Preparation for HTML

Hello! In the topic "Preparation for HTML" after the !DOCTYPE html, what is supposed to happen? When I tried it, it was still the blank page that it brought out in the result panel. Is it supposed to be like that?

Could you please post the link to it, so I can take a look?

Once you type:

<!DOCTYPE html>

and nothing else, nothing will happen on the webpage. If you typed under that:

<html>
<p>Hello</p>
</html>

The word Hello would be rendered (shown) on the webpage.