diff --git "a/index.html" "b/index.html"
--- "a/index.html"
+++ "b/index.html"
@@ -1,19 +1,6600 @@
-<!DOCTYPE html>
-<html>
-	<head>
-		<meta charset="utf-8" />
-		<meta name="viewport" content="width=device-width" />
-		<title>My static Space</title>
-		<link rel="stylesheet" href="style.css" />
-	</head>
-	<body>
-		<div class="card">
-			<h1>Welcome to your static Space!</h1>
-			<p>You can modify this app directly by editing <i>index.html</i> in the Files and versions tab.</p>
-			<p>
-				Also don't forget to check the
-				<a href="https://huggingface.co/docs/hub/spaces" target="_blank">Spaces documentation</a>.
-			</p>
-		</div>
-	</body>
-</html>
+<html dir="ltr" lang="zh" class="offline">
+
+<head>
+    <meta charset="utf-8">
+    <meta name="color-scheme" content="light dark">
+    <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://dino/</title>
+    <style>
+        /* Copyright 2017 The Chromium Authors
+ * 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 {
+                --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
+   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,
+        .https-only button,
+        .insecure-form button,
+        .lookalike-url button,
+        .main-frame-blocked button,
+        .neterror button,
+        .pdf button,
+        .ssl button,
+        .enterprise-block button,
+        .enterprise-warn button,
+        .safe-browsing-billing button {
+            background: var(--primary-button-fill-color);
+        }
+
+        button:active {
+            background: var(--primary-button-fill-color-active);
+            outline: 0;
+        }
+
+        #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;
+        }
+
+        #details {
+            margin: 0 0 50px;
+        }
+
+        #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: .8em;
+            margin-top: 12px;
+            text-transform: uppercase;
+        }
+
+        #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%;
+        }
+
+        #main-message>p {
+            display: inline;
+        }
+
+        #extended-reporting-opt-in {
+            font-size: .875em;
+            margin-top: 32px;
+        }
+
+        #extended-reporting-opt-in label {
+            display: grid;
+            grid-template-columns: 1.8em 1fr;
+            position: relative;
+        }
+
+        #enhanced-protection-message {
+            border-radius: 4px;
+            font-size: 1em;
+            margin-top: 32px;
+            padding: 10px 5px;
+        }
+
+        #enhanced-protection-message label {
+            display: grid;
+            grid-template-columns: 2.5em 1fr;
+            position: relative;
+        }
+
+        #enhanced-protection-message div {
+            margin: 0.5em;
+        }
+
+        #enhanced-protection-message .icon {
+            height: 1.5em;
+            vertical-align: middle;
+            width: 1.5em;
+        }
+
+        .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;
+            left: var(--padding);
+            position: absolute;
+            top: var(--padding);
+            width: 1em;
+        }
+
+        .checkbox::before {
+            background: transparent;
+            border: 2px solid white;
+            border-inline-end-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;
+        }
+
+        #recurrent-error-message {
+            background: #ededed;
+            border-radius: 4px;
+            margin-bottom: 16px;
+            margin-top: 12px;
+            padding: 12px 16px;
+        }
+
+        .showing-recurrent-error-message #extended-reporting-opt-in {
+            margin-top: 16px;
+        }
+
+        .showing-recurrent-error-message #enhanced-protection-message {
+            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;
+            }
+
+            #enhanced-protection-message {
+                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-inline-end: 24px;
+                padding-inline-start: 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 {
+                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-inline-end: 0;
+                padding-inline-start: 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-inline-end: 0;
+                padding-inline-start: 0;
+            }
+        }
+    </style>
+    <style>
+        /* Copyright 2013 The Chromium Authors
+ * 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;
+        }
+
+        h1 {
+            margin-top: 0;
+            word-wrap: break-word;
+        }
+
+        h1 span {
+            font-weight: 500;
+        }
+
+        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;
+        }
+
+        .hidden {
+            display: none;
+        }
+
+        #suggestions-list a {
+            color: var(--google-blue-600);
+        }
+
+        #suggestions-list p {
+            margin-block-end: 0;
+        }
+
+        #suggestions-list ul {
+            margin-top: 0;
+        }
+
+        .single-suggestion {
+            list-style-type: none;
+            padding-inline-start: 0;
+        }
+
+        #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;
+        }
+
+        #error-information-popup-close {
+            margin-bottom: 0;
+            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;
+        }
+
+        #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;
+        }
+
+        .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 250ms cubic-bezier(0, 0, 0.2, 1) forwards,
+                hide-snackbar 250ms cubic-bezier(0.4, 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;
+        }
+
+        /* Decrease padding at low sizes. */
+        @media (max-width: 640px),
+        (max-height: 640px) {
+            h1 {
+                margin: 0 0 15px;
+            }
+
+            .suggestions {
+                margin-top: 10px;
+            }
+
+            .suggestion-header {
+                margin-bottom: 0;
+            }
+        }
+
+        #download-link,
+        #download-link-clicked {
+            margin-bottom: 30px;
+            margin-top: 30px;
+        }
+
+        #download-link-clicked {
+            color: #BBB;
+        }
+
+        #download-link::before,
+        #download-link-clicked::before {
+            content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+            display: inline-block;
+            margin-inline-end: 4px;
+            vertical-align: -webkit-baseline-middle;
+        }
+
+        #download-link-clicked::before {
+            opacity: 0;
+            width: 0;
+        }
+
+        #offline-content-list-visibility-card {
+            border: 1px solid white;
+            border-radius: 8px;
+            display: flex;
+            font-size: .8em;
+            justify-content: space-between;
+            line-height: 1;
+        }
+
+        #offline-content-list.list-hidden #offline-content-list-visibility-card {
+            border-color: rgb(218, 220, 224);
+        }
+
+        #offline-content-list-visibility-card>div {
+            padding: 1em;
+        }
+
+        #offline-content-list-title {
+            color: var(--google-gray-700);
+        }
+
+        #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.
+ */
+        #offline-content-list.list-hidden #offline-content-list-hide-text,
+        #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.
+ */
+        #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 200ms ease-in, visibility 0s 200ms,
+                opacity 200ms 200ms linear;
+        }
+
+        /* Controls the animation of the offline content list when it is
+ * collapsed/hidden.
+ */
+        #offline-content-list.list-hidden #offline-content-suggestions {
+            max-height: 0;
+            opacity: 0;
+            transition: opacity 200ms linear, visibility 0s 200ms,
+                max-height 200ms 200ms ease-out;
+            visibility: hidden;
+        }
+
+        #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,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTcgMTAuNVY3YTEgMSAwIDAgMC0xLTFINGExIDEgMCAwIDAtMSAxdjEwYTEgMSAwIDAgMCAxIDFoMTJhMSAxIDAgMCAwIDEtMXYtMy41bDQgNHYtMTFsLTQgNHoiIGZpbGw9IiMzQzQwNDMiLz48L3N2Zz4=);
+        }
+
+        .image-music-note {
+            content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTIgM3Y5LjI2Yy0uNS0uMTctMS0uMjYtMS41LS4yNkM4IDEyIDYgMTQgNiAxNi41UzggMjEgMTAuNSAyMXM0LjUtMiA0LjUtNC41VjZoNFYzaC03eiIgZmlsbD0iIzNDNDA0MyIvPjwvc3ZnPg==);
+        }
+
+        .image-earth {
+            content: url(data:image/svg+xml;base64,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);
+        }
+
+        .image-file {
+            content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTMgOVYzLjVMMTguNSA5TTYgMmMtMS4xMSAwLTIgLjg5LTIgMnYxNmEyIDIgMCAwIDAgMiAyaDEyYTIgMiAwIDAgMCAyLTJWOGwtNi02SDZ6IiBmaWxsPSIjM0M0MDQzIi8+PC9zdmc+);
+        }
+
+        .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: 0;
+        }
+
+        .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: hidden;
+            overflow-wrap: break-word;
+            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-grow: 100;
+            flex-shrink: 1;
+        }
+
+        .suggestion-with-image .offline-content-suggestion-pin {
+            content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB2aWV3Qm94PSIwIDAgMjQgMjQiIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCI+PGRlZnM+PHBhdGggaWQ9ImEiIGQ9Ik0wIDBoMjR2MjRIMFYweiIvPjwvZGVmcz48Y2xpcFBhdGggaWQ9ImIiPjx1c2UgeGxpbms6aHJlZj0iI2EiIG92ZXJmbG93PSJ2aXNpYmxlIi8+PC9jbGlwUGF0aD48cGF0aCBjbGlwLXBhdGg9InVybCgjYikiIGQ9Ik0xMiAyQzYuNSAyIDIgNi41IDIgMTJzNC41IDEwIDEwIDEwIDEwLTQuNSAxMC0xMFMxNy41IDIgMTIgMnptNSAxNkg3di0yaDEwdjJ6bS02LjctNEw3IDEwLjdsMS40LTEuNCAxLjkgMS45IDUuMy01LjNMMTcgNy4zIDEwLjMgMTR6IiBmaWxsPSIjOUFBMEE2Ii8+PC9zdmc+);
+            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.
+ */
+        #offline-content-list-action {
+            text-align: center;
+            transition: visibility 0s 200ms, opacity 200ms 200ms linear;
+        }
+
+        /* Controls the animation of the launch-downloads-home action button when the
+ * offline content list is collapsed/hidden.
+ */
+        #offline-content-list.list-hidden #offline-content-list-action {
+            opacity: 0;
+            transition: opacity 200ms linear, visibility 0s 200ms;
+            visibility: hidden;
+        }
+
+        #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;
+        }
+
+        #save-page-for-later-button {
+            display: flex;
+            justify-content: start;
+        }
+
+        #save-page-for-later-button a::before {
+            content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+            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;
+        }
+
+        #sub-frame-error {
+            -webkit-align-items: center;
+            -webkit-flex-flow: column;
+            -webkit-justify-content: center;
+            background-color: #DDD;
+            display: -webkit-flex;
+            height: 100%;
+            left: 0;
+            position: absolute;
+            text-align: center;
+            top: 0;
+            transition: background-color 200ms ease-in-out;
+            width: 100%;
+        }
+
+        #sub-frame-error:hover {
+            background-color: #EEE;
+        }
+
+        #sub-frame-error .icon-generic {
+            margin: 0 0 16px;
+        }
+
+        #sub-frame-error-details {
+            margin: 0 10px;
+            text-align: center;
+            visibility: hidden;
+        }
+
+        /* Show details only when hovering. */
+        #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. */
+        #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: 0;
+            margin-inline-start: 16px;
+        }
+
+        #details-button.singular {
+            float: none;
+        }
+
+        /* download-button shows both icon and text. */
+        #download-button {
+            padding-bottom: 4px;
+            padding-top: 4px;
+            position: relative;
+        }
+
+        #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;
+            height: 24px;
+            margin-inline-end: 4px;
+            margin-inline-start: -4px;
+            vertical-align: middle;
+            width: 24px;
+        }
+
+        #download-button:disabled {
+            background: rgb(180, 206, 249);
+            color: rgb(255, 255, 255);
+        }
+
+        #buttons::after {
+            clear: both;
+            content: '';
+            display: block;
+            width: 100%;
+        }
+
+        /* Offline page */
+        html[dir='rtl'] .runner-container,
+        html[dir='rtl'].offline .icon-offline {
+            transform: scaleX(-1);
+        }
+
+        .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;
+        }
+
+        .offline.inverted {
+            background-color: #fff;
+            filter: invert(1);
+        }
+
+        .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;
+            position: relative;
+            width: 100%;
+        }
+
+        .offline .runner-container {
+            direction: ltr;
+            height: 150px;
+            max-width: 600px;
+            overflow: hidden;
+            position: absolute;
+            top: 35px;
+            width: 44px;
+        }
+
+        .offline .runner-container:focus {
+            outline: none;
+        }
+
+        .offline .runner-container:focus-visible {
+            outline: 3px solid var(--google-blue-300);
+        }
+
+        .offline .runner-canvas {
+            height: 150px;
+            max-width: 600px;
+            opacity: 1;
+            overflow: hidden;
+            position: absolute;
+            top: 0;
+            z-index: 10;
+        }
+
+        .offline .controller {
+            height: 100vh;
+            left: 0;
+            position: absolute;
+            top: 0;
+            width: 100vw;
+            z-index: 9;
+        }
+
+        #offline-resources {
+            display: none;
+        }
+
+        #offline-instruction {
+            image-rendering: pixelated;
+            left: 0;
+            margin: auto;
+            position: absolute;
+            right: 0;
+            top: 60px;
+            width: fit-content;
+        }
+
+        .offline-runner-live-region {
+            bottom: 0;
+            clip-path: polygon(0 0, 0 0, 0 0);
+            color: var(--background-color);
+            display: block;
+            font-size: xx-small;
+            overflow: hidden;
+            position: absolute;
+            text-align: center;
+            transition: color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+            user-select: none;
+        }
+
+        /* Custom toggle */
+        .slow-speed-option {
+            align-items: center;
+            background: var(--google-gray-50);
+            border-radius: 24px/50%;
+            bottom: 0;
+            color: var(--error-code-color);
+            display: inline-flex;
+            font-size: 1em;
+            left: 0;
+            line-height: 1.1em;
+            margin: 5px auto;
+            padding: 2px 12px 3px 20px;
+            position: absolute;
+            right: 0;
+            width: max-content;
+            z-index: 999;
+        }
+
+        .slow-speed-option.hidden {
+            display: none;
+        }
+
+        .slow-speed-option [type=checkbox] {
+            opacity: 0;
+            pointer-events: none;
+            position: absolute;
+        }
+
+        .slow-speed-option .slow-speed-toggle {
+            cursor: pointer;
+            margin-inline-start: 8px;
+            padding: 8px 4px;
+            position: relative;
+        }
+
+        .slow-speed-option [type=checkbox]:disabled~.slow-speed-toggle {
+            cursor: default;
+        }
+
+        .slow-speed-option-label [type=checkbox] {
+            opacity: 0;
+            pointer-events: none;
+            position: absolute;
+        }
+
+        .slow-speed-option .slow-speed-toggle::before,
+        .slow-speed-option .slow-speed-toggle::after {
+            content: '';
+            display: block;
+            margin: 0 3px;
+            transition: all 100ms cubic-bezier(0.4, 0, 1, 1);
+        }
+
+        .slow-speed-option .slow-speed-toggle::before {
+            background: rgb(189, 193, 198);
+            border-radius: 0.65em;
+            height: 0.9em;
+            width: 2em;
+        }
+
+        .slow-speed-option .slow-speed-toggle::after {
+            background: #fff;
+            border-radius: 50%;
+            box-shadow: 0 1px 3px 0 rgb(0 0 0 / 40%);
+            height: 1.2em;
+            position: absolute;
+            top: 51%;
+            transform: translate(-20%, -50%);
+            width: 1.1em;
+        }
+
+        .slow-speed-option [type=checkbox]:focus+.slow-speed-toggle {
+            box-shadow: 0 0 8px rgb(94, 158, 214);
+            outline: 1px solid rgb(93, 157, 213);
+        }
+
+        .slow-speed-option [type=checkbox]:checked+.slow-speed-toggle::before {
+            background: var(--google-blue-600);
+            opacity: 0.5;
+        }
+
+        .slow-speed-option [type=checkbox]:checked+.slow-speed-toggle::after {
+            background: var(--google-blue-600);
+            transform: translate(calc(2em - 90%), -50%);
+        }
+
+        .slow-speed-option [type=checkbox]:checked:disabled+.slow-speed-toggle::before {
+            background: rgb(189, 193, 198);
+        }
+
+        .slow-speed-option [type=checkbox]:checked:disabled+.slow-speed-toggle::after {
+            background: var(--google-gray-50);
+        }
+
+        @media (max-width: 420px) {
+            #download-button {
+                padding-bottom: 12px;
+                padding-top: 12px;
+            }
+
+            .suggested-left>#control-buttons,
+            .suggested-right>#control-buttons {
+                float: none;
+            }
+
+            .snackbar {
+                border-radius: 0;
+                bottom: 0;
+                left: 0;
+                width: 100%;
+            }
+        }
+
+        @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-inline-end: 12px;
+                padding-inline-start: 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, 1, 1) 400ms;
+            z-index: 2;
+        }
+
+        @media (prefers-color-scheme: dark) {
+            .icon {
+                filter: invert(1);
+            }
+
+            .offline .runner-canvas {
+                filter: invert(1);
+            }
+
+            .offline.inverted {
+                background-color: var(--background-color);
+                filter: invert(0);
+            }
+
+            .offline.inverted body {
+                background-color: #fff;
+            }
+
+            .offline.inverted .offline-runner-live-region {
+                color: #fff;
+            }
+
+            #suggestions-list a {
+                color: var(--link-color);
+            }
+
+            #error-information-button {
+                filter: invert(0.6);
+            }
+
+            .slow-speed-option {
+                background: var(--google-gray-800);
+                color: var(--google-gray-100);
+            }
+
+            .slow-speed-option .slow-speed-toggle::before,
+            .slow-speed-option [type=checkbox]:checked:disabled+.slow-speed-toggle::before {
+                background: rgb(189, 193, 198);
+            }
+
+            .slow-speed-option [type=checkbox]:checked+.slow-speed-toggle::after,
+            .slow-speed-option [type=checkbox]:checked+.slow-speed-toggle::before {
+                background: var(--google-blue-300);
+            }
+        }
+    </style>
+    <script>// Copyright 2013 The Chromium Authors
+        // Use of this source code is governed by a BSD-style license that can be
+        // found in the LICENSE file.
