Description
The scroll box pattern adds some CSS classes to the element depending on it's scrolling position.
The element where it is invoked upon has to be scrollable.
Therefore the eleme must have set the overflow or overflowY CSS property set to auto or scroll.
Ho(horizontal scrolling is not yet supported.
The classes are:
scroll-up: when scrolling upwards,scroll-down: when scrolling downwards,scroll-position-top: when the scrolling container is scrolled to the top,scroll-position-bottom: when the scrolling container is scrolled to the bottom.