How can I output a 'hello world' message on the targeted screen successfully?

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

<h1>Hello World</h1>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0

Challenge: Say Hello to HTML Elements

Link to the challenge:

I have copied your code and it worked in my end. Check if you are running ad block and press Reset All Code button.