+
+        /**
+         * @typedef {{
+         *   downloadButtonClick: function(),
+         *   reloadButtonClick: function(string),
+         *   detailsButtonClick: function(),
+         *   diagnoseErrorsButtonClick: function(),
+         *   portalSigninsButtonClick: function(),
+         *   trackEasterEgg: function(),
+         *   updateEasterEggHighScore: function(number),
+         *   resetEasterEggHighScore: function(),
+         *   launchOfflineItem: function(string, string),
+         *   savePageForLater: function(),
+         *   cancelSavePage: function(),
+         *   listVisibilityChange: function(boolean),
+         * }}
+         */
+        // eslint-disable-next-line no-var
+        var errorPageController;
+
+        const HIDDEN_CLASS = 'hidden';
+
+        // Decodes a UTF16 string that is encoded as base64.
+        function decodeUTF16Base64ToString(encoded_text) {
+            const data = atob(encoded_text);
+            let result = '';
+            for (let i = 0; i < data.length; i += 2) {
+                result +=
+                    String.fromCharCode(data.charCodeAt(i) * 256 + data.charCodeAt(i + 1));
+            }
+            return result;
+        }
+
+        function toggleHelpBox() {
+            const helpBoxOuter = document.getElementById('details');
+            helpBoxOuter.classList.toggle(HIDDEN_CLASS);
+            const detailsButton = document.getElementById('details-button');
+            if (helpBoxOuter.classList.contains(HIDDEN_CLASS)) {
+                /** @suppress {missingProperties} */
+                detailsButton.innerText = detailsButton.detailsText;
+            } else {
+                /** @suppress {missingProperties} */
+                detailsButton.innerText = detailsButton.hideDetailsText;
+            }
+
+            // Details appears over the main content on small screens.
+            if (mobileNav) {
+                document.getElementById('main-content').classList.toggle(HIDDEN_CLASS);
+                const runnerContainer = document.querySelector('.runner-container');
+                if (runnerContainer) {
+                    runnerContainer.classList.toggle(HIDDEN_CLASS);
+                }
+            }
+        }
+
+        function diagnoseErrors() {
+            if (window.errorPageController) {
+                errorPageController.diagnoseErrorsButtonClick();
+            }
+        }
+
+        function portalSignin() {
+            if (window.errorPageController) {
+                errorPageController.portalSigninButtonClick();
+            }
+        }
+
+        // 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). We also use the subframe style for portals
+        // as they are embedded like subframes and can't be interacted with by the user.
+        let isSubFrame = false;
+        if (window.top.location !== window.location || window.portalHost) {
+            document.documentElement.setAttribute('subframe', '');
+            isSubFrame = true;
+        }
+
+        // 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) {
+            const context = new JsEvalContext(strings);
+            jstProcess(context, document.getElementById('t'));
+            onDocumentLoadOrUpdate();
+        }
+
+        // Adds an icon class to the list and removes classes previously set.
+        function updateIconClass(newClass) {
+            const frameSelector = isSubFrame ? '#sub-frame-error' : '#main-frame-error';
+            const iconEl = document.querySelector(frameSelector + ' .icon');
+
+            if (iconEl.classList.contains(newClass)) {
+                return;
+            }
+
+            iconEl.className = 'icon ' + newClass;
+        }
+
+        // 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 {
+                window.location = url;
+            }
+        }
+
+        function downloadButtonClick() {
+            if (window.errorPageController) {
+                errorPageController.downloadButtonClick();
+                const downloadButton = document.getElementById('download-button');
+                downloadButton.disabled = true;
+                /** @suppress {missingProperties} */
+                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();
+            }
+        }
+
+        let primaryControlOnLeft = true;
+        // clang-format off
+        // 
+
+        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.
+            let thumbnail = '';
+            const 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.
+            const source = 'src';
+            if (item.thumbnail_data_uri) {
+                extraContainerClasses.push('suggestion-with-image');
+                thumbnail = `<img ${source}="${item.thumbnail_data_uri}">`;
+            } else {
+                extraContainerClasses.push('suggestion-with-icon');
+                const iconClass = getIconForSuggestedItem(item);
+                thumbnail = `<div><img class="${iconClass}"></div>`;
+            }
+
+            let favicon = '';
+            if (item.favicon_data_uri) {
+                favicon = `<img ${source}="${item.favicon_data_uri}">`;
+            } else {
+                extraContainerClasses.push('no-favicon');
+            }
+
+            if (!item.attribution_base64) {
+                extraContainerClasses.push('no-attribution');
+            }
+
+            return `
+  <div class="offline-content-suggestion ${extraContainerClasses.join(' ')}"
+    onclick="launchOfflineItem('${item.ID}', '${item.name_space}')">
+      <div class="offline-content-suggestion-texts">
+        <div id="offline-content-suggestion-title-${index}"
+             class="offline-content-suggestion-title">
+        </div>
+        <div class="offline-content-suggestion-attribution-freshness">
+          <div id="offline-content-suggestion-favicon-${index}"
+               class="offline-content-suggestion-favicon">
+            ${favicon}
+          </div>
+          <div id="offline-content-suggestion-attribution-${index}"
+               class="offline-content-suggestion-attribution">
+          </div>
+          <div class="offline-content-suggestion-freshness">
+            ${item.date_modified}
+          </div>
+          <div class="offline-content-suggestion-pin-spacer"></div>
+          <div class="offline-content-suggestion-pin"></div>
+        </div>
+      </div>
+      <div class="offline-content-suggestion-thumbnail">
+        ${thumbnail}
+      </div>
+  </div>`;
+        }
+
+        /**
+         * @typedef {{
+         *   ID: string,
+         *   name_space: string,
+         *   title_base64: string,
+         *   snippet_base64: string,
+         *   date_modified: string,
+         *   attribution_base64: string,
+         *   thumbnail_data_uri: string,
+         *   favicon_data_uri: string,
+         *   content_type: number,
+         * }}
+         */
+        let AvailableOfflineContent;
+
+        // Populates a list of suggested offline content.
+        // Note: For security reasons all content downloaded from the web is considered
+        // unsafe and must be securely handled to be presented on the dino page. Images
+        // have already been safely re-encoded but textual content -- like title and
+        // attribution -- must be properly handled here.
+        // @param {boolean} isShown
+        // @param {Array<AvailableOfflineContent>} suggestions
+        function offlineContentAvailable(isShown, suggestions) {
+            if (!suggestions || !loadTimeData.valueExists('offlineContentList')) {
+                return;
+            }
+
+            const suggestionsHTML = [];
+            for (let index = 0; index < suggestions.length; index++) {
+                suggestionsHTML.push(getSuggestedContentDiv(suggestions[index], index));
+            }
+
+            document.getElementById('offline-content-suggestions').innerHTML =
+                suggestionsHTML.join('\n');
+
+            // Sets textual web content using |textContent| to make sure it's handled as
+            // plain text.
+            for (let index = 0; index < suggestions.length; index++) {
+                document.getElementById(`offline-content-suggestion-title-${index}`)
+                    .textContent =
+                    decodeUTF16Base64ToString(suggestions[index].title_base64);
+                document.getElementById(`offline-content-suggestion-attribution-${index}`)
+                    .textContent =
+                    decodeUTF16Base64ToString(suggestions[index].attribution_base64);
+            }
+
+            const 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;
+            }
+
+            const contentListElement = document.getElementById('offline-content-list');
+            const isVisible = !contentListElement.classList.toggle('list-hidden');
+
+            if (updatePref && window.errorPageController) {
+                errorPageController.listVisibilityChanged(isVisible);
+            }
+        }
+
+        // Called on document load, and from updateForDnsProbe().
+        function onDocumentLoadOrUpdate() {
+            const downloadButtonVisible = loadTimeData.valueExists('downloadButton') &&
+                loadTimeData.getValue('downloadButton').msg;
+            const detailsButton = document.getElementById('details-button');
+
+            // If offline content suggestions will be visible, the usual buttons will not
+            // be presented.
+            const 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);
+            }
+
+            const attemptAutoFetch = loadTimeData.valueExists('attemptAutoFetch') &&
+                loadTimeData.getValue('attemptAutoFetch');
+
+            const reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
+                loadTimeData.getValue('reloadButton').msg;
+
+            const reloadButton = document.getElementById('reload-button');
+            const downloadButton = document.getElementById('download-button');
+            if (reloadButton.style.display === 'none' &&
+                downloadButton.style.display === 'none') {
+                detailsButton.classList.add('singular');
+            }
+
+            // Show or hide control buttons.
+            const controlButtonDiv = document.getElementById('control-buttons');
+            controlButtonDiv.hidden =
+                offlineContentVisible || !(reloadButtonVisible || downloadButtonVisible);
+
+            const iconClass = loadTimeData.valueExists('iconClass') &&
+                loadTimeData.getValue('iconClass');
+
+            updateIconClass(iconClass);
+
+            if (!isSubFrame && iconClass === 'icon-offline') {
+                document.documentElement.classList.add('offline');
+                new Runner('.interstitial-wrapper');
+            }
+        }
+
+        function onDocumentLoad() {
+            // Sets up the proper button layout for the current platform.
+            const buttonsDiv = document.getElementById('buttons');
+            if (primaryControlOnLeft) {
+                buttonsDiv.classList.add('suggested-left');
+            } else {
+                buttonsDiv.classList.add('suggested-right');
+            }
+
+            onDocumentLoadOrUpdate();
+        }
+
+        document.addEventListener('DOMContentLoaded', onDocumentLoad);
+    </script>
+    <script>// Copyright 2015 The Chromium Authors
+        // Use of this source code is governed by a BSD-style license that can be
+        // found in the LICENSE file.
+
+        let mobileNav = false;
+
+        /**
+         * For small screen mobile the navigation buttons are moved
+         * below the advanced text.
+         */
+        function onResize() {
+            const helpOuterBox = document.querySelector('#details');
+            const mainContent = document.querySelector('#main-content');
+            const mediaQuery = '(min-width: 240px) and (max-width: 420px) and ' +
+                '(min-height: 401px), ' +
+                '(max-height: 560px) and (min-height: 240px) and ' +
+                '(min-width: 421px)';
+
+            const detailsHidden = helpOuterBox.classList.contains(HIDDEN_CLASS);
+            const 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 2014 The Chromium Authors
+        // Use of this source code is governed by a BSD-style license that can be
+        // found in the LICENSE file.
+
+        /**
+         * T-Rex runner.
+         * @param {string} outerContainerId Outer containing element id.
+         * @param {!Object=} opt_config
+         * @constructor
+         * @implements {EventListener}
+         * @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 || Object.assign(Runner.config, Runner.normalConfig);
+            // Logical dimensions of the container.
+            this.dimensions = Runner.defaultDimensions;
+
+            this.gameType = null;
+            Runner.spriteDefinition = Runner.spriteDefinitionByType['original'];
+
+            this.altGameImageSprite = null;
+            this.altGameModeActive = false;
+            this.altGameModeFlashTimer = null;
+            this.fadeInTimer = 0;
+
+            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;
+            Runner.slowDown = false;
+
+            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;
+
+            /** @type {Object} */
+            this.soundFx = {};
+            this.generatedSoundFx = null;
+
+            // Global web audio context for playing sounds.
+            this.audioContext = null;
+
+            // Images.
+            this.images = {};
+            this.imagesLoaded = 0;
+
+            // Gamepad state.
+            this.pollingGamepads = false;
+            this.gamepadIndex = undefined;
+            this.previousGamepad = null;
+
+            if (this.isDisabled()) {
+                this.setupDisabledRunner();
+            } else {
+                if (Runner.isAltGameModeEnabled()) {
+                    this.initAltGameType();
+                    Runner.gameType = this.gameType;
+                }
+                this.loadImages();
+
+                window['initializeEasterEggHighScore'] =
+                    this.initializeHighScore.bind(this);
+            }
+        }
+
+        /**
+         * Default game width.
+         * @const
+         */
+        const DEFAULT_WIDTH = 600;
+
+        /**
+         * Frames per second.
+         * @const
+         */
+        const FPS = 60;
+
+        /** @const */
+        const IS_HIDPI = window.devicePixelRatio > 1;
+
+        /** @const */
+        const IS_IOS = /CriOS/.test(window.navigator.userAgent);
+
+        /** @const */
+        const IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;
+
+        /** @const */
+        const IS_RTL = document.querySelector('html').dir == 'rtl';
+
+        /** @const */
+        const ARCADE_MODE_URL = 'chrome://dino/';
+
+        /** @const */
+        const RESOURCE_POSTFIX = 'offline-resources-';
+
+        /** @const */
+        const A11Y_STRINGS = {
+            ariaLabel: 'dinoGameA11yAriaLabel',
+            description: 'dinoGameA11yDescription',
+            gameOver: 'dinoGameA11yGameOver',
+            highScore: 'dinoGameA11yHighScore',
+            jump: 'dinoGameA11yJump',
+            started: 'dinoGameA11yStartGame',
+            speedLabel: 'dinoGameA11ySpeedToggle',
+        };
+
+        /**
+         * Default game configuration.
