Javascript: one function to check individual checkboxes in the same group, and store the answer individually

I am very new to js, and I have been searching for this answer for days. I have a little personal project I'm working on, and it includes checkboxes.

I have a function that is supposed to help generate code to copy/paste/save as a new html. Since I'm new to js I am having problems getting the verification of the checkboxes to work properly, and to have it check each checkbox one at a time (not as a group/array), then to save the value to apply it to the function that generates the code. I have this JS Bin for you to view.

I know there is a better way to get it to do the code, and I can't seem to get what I do have to generate properly. I keep seeing the code when I press the 'Get Code' button instead of the checkmark I want to see.

I am somewhat good (not great) at html and css only.

I would appreciate any help you can offer.