The regular repeatable regions work for already existing elements. With the list item you can adjust the repeatable regions to your layout even more freely. It allows for elements to be implemented in the website that weren’t visible before. You can manage those elements via the section tool and insert them into the website.
To use list items you need the data-extra-sub-templates attribute.
First you split the regions into separate subtemplates that you can later select via the section tool. It’s important that you tick the box beside “Section Sub Template” when you create the new template.
The html for a list item will then look like this:
To connect your subtemplate with the original template, insert the following into your template html: