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<iframe><html dir="ltr" lang="en"><head>

 <meta charset="utf-8">
  <meta name="theme-color" content="#fff">
  <meta name="viewport" content="width=device-width, initial-scale=1.0,
                                  maximum-scale=1.0, user-scalable=no">
  <title>chrome-extension://invalid/</title>
  <style>/* Copyright 2017 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. */

a {

 color: var(--link-color);

}

body {

 --background-color: #fff;
 --error-code-color: var(--google-gray-700);
 --google-blue-100: rgb(210, 227, 252);
 --google-blue-300: rgb(138, 180, 248);
 --google-blue-600: rgb(26, 115, 232);
 --google-blue-700: rgb(25, 103, 210);
 --google-gray-100: rgb(241, 243, 244);
 --google-gray-300: rgb(218, 220, 224);
 --google-gray-500: rgb(154, 160, 166);
 --google-gray-50: rgb(248, 249, 250);
 --google-gray-600: rgb(128, 134, 139);
 --google-gray-700: rgb(95, 99, 104);
 --google-gray-800: rgb(60, 64, 67);
 --google-gray-900: rgb(32, 33, 36);
 --heading-color: var(--google-gray-900);
 --link-color: rgb(88, 88, 88);
 --popup-container-background-color: rgba(0,0,0,.65);
 --primary-button-fill-color-active: var(--google-blue-700);
 --primary-button-fill-color: var(--google-blue-600);
 --primary-button-text-color: #fff;
 --quiet-background-color: rgb(247, 247, 247);
 --secondary-button-border-color: var(--google-gray-500);
 --secondary-button-fill-color: #fff;
 --secondary-button-hover-border-color: var(--google-gray-600);
 --secondary-button-hover-fill-color: var(--google-gray-50);
 --secondary-button-text-color: var(--google-gray-700);
 --small-link-color: var(--google-gray-700);
 --text-color: var(--google-gray-700);
 background: var(--background-color);
 color: var(--text-color);
 word-wrap: break-word;

}

.nav-wrapper .secondary-button {

 background: var(--secondary-button-fill-color);
 border: 1px solid var(--secondary-button-border-color);
 color: var(--secondary-button-text-color);
 float: none;
 margin: 0;
 padding: 8px 16px;

}

.hidden {

 display: none;

}

html {

 -webkit-text-size-adjust: 100%;
 font-size: 125%;

}

.icon {

 background-repeat: no-repeat;
 background-size: 100%;

}

@media (prefers-color-scheme: dark) {

 body.captive-portal,
 body.dark-mode-available,
 body.neterror,
 body.supervised-user-block,
 .offline body {
   --background-color: var(--google-gray-900);
   --error-code-color: var(--google-gray-500);
   --heading-color: var(--google-gray-500);
   --link-color: var(--google-blue-300);
   --primary-button-fill-color-active: rgb(129, 162, 208);
   --primary-button-fill-color: var(--google-blue-300);
   --primary-button-text-color: var(--google-gray-900);
   --quiet-background-color: var(--background-color);
   --secondary-button-border-color: var(--google-gray-700);
   --secondary-button-fill-color: var(--google-gray-900);
   --secondary-button-hover-fill-color: rgb(48, 51, 57);
   --secondary-button-text-color: var(--google-blue-300);
   --small-link-color: var(--google-blue-300);
   --text-color: var(--google-gray-500);
 }

} </style>

 <style>/* 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. */

button {

 border: 0;
 border-radius: 4px;
 box-sizing: border-box;
 color: var(--primary-button-text-color);
 cursor: pointer;
 float: right;
 font-size: .875em;
 margin: 0;
 padding: 8px 16px;
 transition: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
 user-select: none;

}

[dir='rtl'] button {

 float: left;

}

.bad-clock button, .captive-portal button, .lookalike-url button, .main-frame-blocked button, .neterror button, .offline button, .pdf button, .ssl button, .safe-browsing-billing button {

 background: var(--primary-button-fill-color);

}

button:active {

 background: var(--primary-button-fill-color-active);
 outline: 0;

}

  1. debugging {
 display: inline;
 overflow: auto;

}

.debugging-content {

 line-height: 1em;
 margin-bottom: 0;
 margin-top: 1em;

}

.debugging-content-fixed-width {

 display: block;
 font-family: monospace;
 font-size: 1.2em;
 margin-top: 0.5em;

}

.debugging-title {

 font-weight: bold;

}

  1. details {
 margin: 0 0 50px;

}

  1. details p:not(:first-of-type) {
 margin-top: 20px;

}

.secondary-button:active {

 border-color: white;
 box-shadow: 0 1px 2px 0 rgba(60, 64, 67, .3),
     0 2px 6px 2px rgba(60, 64, 67, .15);

}

.secondary-button:hover {

 background: var(--secondary-button-hover-fill-color);
 border-color: var(--secondary-button-hover-border-color);
 text-decoration: none;

}

.error-code {

 color: var(--error-code-color);
 font-size: .86667em;
 text-transform: uppercase;
 margin-top: 12px;

}

  1. error-debugging-info {
 font-size: 0.8em;

}

h1 {

 color: var(--heading-color);
 font-size: 1.6em;
 font-weight: normal;
 line-height: 1.25em;
 margin-bottom: 16px;

}

h2 {

 font-size: 1.2em;
 font-weight: normal;

}

.icon {

 height: 72px;
 margin: 0 0 40px;
 width: 72px;

}

input[type=checkbox] {

 opacity: 0;

}

input[type=checkbox]:focus ~ .checkbox:after {

 outline: -webkit-focus-ring-color auto 5px;

}

.interstitial-wrapper {

 box-sizing: border-box;
 font-size: 1em;
 line-height: 1.6em;
 margin: 14vh auto 0;
 max-width: 600px;
 width: 100%;

}

  1. main-message > p {
 display: inline;

}

  1. extended-reporting-opt-in {
 font-size: .875em;
 margin-top: 32px;

}

  1. extended-reporting-opt-in label {
 display: grid;
 grid-template-columns: 1.8em 1fr;
 position: relative;

}

.nav-wrapper {

 margin-top: 51px;

}

.nav-wrapper::after {

 clear: both;
 content: ;
 display: table;
 width: 100%;

}

.small-link {

 color: var(--small-link-color);
 font-size: .875em;

}

.checkboxes {

 flex: 0 0 24px;

}

.checkbox {

 --padding: .9em;
 background: transparent;
 display: block;
 height: 1em;
 left: -1em;
 padding-inline-start: var(--padding);
 position: absolute;
 right: 0;
 top: -.5em;
 width: 1em;

}

.checkbox::after {

 border: 1px solid white;
 border-radius: 2px;
 content: ;
 height: 1em;
 position: absolute;
 top: var(--padding);
 left: var(--padding);
 width: 1em;

}

.checkbox::before {

 background: transparent;
 border: 2px solid white;
 border-right-width: 0;
 border-top-width: 0;
 content: ;
 height: .2em;
 left: calc(.3em + var(--padding));
 opacity: 0;
 position: absolute;
 top: calc(.3em  + var(--padding));
 transform: rotate(-45deg);
 width: .5em;

}

input[type=checkbox]:checked ~ .checkbox::before {

 opacity: 1;

}

  1. recurrent-error-message {
 background: #ededed;
 border-radius: 4px;
 padding: 12px 16px;
 margin-top: 12px;
 margin-bottom: 16px;

}

.showing-recurrent-error-message #extended-reporting-opt-in {

 margin-top: 16px;

}

@media (max-width: 700px) {

 .interstitial-wrapper {
   padding: 0 10%;
 }
 #error-debugging-info {
   overflow: auto;
 }

}

@media (max-width: 420px) {

 button,
 [dir='rtl'] button,
 .small-link {
   float: none;
   font-size: .825em;
   font-weight: 500;
   margin: 0;
   width: 100%;
 }
 button {
   padding: 16px 24px;
 }
 #details {
   margin: 20px 0 20px 0;
 }
 #details p:not(:first-of-type) {
   margin-top: 10px;
 }
 .secondary-button:not(.hidden) {
   display: block;
   margin-top: 20px;
   text-align: center;
   width: 100%;
 }
 .interstitial-wrapper {
   padding: 0 5%;
 }
 #extended-reporting-opt-in {
   margin-top: 24px;
 }
 .nav-wrapper {
   margin-top: 30px;
 }

}

/**

* Mobile specific styling.
* Navigation buttons are anchored to the bottom of the screen.
* Details message replaces the top content in its own scrollable area.
*/

@media (max-width: 420px) {

 .nav-wrapper .secondary-button {
   border: 0;
   margin: 16px 0 0;
   margin-inline-end: 0;
   padding-bottom: 16px;
   padding-top: 16px;
 }

}

/* Fixed nav. */ @media (min-width: 240px) and (max-width: 420px) and

      (min-height: 401px),
      (min-width: 421px) and (min-height: 240px) and
      (max-height: 560px) {
 body .nav-wrapper {
   background: var(--background-color);
   bottom: 0;
   box-shadow: 0 -12px 24px var(--background-color);
   left: 0;
   margin: 0 auto;
   max-width: 736px;
   padding-left: 24px;
   padding-right: 24px;
   position: fixed;
   right: 0;
   width: 100%;
   z-index: 2;
 }
 .interstitial-wrapper {
   max-width: 736px;
 }
 #details,
 #main-content {
   padding-bottom: 40px;
 }
 #details {
   padding-top: 5.5vh;
 }
 button.small-link {
   color: var(--google-blue-600);
 }

}

@media (max-width: 420px) and (orientation: portrait),

      (max-height: 560px) {
 body {
   margin: 0 auto;
 }
 button,
 [dir='rtl'] button,
 button.small-link,
 .nav-wrapper .secondary-button {
   font-family: Roboto-Regular,Helvetica;
   font-size: .933em;
   margin: 6px 0;
   transform: translatez(0);
 }
 .nav-wrapper {
   box-sizing: border-box;
   padding-bottom: 8px;
   width: 100%;
 }
 #details {
   box-sizing: border-box;
   height: auto;
   margin: 0;
   opacity: 1;
   transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 #details.hidden,
 #main-content.hidden {
   display: block;
   height: 0;
   opacity: 0;
   overflow: hidden;
   padding-bottom: 0;
   transition: none;
 }
 h1 {
   font-size: 1.5em;
   margin-bottom: 8px;
 }
 .icon {
   margin-bottom: 5.69vh;
 }
 .interstitial-wrapper {
   box-sizing: border-box;
   margin: 7vh auto 12px;
   padding: 0 24px;
   position: relative;
 }
 .interstitial-wrapper p {
   font-size: .95em;
   line-height: 1.61em;
   margin-top: 8px;
 }
 #main-content {
   margin: 0;
   transition: opacity 100ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 .small-link {
   border: 0;
 }
 .suggested-left > #control-buttons,
 .suggested-right > #control-buttons {
   float: none;
   margin: 0;
 }

}

@media (min-width: 421px) and (min-height: 500px) and (max-height: 560px) {

 .interstitial-wrapper {
   margin-top: 10vh;
 }

}

@media (min-height: 400px) and (orientation:portrait) {

 .interstitial-wrapper {
   margin-bottom: 145px;
 }

}

@media (min-height: 299px) {

 .nav-wrapper {
   padding-bottom: 16px;
 }

}

@media (max-height: 560px) and (min-height: 240px) and (orientation:landscape) {

 .extended-reporting-has-checkbox #details {
   padding-bottom: 80px;
 }

}

@media (min-height: 500px) and (max-height: 650px) and (max-width: 414px) and

      (orientation: portrait) {
 .interstitial-wrapper {
   margin-top: 7vh;
 }

}

@media (min-height: 650px) and (max-width: 414px) and (orientation: portrait) {

 .interstitial-wrapper {
   margin-top: 10vh;
 }

}

/* Small mobile screens. No fixed nav. */ @media (max-height: 400px) and (orientation: portrait),

      (max-height: 239px) and (orientation: landscape),
      (max-width: 419px) and (max-height: 399px) {
 .interstitial-wrapper {
   display: flex;
   flex-direction: column;
   margin-bottom: 0;
 }
 #details {
   flex: 1 1 auto;
   order: 0;
 }
 #main-content {
   flex: 1 1 auto;
   order: 0;
 }
 .nav-wrapper {
   flex: 0 1 auto;
   margin-top: 8px;
   order: 1;
   padding-left: 0;
   padding-right: 0;
   position: relative;
   width: 100%;
 }
 button,
 .nav-wrapper .secondary-button {
   padding: 16px 24px;
 }
 button.small-link {
   color: var(--google-blue-600);
 }

}

@media (max-width: 239px) and (orientation: portrait) {

 .nav-wrapper {
   padding-left: 0;
   padding-right: 0;
 }

} </style>

 <style>/* Copyright 2013 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. */

/* Don't use the main frame div when the error is in a subframe. */ html[subframe] #main-frame-error {

 display: none;

}

/* Don't use the subframe error div when the error is in a main frame. */ html:not([subframe]) #sub-frame-error {

 display: none;

}

  1. diagnose-button {
 float: none;
 margin-bottom: 10px;
 margin-inline-start: 0;
 margin-top: 20px;

}

h1 {

 margin-top: 0;
 word-wrap: break-word;

}

h1 span {

 font-weight: 500;

}

h2 {

 color: var(--heading-color);
 font-size: 1.2em;
 font-weight: normal;
 margin: 10px 0;

}

a {

 text-decoration: none;

}

.icon {

 -webkit-user-select: none;
 display: inline-block;

}

.icon-generic {

 /**
  * Can't access chrome://theme/IDR_ERROR_NETWORK_GENERIC from an untrusted
  * renderer process, so embed the resource manually.
  */
 content: -webkit-image-set(
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABIAQMAAABvIyEEAAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAENJREFUeF7tzbEJACEQRNGBLeAasBCza2lLEGx0CxFGG9hBMDDxRy/72O9FMnIFapGylsu1fgoBdkXfUHLrQgdfrlJN1BdYBjQQm3UAAAAASUVORK5CYII=) 1x,
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQAQMAAADdiHD7AAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAFJJREFUeF7t0cENgDAMQ9FwYgxG6WjpaIzCCAxQxVggFuDiCvlLOeRdHR9yzjncHVoq3npu+wQUrUuJHylSTmBaespJyJQoObUeyxDQb3bEm5Au81c0pSCD8HYAAAAASUVORK5CYII=) 2x);

}

.icon-offline {

 content: -webkit-image-set(
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABIAQMAAABvIyEEAAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAGxJREFUeF7tyMEJwkAQRuFf5ipMKxYQiJ3Z2nSwrWwBA0+DQZcdxEOueaePp9+dQZFB7GpUcURSVU66yVNFj6LFICatThZB6r/ko/pbRpUgilY0Cbw5sNmb9txGXUKyuH7eV25x39DtJXUNPQGJtWFV+BT/QAAAAABJRU5ErkJggg==) 1x,
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQBAMAAAAVaP+LAAAAGFBMVEUAAABTU1NNTU1TU1NPT09SUlJSUlJTU1O8B7DEAAAAB3RSTlMAoArVKvVgBuEdKgAAAJ1JREFUeF7t1TEOwyAMQNG0Q6/UE+RMXD9d/tC6womIFSL9P+MnAYOXeTIzMzMzMzMzaz8J9Ri6HoITmuHXhISE8nEh9yxDh55aCEUoTGbbQwjqHwIkRAEiIaG0+0AA9VBMaE89Rogeoww936MQrWdBr4GN/z0IAdQ6nQ/FIpRXDwHcA+JIJcQowQAlFUA0MfQpXLlVQfkzR4igS6ENjknm/wiaGhsAAAAASUVORK5CYII=) 2x);
 position: relative;

}

.icon-disabled {

 content: -webkit-image-set(
     url(data:image/png;base64,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) 1x,
     url(data:image/png;base64,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) 2x);
 width: 112px;

}

.error-code {

 display: block;
 font-size: .8em;

}

  1. content-top {
 margin: 20px;

}

  1. help-box-inner {
 background-color: #f9f9f9;
 border-top: 1px solid #EEE;
 color: #444;
 padding: 20px;
 text-align: start;

}

.hidden {

 display: none;

}

  1. suggestion {
 margin-top: 15px;

}

  1. suggestions-list a {
 color: var(--google-blue-600);

}

  1. suggestions-list p {
 margin-block-end: 0;

}

  1. suggestions-list ul {
 margin-top: 0;

}

.single-suggestion {

 list-style-type: none;
 padding-left: 0;

}

  1. short-suggestion {
 margin-top: 5px;

}

  1. error-information-button {
 content: url(data:image/svg+xml;base64,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);
 height: 24px;
 vertical-align: -.15em;
 width: 24px;

}

.use-popup-container#error-information-popup-container

 #error-information-popup {
 align-items: center;
 background-color: var(--popup-container-background-color);
 display: flex;
 height: 100%;
 left: 0;
 position: fixed;
 top: 0;
 width: 100%;
 z-index: 100;

}

.use-popup-container#error-information-popup-container

 #error-information-popup-content > p {
 margin-bottom: 11px;
 margin-inline-start: 20px;

}

.use-popup-container#error-information-popup-container #suggestions-list ul {

 margin-inline-start: 15px;

}

.use-popup-container#error-information-popup-container

 #error-information-popup-box {
 background-color: var(--background-color);
 left: 5%;
 padding-bottom: 15px;
 padding-top: 15px;
 position: fixed;
 width: 90%;
 z-index: 101;

}

.use-popup-container#error-information-popup-container div.error-code {

 margin-inline-start: 20px;

