.js

var snapbackCache = SnapbackCache({
  bodySelector: "mandatory selector of your infinite feed",
  finish: function () {
    optional method of something that needs to finish on your page before caching the page
  },
  removeAutofocus: function () {
    optional method to kill autofocusing which screws with scrolling the page 
  },
  refreshItems: function (dirtyThings) {
    optional method to fetch fresh bits from your server you want to replace in the cache
  },  
  nextPageOffset: function () {
   optional method to fetch the current page your scrolled to. this is so you can track what page you should scroll next. see the page-cache:loaded event. 
  }
});