W3cubDocs

/Web APIs

LargestContentfulPaint: size property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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.

Value

An integer representing the width times height of the element.

Examples

Logging the size of the largest contentful paint 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.

js

const observer = new PerformanceObserver((list) => {
  const entries = list.getEntries();
  const lastEntry = entries[entries.length - 1]; // Use the latest LCP candidate
  console.log(lastEntry.size);
});
observer.observe({ type: "largest-contentful-paint", buffered: true });

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
size 77 79 No No 64 No 77 77 No 55 No 12.0

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/LargestContentfulPaint/size