Why is its possessive form without an apostrophe, when it’s opposite of other English rules and often counter-intuitive?

Question

See this headline: proper usage, but difficult to parse. “It’s” = “it is”, exclusively. The origin of this “exception” rule?

In: 6

Answer 1

“Its” indicating possession without an apostrophe can also be seen in other possessive pronouns (e.g. hers, his, ours, theirs, yours).