ReadonlyborderThe borderBoxSize read-only property of the ResizeObserverEntry interface returns an array containing the new border box size of the observed element when the callback is run.
ReadonlycontentThe contentBoxSize read-only property of the ResizeObserverEntry interface returns an array containing the new content box size of the observed element when the callback is run.
ReadonlycontentThe contentRect read-only property of the object containing the new size of the observed element when the callback is run.
ReadonlydeviceThe devicePixelContentBoxSize read-only property of the ResizeObserverEntry interface returns an array containing the size in device pixels of the observed element when the callback is run.
ReadonlytargetThe target read-only property of the An Element or SVGElement representing the element being observed.
The
ResizeObserverEntryinterface represents the object passed to the ResizeObserver.ResizeObserver constructor's callback function, which allows you to access the new dimensions of the Element or SVGElement being observed.MDN Reference