Hmm. Something more specific? I assume evergreen browser support means - Chrome, Firefox, Safari, Opera, IE, but which versions. What about mobile OS ?

The whole point of "evergreen browsers" is that the version number doesn't matter.

I totally agree for Chrome, Safari ..., but IE isn't one of those. At least I think it's a little bit disturbing if I can't find browser support list on any new frontend framework that pops out, even if Mozilla is behind it.

I would assume "evergreen IE" means IE9+.

It does not support IE9.