For what it's worth:
"A very common mistake is to write its (the possessive form of it ) when it's (the short form of it is or it has ) is required: It's [it is] unclear what he meant. It's [it has] been wonderful seeing you again. But do not use it's for it has when has is the main verb: It has a strong flavor; use it sparingly cannot be written as It's a strong flavor… An equally common mistake is to use it's for the possessive, probably because ordinary possessives of nouns are formed with an apostrophe: the dog's coat; Mary's cell phone. But the possessive its is a pronoun, not a noun, and, like other possessive pronouns ( his, hers, yours, and theirs ), is written without that particular bit of punctuation: I have to fix my bike. Its front wheel came off.
While it is possible to use its as a predicate adjective ( The cat is angry because the bowl you're eating out of is its! ) or as a pronoun meaning “that or those belonging to it” ( Your notebook pages are torn. Borrow my notebook—its aren't ), such use is rare and in most circumstances strained. See also me.
