Source/core/css/navigationTransitions.css

/*
 * Copyright 2014 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.
 */

body {
  animation-duration: 300ms;
  transition-duration: 300ms;

  /* Prevent user interaction. */
  pointer-events: none !important;
}