}

.use-popup-container#error-information-popup-container #suggestions-list p {

 margin-inline-start: 20px;

}

not(.use-popup-container)#error-information-popup-container
 #error-information-popup-close {
 display: none;

}

  1. error-information-popup-close {
 margin-bottom: 0px;
 margin-inline-end: 35px;
 margin-top: 15px;
 text-align: end;

}

.link-button {

 color: rgb(66, 133, 244);
 display: inline-block;
 font-weight: bold;
 text-transform: uppercase;

}

  1. sub-frame-error-details {
 color: #8F8F8F;
 /* Not done on mobile for performance reasons. */
 text-shadow: 0 1px 0 rgba(255,255,255,0.3);

}

[jscontent=hostName], [jscontent=failedUrl] {

 overflow-wrap: break-word;

}

  1. search-container {
 /* Prevents a space between controls. */
 display: flex;
 margin-top: 20px;

}

  1. search-box {
 border: 1px solid #cdcdcd;
 flex-grow: 1;
 font-size: 1em;
 height: 26px;
 margin-right: 0;
 padding: 1px 9px;

}

  1. search-box:focus {
 border: 1px solid rgb(93, 154, 255);
 outline: none;

}

  1. search-button {
 border: none;
 border-bottom-left-radius: 0;
 border-top-left-radius: 0;
 box-shadow: none;
 display: flex;
 height: 30px;
 margin: 0;
 padding: 0;
 width: 60px;

}

  1. search-image {
 content:
     -webkit-image-set(
         url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAPCAQAAAB+HTb/AAAArElEQVR4Xn3NsUoCUBzG0XvB3U0chR4geo5qihpt6gkCx0bXFsMERWj2KWqIanAvmlUUoQapwU6g4l8H5bd9Z/iSPS0hu/RqZqrncBuzLl7U3Rn4cSpQFTeroejJl1Lgs7f4ceDPdeBMXYp86gaONYJkY83AnqHiGk9wHnjk16PKgo5N9BUCkzPf5j6M0PfuVg5MymoetFwoaKAlB26WdXAvJ7u5mezitqtkT//7Sv/u96CaLQAAAABJRU5ErkJggg==) 1x,
         url(data:image/png;base64,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) 2x);
 margin: auto;

}

.secondary-button {

 background: #d9d9d9;
 color: #696969;
 margin-inline-end: 16px;

}

.snackbar {

 background: #323232;
 border-radius: 2px;
 bottom: 24px;
 box-sizing: border-box;
 color: #fff;
 font-size: .87em;
 left: 24px;
 max-width: 568px;
 min-width: 288px;
 opacity: 0;
 padding: 16px 24px 12px;
 position: fixed;
 transform: translateY(90px);
 will-change: opacity, transform;
 z-index: 999;

}

.snackbar-show {

 -webkit-animation:
   show-snackbar .25s cubic-bezier(0.0, 0.0, 0.2, 1) forwards,
   hide-snackbar .25s cubic-bezier(0.4, 0.0, 1, 1) forwards 5s;

}

@-webkit-keyframes show-snackbar {

 100% {
   opacity: 1;
   transform: translateY(0);
 }

}

@-webkit-keyframes hide-snackbar {

 0% {
   opacity: 1;
   transform: translateY(0);
 }
 100% {
   opacity: 0;
   transform: translateY(90px);
 }

}

.suggestions {

 margin-top: 18px;

}

.suggestion-header {

 font-weight: bold;
 margin-bottom: 4px;

}

.suggestion-body {

 color: #777;

}

/* Increase line height at higher resolutions. */ @media (min-width: 641px) and (min-height: 641px) {

 #help-box-inner {
   line-height: 18px;
 }

}

/* Decrease padding at low sizes. */ @media (max-width: 640px), (max-height: 640px) {

 h1 {
   margin: 0 0 15px;
 }
 #content-top {
   margin: 15px;
 }
 #help-box-inner {
   padding: 20px;
 }
 .suggestions {
   margin-top: 10px;
 }
 .suggestion-header {
   margin-bottom: 0;
 }

}

  1. download-link, #download-link-clicked {
 margin-bottom: 30px;
 margin-top: 30px;

}

  1. download-link-clicked {
 color: #BBB;

}

  1. download-link:before, #download-link-clicked:before {
 content: url(data:image/svg+xml;base64,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);
 display: inline-block;
 margin-inline-end: 4px;
 vertical-align: -webkit-baseline-middle;

}

  1. download-link-clicked:before {
 width: 0px;
 opacity: 0;

}

  1. offline-content-list-visibility-card {
 border: 1px solid white;
 border-radius: 8px;
 display: flex;
 font-size: .8em;
 justify-content: space-between;
 line-height: 1;

}

  1. offline-content-list.list-hidden #offline-content-list-visibility-card {
 border-color: rgb(218, 220, 224);

}

  1. offline-content-list-visibility-card > div {
 padding: 1em;

}

  1. offline-content-list-title {
 color: var(--google-gray-700);

}

  1. offline-content-list-show-text, #offline-content-list-hide-text {
 color: rgb(66, 133, 244);

}

/* Hides the "hide" text div when the offline content list is collapsed/hidden

* and, alternatively, hides the "show" text div when the offline content list
* is expanded/shown.
*/
  1. offline-content-list.list-hidden #offline-content-list-hide-text,
  2. offline-content-list:not(.list-hidden) #offline-content-list-show-text {
 display: none;

}

/* Controls the animation of the offline content list when it is expanded/shown.

*/
  1. offline-content-suggestions {
 /* Max-height has to be set for the height animation to work. The chosen value
  * is a little greater than the maximum height the list will have, when all
  * suggestions have images, so that it is never clamped. This makes so that
  * when the actual height is smaller then the animation is not as smooth.
  */
 max-height: 27em;
 transition: max-height 0.2s ease-in, visibility 0s 0.2s,
             opacity 0.2s 0.2s linear;

}

/* Controls the animation of the offline content list when it is

* collapsed/hidden.
*/
  1. offline-content-list.list-hidden #offline-content-suggestions {
 max-height: 0;
 visibility: hidden;
 opacity: 0;
 transition: opacity 0.2s linear, visibility 0s 0.2s,
             max-height 0.2s 0.2s ease-out;

}

  1. offline-content-list {
 margin-inline-start: -5%;
 width: 110%;

}

/* The selectors below adjust the "overflow" of the suggestion cards contents

* based on the same screen size based strategy used for the main frame, which
* is applied by the `interstitial-wrapper` class. */

@media (max-width: 420px) {

 #offline-content-list {
   margin-inline-start: -2.5%;
   width: 105%;
 }

} @media (max-width: 420px) and (orientation: portrait),

      (max-height: 560px) {
 #offline-content-list {
   margin-inline-start: -12px;
   width: calc(100% + 24px);
 }

}

.suggestion-with-image .offline-content-suggestion-thumbnail {

 flex-basis: 8.2em;
 flex-shrink: 0;

}

.suggestion-with-image .offline-content-suggestion-thumbnail > img {

 height: 100%;
 width: 100%;

}

.suggestion-with-image #offline-content-list:not(.is-rtl) .offline-content-suggestion-thumbnail > img {

 border-bottom-right-radius: 7px;
 border-top-right-radius: 7px;

}

.suggestion-with-image #offline-content-list.is-rtl .offline-content-suggestion-thumbnail > img {

 border-bottom-left-radius: 7px;
 border-top-left-radius: 7px;

}

.suggestion-with-icon .offline-content-suggestion-thumbnail {

 align-items: center;
 display: flex;
 justify-content: center;
 min-height: 4.2em;
 min-width: 4.2em;

}

.suggestion-with-icon .offline-content-suggestion-thumbnail > div {

 align-items: center;
 background-color: rgb(241, 243, 244);
 border-radius: 50%;
 display: flex;
 height: 2.3em;
 justify-content: center;
 width: 2.3em;

}

.suggestion-with-icon .offline-content-suggestion-thumbnail > div > img {

 height: 1.45em;
 width: 1.45em;

}

.offline-content-suggestion-favicon {

 height: 1em;
 margin-inline-end: 0.4em;
 width: 1.4em;

}

.offline-content-suggestion-favicon > img {

 height: 1.4em;
 width: 1.4em;

}

.no-favicon .offline-content-suggestion-favicon {

 display: none;

}

.image-video {

 content: url(data:image/svg+xml;base64,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);

}

.image-music-note {

 content: url(data:image/svg+xml;base64,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);

}

.image-earth {

 content: url(data:image/svg+xml;base64,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);

}

.image-file {

 content: url(data:image/svg+xml;base64,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);

}

.offline-content-suggestion-texts {

 display: flex;
 flex-direction: column;
 justify-content: space-between;
 line-height: 1.3;
 padding: .9em;
 width: 100%;

}

.offline-content-suggestion-title {

 -webkit-box-orient: vertical;
 -webkit-line-clamp: 3;
 color: rgb(32, 33, 36);
 display: -webkit-box;
 font-size: 1.1em;
 overflow: hidden;
 text-overflow: ellipsis;

}

div.offline-content-suggestion {

 align-items: stretch;
 border: 1px solid rgb(218, 220, 224);
 border-radius: 8px;
 display: flex;
 justify-content: space-between;
 margin-bottom: .8em;

}

.suggestion-with-image {

 flex-direction: row;
 height: 8.2em;
 max-height: 8.2em;

}

.suggestion-with-icon {

 flex-direction: row-reverse;
 height: 4.2em;
 max-height: 4.2em;

}

.suggestion-with-icon .offline-content-suggestion-title {

 -webkit-line-clamp: 1;
 word-break: break-all;

}

.suggestion-with-icon .offline-content-suggestion-texts {

 padding-inline-start: 0px;

}

.offline-content-suggestion-attribution-freshness {

 color: rgb(95, 99, 104);
 display: flex;
 font-size: .8em;
 line-height: 1.7em;

}

.offline-content-suggestion-attribution {

 -webkit-box-orient: vertical;
 -webkit-line-clamp: 1;
 display: -webkit-box;
 flex-shrink: 1;
 margin-inline-end: 0.3em;
 overflow-wrap: break-word;
 overflow: hidden;
 text-overflow: ellipsis;
 word-break: break-all;

}

.no-attribution .offline-content-suggestion-attribution {

 display: none;

}

.offline-content-suggestion-freshness:before {

 content: '-';
 display: inline-block;
 flex-shrink: 0;
 margin-inline-end: .1em;
 margin-inline-start: .1em;

}

.no-attribution .offline-content-suggestion-freshness:before {

 display: none;

}

.offline-content-suggestion-freshness {

 flex-shrink: 0;

}

.suggestion-with-image .offline-content-suggestion-pin-spacer {

 flex-shrink: 1;
 flex-grow: 100;

}

.suggestion-with-image .offline-content-suggestion-pin {

 content: url(data:image/svg+xml;base64,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);
 flex-shrink: 0;
 height: 1.4em;
 margin-inline-start: .4em;
 width: 1.4em;

}

/* Controls the animation (and a bit more) of the launch-downloads-home action

* button when the offline content list is expanded/shown.
*/
  1. offline-content-list-action {
 text-align: center;
 transition: visibility 0s 0.2s, opacity 0.2s 0.2s linear;

}

/* Controls the animation of the launch-downloads-home action button when the

* offline content list is collapsed/hidden.
*/
  1. offline-content-list.list-hidden #offline-content-list-action {
 visibility: hidden;
 opacity: 0;
 transition: opacity 0.2s linear, visibility 0s 0.2s;

}

  1. cancel-save-page-button {
 background-image: url(data:image/svg+xml;base64,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);
 background-position: right 27px center;
 background-repeat: no-repeat;
 border: 1px solid var(--google-gray-300);
 border-radius: 5px;
 color: var(--google-gray-700);
 margin-bottom: 26px;
 padding-bottom: 16px;
 padding-inline-end: 88px;
 padding-inline-start: 16px;
 padding-top: 16px;
 text-align: start;

}

html[dir="rtl"] #cancel-save-page-button {

 background-position: left 27px center;

}

  1. save-page-for-later-button {
 display: flex;
 justify-content: start;

}

  1. save-page-for-later-button a:before {
 content: url(data:image/svg+xml;base64,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);
 display: inline-block;
 margin-inline-end: 4px;
 vertical-align: -webkit-baseline-middle;

}

.hidden#save-page-for-later-button {

 display: none;

}

/* Don't allow overflow when in a subframe. */ html[subframe] body {

 overflow: hidden;

}

  1. sub-frame-error {
 -webkit-align-items: center;
 background-color: #DDD;
 display: -webkit-flex;
 -webkit-flex-flow: column;
 height: 100%;
 -webkit-justify-content: center;
 left: 0;
 position: absolute;
 text-align: center;
 top: 0;
 transition: background-color .2s ease-in-out;
 width: 100%;

}

  1. sub-frame-error:hover {
 background-color: #EEE;

}

  1. sub-frame-error .icon-generic {
 margin: 0 0 16px;

}

  1. sub-frame-error-details {
 margin: 0 10px;
 text-align: center;
 visibility: hidden;

}

/* Show details only when hovering. */

  1. sub-frame-error:hover #sub-frame-error-details {
 visibility: visible;

}

/* If the iframe is too small, always hide the error code. */ /* TODO(mmenke): See if overflow: no-display works better, once supported. */ @media (max-width: 200px), (max-height: 95px) {

 #sub-frame-error-details {
   display: none;
 }

}

/* Adjust icon for small embedded frames in apps. */ @media (max-height: 100px) {

 #sub-frame-error .icon-generic {
   height: auto;
   margin: 0;
   padding-top: 0;
   width: 25px;
 }

}

/* details-button is special; it's a <button> element that looks like a link. */

  1. details-button {
 box-shadow: none;
 min-width: 0;

}

/* Styles for platform dependent separation of controls and details button. */ .suggested-left > #control-buttons, .suggested-right > #details-button {

 float: left;

}

.suggested-right > #control-buttons, .suggested-left > #details-button {

 float: right;

}

.suggested-left .secondary-button {

 margin-inline-end: 0px;
 margin-inline-start: 16px;

}

  1. details-button.singular {
 float: none;

}

/* download-button shows both icon and text. */

  1. download-button {
 padding-bottom: 4px;
 padding-top: 4px;
 position: relative;

}

  1. download-button:before {
 background: -webkit-image-set(
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAQAAABKfvVzAAAAO0lEQVQ4y2NgGArgPxIY1YChsOE/LtBAmpYG0mxpIOSDBpKUo2lpIDZxNJCkHKqlYZAla3RAHQ1DFgAARRroHyLNTwwAAAAASUVORK5CYII=) 1x,
     url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAQAAAD9CzEMAAAAZElEQVRYw+3Ruw3AMAwDUY3OzZUmRRD4E9iim9wNwAdbEURHyk4AAAAATiCVK8lLyPsKeT9K3lsownnunfkPxO78hKiYHxBV8x2icr5BVM+/CMf8g3DN34Rzns6ViwHUAUQ/6wIAd5Km7l6c8AAAAABJRU5ErkJggg==) 2x)
   no-repeat;
 content: ;
 display: inline-block;
 width: 24px;
 height: 24px;
 margin-inline-end: 4px;
 margin-inline-start: -4px;
 vertical-align: middle;

}

  1. download-button:disabled {
 background: rgb(180, 206, 249);
 color: rgb(255, 255, 255);

}

/* TODO(https://crbug.com/852872): UI for offline suggested content is incomplete.