+         * Shared config for all  versions of the game. Additional parameters are
+         * defined in Runner.normalConfig and Runner.slowConfig.
+         */
+        Runner.config = {
+            AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+            AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+            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,
+            FADE_DURATION: 1,
+            FLASH_DURATION: 1000,
+            GAMEOVER_CLEAR_TIME: 1200,
+            INITIAL_JUMP_VELOCITY: 12,
+            INVERT_FADE_DURATION: 12000,
+            MAX_BLINK_COUNT: 3,
+            MAX_CLOUDS: 6,
+            MAX_OBSTACLE_LENGTH: 3,
+            MAX_OBSTACLE_DUPLICATION: 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,
+        };
+
+        Runner.normalConfig = {
+            ACCELERATION: 0.001,
+            AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+            AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+            GAP_COEFFICIENT: 0.6,
+            INVERT_DISTANCE: 700,
+            MAX_SPEED: 13,
+            MOBILE_SPEED_COEFFICIENT: 1.2,
+            SPEED: 6,
+        };
+
+
+        Runner.slowConfig = {
+            ACCELERATION: 0.0005,
+            AUDIOCUE_PROXIMITY_THRESHOLD: 170,
+            AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 220,
+            GAP_COEFFICIENT: 0.3,
+            INVERT_DISTANCE: 350,
+            MAX_SPEED: 9,
+            MOBILE_SPEED_COEFFICIENT: 1.5,
+            SPEED: 4.2,
+        };
+
+
+        /**
+         * Default dimensions.
+         */
+        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',
+        };
+
+
+        /**
+         * 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',
+            GAMEPADCONNECTED: 'gamepadconnected',
+        };
+
+        Runner.prototype = {
+            /**
+             * Initialize alternative game type.
+             */
+            initAltGameType() {
+                if (GAME_TYPE.length > 0) {
+                    this.gameType = loadTimeData && loadTimeData.valueExists('altGameType') ?
+                        GAME_TYPE[parseInt(loadTimeData.getValue('altGameType'), 10) - 1] :
+                        '';
+                }
+            },
+
+            /**
+             * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.
+             * @return {boolean}
+             */
+            isDisabled() {
+                return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');
+            },
+
+            /**
+             * For disabled instances, set up a snackbar with the disabled message.
+             */
+            setupDisabledRunner() {
+                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 {number|string} value
+             */
+            updateConfigSetting(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(/** @type {number} */(value));
+                            break;
+                    }
+                }
+            },
+
+            /**
+             * Creates an on page image element from the base 64 encoded string source.
+             * @param {string} resourceName Name in data object,
+             * @return {HTMLImageElement} The created element.
+             */
+            createImageElement(resourceName) {
+                const imgSrc = loadTimeData && loadTimeData.valueExists(resourceName) ?
+                    loadTimeData.getString(resourceName) :
+                    null;
+
+                if (imgSrc) {
+                    const el =
+          /** @type {HTMLImageElement} */ (document.createElement('img'));
+                    el.id = resourceName;
+                    el.src = imgSrc;
+                    document.getElementById('offline-resources').appendChild(el);
+                    return el;
+                }
+                return null;
+            },
+
+            /**
+             * Cache the appropriate image sprite from the page and get the sprite sheet
+             * definition.
+             */
+            loadImages() {
+                let scale = '1x';
+                this.spriteDef = Runner.spriteDefinition.LDPI;
+                if (IS_HIDPI) {
+                    scale = '2x';
+                    this.spriteDef = Runner.spriteDefinition.HDPI;
+                }
+
+                Runner.imageSprite = /** @type {HTMLImageElement} */
+                    (document.getElementById(RESOURCE_POSTFIX + scale));
+
+                if (this.gameType) {
+                    Runner.altGameImageSprite = /** @type {HTMLImageElement} */
+                        (this.createImageElement('altGameSpecificImage' + scale));
+                    Runner.altCommonImageSprite = /** @type {HTMLImageElement} */
+                        (this.createImageElement('altGameCommonImage' + scale));
+                }
+                Runner.origImageSprite = Runner.imageSprite;
+
+                // Disable the alt game mode if the sprites can't be loaded.
+                if (!Runner.altGameImageSprite || !Runner.altCommonImageSprite) {
+                    Runner.isAltGameModeEnabled = () => false;
+                    this.altGameModeActive = false;
+                }
+
+                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() {
+                if (!IS_IOS) {
+                    this.audioContext = new AudioContext();
+
+                    const resourceTemplate =
+                        document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
+
+                    for (const sound in Runner.sounds) {
+                        let soundSrc =
+                            resourceTemplate.getElementById(Runner.sounds[sound]).src;
+                        soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
+                        const 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(opt_speed) {
+                const speed = opt_speed || this.currentSpeed;
+
+                // Reduce the speed on smaller mobile screens.
+                if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
+                    const mobileSpeed = Runner.slowDown ? speed :
+                        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() {
+                // Hide the static icon.
+                document.querySelector('.' + Runner.classes.ICON).style.visibility =
+                    'hidden';
+
+                this.adjustDimensions();
+                this.setSpeed();
+
+                const ariaLabel = getA11yString(A11Y_STRINGS.ariaLabel);
+                this.containerEl = document.createElement('div');
+                this.containerEl.setAttribute('role', IS_MOBILE ? 'button' : 'application');
+                this.containerEl.setAttribute('tabindex', '0');
+                this.containerEl.setAttribute('title', ariaLabel);
+
+                this.containerEl.className = Runner.classes.CONTAINER;
+
+                // Player canvas container.
+                this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
+                    this.dimensions.HEIGHT);
+
+                // Live region for game status updates.
+                this.a11yStatusEl = document.createElement('span');
+                this.a11yStatusEl.className = 'offline-runner-live-region';
+                this.a11yStatusEl.setAttribute('aria-live', 'assertive');
+                this.a11yStatusEl.textContent = '';
+                Runner.a11yStatusEl = this.a11yStatusEl;
+
+                // Add checkbox to slow down the game.
+                this.slowSpeedCheckboxLabel = document.createElement('label');
+                this.slowSpeedCheckboxLabel.className = 'slow-speed-option hidden';
+                this.slowSpeedCheckboxLabel.textContent =
+                    getA11yString(A11Y_STRINGS.speedLabel);
+
+                this.slowSpeedCheckbox = document.createElement('input');
+                this.slowSpeedCheckbox.setAttribute('type', 'checkbox');
+                this.slowSpeedCheckbox.setAttribute(
+                    'title', getA11yString(A11Y_STRINGS.speedLabel));
+                this.slowSpeedCheckbox.setAttribute('tabindex', '0');
+                this.slowSpeedCheckbox.setAttribute('checked', 'checked');
+
+                this.slowSpeedToggleEl = document.createElement('span');
+                this.slowSpeedToggleEl.className = 'slow-speed-toggle';
+
+                this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedCheckbox);
+                this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedToggleEl);
+
+                if (IS_IOS) {
+                    this.outerContainerEl.appendChild(this.a11yStatusEl);
+                } else {
+                    this.containerEl.appendChild(this.a11yStatusEl);
+                }
+
+                announcePhrase(getA11yString(A11Y_STRINGS.description));
+
+                this.generatedSoundFx = new GeneratedSoundFx();
+
+                this.canvasCtx =
+        /** @type {CanvasRenderingContext2D} */ (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.outerContainerEl.appendChild(this.slowSpeedCheckboxLabel);
+
+                this.startListening();
+                this.update();
+
+                window.addEventListener(Runner.events.RESIZE,
+                    this.debounceResize.bind(this));
+
+                // Handle dark mode
+                const darkModeMediaQuery =
+                    window.matchMedia('(prefers-color-scheme: dark)');
+                this.isDarkMode = darkModeMediaQuery && darkModeMediaQuery.matches;
+                darkModeMediaQuery.addListener((e) => {
+                    this.isDarkMode = e.matches;
+                });
+            },
+
+            /**
+             * Create the touch controller. A div that covers whole screen.
+             */
+            createTouchController() {
+                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() {
+                if (!this.resizeTimerId_) {
+                    this.resizeTimerId_ =
+                        setInterval(this.adjustDimensions.bind(this), 250);
+                }
+            },
+
+            /**
+             * Adjust game space dimensions on resize.
+             */
+            adjustDimensions() {
+                clearInterval(this.resizeTimerId_);
+                this.resizeTimerId_ = null;
+
+                const boxStyles = window.getComputedStyle(this.outerContainerEl);
+                const 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(this.altGameModeActive, this.tRex);
+                    }
+                }
+            },
+
+            /**
+             * Play the game intro.
+             * Canvas container width expands out to the full width.
+             */
+            playIntro() {
+                if (!this.activated && !this.crashed) {
+                    this.playingIntro = true;
+                    this.tRex.playingIntro = true;
+
+                    // CSS animation definition.
+                    const 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() {
+                if (this.isArcadeMode()) {
+                    this.setArcadeMode();
+                }
+                this.toggleSpeed();
+                this.runningTime = 0;
+                this.playingIntro = false;
+                this.tRex.playingIntro = false;
+                this.containerEl.style.webkitAnimation = '';
+                this.playCount++;
+                this.generatedSoundFx.background();
+                announcePhrase(getA11yString(A11Y_STRINGS.started));
+
+                if (Runner.audioCues) {
+                    this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+                }
+
+                // 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() {
+                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() {
+                return this.containerEl.getBoundingClientRect().top >
+                    Runner.config.CANVAS_IN_VIEW_OFFSET;
+            },
+
+            /**
+             * Enable the alt game mode. Switching out the sprites.
+             */
+            enableAltGameMode() {
+                Runner.imageSprite = Runner.altGameImageSprite;
+                Runner.spriteDefinition = Runner.spriteDefinitionByType[Runner.gameType];
+
+                if (IS_HIDPI) {
+                    this.spriteDef = Runner.spriteDefinition.HDPI;
+                } else {
+                    this.spriteDef = Runner.spriteDefinition.LDPI;
+                }
+
+                this.altGameModeActive = true;
+                this.tRex.enableAltGameMode(this.spriteDef.TREX);
+                this.horizon.enableAltGameMode(this.spriteDef);
+                this.generatedSoundFx.background();
+            },
+
+            /**
+             * Update the game frame and schedules the next one.
+             */
+            update() {
+                this.updatePending = false;
+
+                const now = getTimeStamp();
+                let deltaTime = now - (this.time || now);
+
+                // Flashing when switching game modes.
+                if (this.altGameModeFlashTimer < 0 || this.altGameModeFlashTimer === 0) {
+                    this.altGameModeFlashTimer = null;
+                    this.tRex.setFlashing(false);
+                    this.enableAltGameMode();
+                } else if (this.altGameModeFlashTimer > 0) {
+                    this.altGameModeFlashTimer -= deltaTime;
+                    this.tRex.update(deltaTime);
+                    deltaTime = 0;
+                }
+
+                this.time = now;
+
+                if (this.playing) {
+                    this.clearCanvas();
+
+                    // Additional fade in - Prevents jump when switching sprites
+                    if (this.altGameModeActive &&
+                        this.fadeInTimer <= this.config.FADE_DURATION) {
+                        this.fadeInTimer += deltaTime / 1000;
+                        this.canvasCtx.globalAlpha = this.fadeInTimer;
+                    } else {
+                        this.canvasCtx.globalAlpha = 1;
+                    }
+
+                    if (this.tRex.jumping) {
+                        this.tRex.updateJump(deltaTime);
+                    }
+
+                    this.runningTime += deltaTime;
+                    const 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 if (!this.crashed) {
+                        const showNightMode = this.isDarkMode ^ this.inverted;
+                        deltaTime = !this.activated ? 0 : deltaTime;
+                        this.horizon.update(
+                            deltaTime, this.currentSpeed, hasObstacles, showNightMode);
+                    }
+
+                    // Check for collisions.
+                    let collision = hasObstacles &&
+                        checkForCollision(this.horizon.obstacles[0], this.tRex);
+
+                    // For a11y, audio cues.
+                    if (Runner.audioCues && hasObstacles) {
+                        const jumpObstacle =
+                            this.horizon.obstacles[0].typeConfig.type != 'COLLECTABLE';
+
+                        if (!this.horizon.obstacles[0].jumpAlerted) {
+                            const threshold = Runner.isMobileMouseInput ?
+                                Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y :
+                                Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD;
+                            const adjProximityThreshold = threshold +
+                                (threshold * Math.log10(this.currentSpeed / Runner.config.SPEED));
+
+                            if (this.horizon.obstacles[0].xPos < adjProximityThreshold) {
+                                if (jumpObstacle) {
+                                    this.generatedSoundFx.jump();
+                                }
+                                this.horizon.obstacles[0].jumpAlerted = true;
+                            }
+                        }
+                    }
+
+                    // Activated alt game mode.
+                    if (Runner.isAltGameModeEnabled() && collision &&
+                        this.horizon.obstacles[0].typeConfig.type == 'COLLECTABLE') {
+                        this.horizon.removeFirstObstacle();
+                        this.tRex.setFlashing(true);
+                        collision = false;
+                        this.altGameModeFlashTimer = this.config.FLASH_DURATION;
+                        this.runningTime = 0;
+                        this.generatedSoundFx.collect();
+                    }
+
+                    if (!collision) {
+                        this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
+
+                        if (this.currentSpeed < this.config.MAX_SPEED) {
+                            this.currentSpeed += this.config.ACCELERATION;
+                        }
+                    } else {
+                        this.gameOver();
+                    }
+
+                    const playAchievementSound = this.distanceMeter.update(deltaTime,
+                        Math.ceil(this.distanceRan));
+
+                    if (!Runner.audioCues && playAchievementSound) {
+                        this.playSound(this.soundFx.SCORE);
+                    }
+
+                    // Night mode.
+                    if (!Runner.isAltGameModeEnabled()) {
+                        if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
+                            this.invertTimer = 0;
+                            this.invertTrigger = false;
+                            this.invert(false);
+                        } else if (this.invertTimer) {
+                            this.invertTimer += deltaTime;
+                        } else {
+                            const 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(false);
+                                }
+                            }
+                        }
+                    }
+                }
+
+                if (this.playing || (!this.activated &&
+                    this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
+                    this.tRex.update(deltaTime);
+                    this.scheduleNextUpdate();
+                }
+            },
+
+            /**
+             * Event handler.
+             * @param {Event} e
+             */
+            handleEvent(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;
+                        case events.GAMEPADCONNECTED:
+                            this.onGamepadConnected(e);
+                            break;
+                    }
+                }.bind(this))(e.type, Runner.events);
+            },
+
+            /**
+             * Initialize audio cues if activated by focus on the canvas element.
+             * @param {Event} e
+             */
+            handleCanvasKeyPress(e) {
+                if (!this.activated && !Runner.audioCues) {
+                    this.toggleSpeed();
+                    Runner.audioCues = true;
+                    this.generatedSoundFx.init();
+                    Runner.generatedSoundFx = this.generatedSoundFx;
+                    Runner.config.CLEAR_TIME *= 1.2;
+                } else if (e.keyCode && Runner.keycodes.JUMP[e.keyCode]) {
+                    this.onKeyDown(e);
+                }
+            },
+
+            /**
+             * Prevent space key press from scrolling.
