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The possessive ITS, like the possessives *his* and *her*, HAS NO
APOSTROPHE.
The contraction IT'S, with an internal apostrophe, is an informal
version of the words IT IS. ("It's a nice day today.")
There is no such thing as ITS' with an apostrophe following the
word.
These are common errors; seeing the third example more than once in
recent artsednet messages prompts me to send this reminder. (It's
not such a big deal among friends; but do you want your principal to
notice that your usage is not up to standard form?)
-py
To: ARTSEDNET