Access dimensions and position of the first Element's content + padding + border + margin box in this list.
This returns a rectangle with the dimensions actually available for content
in this element, in pixels, regardless of this element's box-sizing
property. Unlike getBoundingClientRect, the dimensions of this rectangle
will return the same numerical height if the element is hidden or not. This
can be used to retrieve jQuery's outerHeight value for an element.
Source
@Experimental() CssRect get marginEdge;