  • /

.suggested-thumbnail {

 width: 25vw;
 height: 25vw;

}

/* Alternate dino page button styles */

  1. control-buttons .reload-button-alternate:disabled {
 background: #ccc;
 color: #fff;
 font-size: 14px;
 height: 48px;

}

  1. buttons::after {
 clear: both;
 content: ;
 display: block;
 width: 100%;

}

/* Offline page */ .offline {

 transition: filter 1.5s cubic-bezier(0.65, 0.05, 0.36, 1),
             background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
 will-change: filter, background-color;

}

.offline body {

 transition: background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);

}

.offline #main-message > p {

 display: none;

}

/* iOS WKWebView inverts the background color set at the HTML level whereas Blink does not. */ .offline.inverted {

 filter: invert(1);
 background-color: #000;


}

.offline.inverted body {

 background-color: #fff;

}

.offline .interstitial-wrapper {

 color: var(--text-color);
 font-size: 1em;
 line-height: 1.55;
 margin: 0 auto;
 max-width: 600px;
 padding-top: 100px;
 width: 100%;

}

.offline .runner-container {

 direction: ltr;
 height: 150px;
 max-width: 600px;
 overflow: hidden;
 position: absolute;
 top: 35px;
 width: 44px;

}

.offline .runner-canvas {

 height: 150px;
 max-width: 600px;
 opacity: 1;
 overflow: hidden;
 position: absolute;
 top: 0;
 z-index: 10;

}

.offline .controller {

 background: rgba(247,247,247, .1);
 height: 100vh;
 left: 0;
 position: absolute;
 top: 0;
 width: 100vw;
 z-index: 9;

}

  1. offline-resources {
 display: none;

}

  1. offline-instruction {
 image-rendering: pixelated;
 left: 0;
 margin: auto;
 position: absolute;
 right: 0;
 top: 60px;
 width: fit-content;

}

@media (max-width: 420px) {

 #download-button {
   padding-bottom: 12px;
   padding-top: 12px;
 }
 .suggested-left > #control-buttons,
 .suggested-right > #control-buttons {
   float: none;
 }
 .snackbar {
   left: 0;
   bottom: 0;
   width: 100%;
   border-radius: 0;
 }

}

@media (max-height: 350px) {

 h1 {
   margin: 0 0 15px;
 }
 .icon-offline {
   margin: 0 0 10px;
 }
 .interstitial-wrapper {
   margin-top: 5%;
 }
 .nav-wrapper {
   margin-top: 30px;
 }

}

@media (min-width: 420px) and (max-width: 736px) and

      (min-height: 240px) and (max-height: 420px) and
      (orientation:landscape) {
 .interstitial-wrapper {
   margin-bottom: 100px;
 }

}

@media (max-width: 360px) and (max-height: 480px) {

 .offline .interstitial-wrapper {
   padding-top: 60px;
 }
 .offline .runner-container {
   top: 8px;
 }

}

@media (min-height: 240px) and (orientation: landscape) {

 .offline .interstitial-wrapper {
   margin-bottom: 90px;
 }
 .icon-offline {
   margin-bottom: 20px;
 }

}

@media (max-height: 320px) and (orientation: landscape) {

 .icon-offline {
   margin-bottom: 0;
 }
 .offline .runner-container {
   top: 10px;
 }

}

@media (max-width: 240px) {

 button {
   padding-left: 12px;
   padding-right: 12px;
 }
 .interstitial-wrapper {
   overflow: inherit;
   padding: 0 8px;
 }

}

@media (max-width: 120px) {

 button {
   width: auto;
 }

}

.arcade-mode, .arcade-mode .runner-container, .arcade-mode .runner-canvas {

 image-rendering: pixelated;
 max-width: 100%;
 overflow: hidden;

}

.arcade-mode #buttons, .arcade-mode #main-content {

 opacity: 0;
 overflow: hidden;

}

.arcade-mode .interstitial-wrapper {

 height: 100vh;
 max-width: 100%;
 overflow: hidden;

}

.arcade-mode .runner-container {

 left: 0;
 margin: auto;
 right: 0;
 transform-origin: top center;
 transition: transform 250ms cubic-bezier(0.4, 0.0, 1, 1) .4s;
 z-index: 2;

}

@media (prefers-color-scheme: dark) {

 .icon {
   filter: invert(1);
 }
 .offline .runner-canvas {
   filter: invert(1);
 }
 .offline.inverted {
   filter: invert(0);
 
   background-color: var(--background-color);
 
 
 }
 .offline.inverted body {
   background-color: #fff;
 }
 #suggestions-list a {
   color: var(--link-color);
 }
 #error-information-button {
   filter: invert(0.6);
 }

} </style>

 <script>// Copyright 2017 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.

// This is the shared code for security interstitials. It is used for both SSL // interstitials and Safe Browsing interstitials.

// Should match security_interstitials::SecurityInterstitialCommand /** @enum| {string} */ var SecurityInterstitialCommandId = {

 CMD_DONT_PROCEED: 0,
 CMD_PROCEED: 1,
 // Ways for user to get more information
 CMD_SHOW_MORE_SECTION: 2,
 CMD_OPEN_HELP_CENTER: 3,
 CMD_OPEN_DIAGNOSTIC: 4,
 // Primary button actions
 CMD_RELOAD: 5,
 CMD_OPEN_DATE_SETTINGS: 6,
 CMD_OPEN_LOGIN: 7,
 // Safe Browsing Extended Reporting
 CMD_DO_REPORT: 8,
 CMD_DONT_REPORT: 9,
 CMD_OPEN_REPORTING_PRIVACY: 10,
 CMD_OPEN_WHITEPAPER: 11,
 // Report a phishing error.
 CMD_REPORT_PHISHING_ERROR: 12

};

var HIDDEN_CLASS = 'hidden';

/**

* A convenience method for sending commands to the parent page.
* @param {string} cmd  The command to send.
*/

function sendCommand(cmd) {

 if (window.certificateErrorPageController) {
   switch (cmd) {
     case SecurityInterstitialCommandId.CMD_DONT_PROCEED:
       certificateErrorPageController.dontProceed();
       break;
     case SecurityInterstitialCommandId.CMD_PROCEED:
       certificateErrorPageController.proceed();
       break;
     case SecurityInterstitialCommandId.CMD_SHOW_MORE_SECTION:
       certificateErrorPageController.showMoreSection();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_HELP_CENTER:
       certificateErrorPageController.openHelpCenter();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_DIAGNOSTIC:
       certificateErrorPageController.openDiagnostic();
       break;
     case SecurityInterstitialCommandId.CMD_RELOAD:
       certificateErrorPageController.reload();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_DATE_SETTINGS:
       certificateErrorPageController.openDateSettings();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_LOGIN:
       certificateErrorPageController.openLogin();
       break;
     case SecurityInterstitialCommandId.CMD_DO_REPORT:
       certificateErrorPageController.doReport();
       break;
     case SecurityInterstitialCommandId.CMD_DONT_REPORT:
       certificateErrorPageController.dontReport();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_REPORTING_PRIVACY:
       certificateErrorPageController.openReportingPrivacy();
       break;
     case SecurityInterstitialCommandId.CMD_OPEN_WHITEPAPER:
       certificateErrorPageController.openWhitepaper();
       break;
     case SecurityInterstitialCommandId.CMD_REPORT_PHISHING_ERROR:
       certificateErrorPageController.reportPhishingError();
       break;
   }
   return;
 }

//

 window.domAutomationController.send(cmd);

// // }

/**

* Call this to stop clicks on <a href="#"> links from scrolling to the top of
 * the page (and possibly showing a # in the link).
*/

function preventDefaultOnPoundLinkClicks() {

 document.addEventListener('click', function(e) {
   var anchor = findAncestor(/** @type {Node} */ (e.target), function(el) {
     return el.tagName == 'A';
   });
   // Use getAttribute() to prevent URL normalization.
   if (anchor && anchor.getAttribute('href') == '#')
     e.preventDefault();
 });

} </script>

 <script>// Copyright 2015 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.

var mobileNav = false;

/**

* For small screen mobile the navigation buttons are moved
* below the advanced text.
*/

function onResize() {

 var helpOuterBox = document.querySelector('#details');
 var mainContent = document.querySelector('#main-content');
 var mediaQuery = '(min-width: 240px) and (max-width: 420px) and ' +
     '(min-height: 401px), ' +
     '(max-height: 560px) and (min-height: 240px) and ' +
     '(min-width: 421px)';
 var detailsHidden = helpOuterBox.classList.contains(HIDDEN_CLASS);
 var runnerContainer = document.querySelector('.runner-container');
 // Check for change in nav status.
 if (mobileNav != window.matchMedia(mediaQuery).matches) {
   mobileNav = !mobileNav;
   // Handle showing the top content / details sections according to state.
   if (mobileNav) {
     mainContent.classList.toggle(HIDDEN_CLASS, !detailsHidden);
     helpOuterBox.classList.toggle(HIDDEN_CLASS, detailsHidden);
     if (runnerContainer) {
       runnerContainer.classList.toggle(HIDDEN_CLASS, !detailsHidden);
     }
   } else if (!detailsHidden) {
     // Non mobile nav with visible details.
     mainContent.classList.remove(HIDDEN_CLASS);
     helpOuterBox.classList.remove(HIDDEN_CLASS);
     if (runnerContainer) {
       runnerContainer.classList.remove(HIDDEN_CLASS);
     }
   }
 }

}

function setupMobileNav() {

 window.addEventListener('resize', onResize);
 onResize();

}

document.addEventListener('DOMContentLoaded', setupMobileNav); </script>

 <script>// Copyright 2013 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.

// Decodes a UTF16 string that is encoded as base64. function decodeUTF16Base64ToString(encoded_text) {

 var data = atob(encoded_text);
 var result = ;
 for (var i = 0; i < data.length; i += 2) {
   result +=
       String.fromCharCode(data.charCodeAt(i) * 256 + data.charCodeAt(i + 1));
 }
 return result;

}

function toggleHelpBox() {

 var helpBoxOuter = document.getElementById('details');
 helpBoxOuter.classList.toggle(HIDDEN_CLASS);
 var detailsButton = document.getElementById('details-button');
 if (helpBoxOuter.classList.contains(HIDDEN_CLASS))
   detailsButton.innerText = detailsButton.detailsText;
 else
   detailsButton.innerText = detailsButton.hideDetailsText;
 // Details appears over the main content on small screens.
 if (mobileNav) {
   document.getElementById('main-content').classList.toggle(HIDDEN_CLASS);
   var runnerContainer = document.querySelector('.runner-container');
   if (runnerContainer) {
     runnerContainer.classList.toggle(HIDDEN_CLASS);
   }
 }

}

function diagnoseErrors() { //

   if (window.errorPageController)
     errorPageController.diagnoseErrorsButtonClick();

// // }

// Subframes use a different layout but the same html file. This is to make it // easier to support platforms that load the error page via different // mechanisms (Currently just iOS). if (window.top.location != window.location)

 document.documentElement.setAttribute('subframe', );

// Re-renders the error page using |strings| as the dictionary of values. // Used by NetErrorTabHelper to update DNS error pages with probe results. function updateForDnsProbe(strings) {

 var context = new JsEvalContext(strings);
 jstProcess(context, document.getElementById('t'));
 onDocumentLoadOrUpdate();

}

// Given the classList property of an element, adds an icon class to the list // and removes the previously- function updateIconClass(classList, newClass) {

 var oldClass;
 if (classList.hasOwnProperty('last_icon_class')) {
   oldClass = classList['last_icon_class'];
   if (oldClass == newClass)
     return;
 }
 classList.add(newClass);
 if (oldClass !== undefined)
   classList.remove(oldClass);
 classList['last_icon_class'] = newClass;
 if (newClass == 'icon-offline') {
   document.firstElementChild.classList.add('offline');
   new Runner('.interstitial-wrapper');
 } else {
   document.body.classList.add('neterror');
 }

}

// Does a search using |baseSearchUrl| and the text in the search box. function search(baseSearchUrl) {

 var searchTextNode = document.getElementById('search-box');
 document.location = baseSearchUrl + searchTextNode.value;
 return false;

}

// Use to track clicks on elements generated by the navigation correction // service. If |trackingId| is negative, the element does not come from the // correction service. function trackClick(trackingId) {

 // This can't be done with XHRs because XHRs are cancelled on navigation
 // start, and because these are cross-site requests.
 if (trackingId >= 0 && errorPageController)
   errorPageController.trackClick(trackingId);

}

// Called when an <a> tag generated by the navigation correction service is // clicked. Separate function from trackClick so the resources don't have to // be updated if new data is added to jstdata. function linkClicked(jstdata) {

 trackClick(jstdata.trackingId);

}

// Implements button clicks. This function is needed during the transition // between implementing these in trunk chromium and implementing them in // iOS. function reloadButtonClick(url) {

 if (window.errorPageController) {
   errorPageController.reloadButtonClick();
 } else {
   location = url;
 }

}

function downloadButtonClick() {

 if (window.errorPageController) {
   errorPageController.downloadButtonClick();
   var downloadButton = document.getElementById('download-button');
   downloadButton.disabled = true;
   downloadButton.textContent = downloadButton.disabledText;
   document.getElementById('download-link-wrapper')
       .classList.add(HIDDEN_CLASS);
   document.getElementById('download-link-clicked-wrapper')
       .classList.remove(HIDDEN_CLASS);
 }

}

function detailsButtonClick() {

 if (window.errorPageController)
   errorPageController.detailsButtonClick();

}

/**

* Replace the reload button with the Google cached copy suggestion.
*/

function setUpCachedButton(buttonStrings) {

 var reloadButton = document.getElementById('reload-button');
 reloadButton.textContent = buttonStrings.msg;
 var url = buttonStrings.cacheUrl;
 var trackingId = buttonStrings.trackingId;
 reloadButton.onclick = function(e) {
   e.preventDefault();
   trackClick(trackingId);
   if (window.errorPageController) {
     errorPageController.trackCachedCopyButtonClick();
   }
   location = url;
 };
 reloadButton.style.display = ;

}

var primaryControlOnLeft = true; //

function setAutoFetchState(scheduled, can_schedule) {

 document.getElementById('cancel-save-page-button')
     .classList.toggle(HIDDEN_CLASS, !scheduled);
 document.getElementById('save-page-for-later-button')
     .classList.toggle(HIDDEN_CLASS, scheduled || !can_schedule);

}

function savePageLaterClick() {

 errorPageController.savePageForLater();
 // savePageForLater will eventually trigger a call to setAutoFetchState() when
 // it completes.

}

function cancelSavePageClick() {

 errorPageController.cancelSavePage();
 // setAutoFetchState is not called in response to cancelSavePage(), so do it
 // now.
 setAutoFetchState(false, true);

}

function toggleErrorInformationPopup() {

 document.getElementById('error-information-popup-container')
     .classList.toggle(HIDDEN_CLASS);

}

function launchOfflineItem(itemID, name_space) {

 errorPageController.launchOfflineItem(itemID, name_space);

}

function launchDownloadsPage() {

 errorPageController.launchDownloadsPage();

}

function getIconForSuggestedItem(item) {

 // Note: |item.content_type| contains the enum values from
 // chrome::mojom::AvailableContentType.
 switch (item.content_type) {
   case 1:  // kVideo
     return 'image-video';
   case 2:  // kAudio
     return 'image-music-note';
   case 0:  // kPrefetchedPage
   case 3:  // kOtherPage
     return 'image-earth';
 }
 return 'image-file';

}

function getSuggestedContentDiv(item, index) {

 // Note: See AvailableContentToValue in available_offline_content_helper.cc
 // for the data contained in an |item|.
 // TODO(carlosk): Present |snippet_base64| when that content becomes
 // available.
 var thumbnail = ;
 var extraContainerClasses = [];
 // html_inline.py will try to replace src attributes with data URIs using a
 // simple regex. The following is obfuscated slightly to avoid that.
 var src = 'src';
 if (item.thumbnail_data_uri) {
   extraContainerClasses.push('suggestion-with-image');
   thumbnail = `<img ${src}="${item.thumbnail_data_uri}">`;
 } else {
   extraContainerClasses.push('suggestion-with-icon');
   iconClass = getIconForSuggestedItem(item);

thumbnail = `

<img class="${iconClass}">

`;

 }
 var favicon = ;
 if (item.favicon_data_uri) {
   favicon = `<img ${src}="${item.favicon_data_uri}">`;
 } else {
   extraContainerClasses.push('no-favicon');
 }
 if (!item.attribution_base64)
   extraContainerClasses.push('no-attribution');
 return `
           ${favicon}
           ${item.date_modified}
       ${thumbnail}

`;

}

// Populates a list of suggested offline content. // Note: For security reasons all content downloaded from the web is considered // unsafe and must be securely handled to be presented on the dino page. Images // have already been safely re-encoded but textual content -- like title and // attribution -- must be properly handled here. function offlineContentAvailable(isShown, suggestions) {

 if (!suggestions || !loadTimeData.valueExists('offlineContentList'))
   return;
 var suggestionsHTML = [];
 for (var index = 0; index < suggestions.length; index++)
   suggestionsHTML.push(getSuggestedContentDiv(suggestions[index], index));
 document.getElementById('offline-content-suggestions').innerHTML =
     suggestionsHTML.join('\n');
 // Sets textual web content using |textContent| to make sure it's handled as
 // plain text.
 for (var index = 0; index < suggestions.length; index++) {
   document.getElementById(`offline-content-suggestion-title-${index}`)
       .textContent =
       decodeUTF16Base64ToString(suggestions[index].title_base64);
   document.getElementById(`offline-content-suggestion-attribution-${index}`)
       .textContent =
       decodeUTF16Base64ToString(suggestions[index].attribution_base64);
 }
 var contentListElement = document.getElementById('offline-content-list');
 if (document.dir == 'rtl')
   contentListElement.classList.add('is-rtl');
 contentListElement.hidden = false;
 // The list is configured as hidden by default. Show it if needed.
 if (isShown)
   toggleOfflineContentListVisibility(false);

}

function toggleOfflineContentListVisibility(updatePref) {

 if (!loadTimeData.valueExists('offlineContentList'))
   return;
 var contentListElement = document.getElementById('offline-content-list');
 var isVisible = !contentListElement.classList.toggle('list-hidden');
 if (updatePref && window.errorPageController) {
   errorPageController.listVisibilityChanged(isVisible);
 }

}

// Called on document load, and from updateForDnsProbe(). function onDocumentLoadOrUpdate() {

 var downloadButtonVisible = loadTimeData.valueExists('downloadButton') &&
     loadTimeData.getValue('downloadButton').msg;
 var detailsButton = document.getElementById('details-button');
 // If offline content suggestions will be visible, the usual buttons will not
 // be presented.
 var offlineContentVisible =
     loadTimeData.valueExists('suggestedOfflineContentPresentation');
 if (offlineContentVisible) {
   document.querySelector('.nav-wrapper').classList.add(HIDDEN_CLASS);
   detailsButton.classList.add(HIDDEN_CLASS);
   document.getElementById('download-link').hidden = !downloadButtonVisible;
   document.getElementById('download-links-wrapper')
       .classList.remove(HIDDEN_CLASS);
   document.getElementById('error-information-popup-container')
       .classList.add('use-popup-container', HIDDEN_CLASS)
   document.getElementById('error-information-button')
       .classList.remove(HIDDEN_CLASS);
 }
 var attemptAutoFetch = loadTimeData.valueExists('attemptAutoFetch') &&
     loadTimeData.getValue('attemptAutoFetch');
 var reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
     loadTimeData.getValue('reloadButton').msg;
 // Check for Google cached copy suggestion.
 var cacheButtonVisible = false;
 if (loadTimeData.valueExists('cacheButton')) {
   setUpCachedButton(loadTimeData.getValue('cacheButton'));
   cacheButtonVisible = true;
 }
 var reloadButton = document.getElementById('reload-button');
 var downloadButton = document.getElementById('download-button');
 if (reloadButton.style.display == 'none' &&
     downloadButton.style.display == 'none') {
   detailsButton.classList.add('singular');
 }
 // Show or hide control buttons.
 var controlButtonDiv = document.getElementById('control-buttons');
 controlButtonDiv.hidden = offlineContentVisible ||
     !(reloadButtonVisible || downloadButtonVisible || cacheButtonVisible);

