[Megamente]

Can you make a tutorial on how to run or execute that? I have no idea sorry

Sure!

First, copy all the content of the given code. Open a text editor (notepad for example) and paste it there.

save it as mypage.html (all files type) , anywhere you like. Then just execute the file, its a web page. Make sure javascript is enabled in your browser so the code can work


Let me know if this helps!