Access the dimensions and position of this element's content + padding + border box.
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.
Important note: use of this method will perform CSS calculations that can trigger a browser reflow. Therefore, use of this property during an animation frame is discouraged. See also: Browser Reflow
CssRect get borderEdge => new _BorderCssRect(this);