It is possible to have infinite scrolling pages inside an overflow element.
First define a container element.
<div id="scroller"><div class="item">Item 1</div><div class="item">Item 2</div><!-- more items --></div>
Then configure the overflow using css. Don't forget to give the element a fixed height.
#scroller {overflow: scroll;height: 200px;}
Then configure the element as scroll container.
let ias = new InfiniteAjaxScroll('#scroller', {scrollContainer: '#scroller'});