PerformanceElementTiming: intersectionRect property

{{APIRef("Performance API")}}{{SeeCompatTable}}

The intersectionRect read-only property of the {{domxref("PerformanceElementTiming")}} interface returns the rectangle of the element within the viewport.

Value

A {{domxref("DOMRectReadOnly")}} which is the rectangle of the element within the viewport.

For display images this is the display rectangle of the image within the viewport. For text this is the display rectangle of the node in the viewport. This being the smallest rectangle that contains the union of all text nodes that belong to the element.

Examples

Logging intersectionRect

In this example an {{HTMLElement("img")}} element is being observed by adding the elementtiming attribute. A {{domxref("PerformanceObserver")}} is registered to get all performance entries of type "element" and the buffered flag is used to access data from before observer creation. Calling entry.intersectionRect returns a {{domxref("DOMRectReadOnly")}} object with the display rectangle of the image.

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    if (entry.identifier === "big-image") {
      console.log(entry.intersectionRect);
    }
  });
});
observer.observe({ type: "element", buffered: true });

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}