How to pronounce “possessive pronoun” in English

Because the "its" pronoun was first introduced in English in the 17th century to replace the earlier pronoun "his," which, rather unhelpfully, overlappedwith the masculine possessive pronoun, also "his." And because it was formed by taking the subject pronoun "it" and adding the S genitive singular ending,the new pronoun was indeed initially written I-T- apostrophe S for the possessive, just as it is here in the first folio of Shakespeare