Event argument in the functions like downbutton and upbutton

#1

what is the usage of this event argument? please clarify.

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#2

also tell me the error in my code

#3

The crossbutton is not working properly

#4

link for my code: https://github.com/Pintu0504/Web-development/blob/main/script.js

#5

The complete link is: https://github.com/Pintu0504/Web-development/tree/main/Crossbutton

#6

What is the error can you be more specific?