/Web APIs

LayoutShift: sources property

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.


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.


Logging layout shift sources

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

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


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
sources 84 84 No No 70 No 84 84 No 60 No 14.0

See also

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