chromium/src/third_party/blink/renderer/core/timing/layout_shift.idl

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// https://wicg.github.io/layout-instability/#sec-layout-shift
[Exposed=Window]
interface LayoutShift : PerformanceEntry {
    readonly attribute double value;
    readonly attribute boolean hadRecentInput;
    readonly attribute DOMHighResTimeStamp lastInputTime;
    [SameObject, SaveSameObject] readonly attribute FrozenArray<LayoutShiftAttribution> sources;

    [CallWith=ScriptState, ImplementedAs=toJSONForBinding] object toJSON();
};