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YouTube 超快聊天

YouTube直播聊天的终极性能提升

目前为 2023-08-22 提交的版本。查看 最新版本。

  1. // ==UserScript==
  2. // @name                YouTube Super Fast Chat
  3. // @version             0.31.1
  4. // @license             MIT
  5. // @name:ja             YouTube スーパーファーストチャット
  6. // @name:zh-TW          YouTube 超快聊天
  7. // @name:zh-CN          YouTube 超快聊天
  8. // @icon                https://github.com/cyfung1031/userscript-supports/raw/main/icons/super-fast-chat.png
  9. // @namespace           UserScript
  10. // @match               https://www.youtube.com/live_chat*
  11. // @match               https://www.youtube.com/live_chat_replay*
  12. // @author              CY Fung
  13. // @run-at              document-start
  14. // @grant               none
  15. // @unwrap
  16. // @allFrames           true
  17. // @inject-into         page
  18. //
  19. // @compatible          firefox Violentmonkey
  20. // @compatible          firefox Tampermonkey
  21. // @compatible          firefox FireMonkey
  22. // @compatible          chrome Violentmonkey
  23. // @compatible          chrome Tampermonkey
  24. // @compatible          opera Violentmonkey
  25. // @compatible          opera Tampermonkey
  26. // @compatible          safari Stay
  27. // @compatible          edge Violentmonkey
  28. // @compatible          edge Tampermonkey
  29. // @compatible          brave Violentmonkey
  30. // @compatible          brave Tampermonkey
  31. //
  32. // @description         Ultimate Performance Boost for YouTube Live Chats
  33. // @description:ja      YouTubeのライブチャットの究極のパフォーマンスブースト
  34. // @description:zh-TW   YouTube直播聊天的終極性能提升
  35. // @description:zh-CN   YouTube直播聊天的终极性能提升
  36. //
  37. // ==/UserScript==
  38.  
  39. ((__CONTEXT__) => {
  40.   'use strict';
  41.  
  42.   const ENABLE_REDUCED_MAXITEMS_FOR_FLUSH = true;         // TRUE to enable trimming down to MAX_ITEMS_FOR_FULL_FLUSH (25) messages when there are too many unrendered messages
  43.   const MAX_ITEMS_FOR_TOTAL_DISPLAY = 90;                 // By default, 250 latest messages will be displayed, but displaying MAX_ITEMS_FOR_TOTAL_DISPLAY (90) messages is already sufficient.
  44.   const MAX_ITEMS_FOR_FULL_FLUSH = 25;                    // If there are too many new (stacked) messages not yet rendered, clean all and flush MAX_ITEMS_FOR_FULL_FLUSH (25) latest messages then incrementally added back to MAX_ITEMS_FOR_TOTAL_DISPLAY (90) messages
  45.  
  46.   const ENABLE_NO_SMOOTH_TRANSFORM = true;                // Depends on whether you want the animation effect for new chat messages
  47.   const USE_OPTIMIZED_ON_SCROLL_ITEMS = true;             // TRUE for the majority
  48.   const USE_WILL_CHANGE_CONTROLLER = false;               // FALSE for the majority
  49.   const ENABLE_DELAYED_CHAT_OCCURRENCE_PREFERRED = true;  // In Chrome, the rendering of new chat messages could be too fast for no smooth transform. 80ms delay of displaying new messages should be sufficient for element rendering.
  50.   const ENABLE_OVERFLOW_ANCHOR_PREFERRED = true;          // Enable `overflow-anchor: auto` to lock the scroll list at the bottom for no smooth transform.
  51.  
  52.   const FIX_SHOW_MORE_BUTTON_LOCATION = true;             // When there are voting options (bottom panel), move the "show more" button to the top.
  53.   const FIX_INPUT_PANEL_OVERFLOW_ISSUE = true;            // When the super chat button is flicking with color, the scrollbar might come out.
  54.   const FIX_INPUT_PANEL_BORDER_ISSUE = true;              // No border should be allowed if there is an empty input panel.
  55.   const SET_CONTAIN_FOR_CHATROOM = true;                  // Rendering hacks (`contain`) for chatroom elements. [ General ]
  56.  
  57.   const FORCE_CONTENT_VISIBILITY_UNSET = true;            // Content-visibility should be always VISIBLE for high performance and great rendering.
