"type" not documented well enough

[pha3z]

I can't find any other information explaining the Feature "type". All that's said in the Settings UI is this:

You can create "Group title", single "Style rule" or a HTML "Wrapper" of block elements. For example a div wrapper or a blockquote. By default you're creating "Style rules".

I can't figure out what that actually means. Can you add a link to the UI that goes to a wiki page with more thorough explanation of this feature and possibly others?