}

function onDocumentLoad() {

 // Sets up the proper button layout for the current platform.
 if (primaryControlOnLeft) {
   buttons.classList.add('suggested-left');
 } else {
   buttons.classList.add('suggested-right');
 }
 onDocumentLoadOrUpdate();

}

document.addEventListener('DOMContentLoaded', onDocumentLoad); </script>

 <script>// Copyright (c) 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. (function() { 'use strict'; /**

* T-Rex runner.
* @param {string} outerContainerId Outer containing element id.
* @param {Object} opt_config
* @constructor
 * @export
 */

function Runner(outerContainerId, opt_config) {

 // Singleton
 if (Runner.instance_) {
   return Runner.instance_;
 }
 Runner.instance_ = this;
 this.outerContainerEl = document.querySelector(outerContainerId);
 this.containerEl = null;
 this.snackbarEl = null;
 // A div to intercept touch events. Only set while (playing && useTouch).
 this.touchController = null;
 this.config = opt_config || Runner.config;
 // Logical dimensions of the container.
 this.dimensions = Runner.defaultDimensions;
 this.canvas = null;
 this.canvasCtx = null;
 this.tRex = null;
 this.distanceMeter = null;
 this.distanceRan = 0;
 this.highestScore = 0;
 this.syncHighestScore = false;
 this.time = 0;
 this.runningTime = 0;
 this.msPerFrame = 1000 / FPS;
 this.currentSpeed = this.config.SPEED;
 this.obstacles = [];
 this.activated = false; // Whether the easter egg has been activated.
 this.playing = false; // Whether the game is currently in play state.
 this.crashed = false;
 this.paused = false;
 this.inverted = false;
 this.invertTimer = 0;
 this.resizeTimerId_ = null;
 this.playCount = 0;
 // Sound FX.
 this.audioBuffer = null;
 this.soundFx = {};
 // Global web audio context for playing sounds.
 this.audioContext = null;
 // Images.
 this.images = {};
 this.imagesLoaded = 0;
 if (this.isDisabled()) {
   this.setupDisabledRunner();
 } else {
   this.loadImages();
   window['initializeEasterEggHighScore'] =
       this.initializeHighScore.bind(this);
 }

} window['Runner'] = Runner;

/**

* Default game width.
* @const
 */

var DEFAULT_WIDTH = 600;

/**

* Frames per second.
* @const
 */

var FPS = 60;

/** @const */ var IS_HIDPI = window.devicePixelRatio > 1;

/** @const */ // iPads are returning "MacIntel" for iOS 13 (devices & simulators). // Chrome on macOS also returns "MacIntel" for navigator.platform, // but navigator.userAgent includes /Safari/. // TODO(crbug.com/998999): Fix navigator.userAgent such that it reliably // returns an agent string containing "CriOS". var IS_IOS = /CriOS/.test(window.navigator.userAgent) ||

   /iPad|iPhone|iPod|MacIntel/.test(window.navigator.platform) &&
       !(/Safari/.test(window.navigator.userAgent));

/** @const */ var IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;

/** @const */ var ARCADE_MODE_URL = 'chrome://dino/';

/**

* Default game configuration.
* @enum {number}
*/

Runner.config = {

 ACCELERATION: 0.001,
 BG_CLOUD_SPEED: 0.2,
 BOTTOM_PAD: 10,
 // Scroll Y threshold at which the game can be activated.
 CANVAS_IN_VIEW_OFFSET: -10,
 CLEAR_TIME: 3000,
 CLOUD_FREQUENCY: 0.5,
 GAMEOVER_CLEAR_TIME: 750,
 GAP_COEFFICIENT: 0.6,
 GRAVITY: 0.6,
 INITIAL_JUMP_VELOCITY: 12,
 INVERT_FADE_DURATION: 12000,
 INVERT_DISTANCE: 700,
 MAX_BLINK_COUNT: 3,
 MAX_CLOUDS: 6,
 MAX_OBSTACLE_LENGTH: 3,
 MAX_OBSTACLE_DUPLICATION: 2,
 MAX_SPEED: 13,
 MIN_JUMP_HEIGHT: 35,
 MOBILE_SPEED_COEFFICIENT: 1.2,
 RESOURCE_TEMPLATE_ID: 'audio-resources',
 SPEED: 6,
 SPEED_DROP_COEFFICIENT: 3,
 ARCADE_MODE_INITIAL_TOP_POSITION: 35,
 ARCADE_MODE_TOP_POSITION_PERCENT: 0.1

};


/**

* Default dimensions.
* @enum {string}
*/

Runner.defaultDimensions = {

 WIDTH: DEFAULT_WIDTH,
 HEIGHT: 150

};


/**

* CSS class names.
* @enum {string}
*/

Runner.classes = {

 ARCADE_MODE: 'arcade-mode',
 CANVAS: 'runner-canvas',
 CONTAINER: 'runner-container',
 CRASHED: 'crashed',
 ICON: 'icon-offline',
 INVERTED: 'inverted',
 SNACKBAR: 'snackbar',
 SNACKBAR_SHOW: 'snackbar-show',
 TOUCH_CONTROLLER: 'controller'

};


/**

* Sprite definition layout of the spritesheet.
* @enum {Object}
*/

Runner.spriteDefinition = {

 LDPI: {
   CACTUS_LARGE: {x: 332, y: 2},
   CACTUS_SMALL: {x: 228, y: 2},
   CLOUD: {x: 86, y: 2},
   HORIZON: {x: 2, y: 54},
   MOON: {x: 484, y: 2},
   PTERODACTYL: {x: 134, y: 2},
   RESTART: {x: 2, y: 2},
   TEXT_SPRITE: {x: 655, y: 2},
   TREX: {x: 848, y: 2},
   STAR: {x: 645, y: 2}
 },
 HDPI: {
   CACTUS_LARGE: {x: 652, y: 2},
   CACTUS_SMALL: {x: 446, y: 2},
   CLOUD: {x: 166, y: 2},
   HORIZON: {x: 2, y: 104},
   MOON: {x: 954, y: 2},
   PTERODACTYL: {x: 260, y: 2},
   RESTART: {x: 2, y: 2},
   TEXT_SPRITE: {x: 1294, y: 2},
   TREX: {x: 1678, y: 2},
   STAR: {x: 1276, y: 2}
 }

};


/**

* Sound FX. Reference to the ID of the audio tag on interstitial page.
* @enum {string}
*/

Runner.sounds = {

 BUTTON_PRESS: 'offline-sound-press',
 HIT: 'offline-sound-hit',
 SCORE: 'offline-sound-reached'

};


/**

* Key code mapping.
* @enum {Object}
*/

Runner.keycodes = {

 JUMP: {'38': 1, '32': 1},  // Up, spacebar
 DUCK: {'40': 1},  // Down
 RESTART: {'13': 1}  // Enter

};


/**

* Runner event names.
* @enum {string}
*/

Runner.events = {

 ANIM_END: 'webkitAnimationEnd',
 CLICK: 'click',
 KEYDOWN: 'keydown',
 KEYUP: 'keyup',
 POINTERDOWN: 'pointerdown',
 POINTERUP: 'pointerup',
 RESIZE: 'resize',
 TOUCHEND: 'touchend',
 TOUCHSTART: 'touchstart',
 VISIBILITY: 'visibilitychange',
 BLUR: 'blur',
 FOCUS: 'focus',
 LOAD: 'load'

};

Runner.prototype = {

 /**
  * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.
  * @return {boolean}
  */
 isDisabled: function() {
   return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');
 },
 /**
  * For disabled instances, set up a snackbar with the disabled message.
  */
 setupDisabledRunner: function() {
   this.containerEl = document.createElement('div');
   this.containerEl.className = Runner.classes.SNACKBAR;
   this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
   this.outerContainerEl.appendChild(this.containerEl);
   // Show notification when the activation key is pressed.
   document.addEventListener(Runner.events.KEYDOWN, function(e) {
     if (Runner.keycodes.JUMP[e.keyCode]) {
       this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
       document.querySelector('.icon').classList.add('icon-disabled');
     }
   }.bind(this));
 },
 /**
  * Setting individual settings for debugging.
  * @param {string} setting
  * @param {*} value
  */
 updateConfigSetting: function(setting, value) {
   if (setting in this.config && value != undefined) {
     this.config[setting] = value;
     switch (setting) {
       case 'GRAVITY':
       case 'MIN_JUMP_HEIGHT':
       case 'SPEED_DROP_COEFFICIENT':
         this.tRex.config[setting] = value;
         break;
       case 'INITIAL_JUMP_VELOCITY':
         this.tRex.setJumpVelocity(value);
         break;
       case 'SPEED':
         this.setSpeed(value);
         break;
     }
   }
 },
 /**
  * Cache the appropriate image sprite from the page and get the sprite sheet
  * definition.
  */
 loadImages: function() {
   if (IS_HIDPI) {
     Runner.imageSprite = document.getElementById('offline-resources-2x');
     this.spriteDef = Runner.spriteDefinition.HDPI;
   } else {
     Runner.imageSprite = document.getElementById('offline-resources-1x');
     this.spriteDef = Runner.spriteDefinition.LDPI;
   }
   if (Runner.imageSprite.complete) {
     this.init();
   } else {
     // If the images are not yet loaded, add a listener.
     Runner.imageSprite.addEventListener(Runner.events.LOAD,
         this.init.bind(this));
   }
 },
 /**
  * Load and decode base 64 encoded sounds.
  */
 loadSounds: function() {
   if (!IS_IOS) {
     this.audioContext = new AudioContext();
     var resourceTemplate =
         document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
     for (var sound in Runner.sounds) {
       var soundSrc =
           resourceTemplate.getElementById(Runner.sounds[sound]).src;
       soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
       var buffer = decodeBase64ToArrayBuffer(soundSrc);
       // Async, so no guarantee of order in array.
       this.audioContext.decodeAudioData(buffer, function(index, audioData) {
           this.soundFx[index] = audioData;
         }.bind(this, sound));
     }
   }
 },
 /**
  * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
  * @param {number} opt_speed
  */
 setSpeed: function(opt_speed) {
   var speed = opt_speed || this.currentSpeed;
   // Reduce the speed on smaller mobile screens.
   if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
     var mobileSpeed = speed * this.dimensions.WIDTH / DEFAULT_WIDTH *
         this.config.MOBILE_SPEED_COEFFICIENT;
     this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
   } else if (opt_speed) {
     this.currentSpeed = opt_speed;
   }
 },
 /**
  * Game initialiser.
  */
 init: function() {
   // Hide the static icon.
   document.querySelector('.' + Runner.classes.ICON).style.visibility =
       'hidden';
   this.adjustDimensions();
   this.setSpeed();
   this.containerEl = document.createElement('div');
   this.containerEl.className = Runner.classes.CONTAINER;
   // Player canvas container.
   this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
       this.dimensions.HEIGHT, Runner.classes.PLAYER);
   this.canvasCtx = this.canvas.getContext('2d');
   this.canvasCtx.fillStyle = '#f7f7f7';
   this.canvasCtx.fill();
   Runner.updateCanvasScaling(this.canvas);
   // Horizon contains clouds, obstacles and the ground.
   this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,
       this.config.GAP_COEFFICIENT);
   // Distance meter
   this.distanceMeter = new DistanceMeter(this.canvas,
         this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
   // Draw t-rex
   this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
   this.outerContainerEl.appendChild(this.containerEl);
   this.startListening();
   this.update();
   window.addEventListener(Runner.events.RESIZE,
       this.debounceResize.bind(this));
 },
 /**
  * Create the touch controller. A div that covers whole screen.
  */
 createTouchController: function() {
   this.touchController = document.createElement('div');
   this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
   this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
   this.touchController.addEventListener(Runner.events.TOUCHEND, this);
   this.outerContainerEl.appendChild(this.touchController);
 },
 /**
  * Debounce the resize event.
  */
 debounceResize: function() {
   if (!this.resizeTimerId_) {
     this.resizeTimerId_ =
         setInterval(this.adjustDimensions.bind(this), 250);
   }
 },
 /**
  * Adjust game space dimensions on resize.
  */
 adjustDimensions: function() {
   clearInterval(this.resizeTimerId_);
   this.resizeTimerId_ = null;
   var boxStyles = window.getComputedStyle(this.outerContainerEl);
   var padding = Number(boxStyles.paddingLeft.substr(0,
       boxStyles.paddingLeft.length - 2));
   this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
   if (this.isArcadeMode()) {
     this.dimensions.WIDTH = Math.min(DEFAULT_WIDTH, this.dimensions.WIDTH);
     if (this.activated) {
       this.setArcadeModeContainerScale();
     }
   }
   // Redraw the elements back onto the canvas.
   if (this.canvas) {
     this.canvas.width = this.dimensions.WIDTH;
     this.canvas.height = this.dimensions.HEIGHT;
     Runner.updateCanvasScaling(this.canvas);
     this.distanceMeter.calcXPos(this.dimensions.WIDTH);
     this.clearCanvas();
     this.horizon.update(0, 0, true);
     this.tRex.update(0);
     // Outer container and distance meter.
     if (this.playing || this.crashed || this.paused) {
       this.containerEl.style.width = this.dimensions.WIDTH + 'px';
       this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
       this.distanceMeter.update(0, Math.ceil(this.distanceRan));
       this.stop();
     } else {
       this.tRex.draw(0, 0);
     }
     // Game over panel.
     if (this.crashed && this.gameOverPanel) {
       this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
       this.gameOverPanel.draw();
     }
   }
 },
 /**
  * Play the game intro.
  * Canvas container width expands out to the full width.
  */
 playIntro: function() {
   if (!this.activated && !this.crashed) {
     this.playingIntro = true;
     this.tRex.playingIntro = true;
     // CSS animation definition.
     var keyframes = '@-webkit-keyframes intro { ' +
           'from { width:' + Trex.config.WIDTH + 'px }' +
           'to { width: ' + this.dimensions.WIDTH + 'px }' +
         '}';
     document.styleSheets[0].insertRule(keyframes, 0);
     this.containerEl.addEventListener(Runner.events.ANIM_END,
         this.startGame.bind(this));
     this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
     this.containerEl.style.width = this.dimensions.WIDTH + 'px';
     this.setPlayStatus(true);
     this.activated = true;
   } else if (this.crashed) {
     this.restart();
   }
 },


