top()/bottom()/left()/right() lacks multiplier on offset amount

[winstondu]

CSS has the ability to allow proportional margin and padding:
https://webplatform.github.io/docs/guides/the_css_layout_model/#Proportional-margins-and-padding-in-the-W3C-box-model

I was wondering if it is possible to implement a similar concept with edges. For example, if I wanted my top margin of a subview to its superview to be 20% of the superview height (i.e. subview.top = superview.top + 0.2*superview.height), how would I accomplish that?

Currently, using the multiplierparameters in width()/height() and centerX()/centerY() works, but there has to be support for the alternate form.

[roberthein]

Interesting idea @winstondu! Thanks! How would you expect the api to look like? And would you be able to setup a PR for this?