Definition
Resize Observer defines ResizeObserverEntry
[Exposed=Window]
interface ResizeObserverEntry {
readonly attribute Element target;
readonly attribute DOMRectReadOnly contentRect;
readonly attribute FrozenArray<ResizeObserverSize> borderBoxSize;
readonly attribute FrozenArray<ResizeObserverSize> contentBoxSize;
readonly attribute FrozenArray<ResizeObserverSize> devicePixelContentBoxSize;
};