there should be a singular scroll region for a screen on a page
there are multiple scroll regions on a screen which affects the way the screen unholds (or not).
communicate different choices; offer ux based on preference
region area: where are the active regions which has a scroll input
disabled scroll: whether the scroll region enables scrolling or not
proportionality: the proportionality of screen to scroll movement of the scroll region
bounce: the instances of scroll bounce within the scroll region
bounce quantity: the instances of scroll bounce (quantity) within the scroll region