  58.   const FORCE_WILL_CHANGE_UNSET = true;                   // Will-change should be always UNSET (auto) for high performance and low energy impact.
  59.  
  60.   // Replace requestAnimationFrame timers with custom implementation
  61.   const ENABLE_RAF_HACK_TICKERS = true;           // When there is a ticker
  62.   const ENABLE_RAF_HACK_DOCKED_MESSAGE = true;    // To be confirmed
  63.   const ENABLE_RAF_HACK_INPUT_RENDERER = true;    // To be confirmed
  64.   const ENABLE_RAF_HACK_EMOJI_PICKER = true;      // When changing the page of the emoji picker
  65.  
  66.   // Force rendering all the character subsets of the designated font(s) before messages come (Pre-Rendering of Text)
  67.   const ENABLE_FONT_PRE_RENDERING_PREFERRED = 1 | 2 | 4 | 8 | 16;
  68.  
  69.   // Backdrop `filter: blur(4px)` inside the iframe can extend to the whole page, causing a negative visual impact on the video you are watching.
  70.   const NO_BACKDROP_FILTER_WHEN_MENU_SHOWN = true;
  71.  
  72.   // Data Manipulation for Participants (Participant List)
  73.   // << if DO_PARTICIPANT_LIST_HACKS >>
  74.   const DO_PARTICIPANT_LIST_HACKS = true;                     // TRUE for the majority
  75.   const SHOW_PARTICIPANT_CHANGES_IN_CONSOLE = false;          // Just too annoying to show them all in popular chat
  76.   const CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = true;  // Only consider changes in renderable content (not concerned with the last chat message of the participants)
  77.   const PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED = true;
  78.   // << end >>
  79.  
  80.   // show more button
  81.   const ENABLE_SHOW_MORE_BLINKER = true;                      // BLINK WHEN NEW MESSAGES COME
  82.  
  83.   // faster stampDomArray_ for participants list creation
  84.   const ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL = 1;            // 0 - OFF; 1 - ON; 2 - ON(PARTICIPANTS_LIST ONLY)
  85.   const USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET = false;
  86.  
  87.   // reuse yt components
  88.   const ENABLE_FLAGS_REUSE_COMPONENTS = true;
  89.  
  90.   // images <Group#I01>
  91.   const AUTHOR_PHOTO_SINGLE_THUMBNAIL = 1;  // 0 - disable; 1- smallest; 2- largest
  92.   const EMOJI_IMAGE_SINGLE_THUMBNAIL = 1;   // 0 - disable; 1- smallest; 2- largest
  93.   const LEAST_IMAGE_SIZE = 48;              // minium size = 48px
  94.  
  95.   const DO_LINK_PREFETCH = true;                      // DO NOT CHANGE
  96.   // << if DO_LINK_PREFETCH >>
  97.   const ENABLE_BASE_PREFETCHING = true;               // (SUB-)DOMAIN | dns-prefetch & preconnect
  98.   const ENABLE_PRELOAD_THUMBNAIL = true;              // subresource (prefetch) [LINK for Images]
  99.   const PREFETCH_LIMITED_SIZE_EMOJI = 512;            // DO NOT CHANGE THIS
  100.   const PREFETCH_LIMITED_SIZE_AUTHOR_PHOTO = 68;      // DO NOT CHANGE THIS
  101.   // << end >>
  102.  
  103.   const FIX_SETSRC_AND_THUMBNAILCHANGE_ = true;       // Function Replacement for yt-img-shadow....
  104.   const FIX_THUMBNAIL_DATACHANGED = true;             // Function Replacement for yt-live-chat-author-badge-renderer..dataChanged
  105.   // const REMOVE_PRELOADAVATARFORADDACTION = false;      // Function Replacement for yt-live-chat-renderer..preloadAvatarForAddAction
  106.  
  107.   const FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION = true;     // important [depends on <Group#I01>]
  108.   const FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT = true;  // [depends on <Group#I01>]
  109.  
  110.   const ATTEMPT_ANIMATED_TICKER_BACKGROUND = 'steps'   // false OR '' for disabled, 'linear', 'steps' for easing-function
  111.   // << if ATTEMPT_ANIMATED_TICKER_BACKGROUND >>
  112.   // BROWSER SUPPORT: Chrome 75+, Edge 79+, Safari 13.1+, Firefox 63+, Opera 62+
  113.   const TICKER_MAX_STEPS_LIMIT = 500;                       //  NOT LESS THAN 5 STEPS!!
