Look at the packages that makeup Nova for example and you will have to go to the sites and research browser compatibility that would be my guess anyway.
As an example Tailwinds you would have to go to that site.
Anything I program I don't use any packages I use standed regular old CSS.
Seems they have no regard for older browsers,
Where as a company like FedEx maintains a lot further back browser compatibility Remember they have customers all over the world with many older browsers.
You have to remember the majority of people on this forum is only going to use the latest thing.
Thank you @jlrdw - I really appreciate your reply. Definitely a good guess... but this is clearly going to take some time to resolve to a suitable answer. I am surprised no one has asked this before and it doesn't form part of the documentation.
I am personally very much of the opinion that everyone should be using a modern browser, and of course I want to use all the latest and greatest, but at the same time have some obligations to support clients in 'locked in' environments, hence my asking about this.
Anyone else have anything more definitive, or even anecdotal evidence perhaps?