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LargestContentfulPaint: id property

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

The id read-only property of the LargestContentfulPaint interface returns the ID of the element that is the largest contentful paint.

Value

A string containing the ID of the element, or the empty string if there is no such ID.

Examples

Logging the largest contentful paint element ID

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.id);
});
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
id 77 79 No No 64 No 77 77 No 55 No 12.0

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https://developer.mozilla.org/en-US/docs/Web/API/LargestContentfulPaint/id