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

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Your code so far


<h1>Hello World</h1>

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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.