+             * @param {Event} e
+             */
+            preventScrolling(e) {
+                if (e.keyCode === 32) {
+                    e.preventDefault();
+                }
+            },
+
+            /**
+             * Toggle speed setting if toggle is shown.
+             */
+            toggleSpeed() {
+                if (Runner.audioCues) {
+                    const speedChange = Runner.slowDown != this.slowSpeedCheckbox.checked;
+
+                    if (speedChange) {
+                        Runner.slowDown = this.slowSpeedCheckbox.checked;
+                        const updatedConfig =
+                            Runner.slowDown ? Runner.slowConfig : Runner.normalConfig;
+
+                        Runner.config = Object.assign(Runner.config, updatedConfig);
+                        this.currentSpeed = updatedConfig.SPEED;
+                        this.tRex.enableSlowConfig();
+                        this.horizon.adjustObstacleSpeed();
+                    }
+                    if (this.playing) {
+                        this.disableSpeedToggle(true);
+                    }
+                }
+            },
+
+            /**
+             * Show the speed toggle.
+             * From focus event or when audio cues are activated.
+             * @param {Event=} e
+             */
+            showSpeedToggle(e) {
+                const isFocusEvent = e && e.type == 'focus';
+                if (Runner.audioCues || isFocusEvent) {
+                    this.slowSpeedCheckboxLabel.classList.toggle(
+                        HIDDEN_CLASS, isFocusEvent ? false : !this.crashed);
+                }
+            },
+
+            /**
+             * Disable the speed toggle.
+             * @param {boolean} disable
+             */
+            disableSpeedToggle(disable) {
+                if (disable) {
+                    this.slowSpeedCheckbox.setAttribute('disabled', 'disabled');
+                } else {
+                    this.slowSpeedCheckbox.removeAttribute('disabled');
+                }
+            },
+
+            /**
+             * Bind relevant key / mouse / touch listeners.
+             */
+            startListening() {
+                // A11y keyboard / screen reader activation.
+                this.containerEl.addEventListener(
+                    Runner.events.KEYDOWN, this.handleCanvasKeyPress.bind(this));
+                if (!IS_MOBILE) {
+                    this.containerEl.addEventListener(
+                        Runner.events.FOCUS, this.showSpeedToggle.bind(this));
+                }
+                this.canvas.addEventListener(
+                    Runner.events.KEYDOWN, this.preventScrolling.bind(this));
+                this.canvas.addEventListener(
+                    Runner.events.KEYUP, this.preventScrolling.bind(this));
+
+                // 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);
+
+                if (this.isArcadeMode()) {
+                    // Gamepad
+                    window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
+                }
+            },
+
+            /**
+             * Remove all listeners.
+             */
+            stopListening() {
+                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);
+
+                if (this.isArcadeMode()) {
+                    window.removeEventListener(Runner.events.GAMEPADCONNECTED, this);
+                }
+            },
+
+            /**
+             * Process keydown.
+             * @param {Event} e
+             */
+            onKeyDown(e) {
+                // Prevent native page scrolling whilst tapping on mobile.
+                if (IS_MOBILE && this.playing) {
+                    e.preventDefault();
+                }
+
+                if (this.isCanvasInView()) {
+                    // Allow toggling of speed toggle.
+                    if (Runner.keycodes.JUMP[e.keyCode] &&
+                        e.target == this.slowSpeedCheckbox) {
+                        return;
+                    }
+
+                    if (!this.crashed && !this.paused) {
+                        // For a11y, screen reader activation.
+                        const isMobileMouseInput = IS_MOBILE &&
+                            e.type === Runner.events.POINTERDOWN &&
+                            e.pointerType == 'mouse' && e.target == this.containerEl ||
+                            (IS_IOS && e.pointerType == 'touch' &&
+                                document.activeElement == this.containerEl);
+
+                        if (Runner.keycodes.JUMP[e.keyCode] ||
+                            e.type === Runner.events.TOUCHSTART || isMobileMouseInput ||
+                            (Runner.keycodes.DUCK[e.keyCode] && this.altGameModeActive)) {
+                            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();
+                                }
+
+                                if (isMobileMouseInput) {
+                                    this.handleCanvasKeyPress(e);
+                                }
+                                this.loadSounds();
+                                this.setPlayStatus(true);
+                                this.update();
+                                if (window.errorPageController) {
+                                    errorPageController.trackEasterEgg();
+                                }
+                            }
+                            // Start jump.
+                            if (!this.tRex.jumping && !this.tRex.ducking) {
+                                if (Runner.audioCues) {
+                                    this.generatedSoundFx.cancelFootSteps();
+                                } else {
+                                    this.playSound(this.soundFx.BUTTON_PRESS);
+                                }
+                                this.tRex.startJump(this.currentSpeed);
+                            }
+                            // Ducking is disabled on alt game modes.
+                        } else if (
+                            !this.altGameModeActive && 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);
+                            }
+                        }
+                    }
+                }
+            },
+
+            /**
+             * Process key up.
+             * @param {Event} e
+             */
+            onKeyUp(e) {
+                const keyCode = String(e.keyCode);
+                const 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.
+                    const 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();
+                }
+            },
+
+            /**
+             * Process gamepad connected event.
+             * @param {Event} e
+             */
+            onGamepadConnected(e) {
+                if (!this.pollingGamepads) {
+                    this.pollGamepadState();
+                }
+            },
+
+            /**
+             * rAF loop for gamepad polling.
+             */
+            pollGamepadState() {
+                const gamepads = navigator.getGamepads();
+                this.pollActiveGamepad(gamepads);
+
+                this.pollingGamepads = true;
+                requestAnimationFrame(this.pollGamepadState.bind(this));
+            },
+
+            /**
+             * Polls for a gamepad with the jump button pressed. If one is found this
+             * becomes the "active" gamepad and all others are ignored.
+             * @param {!Array<Gamepad>} gamepads
+             */
+            pollForActiveGamepad(gamepads) {
+                for (let i = 0; i < gamepads.length; ++i) {
+                    if (gamepads[i] && gamepads[i].buttons.length > 0 &&
+                        gamepads[i].buttons[0].pressed) {
+                        this.gamepadIndex = i;
+                        this.pollActiveGamepad(gamepads);
+                        return;
+                    }
+                }
+            },
+
+            /**
+             * Polls the chosen gamepad for button presses and generates KeyboardEvents
+             * to integrate with the rest of the game logic.
+             * @param {!Array<Gamepad>} gamepads
+             */
+            pollActiveGamepad(gamepads) {
+                if (this.gamepadIndex === undefined) {
+                    this.pollForActiveGamepad(gamepads);
+                    return;
+                }
+
+                const gamepad = gamepads[this.gamepadIndex];
+                if (!gamepad) {
+                    this.gamepadIndex = undefined;
+                    this.pollForActiveGamepad(gamepads);
+                    return;
+                }
+
+                // The gamepad specification defines the typical mapping of physical buttons
+                // to button indicies: https://w3c.github.io/gamepad/#remapping
+                this.pollGamepadButton(gamepad, 0, 38);  // Jump
+                if (gamepad.buttons.length >= 2) {
+                    this.pollGamepadButton(gamepad, 1, 40);  // Duck
+                }
+                if (gamepad.buttons.length >= 10) {
+                    this.pollGamepadButton(gamepad, 9, 13);  // Restart
+                }
+
+                this.previousGamepad = gamepad;
+            },
+
+            /**
+             * Generates a key event based on a gamepad button.
+             * @param {!Gamepad} gamepad
+             * @param {number} buttonIndex
+             * @param {number} keyCode
+             */
+            pollGamepadButton(gamepad, buttonIndex, keyCode) {
+                const state = gamepad.buttons[buttonIndex].pressed;
+                let previousState = false;
+                if (this.previousGamepad) {
+                    previousState = this.previousGamepad.buttons[buttonIndex].pressed;
+                }
+                // Generate key events on the rising and falling edge of a button press.
+                if (state !== previousState) {
+                    const e = new KeyboardEvent(state ? Runner.events.KEYDOWN
+                        : Runner.events.KEYUP,
+                        { keyCode: keyCode });
+                    document.dispatchEvent(e);
+                }
+            },
+
+            /**
+             * 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(e) {
+                if (e.target != this.slowSpeedCheckbox) {
+                    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(e) {
+                return e.button != null && e.button < 2 &&
+                    e.type === Runner.events.POINTERUP &&
+                    (e.target === this.canvas ||
+                        (IS_MOBILE && Runner.audioCues && e.target === this.containerEl));
+            },
+
+            /**
+             * RequestAnimationFrame wrapper.
+             */
+            scheduleNextUpdate() {
+                if (!this.updatePending) {
+                    this.updatePending = true;
+                    this.raqId = requestAnimationFrame(this.update.bind(this));
+                }
+            },
+
+            /**
+             * Whether the game is running.
+             * @return {boolean}
+             */
+            isRunning() {
+                return !!this.raqId;
+            },
+
+            /**
+             * Set the initial high score as stored in the user's profile.
+             * @param {number} highScore
+             */
+            initializeHighScore(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(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() {
+                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) {
+                    const origSpriteDef = IS_HIDPI ?
+                        Runner.spriteDefinitionByType.original.HDPI :
+                        Runner.spriteDefinitionByType.original.LDPI;
+
+                    if (this.canvas) {
+                        if (Runner.isAltGameModeEnabled) {
+                            this.gameOverPanel = new GameOverPanel(
+                                this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+                                this.dimensions, origSpriteDef.ALT_GAME_END,
+                                this.altGameModeActive);
+                        } else {
+                            this.gameOverPanel = new GameOverPanel(
+                                this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+                                this.dimensions);
+                        }
+                    }
+                }
+
+                this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+
+                // Update the high score.
+                if (this.distanceRan > this.highestScore) {
+                    this.saveHighScore(this.distanceRan);
+                }
+
+                // Reset the time clock.
+                this.time = getTimeStamp();
+
+                if (Runner.audioCues) {
+                    this.generatedSoundFx.stopAll();
+                    announcePhrase(
+                        getA11yString(A11Y_STRINGS.gameOver)
+                            .replace(
+                                '$1',
+                                this.distanceMeter.getActualDistance(this.distanceRan)
+                                    .toString()) +
+                        ' ' +
+                        getA11yString(A11Y_STRINGS.highScore)
+                            .replace(
+                                '$1',
+
+                                this.distanceMeter.getActualDistance(this.highestScore)
+                                    .toString()));
+                    this.containerEl.setAttribute(
+                        'title', getA11yString(A11Y_STRINGS.ariaLabel));
+                }
+                this.showSpeedToggle();
+                this.disableSpeedToggle(false);
+            },
+
+            stop() {
+                this.setPlayStatus(false);
+                this.paused = true;
+                cancelAnimationFrame(this.raqId);
+                this.raqId = 0;
+                this.generatedSoundFx.stopAll();
+            },
+
+            play() {
+                if (!this.crashed) {
+                    this.setPlayStatus(true);
+                    this.paused = false;
+                    this.tRex.update(0, Trex.status.RUNNING);
+                    this.time = getTimeStamp();
+                    this.update();
+                    this.generatedSoundFx.background();
+                }
+            },
+
+            restart() {
+                if (!this.raqId) {
+                    this.playCount++;
+                    this.runningTime = 0;
+                    this.setPlayStatus(true);
+                    this.toggleSpeed();
+                    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.horizon.reset();
+                    this.tRex.reset();
+                    this.playSound(this.soundFx.BUTTON_PRESS);
+                    this.invert(true);
+                    this.flashTimer = null;
+                    this.update();
+                    this.gameOverPanel.reset();
+                    this.generatedSoundFx.background();
+                    this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+                    announcePhrase(getA11yString(A11Y_STRINGS.started));
+                }
+            },
+
+            setPlayStatus(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() {
+                // In RTL languages the title is wrapped with the left to right mark
+                // control characters &#x202A; and &#x202C but are invisible.
+                return IS_RTL ? document.title.indexOf(ARCADE_MODE_URL) == 1 :
+                    document.title === ARCADE_MODE_URL;
+            },
+
+            /**
+             * Hides offline messaging for a fullscreen game only experience.
+             */
+            setArcadeMode() {
+                document.body.classList.add(Runner.classes.ARCADE_MODE);
+                this.setArcadeModeContainerScale();
+            },
+
+            /**
+             * Sets the scaling for arcade mode.
+             */
+            setArcadeModeContainerScale() {
+                const windowHeight = window.innerHeight;
+                const scaleHeight = windowHeight / this.dimensions.HEIGHT;
+                const scaleWidth = window.innerWidth / this.dimensions.WIDTH;
+                const scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
+                const scaledCanvasHeight = this.dimensions.HEIGHT * scale;
+                // Positions the game container at 10% of the available vertical window
+                // height minus the game container height.
+                const translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
+                    Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
+                    Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
+                    window.devicePixelRatio;
+
+                const cssScale = IS_RTL ? -scale + ',' + scale : scale;
+                this.containerEl.style.transform =
+                    'scale(' + cssScale + ') translateY(' + translateY + 'px)';
+            },
+
+            /**
+             * Pause the game if the tab is not in focus.
+             */
+            onVisibilityChange(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 {AudioBuffer} soundBuffer
+             */
+            playSound(soundBuffer) {
+                if (soundBuffer) {
+                    const sourceNode = this.audioContext.createBufferSource();
+                    sourceNode.buffer = soundBuffer;
+                    sourceNode.connect(this.audioContext.destination);
+                    sourceNode.start(0);
+                }
+            },
+
+            /**
+             * Inverts the current page / canvas colors.
+             * @param {boolean} reset Whether to reset colors.
+             */
+            invert(reset) {
+                const 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) {
+            const context =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+
+            // Query the various pixel ratios
+            const devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
+            /** @suppress {missingProperties} */
+            const backingStoreRatio =
+                Math.floor(context.webkitBackingStorePixelRatio) || 1;
+            const ratio = devicePixelRatio / backingStoreRatio;
+
+            // Upscale the canvas if the two ratios don't match
+            if (devicePixelRatio !== backingStoreRatio) {
+                const oldWidth = opt_width || canvas.width;
+                const 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;
+        };
+
+
+        /**
+         * Whether events are enabled.
+         * @return {boolean}
+         */
+        Runner.isAltGameModeEnabled = function () {
+            return loadTimeData && loadTimeData.valueExists('enableAltGameMode');
+        };
+
+
+        /**
+         * Generated sound FX class for audio cues.
+         * @constructor
+         */
+        function GeneratedSoundFx() {
+            this.audioCues = false;
+            this.context = null;
+            this.panner = null;
+        }
+
+        GeneratedSoundFx.prototype = {
+            init() {
+                this.audioCues = true;
+                if (!this.context) {
+                    // iOS only supports the webkit version.
+                    this.context = window.webkitAudioContext ? new webkitAudioContext() :
+                        new AudioContext();
+                    if (IS_IOS) {
+                        this.context.onstatechange = (function () {
+                            if (this.context.state != 'running') {
+                                this.context.resume();
+                            }
+                        }).bind(this);
+                        this.context.resume();
+                    }
+                    this.panner = this.context.createStereoPanner ?
+                        this.context.createStereoPanner() :
+                        null;
+                }
+            },
+
+            stopAll() {
+                this.cancelFootSteps();
+            },
+
+            /**
+             * Play oscillators at certain frequency and for a certain time.
