# Resize Observer [component-header:sl-resize-observer] The Resize Observer component offers a thin, declarative interface to the [`ResizeObserver API`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver). The resize observer will report changes to the dimensions of the elements it wraps through the `sl-resize` event. When emitted, a collection of [`ResizeObserverEntry`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserverEntry) objects will be attached to `event.detail` that contains the target element and information about its dimensions. ```html preview