Visit any infinite scrolling site and click on the link associated with an item in the list. Hit the back button. Q: Where are you in the list now? A: It is

Visit any infinite scrolling site and click on the link associated with an item in the list. Hit the back button. Q: Where are you in the list now? A: It is impossible to know because no two sites behave the same way. You will not be anywhere near the item you clicked on in the majority of cases.