Failing Markdown Previewer h1 tag

Tell us what’s happening:
Hi! I can’t seem to find out why the test doesn’t detect my h1 tags (and probably the other tags) when they are clearly in the Editor box, Preview box, and in the Developer Tools.

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Challenge: Build a Markdown Previewer

Link to the challenge:

I think someone had this kind of problem a few weeks ago. You might want to search it in this forum.