Hello @ulim
As you probably already know, Safari was once really lagging behind modern web technologies, so they have made a lot of changes with each version, bringing it in line with the others. Sadly, it is not possible to support Safari 14, as it lacks a lot of the foundations that are currently used in today’s web. Plus, Safari 14 came out in 2020 which would make it 5 years old in a few months.
I’m really sorry, but as that version is quite limited, we will not be able to implement support for it. It would be recommended to upgrade your browser and OS to the latest version, as you will not only get the latest features but security fixes as well. 🙂
Thanks.