  114.   // [limiting 500 max steps] is recommended for "confortable visual change"
  115.   //      min. step increment 0.2% => max steps: 500 =>  800ms per each update
  116.   //      min. step increment 0.5% => max steps: 200 => 1000ms per each update
  117.   //      min. step increment 1.0% => max steps: 100 => 1000ms per each update
  118.   //      min. step increment 2.5% => max steps:  40 => 1000ms per each update
  119.   //      min. step increment 5.0% => max steps:  20 => 1250ms per each update
  120.   const ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX = true;    // for video playback's ticker issue. [ Playback Replay - Pause at Middle - Backwards Seeking ]
  121.   // << end >>
  122.  
  123.   const FIX_TOOLTIP_DISPLAY = true;
  124.   const USE_VANILLA_DEREF = true;
  125.   const FIX_DROPDOWN_DERAF = true;                        // DONT CHANGE
  126.  
  127.   
  128.   const FIX_MENU_REOPEN_RENDER_PERFORMANCE_1 = true;
  129.   const FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK = true;
  130.   // const FIX_MENU_CAPTURE_SCROLL = true;
  131.   const CHAT_MENU_REFIT_ALONG_SCROLLING = 0;        // 0 for locking / default; 1 for unlocking only; 2 for unlocking and refit
  132.  
  133.   const RAF_FIX_keepScrollClamped = true;
  134.   const RAF_FIX_scrollIncrementally = true;
  135.  
  136.   const FIX_MENU_POSITION_N_SIZING_ON_SHOWN = 1;       // correct size and position when the menu dropdown opens
  137.  
  138.   const CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN = true;
  139.  
  140.  
  141.   // ========= EXPLANTION FOR 0.2% @ step timing [min. 0.2%] ===========
  142.   /*
  143.  
  144.     ### Time Approach
  145.  
  146.     // all below values can make the time interval > 250ms
  147.     // 250ms (practical value) refers to the minimum frequency for timeupdate in most browsers (typically, shorter timeupdate interval in modern browsers)
  148.     if (totalDuration > 400000) stepInterval = 0.2;  // 400000ms with 0.2% increment => 800ms
  149.     else if (totalDuration > 200000) stepInterval = 0.5; // 200000ms with 0.5% increment => 1000ms
  150.     else if (totalDuration > 100000) stepInterval = 1; // 100000ms with 1% increment => 1000ms
  151.     else if (totalDuration > 50000) stepInterval = 2; // 50000ms with 2% increment => 1000ms
  152.     else if (totalDuration > 25000) stepInterval = 5; // 25000ms with 5% increment => 1250ms
  153.  
  154.     ### Pixel Check
  155.     // Target Max Pixel Increment < 5px for Short Period Ticker (Rapid Background Change)
  156.     // Assume total width <= 99px for short period ticker, like small donation & member welcome
  157.     99px * 5% = 4.95px < 5px [Condition Fulfilled]
  158.  
  159.     ### Example - totalDuration = 280000
  160.     totalDuration 280000
  161.     stepInterval 0.5
  162.     numOfSteps = Math.round(100 / stepInterval) = 200
  163.     time interval = 280000 / 200 = 1400ms <acceptable>
  164.  
  165.     ### Example - totalDuration = 18000
  166.     totalDuration 18000
  167.     stepInterval 5
  168.     numOfSteps = Math.round(100 / stepInterval) = 20
  169.     time interval = 18000 / 20 = 900ms <acceptable>
  170.  
  171.     ### Example - totalDuration = 5000
  172.     totalDuration 5000
  173.     stepInterval 5
  174.     numOfSteps = Math.round(100 / stepInterval) = 20
  175.     time interval = 5000 / 20 = 250ms <threshold value>
  176.  
  177.     ### Example - totalDuration = 3600
  178.     totalDuration 3600
  179.     stepInterval 5
  180.     numOfSteps = Math.round(100 / stepInterval) = 20
  181.     time interval = 3600 / 20 = 180ms <reasonable for 3600ms ticker>
  182.  
  183.   */
  184.  
  185.   // =======================================================================================================
  186.  
