Some Questions (@ Riot)

The information I'm about to request are things I've long been confused about. These are questions that I have found to have unsatisfactory answers due to an unclear wording, an outdated source, or conflicting answers are provided with no conclusion.

1. Do innate passives count as spells? For the purposes of etc. I know 's passive applies as a spell, but I am throughly confused for champions like who apply it much differently. What about item damage?
2. Are on-hit activated abilities considered to be AA and/or ability damage? for example Although it's obvious when they don't proc spell-effect items, there is still confusion, as some abilities are treated as basic attacks. is one of the few I am sure about, as her Righteous Fury has been tested to be two separate effects, initially on-hit and the splash treated as a spell.
3. Does lifesteal benefit on-hit effects that aren't basic attack physical damage? for example This is particularly frustrating, with how appears to be bugged in this case, and there are rumors I've heard about abilities like 's and 's [Q]s being treated as basic attacks as well as spells.

I would very much appreciate an official response. Also, don't mind the fact that I've placed this in the Gameplay & Balance section, I thought it best to be placed here as these are questions relating to gameplay, and not things like client issues or building questions.