As other people have already stated in the past, safari is the new Internet explorer with its quirks. A feature that works on chrome/edge/chromium and Firefox does not work with safari. If only all browsers could build on one baseline of code as rendering engine and build their stuff on top...
Guess there is always a reason not to.

I hope that NEVER happens. If everyone used one base, it WOULD be Chrome and it would be massaged in such a way as to block the usage for any ad blockers and user scripts.

As dodgy as Mozilla is now (I use Librewolf, the privacy aware fork of Firefox, because it's 2025 and everything is that terrible), I'm glad there are still at least three major engines (Mozilla's Gecko, Safari's WebKit, Chrome's Blink/Chromium).

I've compiled a few early builds of Ladybird and hope they really take off. We need more browser rendering choices, not fewer.