  187.   // AUTOMAICALLY DETERMINED
  188.   const ENABLE_FLAGS_MAINTAIN_STABLE_LIST = ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL === 1;
  189.   const ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST = ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL >= 1;
  190.   const CHAT_MENU_SCROLL_UNLOCKING = CHAT_MENU_REFIT_ALONG_SCROLLING >= 1;
  191.   let runTickerClassName = 'run-ticker';
  192.  
  193.   const dummyImgURL = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
  194.   /*
  195.     WebP: data:image/webp;base64,UklGRjAB
  196.     PNG: data:image/png;base64,iVBORw0KGg==
  197.     JPEG: data:image/jpeg;base64,/9j/4AA=
  198.     GIF: data:image/gif;base64,R0lGODlhAQABAIA=
  199.     BMP: data:image/bmp;base64,Qk1oAAAA
  200.     SVG: data:image/svg+xml;base64,PHN2Zy8+Cg==
  201.  
  202.     WebP: data:image/webp;base64,AAAAAAA=
  203.     PNG:  data:image/png;base64,AAAAAAA=
  204.     JPEG: data:image/jpeg;base64,AAAAAAA=
  205.     GIF:  data:image/gif;base64,AAAAAAA=
  206.     BMP:  data:image/bmp;base64,AAAAAAA=
  207.  
  208.     data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
  209.  
  210.  
  211.   */
  212.  
  213.   // image sizing code
  214.   // (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null)
  215.  
  216.  
  217.   //   function KC(a, b, c, d) {
  218.   //     d = void 0 === d ? "width" : d;
  219.   //     if (!a || !a.length)
  220.   //         return null;
  221.   //     if (z("kevlar_tuner_should_always_use_device_pixel_ratio")) {
  222.   //         var e = window.devicePixelRatio;
  223.   //         z("kevlar_tuner_should_clamp_device_pixel_ratio") ? e = Math.min(e, zl("kevlar_tuner_clamp_device_pixel_ratio")) : z("kevlar_tuner_should_use_thumbnail_factor") && (e = zl("kevlar_tuner_thumbnail_factor"));
  224.   //         HC = e
  225.   //     } else
  226.   //         HC || (HC = window.devicePixelRatio);
  227.   //     e = HC;
  228.   //     z("kevlar_tuner_should_always_use_device_pixel_ratio") ? b *= e : 1 < e && (b *= e);
  229.   //     if (z("kevlar_tuner_min_thumbnail_quality"))
  230.   //         return a[0].url || null;
  231.   //     e = a.length;
  232.   //     if (z("kevlar_tuner_max_thumbnail_quality"))
  233.   //         return a[e - 1].url || null;
  234.   //     if (c)
  235.   //         for (var h = 0; h < e; h++)
  236.   //             if (0 <= a[h].url.indexOf(c))
  237.   //                 return a[h].url || null;
  238.   //     for (c = 0; c < e; c++)
  239.   //         if (a[c][d] >= b)
  240.   //             return a[c].url || null;
  241.   //     for (b = e - 1; 0 < b; b--)
  242.   //         if (a[b][d])
  243.   //             return a[b].url || null;
  244.   //     return a[0].url || null
  245.   // }
  246.  
  247.   const { IntersectionObserver } = __CONTEXT__;
  248.  
  249.   /** @type {globalThis.PromiseConstructor} */
  250.   const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  251.  
  252.   if (!IntersectionObserver) return console.warn("Your browser does not support IntersectionObserver.\nPlease upgrade to the latest version.");
  253.   if (typeof WebAssembly !== 'object') return console.warn("Your browser is too old.\nPlease upgrade to the latest version."); // for passive and once
  254.  
  255.   // necessity of cssText3_smooth_transform_position to be checked.
  256.   const cssText3_smooth_transform_position = ENABLE_NO_SMOOTH_TRANSFORM ? `
  257.  
  258.     #item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer {
  259.         position: static !important;
  260.     }
  261.  
  262.   `: '';
  263.  
  264.   // fallback if dummy style fn fails
  265.   const cssText4_smooth_transform_forced_props = ENABLE_NO_SMOOTH_TRANSFORM ? `
  266.  
  267.     /* optional */
  268.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  269.         height: auto !important;
  270.         min-height: unset !important;
  271.     }
  272.  
  273.     #items.style-scope.yt-live-chat-item-list-renderer {
  274.         transform: translateY(0px) !important;
  275.     }
  276.  
  277.     /* optional */
  278.  
  279.   `: '';
  280.  
