AddEventListener does not work trite

Question

All browsers work fine, I don’t understand why sl does it. For some reason, the js code was loaded earlier in sl, so I used Window.onload, but still addeventlistener returned null, I tried to run the code later through the event handler, but it still doesn’t work. It starts to anger me that I can't do an easy action. I already think maybe I just don't see any other simple mistake. If so please dont throw tomatoes at me. https://code.sololearn.com/WU0CPb2PtGLI/?ref=app

Answer 1

You have typos
key instead of keg (HTML tab)

xcl instead of xlc (JS tab)

Answer 2

Oh thanks. My attentiveness in the trash