I'm creating a custom Zendesk theme and notice in the stock Copenhagen theme the validate helper is used, namely a few instances of {{#validate 'body'}}value{{/validate}} in the request_page file. Are all of these instances of the helper required? What is being validated in the body and where?

As a test to see what is "valid" in the reply body, I've tried including some HTML markup, but nothing seemed to change. I'm not really sure how to test if the helper is working if I don't know how it works. Can someone elaborate? I hope I am being clear.