  281.   const cssText5 = SET_CONTAIN_FOR_CHATROOM ? `
  282.  
  283.     /* ------------------------------------------------------------------------------------------------------------- */
  284.  
  285.     yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer #image, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer #image img {
  286.         contain: layout style;
  287.     }
  288.  
  289.     #items.style-scope.yt-live-chat-item-list-renderer {
  290.         contain: layout paint style;
  291.     }
  292.  
  293.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  294.         contain: style;
  295.     }
  296.  
  297.     #item-scroller.style-scope.yt-live-chat-item-list-renderer {
  298.         contain: size style;
  299.     }
  300.  
  301.     #contents.style-scope.yt-live-chat-item-list-renderer, #chat.style-scope.yt-live-chat-renderer, img.style-scope.yt-img-shadow[width][height] {
  302.         contain: size layout paint style;
  303.     }
  304.  
  305.     .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label], .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label] > #container {
  306.         contain: layout paint style;
  307.     }
  308.  
  309.     yt-live-chat-text-message-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-membership-item-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-paid-message-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-banner-manager.style-scope.yt-live-chat-item-list-renderer {
  310.         contain: layout style;
  311.     }
  312.  
  313.     tp-yt-paper-tooltip[style*="inset"][role="tooltip"] {
  314.         contain: layout paint style;
  315.     }
  316.  
  317.     /* ------------------------------------------------------------------------------------------------------------- */
  318.  
  319.   ` : '';
  320.  
  321.   const cssText6b_show_more_button = FIX_SHOW_MORE_BUTTON_LOCATION ? `
  322.  
  323.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer{
  324.         top: 4px;
  325.         transition-property: top;
  326.         bottom: unset;
  327.     }
  328.  
  329.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer[disabled]{
  330.         top: -42px;
  331.     }
  332.  
  333.   `: '';
  334.  
  335.   const cssText6c_input_panel_overflow = FIX_INPUT_PANEL_OVERFLOW_ISSUE ? `
  336.  
  337.     #input-panel #picker-buttons yt-live-chat-icon-toggle-button-renderer#product-picker {
  338.         contain: layout style;
  339.     }
  340.  
  341.     #chat.yt-live-chat-renderer ~ #panel-pages.yt-live-chat-renderer {
  342.         overflow: visible;
  343.     }
  344.  
  345.   `: '';
  346.  
  347.   const cssText6d_input_panel_border = FIX_INPUT_PANEL_BORDER_ISSUE ? `
  348.  
  349.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer:not(:empty) {
  350.         --yt-live-chat-action-panel-top-border: none;
  351.     }
  352.  
  353.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer.iron-selected > *:first-child {
  354.         border-top: 1px solid var(--yt-live-chat-panel-pages-border-color);
  355.     }
  356.  
  357.     html #panel-pages.yt-live-chat-renderer {
  358.         border-top: 0;
  359.         border-bottom: 0;
  360.     }
  361.  
  362.   `: '';
  363.  
  364.   const cssText7b_content_visibility_unset = FORCE_CONTENT_VISIBILITY_UNSET ? `
  365.  
  366.     img,
  367.     yt-img-shadow[height][width],
  368.     yt-img-shadow {
  369.         content-visibility: visible !important;
  370.     }
  371.  
  372.   `  : '';
  373.  
  374.   const cssText7c_will_change_unset = FORCE_WILL_CHANGE_UNSET ? `
  375.  
  376.     /* remove YouTube constant will-change */
  377.     /* constant value will slow down the performance; default auto */
  378.  
  379.     /* www-player.css */
  380.     html .ytp-contextmenu,
  381.     html .ytp-settings-menu {
  382.         will-change: unset;
  383.     }
  384.  
  385.     /* frequently matched elements */
  386.     html .fill.yt-interaction,
  387.     html .stroke.yt-interaction,
  388.     html .yt-spec-touch-feedback-shape__fill,
  389.     html .yt-spec-touch-feedback-shape__stroke {
  390.         will-change: unset;
  391.     }
  392.  
  393.     /* live_chat_polymer.js */
  394.     /*
  395.     html .toggle-button.tp-yt-paper-toggle-button,
  396.     html #primaryProgress.tp-yt-paper-progress,
  397.     html #secondaryProgress.tp-yt-paper-progress,
  398.     html #onRadio.tp-yt-paper-radio-button,
  399.     html .fill.yt-interaction,
  400.     html .stroke.yt-interaction,
  401.     html .yt-spec-touch-feedback-shape__fill,
  402.     html .yt-spec-touch-feedback-shape__stroke {
  403.         will-change: unset;
  404.     }
  405.     */
  406.  
