LayoutShift: sources property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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

The sources read-only property of the LayoutShift interface returns an array of LayoutShiftAttribution objects that indicate the DOM elements that moved during the layout shift.

Value

An Array of LayoutShiftAttribution objects. This array will not contain more than five sources. If there are more than five elements impacted by the layout shift, the five most impactful elements are reported.

Examples

Logging layout shift sources

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    entry.sources.forEach((source) => {
      console.log(source);
    });
  });
});

observer.observe({ type: "layout-shift", buffered: true });