The "js-load_more" link takes a few parameters:
href
The page to load from – should work normally if JS is turned off or user opens in a new tab.
data-target
Selector for the list container to be updated. (usually a "ul" or "ol")
data-source (optional)
Selector for the list container from which to get the new items. (by default equals the data-target)
data-update (optional)
A comma separated list of selectors of elements to be updated with the loaded page. Usually this is the "load more" link itself, because it will point to another page.
data-prevent-load (optional)
Boolean value. Set it to "true" to prevent the JS from handling the load (doing the ajax call). Instead listen for "load.load_more" Event and handle the ajax-call by yourself.