  407.     /* desktop_polymer_enable_wil_icons.js */
  408.     /* html .fill.yt-interaction,
  409.     html .stroke.yt-interaction, */
  410.     html tp-yt-app-header::before,
  411.     html tp-yt-iron-list,
  412.     html #items.tp-yt-iron-list > *,
  413.     html #onRadio.tp-yt-paper-radio-button,
  414.     html .toggle-button.tp-yt-paper-toggle-button,
  415.     html ytd-thumbnail-overlay-toggle-button-renderer[use-expandable-tooltip] #label.ytd-thumbnail-overlay-toggle-button-renderer,
  416.     html #items.ytd-post-multi-image-renderer,
  417.     html #items.ytd-horizontal-card-list-renderer,
  418.     html #items.yt-horizontal-list-renderer,
  419.     html #left-arrow.yt-horizontal-list-renderer,
  420.     html #right-arrow.yt-horizontal-list-renderer,
  421.     html #items.ytd-video-description-infocards-section-renderer,
  422.     html #items.ytd-video-description-music-section-renderer,
  423.     html #chips.ytd-feed-filter-chip-bar-renderer,
  424.     html #chips.yt-chip-cloud-renderer,
  425.     html #items.ytd-merch-shelf-renderer,
  426.     html #items.ytd-product-details-image-carousel-renderer,
  427.     html ytd-video-preview,
  428.     html #player-container.ytd-video-preview,
  429.     html #primaryProgress.tp-yt-paper-progress,
  430.     html #secondaryProgress.tp-yt-paper-progress,
  431.     html ytd-miniplayer[enabled] /* ,
  432.     html .yt-spec-touch-feedback-shape__fill,
  433.     html .yt-spec-touch-feedback-shape__stroke */ {
  434.         will-change: unset;
  435.     }
  436.  
  437.     /* other */
  438.     .ytp-videowall-still-info-content[class],
  439.     .ytp-suggestion-image[class] {
  440.         will-change: unset !important;
  441.     }
  442.  
  443.   ` : '';
  444.  
  445.   const ENABLE_FONT_PRE_RENDERING = typeof HTMLElement.prototype.append === 'function' ? (ENABLE_FONT_PRE_RENDERING_PREFERRED || 0) : 0;
  446.   const cssText8_fonts_pre_render = ENABLE_FONT_PRE_RENDERING ? `
  447.  
  448.     elzm-fonts {
  449.         visibility: collapse;
  450.         position: fixed;
  451.         top: -10px;
  452.         left: -10px;
  453.         font-size: 10pt;
  454.         line-height: 100%;
  455.         width: 100px;
  456.         height: 100px;
  457.         transform: scale(0.1);
  458.         transform: scale(0.01);
  459.         transform: scale(0.001);
  460.         transform-origin: 0 0;
  461.         contain: strict;
  462.         display: block;
  463.  
  464.         pointer-events: none !important;
  465.         user-select: none !important;
  466.     }
  467.  
  468.     elzm-fonts[id]#elzm-fonts-yk75g {
  469.         user-select: none !important;
  470.         pointer-events: none !important;
  471.     }
  472.  
  473.     elzm-font {
  474.         visibility: collapse;
  475.         position: absolute;
  476.         line-height: 100%;
  477.         width: 100px;
  478.         height: 100px;
  479.         contain: strict;
  480.         display: block;
  481.  
  482.         user-select: none !important;
  483.         pointer-events: none !important;
  484.     }
  485.  
  486.     elzm-font::before {
  487.         visibility: collapse;
  488.         position: absolute;
  489.         line-height: 100%;
  490.         width: 100px;
  491.         height: 100px;
  492.         contain: strict;
  493.         display: block;
  494.  
