In reply to Matija.

It probably wouldn’t be practical. Some language features can’t be polyfilled, and the effort required to maintain such a plugin would quickly outstrip demand for it.

IE11 is only going to become less prevalent and more broken over time – even Microsoft is actively discouraging anyone from using it, pushing everyone onto Edge. Even if a compatibility effort can be justified now, how much justification will it have in 12 months when IE11 usage is 1/10th of what it is today?