Exporting variables to HTML file

During my course, the user is prompted to enter answers to questions which are stored in variables.  At the end of the course, I'd like the user to have the option to save their answers as an HTML file.  I would like to generate the HTML page from a JavaScript trigger so that no modifications of the published files are required.

I thought I had found a solution - I can generate an HTML page which displays the variables, but I can not open a Save As dialogue.

I can open a print dialogue and save as PDF from there, but I need it as an HTML file. 

Any suggestions for what seems like a very basic task?  Thanks!