preserve unlimited pagination after entering it's item

I'm looking for solution to keep previously loaded items (a lot of items) in pagination which is like "LOAD MORE ELEMENTS" (accumulated feed). Entering some item in this list will not return me back to this big bunch of items back.

I've seen a lot of sites, which implement this, but can't reverse engineer it ( due to lack of frontend skills.

What is the key feature of solving this problem? (angular or jquery way).