+             * @param {number} frequency
+             * @param {number} startTime
+             * @param {number} duration
+             * @param {?number=} opt_vol
+             * @param {number=} opt_pan
+             */
+            playNote(frequency, startTime, duration, opt_vol, opt_pan) {
+                const osc1 = this.context.createOscillator();
+                const osc2 = this.context.createOscillator();
+                const volume = this.context.createGain();
+
+                // Set oscillator wave type
+                osc1.type = 'triangle';
+                osc2.type = 'triangle';
+                volume.gain.value = 0.1;
+
+                // Set up node routing
+                if (this.panner) {
+                    this.panner.pan.value = opt_pan || 0;
+                    osc1.connect(volume).connect(this.panner);
+                    osc2.connect(volume).connect(this.panner);
+                    this.panner.connect(this.context.destination);
+                } else {
+                    osc1.connect(volume);
+                    osc2.connect(volume);
+                    volume.connect(this.context.destination);
+                }
+
+                // Detune oscillators for chorus effect
+                osc1.frequency.value = frequency + 1;
+                osc2.frequency.value = frequency - 2;
+
+                // Fade out
+                volume.gain.setValueAtTime(opt_vol || 0.01, startTime + duration - 0.05);
+                volume.gain.linearRampToValueAtTime(0.00001, startTime + duration);
+
+                // Start oscillators
+                osc1.start(startTime);
+                osc2.start(startTime);
+                // Stop oscillators
+                osc1.stop(startTime + duration);
+                osc2.stop(startTime + duration);
+            },
+
+            background() {
+                if (this.audioCues) {
+                    const now = this.context.currentTime;
+                    this.playNote(493.883, now, 0.116);
+                    this.playNote(659.255, now + 0.116, 0.232);
+                    this.loopFootSteps();
+                }
+            },
+
+            loopFootSteps() {
+                if (this.audioCues && !this.bgSoundIntervalId) {
+                    this.bgSoundIntervalId = setInterval(function () {
+                        this.playNote(73.42, this.context.currentTime, 0.05, 0.16);
+                        this.playNote(69.30, this.context.currentTime + 0.116, 0.116, 0.16);
+                    }.bind(this), 280);
+                }
+            },
+
+            cancelFootSteps() {
+                if (this.audioCues && this.bgSoundIntervalId) {
+                    clearInterval(this.bgSoundIntervalId);
+                    this.bgSoundIntervalId = null;
+                    this.playNote(103.83, this.context.currentTime, 0.232, 0.02);
+                    this.playNote(116.54, this.context.currentTime + 0.116, 0.232, 0.02);
+                }
+            },
+
+            collect() {
+                if (this.audioCues) {
+                    this.cancelFootSteps();
+                    const now = this.context.currentTime;
+                    this.playNote(830.61, now, 0.116);
+                    this.playNote(1318.51, now + 0.116, 0.232);
+                }
+            },
+
+            jump() {
+                if (this.audioCues) {
+                    const now = this.context.currentTime;
+                    this.playNote(659.25, now, 0.116, 0.3, -0.6);
+                    this.playNote(880, now + 0.116, 0.232, 0.3, -0.6);
+                }
+            },
+        };
+
+
+        /**
+         * Speak a phrase using Speech Synthesis API for a11y.
+         * @param {string} phrase Sentence to speak.
+         */
+        function speakPhrase(phrase) {
+            if ('speechSynthesis' in window) {
+                const msg = new SpeechSynthesisUtterance(phrase);
+                const voices = window.speechSynthesis.getVoices();
+                msg.text = phrase;
+                speechSynthesis.speak(msg);
+            }
+        }
+
+
+        /**
+         * For screen readers make an announcement to the live region.
+         * @param {string} phrase Sentence to speak.
+         */
+        function announcePhrase(phrase) {
+            if (Runner.a11yStatusEl) {
+                Runner.a11yStatusEl.textContent = '';
+                Runner.a11yStatusEl.textContent = phrase;
+            }
+        }
+
+
+        /**
+         * Returns a string from loadTimeData data object.
+         * @param {string} stringName
+         * @return {string}
+         */
+        function getA11yString(stringName) {
+            return loadTimeData && loadTimeData.valueExists(stringName) ?
+                loadTimeData.getString(stringName) :
+                '';
+        }
+
+
+        /**
+         * Get random number.
+         * @param {number} min
+         * @param {number} max
+         */
+        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 {Element} 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) {
+            const canvas =
+      /** @type {!HTMLCanvasElement} */ (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) {
+            const len = (base64String.length / 4) * 3;
+            const str = atob(base64String);
+            const arrayBuffer = new ArrayBuffer(len);
+            const bytes = new Uint8Array(arrayBuffer);
+
+            for (let 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.
+         * @param {Object=} opt_altGameEndImgPos
+         * @param {boolean=} opt_altGameActive
+         * @constructor
+         */
+        function GameOverPanel(
+            canvas, textImgPos, restartImgPos, dimensions, opt_altGameEndImgPos,
+            opt_altGameActive) {
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+            this.canvasDimensions = dimensions;
+            this.textImgPos = textImgPos;
+            this.restartImgPos = restartImgPos;
+            this.altGameEndImgPos = opt_altGameEndImgPos;
+            this.altGameModeActive = opt_altGameActive;
+
+            // Retry animation.
+            this.frameTimeStamp = 0;
+            this.animTimer = 0;
+            this.currentFrame = 0;
+
+            this.gameOverRafId = null;
+
+            this.flashTimer = 0;
+            this.flashCounter = 0;
+            this.originalText = true;
+        }
+
+        GameOverPanel.RESTART_ANIM_DURATION = 875;
+        GameOverPanel.LOGO_PAUSE_DURATION = 875;
+        GameOverPanel.FLASH_ITERATIONS = 5;
+
+        /**
+         * Animation frames spec.
+         */
+        GameOverPanel.animConfig = {
+            frames: [0, 36, 72, 108, 144, 180, 216, 252],
+            msPerFrame: GameOverPanel.RESTART_ANIM_DURATION / 8,
+        };
+
+        /**
+         * 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(width, opt_height) {
+                this.canvasDimensions.WIDTH = width;
+                if (opt_height) {
+                    this.canvasDimensions.HEIGHT = opt_height;
+                }
+                this.currentFrame = GameOverPanel.animConfig.frames.length - 1;
+            },
+
+            drawGameOverText(dimensions, opt_useAltText) {
+                const centerX = this.canvasDimensions.WIDTH / 2;
+                let textSourceX = dimensions.TEXT_X;
+                let textSourceY = dimensions.TEXT_Y;
+                let textSourceWidth = dimensions.TEXT_WIDTH;
+                let textSourceHeight = dimensions.TEXT_HEIGHT;
+
+                const textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
+                const textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
+                const textTargetWidth = dimensions.TEXT_WIDTH;
+                const textTargetHeight = dimensions.TEXT_HEIGHT;
+
+                if (IS_HIDPI) {
+                    textSourceY *= 2;
+                    textSourceX *= 2;
+                    textSourceWidth *= 2;
+                    textSourceHeight *= 2;
+                }
+
+                if (!opt_useAltText) {
+                    textSourceX += this.textImgPos.x;
+                    textSourceY += this.textImgPos.y;
+                }
+
+                const spriteSource =
+                    opt_useAltText ? Runner.altCommonImageSprite : Runner.origImageSprite;
+
+                this.canvasCtx.save();
+
+                if (IS_RTL) {
+                    this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+                    this.canvasCtx.scale(-1, 1);
+                }
+
+                // Game over text from sprite.
+                this.canvasCtx.drawImage(
+                    spriteSource, textSourceX, textSourceY, textSourceWidth,
+                    textSourceHeight, textTargetX, textTargetY, textTargetWidth,
+                    textTargetHeight);
+
+                this.canvasCtx.restore();
+            },
+
+            /**
+             * Draw additional adornments for alternative game types.
+             */
+            drawAltGameElements(tRex) {
+                // Additional adornments.
+                if (this.altGameModeActive && Runner.spriteDefinition.ALT_GAME_END_CONFIG) {
+                    const altGameEndConfig = Runner.spriteDefinition.ALT_GAME_END_CONFIG;
+
+                    let altGameEndSourceWidth = altGameEndConfig.WIDTH;
+                    let altGameEndSourceHeight = altGameEndConfig.HEIGHT;
+                    const altGameEndTargetX = tRex.xPos + altGameEndConfig.X_OFFSET;
+                    const altGameEndTargetY = tRex.yPos + altGameEndConfig.Y_OFFSET;
+
+                    if (IS_HIDPI) {
+                        altGameEndSourceWidth *= 2;
+                        altGameEndSourceHeight *= 2;
+                    }
+
+                    this.canvasCtx.drawImage(
+                        Runner.altCommonImageSprite, this.altGameEndImgPos.x,
+                        this.altGameEndImgPos.y, altGameEndSourceWidth,
+                        altGameEndSourceHeight, altGameEndTargetX, altGameEndTargetY,
+                        altGameEndConfig.WIDTH, altGameEndConfig.HEIGHT);
+                }
+            },
+
+            /**
+             * Draw restart button.
+             */
+            drawRestartButton() {
+                const dimensions = GameOverPanel.dimensions;
+                let framePosX = GameOverPanel.animConfig.frames[this.currentFrame];
+                let restartSourceWidth = dimensions.RESTART_WIDTH;
+                let restartSourceHeight = dimensions.RESTART_HEIGHT;
+                const restartTargetX =
+                    (this.canvasDimensions.WIDTH / 2) - (dimensions.RESTART_WIDTH / 2);
+                const restartTargetY = this.canvasDimensions.HEIGHT / 2;
+
+                if (IS_HIDPI) {
+                    restartSourceWidth *= 2;
+                    restartSourceHeight *= 2;
+                    framePosX *= 2;
+                }
+
+                this.canvasCtx.save();
+
+                if (IS_RTL) {
+                    this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+                    this.canvasCtx.scale(-1, 1);
+                }
+
+                this.canvasCtx.drawImage(
+                    Runner.origImageSprite, this.restartImgPos.x + framePosX,
+                    this.restartImgPos.y, restartSourceWidth, restartSourceHeight,
+                    restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
+                    dimensions.RESTART_HEIGHT);
+                this.canvasCtx.restore();
+            },
+
+
+            /**
+             * Draw the panel.
+             * @param {boolean} opt_altGameModeActive
+             * @param {!Trex} opt_tRex
+             */
+            draw(opt_altGameModeActive, opt_tRex) {
+                if (opt_altGameModeActive) {
+                    this.altGameModeActive = opt_altGameModeActive;
+                }
+
+                this.drawGameOverText(GameOverPanel.dimensions, false);
+                this.drawRestartButton();
+                this.drawAltGameElements(opt_tRex);
+                this.update();
+            },
+
+            /**
+             * Update animation frames.
+             */
+            update() {
+                const now = getTimeStamp();
+                const deltaTime = now - (this.frameTimeStamp || now);
+
+                this.frameTimeStamp = now;
+                this.animTimer += deltaTime;
+                this.flashTimer += deltaTime;
+
+                // Restart Button
+                if (this.currentFrame == 0 &&
+                    this.animTimer > GameOverPanel.LOGO_PAUSE_DURATION) {
+                    this.animTimer = 0;
+                    this.currentFrame++;
+                    this.drawRestartButton();
+                } else if (
+                    this.currentFrame > 0 &&
+                    this.currentFrame < GameOverPanel.animConfig.frames.length) {
+                    if (this.animTimer >= GameOverPanel.animConfig.msPerFrame) {
+                        this.currentFrame++;
+                        this.drawRestartButton();
+                    }
+                } else if (
+                    !this.altGameModeActive &&
+                    this.currentFrame == GameOverPanel.animConfig.frames.length) {
+                    this.reset();
+                    return;
+                }
+
+                // Game over text
+                if (this.altGameModeActive &&
+                    Runner.spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG) {
+                    const altTextConfig =
+                        Runner.spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG;
+
+                    if (this.flashCounter < GameOverPanel.FLASH_ITERATIONS &&
+                        this.flashTimer > altTextConfig.FLASH_DURATION) {
+                        this.flashTimer = 0;
+                        this.originalText = !this.originalText;
+
+                        this.clearGameOverTextBounds();
+                        if (this.originalText) {
+                            this.drawGameOverText(GameOverPanel.dimensions, false);
+                            this.flashCounter++;
+                        } else {
+                            this.drawGameOverText(altTextConfig, true);
+                        }
+                    } else if (this.flashCounter >= GameOverPanel.FLASH_ITERATIONS) {
+                        this.reset();
+                        return;
+                    }
+                }
+
+                this.gameOverRafId = requestAnimationFrame(this.update.bind(this));
+            },
+
+            /**
+             * Clear game over text.
+             */
+            clearGameOverTextBounds() {
+                this.canvasCtx.save();
+
+                this.canvasCtx.clearRect(
+                    Math.round(
+                        this.canvasDimensions.WIDTH / 2 -
+                        (GameOverPanel.dimensions.TEXT_WIDTH / 2)),
+                    Math.round((this.canvasDimensions.HEIGHT - 25) / 3),
+                    GameOverPanel.dimensions.TEXT_WIDTH,
+                    GameOverPanel.dimensions.TEXT_HEIGHT + 4);
+                this.canvasCtx.restore();
+            },
+
+            reset() {
+                if (this.gameOverRafId) {
+                    cancelAnimationFrame(this.gameOverRafId);
+                    this.gameOverRafId = null;
+                }
+                this.animTimer = 0;
+                this.frameTimeStamp = 0;
+                this.currentFrame = 0;
+                this.flashTimer = 0;
+                this.flashCounter = 0;
+                this.originalText = true;
+            },
+        };
+
+
+        //******************************************************************************
+
+        /**
+         * Check for a collision.
+         * @param {!Obstacle} obstacle
+         * @param {!Trex} tRex T-rex object.
+         * @param {CanvasRenderingContext2D=} opt_canvasCtx Optional canvas context for
+         *    drawing collision boxes.
+         * @return {Array<CollisionBox>|undefined}
+         */
+        function checkForCollision(obstacle, tRex, opt_canvasCtx) {
+            const 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.
+            const tRexBox = new CollisionBox(
+                tRex.xPos + 1,
+                tRex.yPos + 1,
+                tRex.config.WIDTH - 2,
+                tRex.config.HEIGHT - 2);
+
+            const 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)) {
+                const collisionBoxes = obstacle.collisionBoxes;
+                let tRexCollisionBoxes = [];
+
+                if (Runner.isAltGameModeEnabled()) {
+                    tRexCollisionBoxes = Runner.spriteDefinition.TREX.COLLISION_BOXES;
+                } else {
+                    tRexCollisionBoxes = tRex.ducking ? Trex.collisionBoxes.DUCKING :
+                        Trex.collisionBoxes.RUNNING;
+                }
+
+                // Detailed axis aligned box check.
+                for (let t = 0; t < tRexCollisionBoxes.length; t++) {
+                    for (let i = 0; i < collisionBoxes.length; i++) {
+                        // Adjust the box to actual positions.
+                        const adjTrexBox =
+                            createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
+                        const adjObstacleBox =
+                            createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
+                        const crashed = boxCompare(adjTrexBox, adjObstacleBox);
+
+                        // Draw boxes for debug.
