I noticed this, as well. AI-generated code? (It's hard to imagine a human setting up that code and forgetting about the very thing they are attempting to demonstrate.)
I thought I was missing something. But then I came looking for confirmation. Does this mean I may have what it takes to make it in webdev?
I noticed the same thing. I believe it's all unintentional omission.
Maybe it's inferred with the built-in Large Language Markup