Validation and get multiple selected values from HTML listbox javascript

Bro can you make a some changes of this code? If we added some questions that sel2the right words. Then what exactly the code was. The result shows that your corrected and wrong words. Can you please do this one? It will be very helpful for me if you do this. Thanks in advance.

How we can add a add button to ListBox which gets the values from another js program to fill in list box

Thanks, exactly what I wanted

how this works without submit?

Thanks for the help!!! it worked :)

Do you have this code on git or somehwere?