Trait ResizeObserverEntryMethods 
Source pub trait ResizeObserverEntryMethods<D>{
    // Required methods
    fn Target(&self) -> Root<Dom<<D as DomTypes>::Element>>;
    fn ContentRect(&self) -> Root<Dom<<D as DomTypes>::DOMRectReadOnly>>;
    fn BorderBoxSize(
        &self,
        cx: JSContext,
        _can_gc: CanGc,
        retval: MutableHandle<'_, Value>,
    );
    fn ContentBoxSize(
        &self,
        cx: JSContext,
        _can_gc: CanGc,
        retval: MutableHandle<'_, Value>,
    );
    fn DevicePixelContentBoxSize(
        &self,
        cx: JSContext,
        _can_gc: CanGc,
        retval: MutableHandle<'_, Value>,
    );
}