chromium/src/third_party/blink/renderer/core/frame/navigator_device_memory.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://github.com/w3c/device-memory#the-web-exposed-api

interface mixin NavigatorDeviceMemory {
    [HighEntropy=Direct,MeasureAs=NavigatorDeviceMemory,SecureContext]
    readonly attribute float deviceMemory;
};