+                        if (opt_canvasCtx) {
+                            drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
+                        }
+
+                        if (crashed) {
+                            return [adjTrexBox, adjObstacleBox];
+                        }
+                    }
+                }
+            }
+        }
+
+
+        /**
+         * 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) {
+            let crashed = false;
+            const tRexBoxX = tRexBox.x;
+            const tRexBoxY = tRexBox.y;
+
+            const obstacleBoxX = obstacleBox.x;
+            const 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.
+         * @constructor
+         */
+        function CollisionBox(x, y, w, h) {
+            this.x = x;
+            this.y = y;
+            this.width = w;
+            this.height = h;
+        }
+
+
+        //******************************************************************************
+
+        /**
+         * Obstacle.
+         * @param {CanvasRenderingContext2D} canvasCtx
+         * @param {ObstacleType} type
+         * @param {Object} spriteImgPos Obstacle position in sprite.
+         * @param {Object} dimensions
+         * @param {number} gapCoefficient Mutipler in determining the gap.
+         * @param {number} speed
+         * @param {number=} opt_xOffset
+         * @param {boolean=} opt_isAltGameMode
+         * @constructor
+         */
+        function Obstacle(
+            canvasCtx, type, spriteImgPos, dimensions, gapCoefficient, speed,
+            opt_xOffset, opt_isAltGameMode) {
+            this.canvasCtx = canvasCtx;
+            this.spritePos = spriteImgPos;
+            this.typeConfig = type;
+            this.gapCoefficient = Runner.slowDown ? gapCoefficient * 2 : 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;
+            this.altGameModeActive = opt_isAltGameMode;
+            this.imageSprite = this.typeConfig.type == 'COLLECTABLE' ?
+                Runner.altCommonImageSprite :
+                this.altGameModeActive ? Runner.altGameImageSprite : Runner.imageSprite;
+
+            // For animated obstacles.
+            this.currentFrame = 0;
+            this.timer = 0;
+
+            this.init(speed);
+        }
+
+        /**
+         * Coefficient for calculating the maximum gap.
+         */
+        Obstacle.MAX_GAP_COEFFICIENT = 1.5;
+
+        /**
+         * Maximum obstacle grouping count.
+         */
+        Obstacle.MAX_OBSTACLE_LENGTH = 3;
+
+
+        Obstacle.prototype = {
+            /**
+             * Initialise the DOM for the obstacle.
+             * @param {number} speed
+             */
+            init(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)) {
+                    const 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);
+
+                // Increase gap for audio cues enabled.
+                if (Runner.audioCues) {
+                    this.gap *= 2;
+                }
+            },
+
+            /**
+             * Draw and crop based on size.
+             */
+            draw() {
+                let sourceWidth = this.typeConfig.width;
+                let sourceHeight = this.typeConfig.height;
+
+                if (IS_HIDPI) {
+                    sourceWidth = sourceWidth * 2;
+                    sourceHeight = sourceHeight * 2;
+                }
+
+                // X position in sprite.
+                let 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(
+                    this.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(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(gapCoefficient, speed) {
+                const minGap = Math.round(
+                    this.width * speed + this.typeConfig.minGap * gapCoefficient);
+                const 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() {
+                return this.xPos + this.width > 0;
+            },
+
+            /**
+             * Make a copy of the collision boxes, since these will change based on
+             * obstacle type and size.
+             */
+            cloneCollisionBoxes() {
+                const collisionBoxes = this.typeConfig.collisionBoxes;
+
+                for (let i = collisionBoxes.length - 1; i >= 0; i--) {
+                    this.collisionBoxes[i] = new CollisionBox(
+                        collisionBoxes[i].x, collisionBoxes[i].y, collisionBoxes[i].width,
+                        collisionBoxes[i].height);
+                }
+            },
+        };
+
+
+        //******************************************************************************
+        /**
+         * T-rex game character.
+         * @param {HTMLCanvasElement} canvas
+         * @param {Object} spritePos Positioning within image sprite.
+         * @constructor
+         */
+        function Trex(canvas, spritePos) {
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (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 = Object.assign(Trex.config, Trex.normalJumpConfig);
+            // 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.altGameModeEnabled = false;
+            this.flashing = false;
+
+            this.init();
+        }
+
+
+        /**
+         * T-rex player config.
+         */
+        Trex.config = {
+            DROP_VELOCITY: -5,
+            FLASH_OFF: 175,
+            FLASH_ON: 100,
+            HEIGHT: 47,
+            HEIGHT_DUCK: 25,
+            INTRO_DURATION: 1500,
+            SPEED_DROP_COEFFICIENT: 3,
+            SPRITE_WIDTH: 262,
+            START_X_POS: 50,
+            WIDTH: 44,
+            WIDTH_DUCK: 59,
+        };
+
+        Trex.slowJumpConfig = {
+            GRAVITY: 0.25,
+            MAX_JUMP_HEIGHT: 50,
+            MIN_JUMP_HEIGHT: 45,
+            INITIAL_JUMP_VELOCITY: -20,
+        };
+
+        Trex.normalJumpConfig = {
+            GRAVITY: 0.6,
+            MAX_JUMP_HEIGHT: 30,
+            MIN_JUMP_HEIGHT: 30,
+            INITIAL_JUMP_VELOCITY: -10,
+        };
+
+        /**
+         * Used in collision detection.
+         * @enum {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() {
+                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);
+            },
+
+            /**
+             * Assign the appropriate jump parameters based on the game speed.
+             */
+            enableSlowConfig: function () {
+                const jumpConfig =
+                    Runner.slowDown ? Trex.slowJumpConfig : Trex.normalJumpConfig;
+                Trex.config = Object.assign(Trex.config, jumpConfig);
+
+                this.adjustAltGameConfigForSlowSpeed();
+            },
+
+            /**
+             * Enables the alternative game. Redefines the dino config.
+             * @param {Object} spritePos New positioning within image sprite.
+             */
+            enableAltGameMode: function (spritePos) {
+                this.altGameModeEnabled = true;
+                this.spritePos = spritePos;
+                const spriteDefinition = Runner.spriteDefinition['TREX'];
+
+                // Update animation frames.
+                Trex.animFrames.RUNNING.frames =
+                    [spriteDefinition.RUNNING_1.x, spriteDefinition.RUNNING_2.x];
+                Trex.animFrames.CRASHED.frames = [spriteDefinition.CRASHED.x];
+
+                if (typeof spriteDefinition.JUMPING.x == 'object') {
+                    Trex.animFrames.JUMPING.frames = spriteDefinition.JUMPING.x;
+                } else {
+                    Trex.animFrames.JUMPING.frames = [spriteDefinition.JUMPING.x];
+                }
+
+                Trex.animFrames.DUCKING.frames =
+                    [spriteDefinition.RUNNING_1.x, spriteDefinition.RUNNING_2.x];
+
+                // Update Trex config
+                Trex.config.GRAVITY = spriteDefinition.GRAVITY || Trex.config.GRAVITY;
+                Trex.config.HEIGHT = spriteDefinition.RUNNING_1.h,
+                    Trex.config.INITIAL_JUMP_VELOCITY = spriteDefinition.INITIAL_JUMP_VELOCITY;
+                Trex.config.MAX_JUMP_HEIGHT = spriteDefinition.MAX_JUMP_HEIGHT;
+                Trex.config.MIN_JUMP_HEIGHT = spriteDefinition.MIN_JUMP_HEIGHT;
+                Trex.config.WIDTH = spriteDefinition.RUNNING_1.w;
+                Trex.config.WIDTH_JUMP = spriteDefinition.JUMPING.w;
+                Trex.config.INVERT_JUMP = spriteDefinition.INVERT_JUMP;
+
+                this.adjustAltGameConfigForSlowSpeed(spriteDefinition.GRAVITY);
+                this.config = Trex.config;
+
+                // Adjust bottom horizon placement.
+                this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+                    Runner.spriteDefinition['BOTTOM_PAD'];
+                this.yPos = this.groundYPos;
+                this.reset();
+            },
+
+            /**
+             * Slow speeds adjustments for the alt game modes.
+             * @param {number=} opt_gravityValue
+             */
+            adjustAltGameConfigForSlowSpeed: function (opt_gravityValue) {
+                if (Runner.slowDown) {
+                    if (opt_gravityValue) {
+                        Trex.config.GRAVITY = opt_gravityValue / 1.5;
+                    }
+                    Trex.config.MIN_JUMP_HEIGHT *= 1.5;
+                    Trex.config.MAX_JUMP_HEIGHT *= 1.5;
+                    Trex.config.INITIAL_JUMP_VELOCITY =
+                        Trex.config.INITIAL_JUMP_VELOCITY * 1.5;
+                }
+            },
+
+            /**
+             * Setter whether dino is flashing.
+             * @param {boolean} status
+             */
+            setFlashing: function (status) {
+                this.flashing = status;
+            },
+
+            /**
+             * Setter for the jump velocity.
+             * The approriate drop velocity is also set.
+             * @param {number} setting
+             */
+            setJumpVelocity(setting) {
+                this.config.INITIAL_JUMP_VELOCITY = -setting;
+                this.config.DROP_VELOCITY = -setting / 2;
+            },
+
+            /**
+             * Set the animation status.
+             * @param {!number} deltaTime
+             * @param {Trex.status=} opt_status Optional status to switch to.
+             */
+            update(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.flashing && this.timer >= this.msPerFrame) {
+                    this.currentFrame = this.currentFrame ==
+                        this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
+                    this.timer = 0;
+                }
+
+                if (!this.altGameModeEnabled) {
+                    // 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(x, y) {
+                let sourceX = x;
+                let sourceY = y;
+                let sourceWidth = this.ducking && this.status !== Trex.status.CRASHED ?
+                    this.config.WIDTH_DUCK :
+                    this.config.WIDTH;
+                let sourceHeight = this.config.HEIGHT;
+                const outputHeight = sourceHeight;
+
+                let jumpOffset = Runner.spriteDefinition.TREX.JUMPING.xOffset;
+
+                // Width of sprite changes on jump.
+                if (this.altGameModeEnabled && this.jumping &&
+                    this.status !== Trex.status.CRASHED) {
+                    sourceWidth = this.config.WIDTH_JUMP;
+                }
+
+                if (IS_HIDPI) {
+                    sourceX *= 2;
+                    sourceY *= 2;
+                    sourceWidth *= 2;
+                    sourceHeight *= 2;
+                    jumpOffset *= 2;
+                }
+
+                // Adjustments for sprite sheet position.
+                sourceX += this.spritePos.x;
+                sourceY += this.spritePos.y;
+
+                // Flashing.
+                if (this.flashing) {
+                    if (this.timer < this.config.FLASH_ON) {
+                        this.canvasCtx.globalAlpha = 0.5;
+                    } else if (this.timer > this.config.FLASH_OFF) {
+                        this.timer = 0;
+                    }
+                }
+
+                // Ducking.
+                if (!this.altGameModeEnabled && 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 if (
+                    this.altGameModeEnabled && this.jumping &&
+                    this.status !== Trex.status.CRASHED) {
+                    // Jumping with adjustments.
+                    this.canvasCtx.drawImage(
+                        Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+                        this.xPos - jumpOffset, this.yPos, this.config.WIDTH_JUMP,
+                        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() {
+                this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
+            },
+
+            /**
+             * Make t-rex blink at random intervals.
+             * @param {number} time Current time in milliseconds.
+             */
+            blink(time) {
+                const 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(speed) {
+                if (!this.jumping) {
+                    this.update(0, Trex.status.JUMPING);
+                    // Tweak the jump velocity based on the speed.
+                    this.jumpVelocity = this.config.INITIAL_JUMP_VELOCITY - (speed / 10);
+                    this.jumping = true;
+                    this.reachedMinHeight = false;
+                    this.speedDrop = false;
+
+                    if (this.config.INVERT_JUMP) {
+                        this.minJumpHeight = this.groundYPos + this.config.MIN_JUMP_HEIGHT;
+                    }
+                }
+            },
+
+            /**
+             * Jump is complete, falling down.
+             */
+            endJump() {
+                if (this.reachedMinHeight &&
+                    this.jumpVelocity < this.config.DROP_VELOCITY) {
+                    this.jumpVelocity = this.config.DROP_VELOCITY;
+                }
+            },
+
+            /**
+             * Update frame for a jump.
+             * @param {number} deltaTime
+             */
+            updateJump(deltaTime) {
+                const msPerFrame = Trex.animFrames[this.status].msPerFrame;
+                const 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 if (this.config.INVERT_JUMP) {
+                    this.yPos -= Math.round(this.jumpVelocity * framesElapsed);
+                } else {
+                    this.yPos += Math.round(this.jumpVelocity * framesElapsed);
+                }
+
+                this.jumpVelocity += this.config.GRAVITY * framesElapsed;
+
+                // Minimum height has been reached.
+                if (this.config.INVERT_JUMP && (this.yPos > this.minJumpHeight) ||
+                    !this.config.INVERT_JUMP && (this.yPos < this.minJumpHeight) ||
+                    this.speedDrop) {
+                    this.reachedMinHeight = true;
+                }
+
+                // Reached max height.
+                if (this.config.INVERT_JUMP && (this.yPos > -this.config.MAX_JUMP_HEIGHT) ||
+                    !this.config.INVERT_JUMP && (this.yPos < this.config.MAX_JUMP_HEIGHT) ||
+                    this.speedDrop) {
+                    this.endJump();
+                }
+
+                // Back down at ground level. Jump completed.
+                if ((this.config.INVERT_JUMP && this.yPos) < this.groundYPos ||
+                    (!this.config.INVERT_JUMP && this.yPos) > this.groundYPos) {
+                    this.reset();
+                    this.jumpCount++;
+
+                    if (Runner.audioCues) {
+                        Runner.generatedSoundFx.loopFootSteps();
+                    }
+                }
+            },
+
+            /**
+             * Set the speed drop. Immediately cancels the current jump.
+             */
+            setSpeedDrop() {
+                this.speedDrop = true;
+                this.jumpVelocity = 1;
+            },
+
+            /**
+             * @param {boolean} isDucking
+             */
+            setDuck(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() {
+                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 =
+      /** @type {CanvasRenderingContext2D} */ (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.canvasWidth = canvasWidth;
+            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(width) {
+                let maxDistanceStr = '';
+
+                this.calcXPos(width);
+                this.maxScore = this.maxScoreUnits;
+                for (let i = 0; i < this.maxScoreUnits; i++) {
+                    this.draw(i, 0);
+                    this.defaultString += '0';
+                    maxDistanceStr += '9';
+                }
+
+                this.maxScore = parseInt(maxDistanceStr, 10);
+            },
+
+            /**
+             * Calculate the xPos in the canvas.
+             * @param {number} canvasWidth
+             */
+            calcXPos(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(digitPos, value, opt_highScore) {
+                let sourceWidth = DistanceMeter.dimensions.WIDTH;
+                let sourceHeight = DistanceMeter.dimensions.HEIGHT;
+                let sourceX = DistanceMeter.dimensions.WIDTH * value;
+                let sourceY = 0;
+
+                const targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
+                const targetY = this.y;
+                const targetWidth = DistanceMeter.dimensions.WIDTH;
+                const 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 (IS_RTL) {
+                    if (opt_highScore) {
+                        this.canvasCtx.translate(
+                            this.canvasWidth -
+                            (DistanceMeter.dimensions.WIDTH * (this.maxScoreUnits + 3)),
+                            this.y);
+                    } else {
+                        this.canvasCtx.translate(
+                            this.canvasWidth - DistanceMeter.dimensions.WIDTH, this.y);
+                    }
+                    this.canvasCtx.scale(-1, 1);
+                } else {
+                    const highScoreX =
+                        this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH;
+                    if (opt_highScore) {
+                        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(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(deltaTime, distance) {
+                let paint = true;
+                let 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', 10);
+                    } else {
+                        this.distance = 0;
+                    }
+
+                    if (distance > 0) {
+                        // Achievement 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.
