The size
read-only property of the LargestContentfulPaint
interface returns the intrinsic size of the element that is the largest contentful paint.
The size
of the element is the width
times height
of the rectangle
that this element creates on the screen.
An integer representing the width times height of the element.
This example uses a PerformanceObserver
notifying of new largest-contentful-paint
performance entries as they are recorded in the browser's performance timeline. The buffered
option is used to access entries from before the observer creation.
const observer = new PerformanceObserver((list) => {
const entries = list.getEntries();
const lastEntry = entries[entries.length - 1];
console.log(lastEntry.size);
});
observer.observe({ type: "largest-contentful-paint", buffered: true });