User blog comment:Deshiba/Pre-Season Theor Craft: Twitch/@comment-4022742-20131220110126

So I've done some testing, both, and  do not apply. It has to be non true damage originating from non-passive abilities, DoT's of any kind apply it, and so do on-hit effect. So gets 1 stack off the initial Auto Attack bonus, and then subsequent stacks on the DoT, which also refreshes the duration.

The difference here is that, and  do not apply. But, and  do.