When generating a new theme, the default IS setup doesn't load new posts, either in scroll or scroll-to-click style. When you click on the button, no new posts are added to the page (in source or visibly) and the button disappears.
See it in (in)action:
The first theme is a "base theme" generated with the pattern library; the second theme is an _s theme generated by underscores.me.
I initially discovered this using the "business" type, but I tested with other types & it seems consistent across the different types.
When generating a new theme, the default IS setup doesn't load new posts, either in scroll or scroll-to-click style. When you click on the button, no new posts are added to the page (in source or visibly) and the button disappears.
See it in (in)action:
The first theme is a "base theme" generated with the pattern library; the second theme is an _s theme generated by underscores.me.
I initially discovered this using the "business" type, but I tested with other types & it seems consistent across the different types.