I already found a big thing: I’m using Linux (Ubuntu 20.04) and I only tested it on Firefox, and now, I tested it on Chromium, and it does the same thing.
So it works on Firefox, but it don’t work on Edge/Chrome/Opera.
I will try to figure it out, why, but I think it’s maybe html and it can be the C++ flags.
And maybe I will try to build it to windows!