Restrict the use of [size]
This seems more like a social problem than a technical one. Usually a warning not to do it would be enough, and if they continue and ignore your request to stop then they probably need further discipline.
The same applies to other stupid things like this. You can't really prevent it from a technical perspective, but you have the right to ban it.
The same applies to other stupid things like this. You can't really prevent it from a technical perspective, but you have the right to ban it.
No longer involved in the MyBB project.