ResizeObserverEntry: contentRect property

{{APIRef("Resize Observer API")}}

The contentRect read-only property of the {{domxref("ResizeObserverEntry")}} interface returns a {{domxref('DOMRectReadOnly')}} object containing the new size of the observed element when the callback is run. Note that this is better supported than {{domxref("ResizeObserverEntry.borderBoxSize")}} or {{domxref("ResizeObserverEntry.contentBoxSize")}}, but it is left over from an earlier implementation of the Resize Observer API, is still included in the spec for web compat reasons, and may be deprecated in future versions.

Value

A {{domxref('DOMRectReadOnly')}} object containing the new size of the element indicated by the {{domxref("ResizeObserverEntry.target", "target")}} property.

If the target is an HTML {{domxref("Element")}}, the returned contentRect is the element's content box. If the target is an {{domxref("SVGElement")}}, the returned contentRect is the SVG's bounding box.

Examples

The following snippet is taken from the resize-observer-text.html (see source) example. This uses a simple feature detection test to see if the browser supports the newer {{domxref("ResizeObserverEntry.contentBoxSize")}} property — if so, it uses that to get the sizing data it needs. If not, it uses contentRect.

const resizeObserver = new ResizeObserver((entries) => {
  for (const entry of entries) {
    if (entry.contentBoxSize) {
      h1Elem.style.fontSize = `${Math.max(
        1.5,
        entry.contentBoxSize.inlineSize / 200,
      )}rem`;
      pElem.style.fontSize = `${Math.max(
        1,
        entry.contentBoxSize.inlineSize / 600,
      )}rem`;
    } else {
      h1Elem.style.fontSize = `${Math.max(
        1.5,
        entry.contentRect.width / 200,
      )}rem`;
      pElem.style.fontSize = `${Math.max(1, entry.contentRect.width / 600)}rem`;
    }
  }
});

resizeObserver.observe(divElem);

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}