Way to make code inactive without having to delete it entirely

Tell us what’s happening:

Your code so far

<!--Hello World-->


<!--Hello Paragraph-->

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Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36.

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