> Vivaldi 5.6 which uses Chromium 108

Yes, that's right. I thought I'd try it in that older browser that I still happen to have installed, as the user above didn't immediately let us know what that mobile browser was. It may or may not help by at least giving you a browser version you can use to test. As I mentioned somewhere else, it makes sense to use some sort of older browser as a proxy for older browsers in general, when testing.

Developers are always looking for new ways to do what we've always done, often using more technically complicated ways to recreate the simplest things. It's fun from the puzzle-solving point of view, but your choice of earliest browsers you want to support depends on your user base.