What does the prop validated on CForm do?

[alinnert]

According to the doc's examples there's a CForm component and it has some props that aren't HTML attributes like validated. Unfortunately, both don't provide an API reference so I don't know what exactly validated does and how and when I should use it.

(Btw. it's not the only place where references are missing. CModalBody, CModalFooter, and CHeaderToggler – just to name a few – are being used in examples but aren't documented at all.)