  495.         content: '0aZ!@#$~^&*()_-+[]{}|;:><?\\0460\\0301\\0900\\1F00\\0370\\0102\\0100\\28EB2\\28189\\26DA0\\25A9C\\249BB\\23F61\\22E8B\\21927\\21076\\2048E\\1F6F5\\FF37\\F94F\\F0B2\\9F27\\9D9A\\9BEA\\9A6B\\98EC\\9798\\9602\\949D\\9370\\926B\\913A\\8FA9\\8E39\\8CC1\\8B26\\8983\\8804\\8696\\8511\\83BC\\828D\\8115\\7F9A\\7E5B\\7D07\\7B91\\7A2C\\78D2\\776C\\7601\\74AA\\73B9\\7265\\70FE\\6FBC\\6E88\\6D64\\6C3F\\6A9C\\6957\\67FE\\66B3\\6535\\63F2\\628E\\612F\\5FE7\\5E6C\\5CEE\\5B6D\\5A33\\58BC\\575B\\5611\\54BF\\536E\\51D0\\505D\\4F22\\4AD1\\41DB\\3B95\\3572\\2F3F\\26FD\\25A1\\2477\\208D\\1D0A\\1FB\\A1\\A3\\B4\\2CB\\60\\10C\\E22\\A5\\4E08\\B0\\627\\2500\\5E\\201C\\3C\\B7\\23\\26\\3E\\D\\20\\25EE8\\1F235\\FFD7\\FA10\\F92D\\9E8B\\9C3E\\9AE5\\98EB\\971D\\944A\\92BC\\9143\\8F52\\8DC0\\8B2D\\8973\\87E2\\8655\\84B4\\82E8\\814A\\7F77\\7D57\\7BC8\\7A17\\7851\\768C\\7511\\736C\\7166\\6F58\\6D7C\\6B85\\69DD\\6855\\667E\\64D2\\62CF\\6117\\5F6C\\5D9B\\5BBC\\598B\\57B3\\5616\\543F\\528D\\50DD\\4F57\\4093\\3395\\32B5\\31C8\\3028\\2F14\\25E4\\24D1\\2105\\2227\\A8\\2D9\\2CA\\2467\\B1\\2020\\2466\\251C\\266B\\AF\\4E91\\221E\\2464\\2266\\2207\\4E32\\25B3\\2463\\2010\\2103\\3014\\25C7\\24\\25BD\\4E18\\2460\\21D2\\2015\\2193\\4E03\\7E\\25CB\\2191\\25BC\\3D\\500D\\4E01\\25\\30F6\\2605\\266A\\40\\2B\\4E16\\7C\\A9\\4E\\21\\1F1E9\\FEE3\\F0A7\\9F3D\\9DFA\\9C3B\\9A5F\\98C8\\972A\\95B9\\94E7\\9410\\92B7\\914C\\8FE2\\8E2D\\8CAF\\8B5E\\8A02\\8869\\86E4\\8532\\83B4\\82A9\\814D\\7FFA\\7ED7\\7DC4\\7CCC\\7BC3\\7ACA\\797C\\783E\\770F\\760A\\74EF\\73E7\\72DD\\719C\\7005\\6ED8\\6DC3\\6CB2\\6A01\\68E1\\6792\\663A\\64F8\\63BC\\623B\\60FA\\5FD1\\5EA3\\5D32\\5BF5\\5AB2\\5981\\5831\\570A\\5605\\5519\\53FB\\52A2\\5110\\4FE3\\4EB8\\3127\\279C\\2650\\254B\\23E9\\207B\\1D34\\2AE\\176\\221A\\161\\200B\\300C\\4E4C\\1F921\\FF78\\FA0A\\F78A\\9EB9\\9D34\\9BD3\\9A6F\\9912\\97C6\\964E\\950C\\93E4\\92E5\\91F0\\90BB\\8F68\\8E18\\8B6C\\89F6\\889B\\874C\\8602\\84B1\\8378\\826E\\8113\\7FB1\\7EAF\\7D89\\7C20\\7AFB\\7988\\7840\\7705\\75CC\\749A\\73B3\\727F\\7113\\6FE8\\6ED6\\6DD3\\6CDA\\6BBB\\6A31\\6900\\67D9\\66A7\\655D\\6427\\630D\\61C6\\60AC\\5F78\\5E34\\5CE0\\5B80\\5A51\\590B\\57A1\\566F\\5551\\543D\\52DB\\518F\\5032\\3A17\\305C\\2749\\264A\\2567\\2476\\2139\\1EC0\\11AF\\2C8\\1AF\\E17\\2190\\2022\\2502\\2312\\2025\\50';
  496.  
  497.         user-select: none !important;
  498.         pointer-events: none !important;
  499.     }
  500.  
  501.   `: '';
  502.  
