Returns the smallest bounding rectangle that encompasses this element's padding, scrollbar, and border.
Element.getBoundingClientRect from MDN.
The getBoundingClientRect() method-and-getboundingclientrect()-methods) from W3C.
@DomName('Element.getBoundingClientRect')
@DocsEditable()
Rectangle getBoundingClientRect() => make_dart_rectangle(_blink.BlinkElement.instance.getBoundingClientRect_Callback_0_(unwrap_jso(this)));