 /**
  * Update the game status to started.
  */
 startGame: function() {
   if (this.isArcadeMode()) {
     this.setArcadeMode();
   }
   this.runningTime = 0;
   this.playingIntro = false;
   this.tRex.playingIntro = false;
   this.containerEl.style.webkitAnimation = ;
   this.playCount++;
   // Handle tabbing off the page. Pause the current game.
   document.addEventListener(Runner.events.VISIBILITY,
         this.onVisibilityChange.bind(this));
   window.addEventListener(Runner.events.BLUR,
         this.onVisibilityChange.bind(this));
   window.addEventListener(Runner.events.FOCUS,
         this.onVisibilityChange.bind(this));
 },
 clearCanvas: function() {
   this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
       this.dimensions.HEIGHT);
 },
 /**
  * Checks whether the canvas area is in the viewport of the browser
  * through the current scroll position.
  * @return boolean.
  */
 isCanvasInView: function() {
   return this.containerEl.getBoundingClientRect().top >
       Runner.config.CANVAS_IN_VIEW_OFFSET;
 },
 /**
  * Update the game frame and schedules the next one.
  */
 update: function() {
   this.updatePending = false;
   var now = getTimeStamp();
   var deltaTime = now - (this.time || now);
   this.time = now;
   if (this.playing) {
     this.clearCanvas();
     if (this.tRex.jumping) {
       this.tRex.updateJump(deltaTime);
     }
     this.runningTime += deltaTime;
     var hasObstacles = this.runningTime > this.config.CLEAR_TIME;
     // First jump triggers the intro.
     if (this.tRex.jumpCount == 1 && !this.playingIntro) {
       this.playIntro();
     }
     // The horizon doesn't move until the intro is over.
     if (this.playingIntro) {
       this.horizon.update(0, this.currentSpeed, hasObstacles);
     } else {
       deltaTime = !this.activated ? 0 : deltaTime;
       this.horizon.update(deltaTime, this.currentSpeed, hasObstacles,
           this.inverted);
     }
     // Check for collisions.
     var collision = hasObstacles &&
         checkForCollision(this.horizon.obstacles[0], this.tRex);
     if (!collision) {
       this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
       if (this.currentSpeed < this.config.MAX_SPEED) {
         this.currentSpeed += this.config.ACCELERATION;
       }
     } else {
       this.gameOver();
     }
     var playAchievementSound = this.distanceMeter.update(deltaTime,
         Math.ceil(this.distanceRan));
     if (playAchievementSound) {
       this.playSound(this.soundFx.SCORE);
     }
     // Night mode.
     if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
       this.invertTimer = 0;
       this.invertTrigger = false;
       this.invert();
     } else if (this.invertTimer) {
       this.invertTimer += deltaTime;
     } else {
       var actualDistance =
           this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
       if (actualDistance > 0) {
         this.invertTrigger = !(actualDistance %
             this.config.INVERT_DISTANCE);
         if (this.invertTrigger && this.invertTimer === 0) {
           this.invertTimer += deltaTime;
           this.invert();
         }
       }
     }
   }
   if (this.playing || (!this.activated &&
       this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
     this.tRex.update(deltaTime);
     this.scheduleNextUpdate();
   }
 },
 /**
  * Event handler.
  */
 handleEvent: function(e) {
   return (function(evtType, events) {
     switch (evtType) {
       case events.KEYDOWN:
       case events.TOUCHSTART:
       case events.POINTERDOWN:
         this.onKeyDown(e);
         break;
       case events.KEYUP:
       case events.TOUCHEND:
       case events.POINTERUP:
         this.onKeyUp(e);
         break;
     }
   }.bind(this))(e.type, Runner.events);
 },
 /**
  * Bind relevant key / mouse / touch listeners.
  */
 startListening: function() {
   // Keys.
   document.addEventListener(Runner.events.KEYDOWN, this);
   document.addEventListener(Runner.events.KEYUP, this);
   // Touch / pointer.
   this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
   document.addEventListener(Runner.events.POINTERDOWN, this);
   document.addEventListener(Runner.events.POINTERUP, this);
 },
 /**
  * Remove all listeners.
  */
 stopListening: function() {
   document.removeEventListener(Runner.events.KEYDOWN, this);
   document.removeEventListener(Runner.events.KEYUP, this);
   if (this.touchController) {
     this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
     this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
   }
   this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
   document.removeEventListener(Runner.events.POINTERDOWN, this);
   document.removeEventListener(Runner.events.POINTERUP, this);
 },
 /**
  * Process keydown.
  * @param {Event} e
  */
 onKeyDown: function(e) {
   // Prevent native page scrolling whilst tapping on mobile.
   if (IS_MOBILE && this.playing) {
     e.preventDefault();
   }
   if (this.isCanvasInView()) {
     if (!this.crashed && !this.paused) {
       if (Runner.keycodes.JUMP[e.keyCode] ||
           e.type == Runner.events.TOUCHSTART) {
         e.preventDefault();
         // Starting the game for the first time.
         if (!this.playing) {
           // Started by touch so create a touch controller.
           if (!this.touchController && e.type == Runner.events.TOUCHSTART) {
             this.createTouchController();
           }
           this.loadSounds();
           this.setPlayStatus(true);
           this.update();
           if (window.errorPageController) {
             errorPageController.trackEasterEgg();
           }
         }
         // Start jump.
         if (!this.tRex.jumping && !this.tRex.ducking) {
           this.playSound(this.soundFx.BUTTON_PRESS);
           this.tRex.startJump(this.currentSpeed);
         }
       } else if (this.playing && Runner.keycodes.DUCK[e.keyCode]) {
         e.preventDefault();
         if (this.tRex.jumping) {
           // Speed drop, activated only when jump key is not pressed.
           this.tRex.setSpeedDrop();
         } else if (!this.tRex.jumping && !this.tRex.ducking) {
           // Duck.
           this.tRex.setDuck(true);
         }
       }
     // iOS only triggers touchstart and no pointer events.
     } else if (IS_IOS && this.crashed && e.type == Runner.events.TOUCHSTART &&
         e.currentTarget == this.containerEl) {
       this.handleGameOverClicks(e);
     }
   }
 },
 /**
  * Process key up.
  * @param {Event} e
  */
 onKeyUp: function(e) {
   var keyCode = String(e.keyCode);
   var isjumpKey = Runner.keycodes.JUMP[keyCode] ||
      e.type == Runner.events.TOUCHEND ||
      e.type == Runner.events.POINTERUP;
   if (this.isRunning() && isjumpKey) {
     this.tRex.endJump();
   } else if (Runner.keycodes.DUCK[keyCode]) {
     this.tRex.speedDrop = false;
     this.tRex.setDuck(false);
   } else if (this.crashed) {
     // Check that enough time has elapsed before allowing jump key to restart.
     var deltaTime = getTimeStamp() - this.time;
     if (this.isCanvasInView() &&
         (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||
         (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
         Runner.keycodes.JUMP[keyCode]))) {
       this.handleGameOverClicks(e);
     }
   } else if (this.paused && isjumpKey) {
     // Reset the jump state
     this.tRex.reset();
     this.play();
   }
 },
 /**
  * Handle interactions on the game over screen state.
  * A user is able to tap the high score twice to reset it.
  * @param {Event} e
  */
 handleGameOverClicks: function(e) {
   e.preventDefault();
   if (this.distanceMeter.hasClickedOnHighScore(e) && this.highestScore) {
     if (this.distanceMeter.isHighScoreFlashing()) {
       // Subsequent click, reset the high score.
       this.saveHighScore(0, true);
       this.distanceMeter.resetHighScore();
     } else {
       // First click, flash the high score.
       this.distanceMeter.startHighScoreFlashing();
     }
   } else {
     this.distanceMeter.cancelHighScoreFlashing();
     this.restart();
   }
 },
 /**
  * Returns whether the event was a left click on canvas.
  * On Windows right click is registered as a click.
  * @param {Event} e
  * @return {boolean}
  */
 isLeftClickOnCanvas: function(e) {
   return e.button != null && e.button < 2 &&
       e.type == Runner.events.POINTERUP && e.target == this.canvas;
 },
 /**
  * RequestAnimationFrame wrapper.
  */
 scheduleNextUpdate: function() {
   if (!this.updatePending) {
     this.updatePending = true;
     this.raqId = requestAnimationFrame(this.update.bind(this));
   }
 },
 /**
  * Whether the game is running.
  * @return {boolean}
  */
 isRunning: function() {
   return !!this.raqId;
 },
 /**
  * Set the initial high score as stored in the user's profile.
  * @param {integer} highScore
  */
 initializeHighScore: function(highScore) {
   this.syncHighestScore = true;
   highScore = Math.ceil(highScore);
   if (highScore < this.highestScore) {
     if (window.errorPageController) {
       errorPageController.updateEasterEggHighScore(this.highestScore);
     }
     return;
   }
   this.highestScore = highScore;
   this.distanceMeter.setHighScore(this.highestScore);
 },
 /**
  * Sets the current high score and saves to the profile if available.
  * @param {number} distanceRan Total distance ran.
  * @param {boolean} opt_resetScore Whether to reset the score.
  */
 saveHighScore: function(distanceRan, opt_resetScore) {
   this.highestScore = Math.ceil(distanceRan);
   this.distanceMeter.setHighScore(this.highestScore);
   // Store the new high score in the profile.
   if (this.syncHighestScore && window.errorPageController) {
     if (opt_resetScore) {
       errorPageController.resetEasterEggHighScore();
     } else {
       errorPageController.updateEasterEggHighScore(this.highestScore);
     }
   }
 },
 /**
  * Game over state.
  */
 gameOver: function() {
   this.playSound(this.soundFx.HIT);
   vibrate(200);
   this.stop();
   this.crashed = true;
   this.distanceMeter.achievement = false;
   this.tRex.update(100, Trex.status.CRASHED);
   // Game over panel.
   if (!this.gameOverPanel) {
     this.gameOverPanel = new GameOverPanel(this.canvas,
         this.spriteDef.TEXT_SPRITE, this.spriteDef.RESTART,
         this.dimensions);
   } else {
     this.gameOverPanel.draw();
   }
   // Update the high score.
   if (this.distanceRan > this.highestScore) {
     this.saveHighScore(this.distanceRan);
   }
   // Reset the time clock.
   this.time = getTimeStamp();
 },
 stop: function() {
   this.setPlayStatus(false);
   this.paused = true;
   cancelAnimationFrame(this.raqId);
   this.raqId = 0;
 },
 play: function() {
   if (!this.crashed) {
     this.setPlayStatus(true);
     this.paused = false;
     this.tRex.update(0, Trex.status.RUNNING);
     this.time = getTimeStamp();
     this.update();
   }
 },
 restart: function() {
   if (!this.raqId) {
     this.playCount++;
     this.runningTime = 0;
     this.setPlayStatus(true);
     this.paused = false;
     this.crashed = false;
     this.distanceRan = 0;
     this.setSpeed(this.config.SPEED);
     this.time = getTimeStamp();
     this.containerEl.classList.remove(Runner.classes.CRASHED);
     this.clearCanvas();
     this.distanceMeter.reset(this.highestScore);
     this.horizon.reset();
     this.tRex.reset();
     this.playSound(this.soundFx.BUTTON_PRESS);
     this.invert(true);
     this.bdayFlashTimer = null;
     this.update();
   }
 },
 setPlayStatus: function(isPlaying) {
   if (this.touchController)
     this.touchController.classList.toggle(HIDDEN_CLASS, !isPlaying);
   this.playing = isPlaying;
 },
 /**
  * Whether the game should go into arcade mode.
  * @return {boolean}
  */
 isArcadeMode: function() {
   return document.title == ARCADE_MODE_URL;
 },
 /**
  * Hides offline messaging for a fullscreen game only experience.
  */
 setArcadeMode: function() {
   document.body.classList.add(Runner.classes.ARCADE_MODE);
   this.setArcadeModeContainerScale();
 },
 /**
  * Sets the scaling for arcade mode.
  */
 setArcadeModeContainerScale: function() {
   var windowHeight = window.innerHeight;
   var scaleHeight = windowHeight / this.dimensions.HEIGHT;
   var scaleWidth = window.innerWidth / this.dimensions.WIDTH;
   var scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
   var scaledCanvasHeight = this.dimensions.HEIGHT * scale;
   // Positions the game container at 10% of the available vertical window
   // height minus the game container height.
   var translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
       Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
       Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
       window.devicePixelRatio;
   this.containerEl.style.transform = 'scale(' + scale + ') translateY(' +
       translateY + 'px)';
 },
 /**
  * Pause the game if the tab is not in focus.
  */
 onVisibilityChange: function(e) {
   if (document.hidden || document.webkitHidden || e.type == 'blur' ||
     document.visibilityState != 'visible') {
     this.stop();
   } else if (!this.crashed) {
     this.tRex.reset();
     this.play();
   }
 },
 /**
  * Play a sound.
  * @param {SoundBuffer} soundBuffer
  */
 playSound: function(soundBuffer) {
   if (soundBuffer) {
     var sourceNode = this.audioContext.createBufferSource();
     sourceNode.buffer = soundBuffer;
     sourceNode.connect(this.audioContext.destination);
     sourceNode.start(0);
   }
 },
 /**
  * Inverts the current page / canvas colors.
  * @param {boolean} Whether to reset colors.
  */
 invert: function(reset) {
   let htmlEl = document.firstElementChild;
   if (reset) {
     htmlEl.classList.toggle(Runner.classes.INVERTED,
         false);
     this.invertTimer = 0;
     this.inverted = false;
   } else {
     this.inverted = htmlEl.classList.toggle(
         Runner.classes.INVERTED, this.invertTrigger);
   }
 }

};


/**

* Updates the canvas size taking into
* account the backing store pixel ratio and
* the device pixel ratio.
*
 * See article by Paul Lewis:
* http://www.html5rocks.com/en/tutorials/canvas/hidpi/
*
 * @param {HTMLCanvasElement} canvas
* @param {number} opt_width
* @param {number} opt_height
* @return {boolean} Whether the canvas was scaled.
*/

Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {

 var context = canvas.getContext('2d');
 // Query the various pixel ratios
 var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
 var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;
 var ratio = devicePixelRatio / backingStoreRatio;
 // Upscale the canvas if the two ratios don't match
 if (devicePixelRatio !== backingStoreRatio) {
   var oldWidth = opt_width || canvas.width;
   var oldHeight = opt_height || canvas.height;
   canvas.width = oldWidth * ratio;
   canvas.height = oldHeight * ratio;
   canvas.style.width = oldWidth + 'px';
   canvas.style.height = oldHeight + 'px';
   // Scale the context to counter the fact that we've manually scaled
   // our canvas element.
   context.scale(ratio, ratio);
   return true;
 } else if (devicePixelRatio == 1) {
   // Reset the canvas width / height. Fixes scaling bug when the page is
   // zoomed and the devicePixelRatio changes accordingly.
   canvas.style.width = canvas.width + 'px';
   canvas.style.height = canvas.height + 'px';
 }
 return false;

};


/**

* Get random number.
* @param {number} min
* @param {number} max
* @param {number}
*/

function getRandomNum(min, max) {

 return Math.floor(Math.random() * (max - min + 1)) + min;

}


/**

* Vibrate on mobile devices.
* @param {number} duration Duration of the vibration in milliseconds.
*/

function vibrate(duration) {

 if (IS_MOBILE && window.navigator.vibrate) {
   window.navigator.vibrate(duration);
 }

}


/**

* Create canvas element.
* @param {HTMLElement} container Element to append canvas to.
* @param {number} width
* @param {number} height
* @param {string} opt_classname
* @return {HTMLCanvasElement}
*/

function createCanvas(container, width, height, opt_classname) {

 var canvas = document.createElement('canvas');
 canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
     opt_classname : Runner.classes.CANVAS;
 canvas.width = width;
 canvas.height = height;
 container.appendChild(canvas);
 return canvas;

}


/**

* Decodes the base 64 audio to ArrayBuffer used by Web Audio.
* @param {string} base64String
*/

function decodeBase64ToArrayBuffer(base64String) {

 var len = (base64String.length / 4) * 3;
 var str = atob(base64String);
 var arrayBuffer = new ArrayBuffer(len);
 var bytes = new Uint8Array(arrayBuffer);
 for (var i = 0; i < len; i++) {
   bytes[i] = str.charCodeAt(i);
 }
 return bytes.buffer;

}


/**

* Return the current timestamp.
* @return {number}
*/

function getTimeStamp() {

 return IS_IOS ? new Date().getTime() : performance.now();

}


//******************************************************************************


/**

* Game over panel.
* @param {!HTMLCanvasElement} canvas
* @param {Object} textImgPos
* @param {Object} restartImgPos
* @param {!Object} dimensions Canvas dimensions.
* @constructor
 */

function GameOverPanel(canvas, textImgPos, restartImgPos, dimensions) {

 this.canvas = canvas;
 this.canvasCtx = canvas.getContext('2d');
 this.canvasDimensions = dimensions;
 this.textImgPos = textImgPos;
 this.restartImgPos = restartImgPos;
 this.draw();

};


/**

* Dimensions used in the panel.
* @enum {number}
*/

GameOverPanel.dimensions = {

 TEXT_X: 0,
 TEXT_Y: 13,
 TEXT_WIDTH: 191,
 TEXT_HEIGHT: 11,
 RESTART_WIDTH: 36,
 RESTART_HEIGHT: 32

};


GameOverPanel.prototype = {

 /**
  * Update the panel dimensions.
  * @param {number} width New canvas width.
  * @param {number} opt_height Optional new canvas height.
  */
 updateDimensions: function(width, opt_height) {
   this.canvasDimensions.WIDTH = width;
   if (opt_height) {
     this.canvasDimensions.HEIGHT = opt_height;
   }
 },
 /**
  * Draw the panel.
  */
 draw: function() {
   var dimensions = GameOverPanel.dimensions;
   var centerX = this.canvasDimensions.WIDTH / 2;
   // Game over text.
   var textSourceX = dimensions.TEXT_X;
   var textSourceY = dimensions.TEXT_Y;
   var textSourceWidth = dimensions.TEXT_WIDTH;
   var textSourceHeight = dimensions.TEXT_HEIGHT;
   var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
   var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
   var textTargetWidth = dimensions.TEXT_WIDTH;
   var textTargetHeight = dimensions.TEXT_HEIGHT;
   var restartSourceWidth = dimensions.RESTART_WIDTH;
   var restartSourceHeight = dimensions.RESTART_HEIGHT;
   var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);
   var restartTargetY = this.canvasDimensions.HEIGHT / 2;
   if (IS_HIDPI) {
     textSourceY *= 2;
     textSourceX *= 2;
     textSourceWidth *= 2;
     textSourceHeight *= 2;
     restartSourceWidth *= 2;
     restartSourceHeight *= 2;
   }
   textSourceX += this.textImgPos.x;
   textSourceY += this.textImgPos.y;
   // Game over text from sprite.
   this.canvasCtx.drawImage(Runner.imageSprite,
       textSourceX, textSourceY, textSourceWidth, textSourceHeight,
       textTargetX, textTargetY, textTargetWidth, textTargetHeight);
   // Restart button.
   this.canvasCtx.drawImage(Runner.imageSprite,
       this.restartImgPos.x, this.restartImgPos.y,
       restartSourceWidth, restartSourceHeight,
       restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
       dimensions.RESTART_HEIGHT);
 }

};


//******************************************************************************

/**

* Check for a collision.
* @param {!Obstacle} obstacle
* @param {!Trex} tRex T-rex object.
* @param {HTMLCanvasContext} opt_canvasCtx Optional canvas context for drawing
*    collision boxes.
* @return {Array<CollisionBox>}
*/

function checkForCollision(obstacle, tRex, opt_canvasCtx) {

 var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;
 // Adjustments are made to the bounding box as there is a 1 pixel white
 // border around the t-rex and obstacles.
 var tRexBox = new CollisionBox(
     tRex.xPos + 1,
     tRex.yPos + 1,
     tRex.config.WIDTH - 2,
     tRex.config.HEIGHT - 2);
 var obstacleBox = new CollisionBox(
     obstacle.xPos + 1,
     obstacle.yPos + 1,
     obstacle.typeConfig.width * obstacle.size - 2,
     obstacle.typeConfig.height - 2);
 // Debug outer box
 if (opt_canvasCtx) {
   drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
 }
 // Simple outer bounds check.
 if (boxCompare(tRexBox, obstacleBox)) {
   var collisionBoxes = obstacle.collisionBoxes;
   var tRexCollisionBoxes = tRex.ducking ?
       Trex.collisionBoxes.DUCKING : Trex.collisionBoxes.RUNNING;
   // Detailed axis aligned box check.
   for (var t = 0; t < tRexCollisionBoxes.length; t++) {
     for (var i = 0; i < collisionBoxes.length; i++) {
       // Adjust the box to actual positions.
       var adjTrexBox =
           createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
       var adjObstacleBox =
           createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
       var crashed = boxCompare(adjTrexBox, adjObstacleBox);
       // Draw boxes for debug.
       if (opt_canvasCtx) {
         drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
       }
       if (crashed) {
         return [adjTrexBox, adjObstacleBox];
       }
     }
   }
 }
 return false;

