An error occurred while saving the commentHaris Kriještorac commented
Taken directly from the Website Grader FAQs page:
Your form will not be read unless it is in the HTML of the page. We don't necessarily believe that this is the only place to put a conversion form in all cases, but HTML is the language most easily readable for search engines. Therefore it is a safe practice to do this.
This tells you how to to get a conversion form read. If you are interested in how to create good conversion forms, I would recommend you check out these slides: