of users that are on IE 11 in your organization. ECMAScript 5 has so many limitation, yes you can use application like Babel to convert your code to ECMAScript 5 while coding with the latest version, if you have seen the output of Babel its not that palatable for my taste, it injects code to mitigate the shortcoming of ECMAScript 5, if you work with many developers I don’t think you are inclined to introduce a new process to generate your JavaScript files. There are few things you can do Short term solu