improvements in bounds

[PuruVJ]

Just collecting some ideas here.

Current bounds have a descriptive API. Usually specifying the element or parent or body is enough. However, the coords API is not good enough. Right now it has a CSS-like model of { top, left, right, bottom }. What if I wanna specify square of [from, to]. Of a specific area. I feel practically top left right bottom is useless unless it can behave exactly like CSS. with percantages, vh, vw, rem, em etc.

Secondly, how do we want to deal with partially overlapping bounds