};


/**

* Adjust the collision box.
* @param {!CollisionBox} box The original box.
* @param {!CollisionBox} adjustment Adjustment box.
* @return {CollisionBox} The adjusted collision box object.
*/

function createAdjustedCollisionBox(box, adjustment) {

 return new CollisionBox(
     box.x + adjustment.x,
     box.y + adjustment.y,
     box.width,
     box.height);

};


/**

* Draw the collision boxes for debug.
*/

function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {

 canvasCtx.save();
 canvasCtx.strokeStyle = '#f00';
 canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
 canvasCtx.strokeStyle = '#0f0';
 canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
     obstacleBox.width, obstacleBox.height);
 canvasCtx.restore();

};


/**

* Compare two collision boxes for a collision.
* @param {CollisionBox} tRexBox
* @param {CollisionBox} obstacleBox
* @return {boolean} Whether the boxes intersected.
*/

function boxCompare(tRexBox, obstacleBox) {

 var crashed = false;
 var tRexBoxX = tRexBox.x;
 var tRexBoxY = tRexBox.y;
 var obstacleBoxX = obstacleBox.x;
 var obstacleBoxY = obstacleBox.y;
 // Axis-Aligned Bounding Box method.
 if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
     tRexBox.x + tRexBox.width > obstacleBoxX &&
     tRexBox.y < obstacleBox.y + obstacleBox.height &&
     tRexBox.height + tRexBox.y > obstacleBox.y) {
   crashed = true;
 }
 return crashed;

};


//******************************************************************************

/**

* Collision box object.
* @param {number} x X position.
* @param {number} y Y Position.
* @param {number} w Width.
* @param {number} h Height.
*/

function CollisionBox(x, y, w, h) {

 this.x = x;
 this.y = y;
 this.width = w;
 this.height = h;

};


//******************************************************************************

/**

* Obstacle.
* @param {HTMLCanvasCtx} canvasCtx
* @param {Obstacle.type} type
* @param {Object} spritePos Obstacle position in sprite.
* @param {Object} dimensions
* @param {number} gapCoefficient Mutipler in determining the gap.
* @param {number} speed
* @param {number} opt_xOffset
*/

function Obstacle(canvasCtx, type, spriteImgPos, dimensions,

   gapCoefficient, speed, opt_xOffset) {
 this.canvasCtx = canvasCtx;
 this.spritePos = spriteImgPos;
 this.typeConfig = type;
 this.gapCoefficient = gapCoefficient;
 this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
 this.dimensions = dimensions;
 this.remove = false;
 this.xPos = dimensions.WIDTH + (opt_xOffset || 0);
 this.yPos = 0;
 this.width = 0;
 this.collisionBoxes = [];
 this.gap = 0;
 this.speedOffset = 0;
 // For animated obstacles.
 this.currentFrame = 0;
 this.timer = 0;
 this.init(speed);

};

/**

* Coefficient for calculating the maximum gap.
* @const
 */

Obstacle.MAX_GAP_COEFFICIENT = 1.5;

/**

* Maximum obstacle grouping count.
* @const
 */

Obstacle.MAX_OBSTACLE_LENGTH = 3,


Obstacle.prototype = {

 /**
  * Initialise the DOM for the obstacle.
  * @param {number} speed
  */
 init: function(speed) {
   this.cloneCollisionBoxes();
   // Only allow sizing if we're at the right speed.
   if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
     this.size = 1;
   }
   this.width = this.typeConfig.width * this.size;
   // Check if obstacle can be positioned at various heights.
   if (Array.isArray(this.typeConfig.yPos))  {
     var yPosConfig = IS_MOBILE ? this.typeConfig.yPosMobile :
         this.typeConfig.yPos;
     this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];
   } else {
     this.yPos = this.typeConfig.yPos;
   }
   this.draw();
   // Make collision box adjustments,
   // Central box is adjusted to the size as one box.
   //      ____        ______        ________
   //    _|   |-|    _|     |-|    _|       |-|
   //   | |<->| |   | |<--->| |   | |<----->| |
   //   | | 1 | |   | |  2  | |   | |   3   | |
   //   |_|___|_|   |_|_____|_|   |_|_______|_|
   //
   if (this.size > 1) {
     this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
         this.collisionBoxes[2].width;
     this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
   }
   // For obstacles that go at a different speed from the horizon.
   if (this.typeConfig.speedOffset) {
     this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :
         -this.typeConfig.speedOffset;
   }
   this.gap = this.getGap(this.gapCoefficient, speed);
 },
 /**
  * Draw and crop based on size.
  */
 draw: function() {
   var sourceWidth = this.typeConfig.width;
   var sourceHeight = this.typeConfig.height;
   if (IS_HIDPI) {
     sourceWidth = sourceWidth * 2;
     sourceHeight = sourceHeight * 2;
   }
   // X position in sprite.
   var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1)) +
       this.spritePos.x;
   // Animation frames.
   if (this.currentFrame > 0) {
     sourceX += sourceWidth * this.currentFrame;
   }
   this.canvasCtx.drawImage(Runner.imageSprite,
     sourceX, this.spritePos.y,
     sourceWidth * this.size, sourceHeight,
     this.xPos, this.yPos,
     this.typeConfig.width * this.size, this.typeConfig.height);
 },
 /**
  * Obstacle frame update.
  * @param {number} deltaTime
  * @param {number} speed
  */
 update: function(deltaTime, speed) {
   if (!this.remove) {
     if (this.typeConfig.speedOffset) {
       speed += this.speedOffset;
     }
     this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
     // Update frame
     if (this.typeConfig.numFrames) {
       this.timer += deltaTime;
       if (this.timer >= this.typeConfig.frameRate) {
         this.currentFrame =
             this.currentFrame == this.typeConfig.numFrames - 1 ?
             0 : this.currentFrame + 1;
         this.timer = 0;
       }
     }
     this.draw();
     if (!this.isVisible()) {
       this.remove = true;
     }
   }
 },
 /**
  * Calculate a random gap size.
  * - Minimum gap gets wider as speed increses
  * @param {number} gapCoefficient
  * @param {number} speed
  * @return {number} The gap size.
  */
 getGap: function(gapCoefficient, speed) {
   var minGap = Math.round(this.width * speed +
         this.typeConfig.minGap * gapCoefficient);
   var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
   return getRandomNum(minGap, maxGap);
 },
 /**
  * Check if obstacle is visible.
  * @return {boolean} Whether the obstacle is in the game area.
  */
 isVisible: function() {
   return this.xPos + this.width > 0;
 },
 /**
  * Make a copy of the collision boxes, since these will change based on
  * obstacle type and size.
  */
 cloneCollisionBoxes: function() {
   var collisionBoxes = this.typeConfig.collisionBoxes;
   for (var i = collisionBoxes.length - 1; i >= 0; i--) {
     this.collisionBoxes[i] = new CollisionBox(collisionBoxes[i].x,
         collisionBoxes[i].y, collisionBoxes[i].width,
         collisionBoxes[i].height);
   }
 }

};


/**

* Obstacle definitions.
* minGap: minimum pixel space betweeen obstacles.
* multipleSpeed: Speed at which multiples are allowed.
* speedOffset: speed faster / slower than the horizon.
* minSpeed: Minimum speed which the obstacle can make an appearance.
*/

Obstacle.types = [

 {
   type: 'CACTUS_SMALL',
   width: 17,
   height: 35,
   yPos: 105,
   multipleSpeed: 4,
   minGap: 120,
   minSpeed: 0,
   collisionBoxes: [
     new CollisionBox(0, 7, 5, 27),
     new CollisionBox(4, 0, 6, 34),
     new CollisionBox(10, 4, 7, 14)
   ]
 },
 {
   type: 'CACTUS_LARGE',
   width: 25,
   height: 50,
   yPos: 90,
   multipleSpeed: 7,
   minGap: 120,
   minSpeed: 0,
   collisionBoxes: [
     new CollisionBox(0, 12, 7, 38),
     new CollisionBox(8, 0, 7, 49),
     new CollisionBox(13, 10, 10, 38)
   ]
 },
 {
   type: 'PTERODACTYL',
   width: 46,
   height: 40,
   yPos: [ 100, 75, 50 ], // Variable height.
   yPosMobile: [ 100, 50 ], // Variable height mobile.
   multipleSpeed: 999,
   minSpeed: 8.5,
   minGap: 150,
   collisionBoxes: [
     new CollisionBox(15, 15, 16, 5),
     new CollisionBox(18, 21, 24, 6),
     new CollisionBox(2, 14, 4, 3),
     new CollisionBox(6, 10, 4, 7),
     new CollisionBox(10, 8, 6, 9)
   ],
   numFrames: 2,
   frameRate: 1000/6,
   speedOffset: .8
 }

];


//****************************************************************************** /**

* T-rex game character.
* @param {HTMLCanvas} canvas
* @param {Object} spritePos Positioning within image sprite.
* @constructor
 */

function Trex(canvas, spritePos) {

 this.canvas = canvas;
 this.canvasCtx = canvas.getContext('2d');
 this.spritePos = spritePos;
 this.xPos = 0;
 this.yPos = 0;
 this.xInitialPos = 0;
 // Position when on the ground.
 this.groundYPos = 0;
 this.currentFrame = 0;
 this.currentAnimFrames = [];
 this.blinkDelay = 0;
 this.blinkCount = 0;
 this.animStartTime = 0;
 this.timer = 0;
 this.msPerFrame = 1000 / FPS;
 this.config = Trex.config;
 // Current status.
 this.status = Trex.status.WAITING;
 this.jumping = false;
 this.ducking = false;
 this.jumpVelocity = 0;
 this.reachedMinHeight = false;
 this.speedDrop = false;
 this.jumpCount = 0;
 this.jumpspotX = 0;
 this.init();

};


/**

* T-rex player config.
* @enum {number}
*/

Trex.config = {

 DROP_VELOCITY: -5,
 GRAVITY: 0.6,
 HEIGHT: 47,
 HEIGHT_DUCK: 25,
 INIITAL_JUMP_VELOCITY: -10,
 INTRO_DURATION: 1500,
 MAX_JUMP_HEIGHT: 30,
 MIN_JUMP_HEIGHT: 30,
 SPEED_DROP_COEFFICIENT: 3,
 SPRITE_WIDTH: 262,
 START_X_POS: 50,
 WIDTH: 44,
 WIDTH_DUCK: 59

};


/**

* Used in collision detection.
* @type {Array<CollisionBox>}
*/

Trex.collisionBoxes = {

 DUCKING: [
   new CollisionBox(1, 18, 55, 25)
 ],
 RUNNING: [
   new CollisionBox(22, 0, 17, 16),
   new CollisionBox(1, 18, 30, 9),
   new CollisionBox(10, 35, 14, 8),
   new CollisionBox(1, 24, 29, 5),
   new CollisionBox(5, 30, 21, 4),
   new CollisionBox(9, 34, 15, 4)
 ]

};


/**

* Animation states.
* @enum {string}
*/

Trex.status = {

 CRASHED: 'CRASHED',
 DUCKING: 'DUCKING',
 JUMPING: 'JUMPING',
 RUNNING: 'RUNNING',
 WAITING: 'WAITING'

};

/**

* Blinking coefficient.
* @const
 */

Trex.BLINK_TIMING = 7000;


/**

* Animation config for different states.
* @enum {Object}
*/

Trex.animFrames = {

 WAITING: {
   frames: [44, 0],
   msPerFrame: 1000 / 3
 },
 RUNNING: {
   frames: [88, 132],
   msPerFrame: 1000 / 12
 },
 CRASHED: {
   frames: [220],
   msPerFrame: 1000 / 60
 },
 JUMPING: {
   frames: [0],
   msPerFrame: 1000 / 60
 },
 DUCKING: {
   frames: [264, 323],
   msPerFrame: 1000 / 8
 }

};


Trex.prototype = {

 /**
  * T-rex player initaliser.
  * Sets the t-rex to blink at random intervals.
  */
 init: function() {
   this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
       Runner.config.BOTTOM_PAD;
   this.yPos = this.groundYPos;
   this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
   this.draw(0, 0);
   this.update(0, Trex.status.WAITING);
 },
 /**
  * Setter for the jump velocity.
  * The approriate drop velocity is also set.
  */
 setJumpVelocity: function(setting) {
   this.config.INIITAL_JUMP_VELOCITY = -setting;
   this.config.DROP_VELOCITY = -setting / 2;
 },
 /**
  * Set the animation status.
  * @param {!number} deltaTime
  * @param {Trex.status} status Optional status to switch to.
  */
 update: function(deltaTime, opt_status) {
   this.timer += deltaTime;
   // Update the status.
   if (opt_status) {
     this.status = opt_status;
     this.currentFrame = 0;
     this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
     this.currentAnimFrames = Trex.animFrames[opt_status].frames;
     if (opt_status == Trex.status.WAITING) {
       this.animStartTime = getTimeStamp();
       this.setBlinkDelay();
     }
   }
   // Game intro animation, T-rex moves in from the left.
   if (this.playingIntro && this.xPos < this.config.START_X_POS) {
     this.xPos += Math.round((this.config.START_X_POS /
         this.config.INTRO_DURATION) * deltaTime);
     this.xInitialPos = this.xPos;
   }
   if (this.status == Trex.status.WAITING) {
     this.blink(getTimeStamp());
   } else {
     this.draw(this.currentAnimFrames[this.currentFrame], 0);
   }
   // Update the frame position.
   if (this.timer >= this.msPerFrame) {
     this.currentFrame = this.currentFrame ==
         this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
     this.timer = 0;
   }
   // Speed drop becomes duck if the down key is still being pressed.
   if (this.speedDrop && this.yPos == this.groundYPos) {
     this.speedDrop = false;
     this.setDuck(true);
   }
 },
 /**
  * Draw the t-rex to a particular position.
  * @param {number} x
  * @param {number} y
  */
 draw: function(x, y) {
   var sourceX = x;
   var sourceY = y;
   var sourceWidth = this.ducking && this.status != Trex.status.CRASHED ?
       this.config.WIDTH_DUCK : this.config.WIDTH;
   var sourceHeight = this.config.HEIGHT;
   var outputHeight = sourceHeight;
   if (IS_HIDPI) {
     sourceX *= 2;
     sourceY *= 2;
     sourceWidth *= 2;
     sourceHeight *= 2;
   }
   // Adjustments for sprite sheet position.
   sourceX += this.spritePos.x;
   sourceY += this.spritePos.y;
   // Ducking.
   if (this.ducking && this.status != Trex.status.CRASHED) {
     this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
         sourceWidth, sourceHeight,
         this.xPos, this.yPos,
         this.config.WIDTH_DUCK, outputHeight);
   } else {
     // Crashed whilst ducking. Trex is standing up so needs adjustment.
     if (this.ducking && this.status == Trex.status.CRASHED) {
       this.xPos++;
     }
     // Standing / running
     this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
         sourceWidth, sourceHeight,
         this.xPos, this.yPos,
         this.config.WIDTH, outputHeight);
   }
   this.canvasCtx.globalAlpha = 1;
 },
 /**
  * Sets a random time for the blink to happen.
  */
 setBlinkDelay: function() {
   this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
 },
 /**
  * Make t-rex blink at random intervals.
  * @param {number} time Current time in milliseconds.
  */
 blink: function(time) {
   var deltaTime = time - this.animStartTime;
   if (deltaTime >= this.blinkDelay) {
     this.draw(this.currentAnimFrames[this.currentFrame], 0);
     if (this.currentFrame == 1) {
       // Set new random delay to blink.
       this.setBlinkDelay();
       this.animStartTime = time;
       this.blinkCount++;
     }
   }
 },
 /**
  * Initialise a jump.
  * @param {number} speed
  */
 startJump: function(speed) {
   if (!this.jumping) {
     this.update(0, Trex.status.JUMPING);
     // Tweak the jump velocity based on the speed.
     this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY - (speed / 10);
     this.jumping = true;
     this.reachedMinHeight = false;
     this.speedDrop = false;
   }
 },
 /**
  * Jump is complete, falling down.
  */
 endJump: function() {
   if (this.reachedMinHeight &&
       this.jumpVelocity < this.config.DROP_VELOCITY) {
     this.jumpVelocity = this.config.DROP_VELOCITY;
   }
 },
 /**
  * Update frame for a jump.
  * @param {number} deltaTime
  * @param {number} speed
  */
 updateJump: function(deltaTime, speed) {
   var msPerFrame = Trex.animFrames[this.status].msPerFrame;
   var framesElapsed = deltaTime / msPerFrame;
   // Speed drop makes Trex fall faster.
   if (this.speedDrop) {
     this.yPos += Math.round(this.jumpVelocity *
         this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
   } else {
     this.yPos += Math.round(this.jumpVelocity * framesElapsed);
   }
   this.jumpVelocity += this.config.GRAVITY * framesElapsed;
   // Minimum height has been reached.
   if (this.yPos < this.minJumpHeight || this.speedDrop) {
     this.reachedMinHeight = true;
   }
   // Reached max height
   if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {
     this.endJump();
   }
   // Back down at ground level. Jump completed.
   if (this.yPos > this.groundYPos) {
     this.reset();
     this.jumpCount++;
   }
 },
 /**
  * Set the speed drop. Immediately cancels the current jump.
  */
 setSpeedDrop: function() {
   this.speedDrop = true;
   this.jumpVelocity = 1;
 },
 /**
  * @param {boolean} isDucking.
  */
 setDuck: function(isDucking) {
   if (isDucking && this.status != Trex.status.DUCKING) {
     this.update(0, Trex.status.DUCKING);
     this.ducking = true;
   } else if (this.status == Trex.status.DUCKING) {
     this.update(0, Trex.status.RUNNING);
     this.ducking = false;
   }
 },
 /**
  * Reset the t-rex to running at start of game.
  */
 reset: function() {
   this.xPos = this.xInitialPos;
   this.yPos = this.groundYPos;
   this.jumpVelocity = 0;
   this.jumping = false;
   this.ducking = false;
   this.update(0, Trex.status.RUNNING);
   this.midair = false;
   this.speedDrop = false;
   this.jumpCount = 0;
 }

