The concept IS called possessive apostrophe and literally until this minute I wasn't aware that "it's" isn't grammatically correct when the "it" in the sentence is being used possessively. I didn't just find an article I thought agreed with me and fire it off, I thought "it's" was valid and riffic didn't know about possessive apostrophes (which again, I had wrong in this case). I didn't look for "it's" in the article because that wasn't up for debate in my mind (again, I can't stress this enough, I was wrong about the usage, any comment I've ever made uses "it's" in this case because that's how I thought it was used), I was just looking for the concept as a whole to link. I got a minor piece wrong and you want to lump me in with everyone who picks the first article that "agrees" with them.