I meant this documentation: https://docs.codewars.com/training/troubleshooting/

have you checked out the error message?

abcdefghijklmopqrstuvwxyz is not a pangram (n missing): expected true to equal false

because it tells you

• the n is missing
• returning true fails that test

perhaps you could try implementing this test in Chrome and see what happens

Your code not working is not an (= a bug in the kata). Please refer to the documentation (link on left panel).