Not to mention, you can do this on literally ANY
site with text areas with the latest browsers.
This isn't a site issue. This is a client side effect of them messing around with HTML/elements. There is literally nothing we can do on our end except JS/CSS code that prevents you to do so. And that's absolutely pointless to prevent too. No one else is affected, and it goes away as soon as you refresh or go to another page.
So yeah. This isn't happening.
Be a cool person and check out this thread and comment on it!
There's custom dimensions and really neat sorcery you can enjoy!
Scrydan does Datapack things to Minecraft - 1.16 Minecraft Java Datapack Requests
Minecraft Randomizer: Scrycrafter