This is an advanced user request.

By using the checkbox/radio button elements alongside custom CSS, it's possible to have a range of dynamic stylings for a page. 

For large pages like GBJam we have a lot of information to display, and it would be possible to show tabbed or collapsible information if checkboxes/radio buttons were enabled. It would also allow for checkboxes to show alternate styles of the page for the visually impaired, or a distraction-free version of the page without animations.

The details and summary tags should be available for collapsible information.

At this time we’re unlikely to add form elements to the authorized HTML.

Thanks for this info! I was ignorant of details/summary and I can tie into this with css in the same way. Appreciated.