Its is its own possessive.
Dont need no apostrophe nohow.
I dont agree with that, but that's the way it's.
I seem to vaguely recall using a typewriter that didn't have a "one" or an exclamation point key. You typed a lower case "ell" for the "one," and a period-backspace-apostrophe for the exclamation point. It may have been my mother's, from wayback when. Those were the days when the ribbons were two-colored, red and black. There was a key to kick the ribbon carrier up higher to strike a red letter.