Is it possible to create a Fake Pop-up Message?

[ProfessorCreepyPasta]

I'm wondering is it possible (with a script/plugin) to make a pop-up/error message that you can click "OK" with the mouse, similar to some Creepypasta/horror games out there. I don't know how to code at all for JavaScript or anything for that matter, so some pointers would be much appreciated. Also, I know this is very similar to another person's post from like 3 years ago but I never got an answer because they said they figured it out without showing their solution.

Thanks,
ProfessorCreepyPasta

 

[Rubescen]

I'm not quite sure if this is what you are looking for, but in a script call:

window.alert('text')

 

[ProfessorCreepyPasta]

I'm not quite sure if this is what you are looking for, but in a script call:

window.alert('text')

Yes! Perfect, thank you!