+                        const 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 (let i = this.digits.length - 1; i >= 0; i--) {
+                        this.draw(i, parseInt(this.digits[i], 10));
+                    }
+                }
+
+                this.drawHighScore();
+                return playSound;
+            },
+
+            /**
+             * Draw the high score.
+             */
+            drawHighScore() {
+                if (parseInt(this.highScore, 10) > 0) {
+                    this.canvasCtx.save();
+                    this.canvasCtx.globalAlpha = .8;
+                    for (let 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(distance) {
+                distance = this.getActualDistance(distance);
+                const highScoreStr = (this.defaultString +
+                    distance).substr(-this.maxScoreUnits);
+
+                this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
+            },
+
+
+            /**
+             * Whether a clicked is in the high score area.
+             * @param {Event} e Event object.
+             * @return {boolean} Whether the click was in the high score bounds.
+             */
+            hasClickedOnHighScore(e) {
+                let x = 0;
+                let y = 0;
+
+                if (e.touches) {
+                    // Bounds for touch differ from pointer.
+                    const 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() {
+                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() {
+                const now = getTimeStamp();
+                const deltaTime = now - (this.frameTimeStamp || now);
+                let 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() {
+                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() {
+                if (this.flashingRafId) {
+                    cancelAnimationFrame(this.flashingRafId);
+                }
+                this.flashIterations = 0;
+                this.flashTimer = 0;
+                this.highScoreFlashing = false;
+                this.clearHighScoreBounds();
+                this.drawHighScore();
+            },
+
+            /**
+             * Clear the high score.
+             */
+            resetHighScore() {
+                this.setHighScore(0);
+                this.cancelHighScoreFlashing();
+            },
+
+            /**
+             * Reset the distance meter back to '00000'.
+             */
+            reset() {
+                this.update(0, 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
+         * @constructor
+         */
+        function Cloud(canvas, spritePos, containerWidth) {
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+            this.spritePos = spritePos;
+            this.containerWidth = containerWidth;
+            this.xPos = containerWidth;
+            this.yPos = 0;
+            this.remove = false;
+            this.gap =
+                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() {
+                this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
+                    Cloud.config.MIN_SKY_LEVEL);
+                this.draw();
+            },
+
+            /**
+             * Draw the cloud.
+             */
+            draw() {
+                this.canvasCtx.save();
+                let sourceWidth = Cloud.config.WIDTH;
+                let sourceHeight = Cloud.config.HEIGHT;
+                const outputWidth = sourceWidth;
+                const 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(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() {
+                return this.xPos + Cloud.config.WIDTH > 0;
+            },
+        };
+
+
+        /**
+         * Background item.
+         * Similar to cloud, without random y position.
+         * @param {HTMLCanvasElement} canvas Canvas element.
+         * @param {Object} spritePos Position of image in sprite.
+         * @param {number} containerWidth
+         * @param {string} type Element type.
+         * @constructor
+         */
+        function BackgroundEl(canvas, spritePos, containerWidth, type) {
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+            this.spritePos = spritePos;
+            this.containerWidth = containerWidth;
+            this.xPos = containerWidth;
+            this.yPos = 0;
+            this.remove = false;
+            this.type = type;
+            this.gap =
+                getRandomNum(BackgroundEl.config.MIN_GAP, BackgroundEl.config.MAX_GAP);
+            this.animTimer = 0;
+            this.switchFrames = false;
+
+            this.spriteConfig = {};
+            this.init();
+        }
+
+        /**
+         * Background element object config.
+         * Real values assigned when game type changes.
+         * @enum {number}
+         */
+        BackgroundEl.config = {
+            MAX_BG_ELS: 0,
+            MAX_GAP: 0,
+            MIN_GAP: 0,
+            POS: 0,
+            SPEED: 0,
+            Y_POS: 0,
+            MS_PER_FRAME: 0,  // only needed when BACKGROUND_EL.FIXED is true
+        };
+
+
+        BackgroundEl.prototype = {
+            /**
+             * Initialise the element setting the y position.
+             */
+            init() {
+                this.spriteConfig = Runner.spriteDefinition.BACKGROUND_EL[this.type];
+                if (this.spriteConfig.FIXED) {
+                    this.xPos = this.spriteConfig.FIXED_X_POS;
+                }
+                this.yPos = BackgroundEl.config.Y_POS - this.spriteConfig.HEIGHT +
+                    this.spriteConfig.OFFSET;
+                this.draw();
+            },
+
+            /**
+             * Draw the element.
+             */
+            draw() {
+                this.canvasCtx.save();
+                let sourceWidth = this.spriteConfig.WIDTH;
+                let sourceHeight = this.spriteConfig.HEIGHT;
+                let sourceX = this.spriteConfig.X_POS;
+                const outputWidth = sourceWidth;
+                const outputHeight = sourceHeight;
+
+                if (IS_HIDPI) {
+                    sourceWidth *= 2;
+                    sourceHeight *= 2;
+                    sourceX *= 2;
+                }
+
+                this.canvasCtx.drawImage(
+                    Runner.imageSprite, sourceX, this.spritePos.y, sourceWidth,
+                    sourceHeight, this.xPos, this.yPos, outputWidth, outputHeight);
+
+                this.canvasCtx.restore();
+            },
+
+            /**
+             * Update the background element position.
+             * @param {number} speed
+             */
+            update(speed) {
+                if (!this.remove) {
+                    if (this.spriteConfig.FIXED) {
+                        this.animTimer += speed;
+                        if (this.animTimer > BackgroundEl.config.MS_PER_FRAME) {
+                            this.animTimer = 0;
+                            this.switchFrames = !this.switchFrames;
+                        }
+
+                        if (this.spriteConfig.FIXED_Y_POS_1 &&
+                            this.spriteConfig.FIXED_Y_POS_2) {
+                            this.yPos = this.switchFrames ? this.spriteConfig.FIXED_Y_POS_1 :
+                                this.spriteConfig.FIXED_Y_POS_2;
+                        }
+                    } else {
+                        // Fixed speed, regardless of actual game speed.
+                        this.xPos -= BackgroundEl.config.SPEED;
+                    }
+                    this.draw();
+
+                    // Mark as removable if no longer in the canvas.
+                    if (!this.isVisible()) {
+                        this.remove = true;
+                    }
+                }
+            },
+
+            /**
+             * Check if the element is visible on the stage.
+             * @return {boolean}
+             */
+            isVisible() {
+                return this.xPos + this.spriteConfig.WIDTH > 0;
+            },
+        };
+
+
+
+        //******************************************************************************
+
+        /**
+         * Nightmode shows a moon and stars on the horizon.
+         * @param {HTMLCanvasElement} canvas
+         * @param {number} spritePos
+         * @param {number} containerWidth
+         * @constructor
+         */
+        function NightMode(canvas, spritePos, containerWidth) {
+            this.spritePos = spritePos;
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (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.
+             */
+            update(activated) {
+                // 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 (let 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(currentPos, speed) {
+                if (currentPos < -NightMode.config.WIDTH) {
+                    currentPos = this.containerWidth;
+                } else {
+                    currentPos -= speed;
+                }
+                return currentPos;
+            },
+
+            draw() {
+                let moonSourceWidth = this.currentPhase === 3 ? NightMode.config.WIDTH * 2 :
+                    NightMode.config.WIDTH;
+                let moonSourceHeight = NightMode.config.HEIGHT;
+                let moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
+                const moonOutputWidth = moonSourceWidth;
+                let starSize = NightMode.config.STAR_SIZE;
+                let starSourceX = Runner.spriteDefinitionByType.original.LDPI.STAR.x;
+
+                if (IS_HIDPI) {
+                    moonSourceWidth *= 2;
+                    moonSourceHeight *= 2;
+                    moonSourceX = this.spritePos.x +
+                        (NightMode.phases[this.currentPhase] * 2);
+                    starSize *= 2;
+                    starSourceX = Runner.spriteDefinitionByType.original.HDPI.STAR.x;
+                }
+
+                this.canvasCtx.save();
+                this.canvasCtx.globalAlpha = this.opacity;
+
+                // Stars.
+                if (this.drawStars) {
+                    for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+                        this.canvasCtx.drawImage(
+                            Runner.origImageSprite, 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.origImageSprite, 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() {
+                const segmentSize = Math.round(this.containerWidth /
+                    NightMode.config.NUM_STARS);
+
+                for (let 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.spriteDefinitionByType.original.HDPI.STAR.y +
+                            NightMode.config.STAR_SIZE * 2 * i;
+                    } else {
+                        this.stars[i].sourceY =
+                            Runner.spriteDefinitionByType.original.LDPI.STAR.y +
+                            NightMode.config.STAR_SIZE * i;
+                    }
+                }
+            },
+
+            reset() {
+                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} lineConfig Configuration object.
+         * @constructor
+         */
+        function HorizonLine(canvas, lineConfig) {
+            let sourceX = lineConfig.SOURCE_X;
+            let sourceY = lineConfig.SOURCE_Y;
+
+            if (IS_HIDPI) {
+                sourceX *= 2;
+                sourceY *= 2;
+            }
+
+            this.spritePos = { x: sourceX, y: sourceY };
+            this.canvas = canvas;
+            this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+            this.sourceDimensions = {};
+            this.dimensions = lineConfig;
+
+            this.sourceXPos = [this.spritePos.x, this.spritePos.x +
+                this.dimensions.WIDTH];
+            this.xPos = [];
+            this.yPos = 0;
+            this.bumpThreshold = 0.5;
+
+            this.setSourceDimensions(lineConfig);
+            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(newDimensions) {
+                for (const dimension in newDimensions) {
+                    if (dimension !== 'SOURCE_X' && dimension !== 'SOURCE_Y') {
+                        if (IS_HIDPI) {
+                            if (dimension !== 'YPOS') {
+                                this.sourceDimensions[dimension] = newDimensions[dimension] * 2;
+                            }
+                        } else {
+                            this.sourceDimensions[dimension] = newDimensions[dimension];
+                        }
+                        this.dimensions[dimension] = newDimensions[dimension];
+                    }
+                }
+
+                this.xPos = [0, newDimensions.WIDTH];
+                this.yPos = newDimensions.YPOS;
+            },
+
+            /**
+             * Return the crop x position of a type.
+             */
+            getRandomType() {
+                return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
+            },
+
+            /**
+             * Draw the horizon line.
+             */
+            draw() {
+                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(pos, increment) {
+                const line1 = pos;
+                const 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(deltaTime, speed) {
+                const 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() {
+                this.xPos[0] = 0;
+                this.xPos[1] = this.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 =
+      /** @type {CanvasRenderingContext2D} */ (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;
+            this.altGameModeActive = false;
+
+            // Cloud
+            this.clouds = [];
+            this.cloudSpeed = this.config.BG_CLOUD_SPEED;
+
+            // Background elements
+            this.backgroundEls = [];
+            this.lastEl = null;
+            this.backgroundSpeed = this.config.BG_CLOUD_SPEED;
+
+            // Horizon
+            this.horizonLine = null;
+            this.horizonLines = [];
+            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() {
+                Obstacle.types = Runner.spriteDefinitionByType.original.OBSTACLES;
+                this.addCloud();
+                // Multiple Horizon lines
+                for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+                    this.horizonLines.push(
+                        new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+                }
+
+                this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
+                    this.dimensions.WIDTH);
+            },
+
+            /**
+             * Update obstacle definitions based on the speed of the game.
+             */
+            adjustObstacleSpeed: function () {
+                for (let i = 0; i < Obstacle.types.length; i++) {
+                    if (Runner.slowDown) {
+                        Obstacle.types[i].multipleSpeed = Obstacle.types[i].multipleSpeed / 2;
+                        Obstacle.types[i].minGap *= 1.5;
+                        Obstacle.types[i].minSpeed = Obstacle.types[i].minSpeed / 2;
+
+                        // Convert variable y position obstacles to fixed.
+                        if (typeof (Obstacle.types[i].yPos) == 'object') {
+                            Obstacle.types[i].yPos = Obstacle.types[i].yPos[0];
+                            Obstacle.types[i].yPosMobile = Obstacle.types[i].yPos[0];
+                        }
+                    }
+                }
+            },
+
+            /**
+             * Update sprites to correspond to change in sprite sheet.
+             * @param {number} spritePos
+             */
+            enableAltGameMode: function (spritePos) {
+                // Clear existing horizon objects.
+                this.clouds = [];
+                this.backgroundEls = [];
+
+                this.altGameModeActive = true;
+                this.spritePos = spritePos;
+
+                Obstacle.types = Runner.spriteDefinition.OBSTACLES;
+                this.adjustObstacleSpeed();
+
+                Obstacle.MAX_GAP_COEFFICIENT = Runner.spriteDefinition.MAX_GAP_COEFFICIENT;
+                Obstacle.MAX_OBSTACLE_LENGTH = Runner.spriteDefinition.MAX_OBSTACLE_LENGTH;
+
+                BackgroundEl.config = Runner.spriteDefinition.BACKGROUND_EL_CONFIG;
+
+                this.horizonLines = [];
+                for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+                    this.horizonLines.push(
+                        new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+                }
+                this.reset();
+            },
+
+            /**
+             * @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(deltaTime, currentSpeed, updateObstacles, showNightMode) {
+                this.runningTime += deltaTime;
+
+                if (this.altGameModeActive) {
+                    this.updateBackgroundEls(deltaTime, currentSpeed);
+                }
+
+                for (let i = 0; i < this.horizonLines.length; i++) {
+                    this.horizonLines[i].update(deltaTime, currentSpeed);
+                }
+
+                if (!this.altGameModeActive || Runner.spriteDefinition.HAS_CLOUDS) {
+                    this.nightMode.update(showNightMode);
+                    this.updateClouds(deltaTime, currentSpeed);
+                }
+
+                if (updateObstacles) {
+                    this.updateObstacles(deltaTime, currentSpeed);
+                }
+            },
+
+            /**
+             * Update background element positions. Also handles creating new elements.
+             * @param {number} elSpeed
+             * @param {Array<Object>} bgElArray
+             * @param {number} maxBgEl
+             * @param {Function} bgElAddFunction
+             * @param {number} frequency
+             */
+            updateBackgroundEl(elSpeed, bgElArray, maxBgEl, bgElAddFunction, frequency) {
+                const numElements = bgElArray.length;
+
+                if (numElements) {
+                    for (let i = numElements - 1; i >= 0; i--) {
+                        bgElArray[i].update(elSpeed);
+                    }
+
+                    const lastEl = bgElArray[numElements - 1];
+
+                    // Check for adding a new element.
+                    if (numElements < maxBgEl &&
+                        (this.dimensions.WIDTH - lastEl.xPos) > lastEl.gap &&
+                        frequency > Math.random()) {
+                        bgElAddFunction();
+                    }
+                } else {
+                    bgElAddFunction();
+                }
+            },
+
+            /**
+             * Update the cloud positions.
