Looking to take a fixed screenshot at intervals while changing the page in safari for a book

I am trying to screenshot all the pages of a textbook i have online. I am opening the book in safari, all i want is to automate in some way the ability to take a fixed location screenshot at intervals save it to downloads or desktop(wherever) and then have a my cursor click the next page button and retake a screenshot a multitude of times would this be possible in anyway?