ResizeObserverCallback typedef
ResizeObserverCallback =
void Function(Element element, num x, num y, num width, num height, num top, num bottom, num left, num right)
A callback for ResizeObserver must conform to this signature
Implementation
typedef ResizeObserverCallback = void Function(Element element, num x, num y,
num width, num height, num top, num bottom, num left, num right);