+             * @param {number} deltaTime
+             * @param {number} speed
+             */
+            updateClouds(deltaTime, speed) {
+                const elSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
+                this.updateBackgroundEl(
+                    elSpeed, this.clouds, this.config.MAX_CLOUDS, this.addCloud.bind(this),
+                    this.cloudFrequency);
+
+                // Remove expired elements.
+                this.clouds = this.clouds.filter((obj) => !obj.remove);
+            },
+
+            /**
+             * Update the background element positions.
+             * @param {number} deltaTime
+             * @param {number} speed
+             */
+            updateBackgroundEls(deltaTime, speed) {
+                this.updateBackgroundEl(
+                    deltaTime, this.backgroundEls, BackgroundEl.config.MAX_BG_ELS,
+                    this.addBackgroundEl.bind(this), this.cloudFrequency);
+
+                // Remove expired elements.
+                this.backgroundEls = this.backgroundEls.filter((obj) => !obj.remove);
+            },
+
+            /**
+             * Update the obstacle positions.
+             * @param {number} deltaTime
+             * @param {number} currentSpeed
+             */
+            updateObstacles(deltaTime, currentSpeed) {
+                const updatedObstacles = this.obstacles.slice(0);
+
+                for (let i = 0; i < this.obstacles.length; i++) {
+                    const 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) {
+                    const 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() {
+                this.obstacles.shift();
+            },
+
+            /**
+             * Add a new obstacle.
+             * @param {number} currentSpeed
+             */
+            addNewObstacle(currentSpeed) {
+                const obstacleCount =
+                    Obstacle.types[Obstacle.types.length - 1].type != 'COLLECTABLE' ||
+                        (Runner.isAltGameModeEnabled() && !this.altGameModeActive ||
+                            this.altGameModeActive) ?
+                        Obstacle.types.length - 1 :
+                        Obstacle.types.length - 2;
+                const obstacleTypeIndex =
+                    obstacleCount > 0 ? getRandomNum(0, obstacleCount) : 0;
+                const obstacleType = Obstacle.types[obstacleTypeIndex];
+
+                // Check for multiples of the same type of obstacle.
+                // Also check obstacle is available at current speed.
+                if ((obstacleCount > 0 && this.duplicateObstacleCheck(obstacleType.type)) ||
+                    currentSpeed < obstacleType.minSpeed) {
+                    this.addNewObstacle(currentSpeed);
+                } else {
+                    const obstacleSpritePos = this.spritePos[obstacleType.type];
+
+                    this.obstacles.push(new Obstacle(
+                        this.canvasCtx, obstacleType, obstacleSpritePos, this.dimensions,
+                        this.gapCoefficient, currentSpeed, obstacleType.width,
+                        this.altGameModeActive));
+
+                    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(nextObstacleType) {
+                let duplicateCount = 0;
+
+                for (let 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() {
+                this.obstacles = [];
+                for (let l = 0; l < this.horizonLines.length; l++) {
+                    this.horizonLines[l].reset();
+                }
+
+                this.nightMode.reset();
+            },
+
+            /**
+             * Update the canvas width and scaling.
+             * @param {number} width Canvas width.
+             * @param {number} height Canvas height.
+             */
+            resize(width, height) {
+                this.canvas.width = width;
+                this.canvas.height = height;
+            },
+
+            /**
+             * Add a new cloud to the horizon.
+             */
+            addCloud() {
+                this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
+                    this.dimensions.WIDTH));
+            },
+
+            /**
+             * Add a random background element to the horizon.
+             */
+            addBackgroundEl() {
+                const backgroundElTypes =
+                    Object.keys(Runner.spriteDefinition.BACKGROUND_EL);
+
+                if (backgroundElTypes.length > 0) {
+                    let index = getRandomNum(0, backgroundElTypes.length - 1);
+                    let type = backgroundElTypes[index];
+
+                    // Add variation if available.
+                    while (type == this.lastEl && backgroundElTypes.length > 1) {
+                        index = getRandomNum(0, backgroundElTypes.length - 1);
+                        type = backgroundElTypes[index];
+                    }
+
+                    this.lastEl = type;
+                    this.backgroundEls.push(new BackgroundEl(
+                        this.canvas, this.spritePos.BACKGROUND_EL, this.dimensions.WIDTH,
+                        type));
+                }
+            },
+        };
+    </script>
+    <script>// Copyright 2021 The Chromium Authors
+        // Use of this source code is governed by a BSD-style license that can be
+        // found in the LICENSE file.
+
+        /* @const
+         * Add matching sprite definition and config to Runner.spriteDefinitionByType.
+         */
+        const GAME_TYPE = [];
+
+        /**
+         * Obstacle definitions.
+         * minGap: minimum pixel space between 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.
+         *
+         * @typedef {{
+         *   type: string,
+         *   width: number,
+         *   height: number,
+         *   yPos: number,
+         *   multipleSpeed: number,
+         *   minGap: number,
+         *   minSpeed: number,
+         *   collisionBoxes: Array<CollisionBox>,
+         * }}
+         */
+        let ObstacleType;
+
+        /**
+         * T-Rex runner sprite definitions.
+         */
+        Runner.spriteDefinitionByType = {
+            original: {
+                LDPI: {
+                    BACKGROUND_EL: { x: 86, y: 2 },
+                    CACTUS_LARGE: { x: 332, y: 2 },
+                    CACTUS_SMALL: { x: 228, y: 2 },
+                    OBSTACLE_2: { x: 332, y: 2 },
+                    OBSTACLE: { 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: 68 },
+                    TEXT_SPRITE: { x: 655, y: 2 },
+                    TREX: { x: 848, y: 2 },
+                    STAR: { x: 645, y: 2 },
+                    COLLECTABLE: { x: 2, y: 2 },
+                    ALT_GAME_END: { x: 121, y: 2 },
+                },
+                HDPI: {
+                    BACKGROUND_EL: { x: 166, y: 2 },
+                    CACTUS_LARGE: { x: 652, y: 2 },
+                    CACTUS_SMALL: { x: 446, y: 2 },
+                    OBSTACLE_2: { x: 652, y: 2 },
+                    OBSTACLE: { 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: 130 },
+                    TEXT_SPRITE: { x: 1294, y: 2 },
+                    TREX: { x: 1678, y: 2 },
+                    STAR: { x: 1276, y: 2 },
+                    COLLECTABLE: { x: 4, y: 4 },
+                    ALT_GAME_END: { x: 242, y: 4 },
+                },
+                MAX_GAP_COEFFICIENT: 1.5,
+                MAX_OBSTACLE_LENGTH: 3,
+                HAS_CLOUDS: 1,
+                BOTTOM_PAD: 10,
+                TREX: {
+                    WAITING_1: { x: 44, w: 44, h: 47, xOffset: 0 },
+                    WAITING_2: { x: 0, w: 44, h: 47, xOffset: 0 },
+                    RUNNING_1: { x: 88, w: 44, h: 47, xOffset: 0 },
+                    RUNNING_2: { x: 132, w: 44, h: 47, xOffset: 0 },
+                    JUMPING: { x: 0, w: 44, h: 47, xOffset: 0 },
+                    CRASHED: { x: 220, w: 44, h: 47, xOffset: 0 },
+                    COLLISION_BOXES: [
+                        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),
+                    ],
+                },
+                /** @type {Array<ObstacleType>} */
+                OBSTACLES: [
+                    {
+                        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,
+                    },
+                ],
+                BACKGROUND_EL: {
+                    'CLOUD': {
+                        HEIGHT: 14,
+                        MAX_CLOUD_GAP: 400,
+                        MAX_SKY_LEVEL: 30,
+                        MIN_CLOUD_GAP: 100,
+                        MIN_SKY_LEVEL: 71,
+                        OFFSET: 4,
+                        WIDTH: 46,
+                        X_POS: 1,
+                        Y_POS: 120,
+                    },
+                },
+                BACKGROUND_EL_CONFIG: {
+                    MAX_BG_ELS: 1,
+                    MAX_GAP: 400,
+                    MIN_GAP: 100,
+                    POS: 0,
+                    SPEED: 0.5,
+                    Y_POS: 125,
+                },
+                LINES: [
+                    { SOURCE_X: 2, SOURCE_Y: 52, WIDTH: 600, HEIGHT: 12, YPOS: 127 },
+                ],
+            },
+        };
+    </script>
+
+</head>
+
+<body id="t" class="neterror" style="font-family: 'Segoe UI',Arial,'Microsoft Yahei',sans-serif; font-size: 75%"
+    jstcache="0">
+    <div id="main-frame-error" class="interstitial-wrapper" jstcache="0">
+        <div id="main-content" jstcache="0">
+            <div class="icon icon-offline" jstcache="0" style="visibility: hidden;"></div>
+            <div id="main-message" jstcache="0">
+                <h1 jstcache="0">
+                    <span jsselect="heading" jsvalues=".innerHTML:msg" jstcache="9">按空格键即可开始游戏</span>
+                    <a id="error-information-button" class="hidden" onclick="toggleErrorInformationPopup();"
+                        jstcache="0"></a>
+                </h1>
+                <p jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1" style="display: none;"></p>
+                <!--The suggestion list and error code are normally presented inline,
+          in which case error-information-popup-* divs have no effect. When
+          error-information-popup-container has the use-popup-container class, this
+          information is provided in a popup instead.-->
+                <div id="error-information-popup-container" jstcache="0">
+                    <div id="error-information-popup" jstcache="0">
+                        <div id="error-information-popup-box" jstcache="0">
+                            <div id="error-information-popup-content" jstcache="0">
+                                <div id="suggestions-list" style="display:none"
+                                    jsdisplay="(suggestionsSummaryList &amp;&amp; suggestionsSummaryList.length)"
+                                    jstcache="16">
+                                    <p jsvalues=".innerHTML:suggestionsSummaryListHeader" jstcache="18"></p>
+                                    <ul jsvalues=".className:suggestionsSummaryList.length == 1 ? 'single-suggestion' : ''"
+                                        jstcache="19">
+                                        <li jsselect="suggestionsSummaryList" jsvalues=".innerHTML:summary"
+                                            jstcache="21"></li>
+                                    </ul>
+                                </div>
+                                <div class="error-code" jscontent="errorCode" jstcache="17"></div>
+                                <p id="error-information-popup-close" jstcache="0">
+                                    <a class="link-button" jscontent="closeDescriptionPopup"
+                                        onclick="toggleErrorInformationPopup();" jstcache="20">null</a>
+                                </p>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+                <div id="download-links-wrapper" class="hidden" jstcache="0">
+                    <div id="download-link-wrapper" jstcache="0">
+                        <a id="download-link" class="link-button" onclick="downloadButtonClick()"
+                            jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6"
+                            style="display: none;">
+                        </a>
+                    </div>
+                    <div id="download-link-clicked-wrapper" class="hidden" jstcache="0">
+                        <div id="download-link-clicked" class="link-button" jsselect="downloadButton"
+                            jscontent="disabledMsg" jstcache="11" style="display: none;">
+                        </div>
+                    </div>
+                </div>
+                <div id="save-page-for-later-button" class="hidden" jstcache="0">
+                    <a class="link-button" onclick="savePageLaterClick()" jsselect="savePageLater"
+                        jscontent="savePageMsg" jstcache="10" style="display: none;">
+                    </a>
+                </div>
+                <div id="cancel-save-page-button" class="hidden" onclick="cancelSavePageClick()"
+                    jsselect="savePageLater" jsvalues=".innerHTML:cancelMsg" jstcache="4" style="display: none;">
+                </div>
+                <div id="offline-content-list" class="list-hidden" hidden="" jstcache="0">
+                    <div id="offline-content-list-visibility-card" onclick="toggleOfflineContentListVisibility(true)"
+                        jstcache="0">
+                        <div id="offline-content-list-title" jsselect="offlineContentList" jscontent="title"
+                            jstcache="12" style="display: none;">
+                        </div>
+                        <div jstcache="0">
+                            <div id="offline-content-list-show-text" jsselect="offlineContentList" jscontent="showText"
+                                jstcache="14" style="display: none;">
+                            </div>
+                            <div id="offline-content-list-hide-text" jsselect="offlineContentList" jscontent="hideText"
+                                jstcache="15" style="display: none;">
+                            </div>
+                        </div>
+                    </div>
+                    <div id="offline-content-suggestions" jstcache="0"></div>
+                    <div id="offline-content-list-action" jstcache="0">
+                        <a class="link-button" onclick="launchDownloadsPage()" jsselect="offlineContentList"
+                            jscontent="actionText" jstcache="13" style="display: none;">
+                        </a>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="buttons" class="nav-wrapper suggested-left" jstcache="0">
+            <div id="control-buttons" hidden="" jstcache="0">
+                <button id="reload-button" class="blue-button text-button" onclick="reloadButtonClick(this.url);"
+                    jsselect="reloadButton" jsvalues=".url:reloadUrl" jscontent="msg" jstcache="5"
+                    style="display: none;"></button>
+                <button id="download-button" class="blue-button text-button" onclick="downloadButtonClick()"
+                    jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6"
+                    style="display: none;">
+                </button>
+            </div>
+            <button id="details-button" class="secondary-button text-button small-link singular"
+                onclick="detailsButtonClick(); toggleHelpBox()" jscontent="details"
+                jsdisplay="(suggestionsDetails &amp;&amp; suggestionsDetails.length > 0) || diagnose"
+                jsvalues=".detailsText:details; .hideDetailsText:hideDetails;" jstcache="2"
+                style="display: none;"></button>
+        </div>
+        <div id="details" class="hidden" jstcache="0">
+            <div class="suggestions" jsselect="suggestionsDetails" jstcache="3" style="display: none;">
+                <div class="suggestion-header" jsvalues=".innerHTML:header" jstcache="7"></div>
+                <div class="suggestion-body" jsvalues=".innerHTML:body" jstcache="8"></div>
+            </div>
+        </div>
+        <div role="application" tabindex="0" title="恐龙游戏，玩" class="runner-container"><canvas class="runner-canvas"
+                width="600" height="150" style="width: 600px; height: 150px;"></canvas><span
+                class="offline-runner-live-region"
+                aria-live="assertive">恐龙游戏。在这款游戏中，您要协助一头正在荒野中奔跑的像素化恐龙躲避仙人掌和翼手龙。您只需在听到提示音时按一下空格键，即可让恐龙跃过障碍物。</span></div>
+        <label class="slow-speed-option hidden">启用慢速模式<input type="checkbox" title="启用慢速模式" tabindex="0"
+                checked="checked"><span class="slow-speed-toggle"></span></label>
+    </div>
+    <div id="sub-frame-error" jstcache="0">
+        <!-- Show details when hovering over the icon, in case the details are
+         hidden because they're too large. -->
+        <div class="icon" jstcache="0"></div>
+        <div id="sub-frame-error-details" jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1"
+            style="display: none;"></div>
+    </div>
+
+    <div id="offline-resources" jstcache="0">
+        <img id="offline-resources-1x"
+            src="data:image/png;base64,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"
+            jstcache="0">
+        <img id="offline-resources-2x"
+            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+        </template>
+    </div>
+
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+    <script
+        jstcache="0">"use strict";
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+    <script
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