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JavaScript JavaScript and the DOM (Retiring) Traversing the DOM Getting the First and Last Child

Hi,pls. could some one check my code to see if this is the behavior needed for the second part of the video?

https://w.trhou.se/mh4lq093io

even though the buttons come off if they are the firstlist item or the last list item, when you add a new list item it does not accept the same behavior. how can I improve it?