most html elements work best when using the right widgets.
there is an html widget, but im not sure how you would go about connected selected inputs back into mendix.
The strength and added value of the platform lies in the fact that you don’t have to write code for every single element bur rather take advantage of the visual modeling possibilities and (app store) widgets. There are possibilities to do so, but this is hard on your application maintainability.
I’d suggest going through some Academy e-learnings to learn about how to use the platform :)
If you have any specific questions, feel free to ask them!
For an example of a Mendix app that creates dynamic pages based on database contents, you could have a look at the Questionnaire Module. This may give you some ideas how to get started.