};


//******************************************************************************

/**

* Handles displaying the distance meter.
* @param {!HTMLCanvasElement} canvas
* @param {Object} spritePos Image position in sprite.
* @param {number} canvasWidth
* @constructor
 */

function DistanceMeter(canvas, spritePos, canvasWidth) {

 this.canvas = canvas;
 this.canvasCtx = canvas.getContext('2d');
 this.image = Runner.imageSprite;
 this.spritePos = spritePos;
 this.x = 0;
 this.y = 5;
 this.currentDistance = 0;
 this.maxScore = 0;
 this.highScore = 0;
 this.container = null;
 this.digits = [];
 this.achievement = false;
 this.defaultString = ;
 this.flashTimer = 0;
 this.flashIterations = 0;
 this.invertTrigger = false;
 this.flashingRafId = null;
 this.highScoreBounds = {};
 this.highScoreFlashing = false;
 this.config = DistanceMeter.config;
 this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
 this.init(canvasWidth);

};


/**

* @enum {number}
*/

DistanceMeter.dimensions = {

 WIDTH: 10,
 HEIGHT: 13,
 DEST_WIDTH: 11

};


/**

* Y positioning of the digits in the sprite sheet.
* X position is always 0.
* @type {Array<number>}
*/

DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];


/**

* Distance meter config.
* @enum {number}
*/

DistanceMeter.config = {

 // Number of digits.
 MAX_DISTANCE_UNITS: 5,
 // Distance that causes achievement animation.
 ACHIEVEMENT_DISTANCE: 100,
 // Used for conversion from pixel distance to a scaled unit.
 COEFFICIENT: 0.025,
 // Flash duration in milliseconds.
 FLASH_DURATION: 1000 / 4,
 // Flash iterations for achievement animation.
 FLASH_ITERATIONS: 3,
 // Padding around the high score hit area.
 HIGH_SCORE_HIT_AREA_PADDING: 4

};


DistanceMeter.prototype = {

 /**
  * Initialise the distance meter to '00000'.
  * @param {number} width Canvas width in px.
  */
 init: function(width) {
   var maxDistanceStr = ;
   this.calcXPos(width);
   this.maxScore = this.maxScoreUnits;
   for (var i = 0; i < this.maxScoreUnits; i++) {
     this.draw(i, 0);
     this.defaultString += '0';
     maxDistanceStr += '9';
   }
   this.maxScore = parseInt(maxDistanceStr);
 },
 /**
  * Calculate the xPos in the canvas.
  * @param {number} canvasWidth
  */
 calcXPos: function(canvasWidth) {
   this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
       (this.maxScoreUnits + 1));
 },
 /**
  * Draw a digit to canvas.
  * @param {number} digitPos Position of the digit.
  * @param {number} value Digit value 0-9.
  * @param {boolean} opt_highScore Whether drawing the high score.
  */
 draw: function(digitPos, value, opt_highScore) {
   var sourceWidth = DistanceMeter.dimensions.WIDTH;
   var sourceHeight = DistanceMeter.dimensions.HEIGHT;
   var sourceX = DistanceMeter.dimensions.WIDTH * value;
   var sourceY = 0;
   var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
   var targetY = this.y;
   var targetWidth = DistanceMeter.dimensions.WIDTH;
   var targetHeight = DistanceMeter.dimensions.HEIGHT;
   // For high DPI we 2x source values.
   if (IS_HIDPI) {
     sourceWidth *= 2;
     sourceHeight *= 2;
     sourceX *= 2;
   }
   sourceX += this.spritePos.x;
   sourceY += this.spritePos.y;
   this.canvasCtx.save();
   if (opt_highScore) {
     // Left of the current score.
     var highScoreX = this.x - (this.maxScoreUnits * 2) *
         DistanceMeter.dimensions.WIDTH;
     this.canvasCtx.translate(highScoreX, this.y);
   } else {
     this.canvasCtx.translate(this.x, this.y);
   }
   this.canvasCtx.drawImage(this.image, sourceX, sourceY,
       sourceWidth, sourceHeight,
       targetX, targetY,
       targetWidth, targetHeight
     );
   this.canvasCtx.restore();
 },
 /**
  * Covert pixel distance to a 'real' distance.
  * @param {number} distance Pixel distance ran.
  * @return {number} The 'real' distance ran.
  */
 getActualDistance: function(distance) {
   return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;
 },
 /**
  * Update the distance meter.
  * @param {number} distance
  * @param {number} deltaTime
  * @return {boolean} Whether the acheivement sound fx should be played.
  */
 update: function(deltaTime, distance) {
   var paint = true;
   var playSound = false;
   if (!this.achievement) {
     distance = this.getActualDistance(distance);
     // Score has gone beyond the initial digit count.
     if (distance > this.maxScore && this.maxScoreUnits ==
       this.config.MAX_DISTANCE_UNITS) {
       this.maxScoreUnits++;
       this.maxScore = parseInt(this.maxScore + '9');
     } else {
       this.distance = 0;
     }
     if (distance > 0) {
       // Acheivement unlocked
       if (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {
         // Flash score and play sound.
         this.achievement = true;
         this.flashTimer = 0;
         playSound = true;
       }
       // Create a string representation of the distance with leading 0.
       var distanceStr = (this.defaultString +
           distance).substr(-this.maxScoreUnits);
       this.digits = distanceStr.split();
     } else {
       this.digits = this.defaultString.split();
     }
   } else {
     // Control flashing of the score on reaching acheivement.
     if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
       this.flashTimer += deltaTime;
       if (this.flashTimer < this.config.FLASH_DURATION) {
         paint = false;
       } else if (this.flashTimer >
           this.config.FLASH_DURATION * 2) {
         this.flashTimer = 0;
         this.flashIterations++;
       }
     } else {
       this.achievement = false;
       this.flashIterations = 0;
       this.flashTimer = 0;
     }
   }
   // Draw the digits if not flashing.
   if (paint) {
     for (var i = this.digits.length - 1; i >= 0; i--) {
       this.draw(i, parseInt(this.digits[i]));
     }
   }
   this.drawHighScore();
   return playSound;
 },
 /**
  * Draw the high score.
  */
 drawHighScore: function() {
   this.canvasCtx.save();
   this.canvasCtx.globalAlpha = .8;
   for (var i = this.highScore.length - 1; i >= 0; i--) {
     this.draw(i, parseInt(this.highScore[i], 10), true);
   }
   this.canvasCtx.restore();
 },
 /**
  * Set the highscore as a array string.
  * Position of char in the sprite: H - 10, I - 11.
  * @param {number} distance Distance ran in pixels.
  */
 setHighScore: function(distance) {
   distance = this.getActualDistance(distance);
   var highScoreStr = (this.defaultString +
       distance).substr(-this.maxScoreUnits);
   this.highScore = ['10', '11', ].concat(highScoreStr.split());
 },


 /**
  * Whether a clicked is in the high score area.
  * @param {TouchEvent|ClickEvent} e Event object.
  * @return {boolean} Whether the click was in the high score bounds.
  */
 hasClickedOnHighScore: function(e) {
   var x = 0;
   var y = 0;
   if (e.touches) {
     // Bounds for touch differ from pointer.
     var canvasBounds = this.canvas.getBoundingClientRect();
     x = e.touches[0].clientX - canvasBounds.left;
     y = e.touches[0].clientY - canvasBounds.top;
   } else {
     x = e.offsetX;
     y = e.offsetY;
   }
   this.highScoreBounds = this.getHighScoreBounds();
   return x >= this.highScoreBounds.x && x <=
       this.highScoreBounds.x + this.highScoreBounds.width &&
       y >= this.highScoreBounds.y && y <=
       this.highScoreBounds.y + this.highScoreBounds.height;
 },
 /**
  * Get the bounding box for the high score.
  * @return {Object} Object with x, y, width and height properties.
  */
 getHighScoreBounds: function() {
   return {
     x: (this.x - (this.maxScoreUnits * 2) *
         DistanceMeter.dimensions.WIDTH) -
         DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
     y: this.y,
     width: DistanceMeter.dimensions.WIDTH * (this.highScore.length + 1) +
         DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
     height: DistanceMeter.dimensions.HEIGHT +
         (DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING * 2)
   };
 },
 /**
  * Animate flashing the high score to indicate ready for resetting.
  * The flashing stops following this.config.FLASH_ITERATIONS x 2 flashes.
  */
 flashHighScore: function() {
   var now = getTimeStamp();
   var deltaTime = now - (this.frameTimeStamp || now);
   var paint = true;
   this.frameTimeStamp = now;
   // Reached the max number of flashes.
   if (this.flashIterations > this.config.FLASH_ITERATIONS * 2) {
     this.cancelHighScoreFlashing();
     return;
   }
   this.flashTimer += deltaTime;
   if (this.flashTimer < this.config.FLASH_DURATION) {
     paint = false;
   } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
     this.flashTimer = 0;
     this.flashIterations++;
   }
   if (paint) {
     this.drawHighScore();
   } else {
     this.clearHighScoreBounds();
   }
   // Frame update.
   this.flashingRafId =
       requestAnimationFrame(this.flashHighScore.bind(this));
 },
 /**
  * Draw empty rectangle over high score.
  */
 clearHighScoreBounds: function() {
   this.canvasCtx.save();
   this.canvasCtx.fillStyle = '#fff';
   this.canvasCtx.rect(this.highScoreBounds.x, this.highScoreBounds.y,
       this.highScoreBounds.width, this.highScoreBounds.height);
   this.canvasCtx.fill();
   this.canvasCtx.restore();
 },
 /**
  * Starts the flashing of the high score.
  */
 startHighScoreFlashing() {
   this.highScoreFlashing = true;
   this.flashHighScore();
 },
 /**
  * Whether high score is flashing.
  * @return {boolean}
  */
 isHighScoreFlashing() {
   return this.highScoreFlashing;
 },
 /**
  * Stop flashing the high score.
  */
 cancelHighScoreFlashing: function() {
   cancelAnimationFrame(this.flashingRafId);
   this.flashIterations = 0;
   this.flashTimer = 0;
   this.highScoreFlashing = false;
   this.clearHighScoreBounds();
   this.drawHighScore();
 },
 /**
  * Clear the high score.
  */
 resetHighScore: function() {
   this.setHighScore(0);
   this.cancelHighScoreFlashing();
 },
 /**
  * Reset the distance meter back to '00000'.
  */
 reset: function() {
   this.update(0);
   this.achievement = false;
 }

};


//******************************************************************************

/**

* Cloud background item.
* Similar to an obstacle object but without collision boxes.
* @param {HTMLCanvasElement} canvas Canvas element.
* @param {Object} spritePos Position of image in sprite.
* @param {number} containerWidth
*/

function Cloud(canvas, spritePos, containerWidth) {

 this.canvas = canvas;
 this.canvasCtx = this.canvas.getContext('2d');
 this.spritePos = spritePos;
 this.containerWidth = containerWidth;
 this.xPos = containerWidth;
 this.yPos = 0;
 this.remove = false;
 this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP,
     Cloud.config.MAX_CLOUD_GAP);
 this.init();

};


/**

* Cloud object config.
* @enum {number}
*/

Cloud.config = {

 HEIGHT: 14,
 MAX_CLOUD_GAP: 400,
 MAX_SKY_LEVEL: 30,
 MIN_CLOUD_GAP: 100,
 MIN_SKY_LEVEL: 71,
 WIDTH: 46

};


Cloud.prototype = {

 /**
  * Initialise the cloud. Sets the Cloud height.
  */
 init: function() {
   this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
       Cloud.config.MIN_SKY_LEVEL);
   this.draw();
 },
 /**
  * Draw the cloud.
  */
 draw: function() {
   this.canvasCtx.save();
   var sourceWidth = Cloud.config.WIDTH;
   var sourceHeight = Cloud.config.HEIGHT;
   var outputWidth = sourceWidth;
   var outputHeight = sourceHeight;
   if (IS_HIDPI) {
     sourceWidth = sourceWidth * 2;
     sourceHeight = sourceHeight * 2;
   }
   this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x,
       this.spritePos.y,
       sourceWidth, sourceHeight,
       this.xPos, this.yPos,
       outputWidth, outputHeight);
   this.canvasCtx.restore();
 },
 /**
  * Update the cloud position.
  * @param {number} speed
  */
 update: function(speed) {
   if (!this.remove) {
     this.xPos -= Math.ceil(speed);
     this.draw();
     // Mark as removeable if no longer in the canvas.
     if (!this.isVisible()) {
       this.remove = true;
     }
   }
 },
 /**
  * Check if the cloud is visible on the stage.
  * @return {boolean}
  */
 isVisible: function() {
   return this.xPos + Cloud.config.WIDTH > 0;
 }

};


//******************************************************************************

/**

* Nightmode shows a moon and stars on the horizon.
*/

function NightMode(canvas, spritePos, containerWidth) {

 this.spritePos = spritePos;
 this.canvas = canvas;
 this.canvasCtx = canvas.getContext('2d');
 this.xPos = containerWidth - 50;
 this.yPos = 30;
 this.currentPhase = 0;
 this.opacity = 0;
 this.containerWidth = containerWidth;
 this.stars = [];
 this.drawStars = false;
 this.placeStars();

};

/**

* @enum {number}
*/

NightMode.config = {

 FADE_SPEED: 0.035,
 HEIGHT: 40,
 MOON_SPEED: 0.25,
 NUM_STARS: 2,
 STAR_SIZE: 9,
 STAR_SPEED: 0.3,
 STAR_MAX_Y: 70,
 WIDTH: 20

};

NightMode.phases = [140, 120, 100, 60, 40, 20, 0];

NightMode.prototype = {

 /**
  * Update moving moon, changing phases.
  * @param {boolean} activated Whether night mode is activated.
  * @param {number} delta
  */
 update: function(activated, delta) {
   // Moon phase.
   if (activated && this.opacity == 0) {
     this.currentPhase++;
     if (this.currentPhase >= NightMode.phases.length) {
       this.currentPhase = 0;
     }
   }
   // Fade in / out.
   if (activated && (this.opacity < 1 || this.opacity == 0)) {
     this.opacity += NightMode.config.FADE_SPEED;
   } else if (this.opacity > 0) {
     this.opacity -= NightMode.config.FADE_SPEED;
   }
   // Set moon positioning.
   if (this.opacity > 0) {
     this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);
     // Update stars.
     if (this.drawStars) {
        for (var i = 0; i < NightMode.config.NUM_STARS; i++) {
           this.stars[i].x = this.updateXPos(this.stars[i].x,
               NightMode.config.STAR_SPEED);
        }
     }
     this.draw();
   } else {
     this.opacity = 0;
     this.placeStars();
   }
   this.drawStars = true;
 },
 updateXPos: function(currentPos, speed) {
   if (currentPos < -NightMode.config.WIDTH) {
     currentPos = this.containerWidth;
   } else {
     currentPos -= speed;
   }
   return currentPos;
 },
 draw: function() {
   var moonSourceWidth = this.currentPhase == 3 ? NightMode.config.WIDTH * 2 :
        NightMode.config.WIDTH;
   var moonSourceHeight = NightMode.config.HEIGHT;
   var moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
   var moonOutputWidth = moonSourceWidth;
   var starSize = NightMode.config.STAR_SIZE;
   var starSourceX = Runner.spriteDefinition.LDPI.STAR.x;
   if (IS_HIDPI) {
     moonSourceWidth *= 2;
     moonSourceHeight *= 2;
     moonSourceX = this.spritePos.x +
         (NightMode.phases[this.currentPhase] * 2);
     starSize *= 2;
     starSourceX = Runner.spriteDefinition.HDPI.STAR.x;
   }
   this.canvasCtx.save();
   this.canvasCtx.globalAlpha = this.opacity;
   // Stars.
   if (this.drawStars) {
     for (var i = 0; i < NightMode.config.NUM_STARS; i++) {
       this.canvasCtx.drawImage(Runner.imageSprite,
           starSourceX, this.stars[i].sourceY, starSize, starSize,
           Math.round(this.stars[i].x), this.stars[i].y,
           NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);
     }
   }
   // Moon.
   this.canvasCtx.drawImage(Runner.imageSprite, moonSourceX,
       this.spritePos.y, moonSourceWidth, moonSourceHeight,
       Math.round(this.xPos), this.yPos,
       moonOutputWidth, NightMode.config.HEIGHT);
   this.canvasCtx.globalAlpha = 1;
   this.canvasCtx.restore();
 },
 // Do star placement.
 placeStars: function() {
   var segmentSize = Math.round(this.containerWidth /
       NightMode.config.NUM_STARS);
   for (var i = 0; i < NightMode.config.NUM_STARS; i++) {
     this.stars[i] = {};
     this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));
     this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);
     if (IS_HIDPI) {
       this.stars[i].sourceY = Runner.spriteDefinition.HDPI.STAR.y +
           NightMode.config.STAR_SIZE * 2 * i;
     } else {
       this.stars[i].sourceY = Runner.spriteDefinition.LDPI.STAR.y +
           NightMode.config.STAR_SIZE * i;
     }
   }
 },
 reset: function() {
   this.currentPhase = 0;
   this.opacity = 0;
   this.update(false);
 }

