LayoutShiftAttribution: toJSON() method

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

The toJSON() method of the LayoutShiftAttribution interface is a serializer that returns a JSON representation of the LayoutShiftAttribution object.

Syntax

js
toJSON()

Parameters

None.

Return value

A JSON object that is the serialization of the LayoutShiftAttribution object.

Examples

The following example prints a JSON representation of the first item in LayoutShift.sources to the console.

js
new PerformanceObserver((list) => {
  for (const { sources } of list.getEntries()) {
    if (sources) {
      console.log(sources[0].toJSON());
    }
  }
}).observe({ type: "layout-shift", buffered: true });

Specifications