};


//******************************************************************************

/**

* Horizon Line.
* Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
* @param {HTMLCanvasElement} canvas
* @param {Object} spritePos Horizon position in sprite.
* @constructor
 */

function HorizonLine(canvas, spritePos) {

 this.spritePos = spritePos;
 this.canvas = canvas;
 this.canvasCtx = canvas.getContext('2d');
 this.sourceDimensions = {};
 this.dimensions = HorizonLine.dimensions;
 this.sourceXPos = [this.spritePos.x, this.spritePos.x +
     this.dimensions.WIDTH];
 this.xPos = [];
 this.yPos = 0;
 this.bumpThreshold = 0.5;
 this.setSourceDimensions();
 this.draw();

};


/**

* Horizon line dimensions.
* @enum {number}
*/

HorizonLine.dimensions = {

 WIDTH: 600,
 HEIGHT: 12,
 YPOS: 127

};


HorizonLine.prototype = {

 /**
  * Set the source dimensions of the horizon line.
  */
 setSourceDimensions: function() {
   for (var dimension in HorizonLine.dimensions) {
     if (IS_HIDPI) {
       if (dimension != 'YPOS') {
         this.sourceDimensions[dimension] =
             HorizonLine.dimensions[dimension] * 2;
       }
     } else {
       this.sourceDimensions[dimension] =
           HorizonLine.dimensions[dimension];
     }
     this.dimensions[dimension] = HorizonLine.dimensions[dimension];
   }
   this.xPos = [0, HorizonLine.dimensions.WIDTH];
   this.yPos = HorizonLine.dimensions.YPOS;
 },
 /**
  * Return the crop x position of a type.
  */
 getRandomType: function() {
   return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
 },
 /**
  * Draw the horizon line.
  */
 draw: function() {
   this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0],
       this.spritePos.y,
       this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
       this.xPos[0], this.yPos,
       this.dimensions.WIDTH, this.dimensions.HEIGHT);
   this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1],
       this.spritePos.y,
       this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
       this.xPos[1], this.yPos,
       this.dimensions.WIDTH, this.dimensions.HEIGHT);
 },
 /**
  * Update the x position of an indivdual piece of the line.
  * @param {number} pos Line position.
  * @param {number} increment
  */
 updateXPos: function(pos, increment) {
   var line1 = pos;
   var line2 = pos == 0 ? 1 : 0;
   this.xPos[line1] -= increment;
   this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
   if (this.xPos[line1] <= -this.dimensions.WIDTH) {
     this.xPos[line1] += this.dimensions.WIDTH * 2;
     this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
     this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;
   }
 },
 /**
  * Update the horizon line.
  * @param {number} deltaTime
  * @param {number} speed
  */
 update: function(deltaTime, speed) {
   var increment = Math.floor(speed * (FPS / 1000) * deltaTime);
   if (this.xPos[0] <= 0) {
     this.updateXPos(0, increment);
   } else {
     this.updateXPos(1, increment);
   }
   this.draw();
 },
 /**
  * Reset horizon to the starting position.
  */
 reset: function() {
   this.xPos[0] = 0;
   this.xPos[1] = HorizonLine.dimensions.WIDTH;
 }

};


//******************************************************************************

/**

* Horizon background class.
* @param {HTMLCanvasElement} canvas
* @param {Object} spritePos Sprite positioning.
* @param {Object} dimensions Canvas dimensions.
* @param {number} gapCoefficient
* @constructor
 */

function Horizon(canvas, spritePos, dimensions, gapCoefficient) {

 this.canvas = canvas;
 this.canvasCtx = this.canvas.getContext('2d');
 this.config = Horizon.config;
 this.dimensions = dimensions;
 this.gapCoefficient = gapCoefficient;
 this.obstacles = [];
 this.obstacleHistory = [];
 this.horizonOffsets = [0, 0];
 this.cloudFrequency = this.config.CLOUD_FREQUENCY;
 this.spritePos = spritePos;
 this.nightMode = null;
 // Cloud
 this.clouds = [];
 this.cloudSpeed = this.config.BG_CLOUD_SPEED;
 // Horizon
 this.horizonLine = null;
 this.init();

};


/**

* Horizon config.
* @enum {number}
*/

Horizon.config = {

 BG_CLOUD_SPEED: 0.2,
 BUMPY_THRESHOLD: .3,
 CLOUD_FREQUENCY: .5,
 HORIZON_HEIGHT: 16,
 MAX_CLOUDS: 6

};


Horizon.prototype = {

 /**
  * Initialise the horizon. Just add the line and a cloud. No obstacles.
  */
 init: function() {
   this.addCloud();
   this.horizonLine = new HorizonLine(this.canvas, this.spritePos.HORIZON);
   this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
       this.dimensions.WIDTH);
 },
 /**
  * @param {number} deltaTime
  * @param {number} currentSpeed
  * @param {boolean} updateObstacles Used as an override to prevent
  *     the obstacles from being updated / added. This happens in the
  *     ease in section.
  * @param {boolean} showNightMode Night mode activated.
  */
 update: function(deltaTime, currentSpeed, updateObstacles, showNightMode) {
   this.runningTime += deltaTime;
   this.horizonLine.update(deltaTime, currentSpeed);
   this.nightMode.update(showNightMode);
   this.updateClouds(deltaTime, currentSpeed);
   if (updateObstacles) {
     this.updateObstacles(deltaTime, currentSpeed);
   }
 },
 /**
  * Update the cloud positions.
  * @param {number} deltaTime
  * @param {number} currentSpeed
  */
 updateClouds: function(deltaTime, speed) {
   var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
   var numClouds = this.clouds.length;
   if (numClouds) {
     for (var i = numClouds - 1; i >= 0; i--) {
       this.clouds[i].update(cloudSpeed);
     }
     var lastCloud = this.clouds[numClouds - 1];
     // Check for adding a new cloud.
     if (numClouds < this.config.MAX_CLOUDS &&
         (this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&
         this.cloudFrequency > Math.random()) {
       this.addCloud();
     }
     // Remove expired clouds.
     this.clouds = this.clouds.filter(function(obj) {
       return !obj.remove;
     });
   } else {
     this.addCloud();
   }
 },
 /**
  * Update the obstacle positions.
  * @param {number} deltaTime
  * @param {number} currentSpeed
  */
 updateObstacles: function(deltaTime, currentSpeed) {
   // Obstacles, move to Horizon layer.
   var updatedObstacles = this.obstacles.slice(0);
   for (var i = 0; i < this.obstacles.length; i++) {
     var obstacle = this.obstacles[i];
     obstacle.update(deltaTime, currentSpeed);
     // Clean up existing obstacles.
     if (obstacle.remove) {
       updatedObstacles.shift();
     }
   }
   this.obstacles = updatedObstacles;
   if (this.obstacles.length > 0) {
     var lastObstacle = this.obstacles[this.obstacles.length - 1];
     if (lastObstacle && !lastObstacle.followingObstacleCreated &&
         lastObstacle.isVisible() &&
         (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
         this.dimensions.WIDTH) {
       this.addNewObstacle(currentSpeed);
       lastObstacle.followingObstacleCreated = true;
     }
   } else {
     // Create new obstacles.
     this.addNewObstacle(currentSpeed);
   }
 },
 removeFirstObstacle: function() {
   this.obstacles.shift();
 },
 /**
  * Add a new obstacle.
  * @param {number} currentSpeed
  */
 addNewObstacle: function(currentSpeed) {
   var obstacleTypeIndex = getRandomNum(0, Obstacle.types.length - 1);
   var obstacleType = Obstacle.types[obstacleTypeIndex];
   // Check for multiples of the same type of obstacle.
   // Also check obstacle is available at current speed.
   if (this.duplicateObstacleCheck(obstacleType.type) ||
       currentSpeed < obstacleType.minSpeed) {
     this.addNewObstacle(currentSpeed);
   } else {
     var obstacleSpritePos = this.spritePos[obstacleType.type];
     this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType,
         obstacleSpritePos, this.dimensions,
         this.gapCoefficient, currentSpeed, obstacleType.width));
     this.obstacleHistory.unshift(obstacleType.type);
     if (this.obstacleHistory.length > 1) {
       this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);
     }
   }
 },
 /**
  * Returns whether the previous two obstacles are the same as the next one.
  * Maximum duplication is set in config value MAX_OBSTACLE_DUPLICATION.
  * @return {boolean}
  */
 duplicateObstacleCheck: function(nextObstacleType) {
   var duplicateCount = 0;
   for (var i = 0; i < this.obstacleHistory.length; i++) {
     duplicateCount = this.obstacleHistory[i] == nextObstacleType ?
         duplicateCount + 1 : 0;
   }
   return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;
 },
 /**
  * Reset the horizon layer.
  * Remove existing obstacles and reposition the horizon line.
  */
 reset: function() {
   this.obstacles = [];
   this.horizonLine.reset();
   this.nightMode.reset();
 },
 /**
  * Update the canvas width and scaling.
  * @param {number} width Canvas width.
  * @param {number} height Canvas height.
  */
 resize: function(width, height) {
   this.canvas.width = width;
   this.canvas.height = height;
 },
 /**
  * Add a new cloud to the horizon.
  */
 addCloud: function() {
   this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
       this.dimensions.WIDTH));
 }

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   </template>


<script jstcache="0">// Copyright (c) 2012 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.

/**

* @fileoverview This file defines a singleton which provides access to all data
* that is available as soon as the page's resources are loaded (before DOM
* content has finished loading). This data includes both localized strings and
* any data that is important to have ready from a very early stage (e.g. things
* that must be displayed right away).
*
 * Note that loadTimeData is not guaranteed to be consistent between page
* refreshes (https://crbug.com/740629) and should not contain values that might
* change if the page is re-opened later.
*/

// #import {assert} from './assert.m.js'; // #import {parseHtmlSubset} from './parse_html_subset.m.js';

/**

* @typedef {{*   substitutions: (Array<string>|undefined),
 *   attrs: (Object<function(Node, string):boolean>|undefined),
 *   tags: (Array<string>|undefined),
 * }}
*/

/* #export */ let SanitizeInnerHtmlOpts;

// eslint-disable-next-line no-var /* #export */ /** @type {!LoadTimeData} */ var loadTimeData;

// Expose this type globally as a temporary work around until // https://github.com/google/closure-compiler/issues/544 is fixed. /** @constructor */ function LoadTimeData(){}

(function() {

 'use strict';
 LoadTimeData.prototype = {
   /**
    * Sets the backing object.
    *
    * Note that there is no getter for |data_| to discourage abuse of the form:
    *
    *     var value = loadTimeData.data()['key'];
    *
    * @param {Object} value The de-serialized page data.
    */
   set data(value) {
     expect(!this.data_, 'Re-setting data.');
     this.data_ = value;
   },
   /**
    * Returns a JsEvalContext for |data_|.
    * @returns {JsEvalContext}
    */
   createJsEvalContext: function() {
     return new JsEvalContext(this.data_);
   },
   /**
    * @param {string} id An ID of a value that might exist.
    * @return {boolean} True if |id| is a key in the dictionary.
    */
   valueExists: function(id) {
     return id in this.data_;
   },
   /**
    * Fetches a value, expecting that it exists.
    * @param {string} id The key that identifies the desired value.
    * @return {*} The corresponding value.
    */
   getValue: function(id) {
     expect(this.data_, 'No data. Did you remember to include strings.js?');
     const value = this.data_[id];
     expect(typeof value != 'undefined', 'Could not find value for ' + id);
     return value;
   },
   /**
    * As above, but also makes sure that the value is a string.
    * @param {string} id The key that identifies the desired string.
    * @return {string} The corresponding string value.
    */
   getString: function(id) {
     const value = this.getValue(id);
     expectIsType(id, value, 'string');
     return /** @type {string} */ (value);
   },
   /**
    * Returns a formatted localized string where $1 to $9 are replaced by the
    * second to the tenth argument.
    * @param {string} id The ID of the string we want.
    * @param {...(string|number)} var_args The extra values to include in the
    *     formatted output.
    * @return {string} The formatted string.
    */
   getStringF: function(id, var_args) {
     const value = this.getString(id);
     if (!value) {
       return ;
     }
     const args = Array.prototype.slice.call(arguments);
     args[0] = value;
     return this.substituteString.apply(this, args);
   },
   /**
    * Make a string safe for use with with Polymer bindings that are
    * inner-h-t-m-l (or other innerHTML use).
    * @param {string} rawString The unsanitized string.
    * @param {SanitizeInnerHtmlOpts=} opts Optional additional allowed tags and
    *     attributes.
    * @return {string}
    */
   sanitizeInnerHtml: function(rawString, opts) {
     opts = opts || {};
     return parseHtmlSubset('' + rawString + '', opts.tags, opts.attrs)
         .firstChild.innerHTML;
   },
   /**
    * Returns a formatted localized string where $1 to $9 are replaced by the
    * second to the tenth argument. Any standalone $ signs must be escaped as
    * $$.
    * @param {string} label The label to substitute through.
    *     This is not an resource ID.
    * @param {...(string|number)} var_args The extra values to include in the
    *     formatted output.
    * @return {string} The formatted string.
    */
   substituteString: function(label, var_args) {
     const varArgs = arguments;
     return label.replace(/\$(.|$|\n)/g, function(m) {
       assert(m.match(/\$[$1-9]/), 'Unescaped $ found in localized string.');
       return m == '$$' ? '$' : varArgs[m[1]];
     });
   },
   /**
    * Returns a formatted string where $1 to $9 are replaced by the second to
    * tenth argument, split apart into a list of pieces describing how the
    * substitution was performed. Any standalone $ signs must be escaped as $$.
    * @param {string} label A localized string to substitute through.
    *     This is not an resource ID.
    * @param {...(string|number)} var_args The extra values to include in the
    *     formatted output.
    * @return {!Array<!{value: string, arg: (null|string)}>} The formatted
    *     string pieces.
    */
   getSubstitutedStringPieces: function(label, var_args) {
     const varArgs = arguments;
     // Split the string by separately matching all occurrences of $1-9 and of
     // non $1-9 pieces.
     const pieces = (label.match(/(\$[1-9])|(([^$]|\$([^1-9]|$))+)/g) ||
                     []).map(function(p) {
       // Pieces that are not $1-9 should be returned after replacing $$
       // with $.
       if (!p.match(/^\$[1-9]$/)) {
         assert(
             (p.match(/\$/g) || []).length % 2 == 0,
             'Unescaped $ found in localized string.');
         return {value: p.replace(/\$\$/g, '$'), arg: null};
       }
       // Otherwise, return the substitution value.
       return {value: varArgs[p[1]], arg: p};
     });
     return pieces;
   },
   /**
    * As above, but also makes sure that the value is a boolean.
    * @param {string} id The key that identifies the desired boolean.
    * @return {boolean} The corresponding boolean value.
    */
   getBoolean: function(id) {
     const value = this.getValue(id);
     expectIsType(id, value, 'boolean');
     return /** @type {boolean} */ (value);
   },
   /**
    * As above, but also makes sure that the value is an integer.
    * @param {string} id The key that identifies the desired number.
    * @return {number} The corresponding number value.
    */
   getInteger: function(id) {
     const value = this.getValue(id);
     expectIsType(id, value, 'number');
     expect(value == Math.floor(value), 'Number isn\'t integer: ' + value);
     return /** @type {number} */ (value);
   },
   /**
    * Override values in loadTimeData with the values found in |replacements|.
    * @param {Object} replacements The dictionary object of keys to replace.
    */
   overrideValues: function(replacements) {
     expect(
         typeof replacements == 'object',
         'Replacements must be a dictionary object.');
     for (const key in replacements) {
       this.data_[key] = replacements[key];
     }
   }
 };
 /**
  * Checks condition, displays error message if expectation fails.
  * @param {*} condition The condition to check for truthiness.
  * @param {string} message The message to display if the check fails.
  */
 function expect(condition, message) {
   if (!condition) {
     console.error(
         'Unexpected condition on ' + document.location.href + ': ' + message);
   }
 }
 /**
  * Checks that the given value has the given type.
  * @param {string} id The id of the value (only used for error message).
  * @param {*} value The value to check the type on.
  * @param {string} type The type we expect |value| to be.
  */
 function expectIsType(id, value, type) {
   expect(
       typeof value == type, '[' + value + '] (' + id + ') is not a ' + type);
 }
 expect(!loadTimeData, 'should only include this file once');
 loadTimeData = new LoadTimeData;
 // Expose |loadTimeData| directly on |window|. This is only necessary by the
 // auto-generated load_time_data.m.js, since within a JS module the scope is
 // local.
 window.loadTimeData = loadTimeData;

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