  503.   const cssText9_no_backdrop_filter_when_menu_shown = NO_BACKDROP_FILTER_WHEN_MENU_SHOWN ? `
  504.     tp-yt-iron-dropdown.yt-live-chat-app ytd-menu-popup-renderer  {
  505.         -webkit-backdrop-filter: none;
  506.         backdrop-filter: none;
  507.     }
  508.   `: '';
  509.  
  510.   const cssText10_show_more_blinker = ENABLE_SHOW_MORE_BLINKER ? `
  511.  
  512.     @keyframes blinker-miuzp {
  513.         0%, 60%, 100% {
  514.             opacity: 1;
  515.         }
  516.         30% {
  517.             opacity: 0.6;
  518.         }
  519.     }
  520.  
  521.     yt-icon-button#show-more.has-new-messages-miuzp {
  522.         animation: blinker-miuzp 1.74s linear infinite;
  523.     }
  524.  
  525.   `: '';
  526.  
  527.  
  528.   const addCss = () => `
  529.  
  530.   @property --ticker-rtime {
  531.     syntax: "<percentage>";
  532.     inherits: false;
  533.     initial-value: 0%;
  534.   }
  535.  
  536.   /*
  537.   .run-ticker {
  538.     background:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2));
  539.   }
  540.  
  541.   .run-ticker-test {
  542.     background: #00000001;
  543.   }
  544.  
  545.   .run-ticker-forced,
  546.   yt-live-chat-ticker-renderer #items > * > #container.run-ticker-forced,
  547.   yt-live-chat-ticker-renderer[class] #items[class] > *[class] > #container.run-ticker-forced[class]
  548.   {
  549.     background:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2)) !important;
  550.   }
  551.   */
  552.  
  553.   .run-ticker {
  554.     --ticker-bg:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2));
  555.   }
  556.  
  557.   .run-ticker,
  558.   yt-live-chat-ticker-renderer #items > * > #container.run-ticker,
  559.   yt-live-chat-ticker-renderer[class] #items[class] > *[class] > #container.run-ticker[class]
  560.   {
  561.     background: var(--ticker-bg) !important;
  562.   }
  563.  
  564.   yt-live-chat-ticker-dummy777-item-renderer {
  565.     background: #00000001;
  566.   }
  567.  
  568.   yt-live-chat-ticker-dummy777-item-renderer[dummy777] {
  569.     position: fixed !important;
  570.     top: -1000px !important;
  571.     left: -1000px !important;
  572.     font-size: 1px !important;
  573.     color: transparent !important;
  574.     pointer-events: none !important;
  575.     z-index: -1 !important;
  576.     contain: strict !important;
  577.     box-sizing: border-box !important;
  578.     pointer-events: none !important;
  579.     user-select: none !important;
  580.     max-width: 1px !important;
  581.     max-height: 1px !important;
  582.     overflow: hidden !important;
  583.     visibility: collapse !important;
  584.     display: none !important;
  585.   }
  586.  
  587.   yt-live-chat-ticker-dummy777-item-renderer #container {
  588.     background: inherit;
  589.   }
  590.  
  591.  
  592.   ${cssText8_fonts_pre_render}
  593.  
  594.   ${cssText9_no_backdrop_filter_when_menu_shown}
  595.  
  596.   @supports (contain: layout paint style) {
  597.  
  598.     ${cssText5}
  599.  
  600.   }
  601.  
  602.   @supports (color: var(--general)) {
  603.  
  604.     html {
  605.         --yt-live-chat-item-list-renderer-padding: 0px 0px;
  606.     }
  607.  
  608.     ${cssText3_smooth_transform_position}
  609.  
  610.     ${cssText7c_will_change_unset}
  611.  
  612.     ${cssText7b_content_visibility_unset}
  613.  
  614.     yt-live-chat-item-list-renderer:not([allow-scroll]) #item-scroller.yt-live-chat-item-list-renderer {
  615.         overflow-y: scroll;
  616.         padding-right: 0;
  617.     }
  618.  
  619.     ${cssText4_smooth_transform_forced_props}
  620.  
  621.     yt-icon[icon="down_arrow"] > *, yt-icon-button#show-more > * {
  622.         pointer-events: none !important;
  623.     }
  624.  
  625.     #continuations, #continuations * {
  626.         contain: strict;
  627.         position: fixed;
  628.         top: 2px;
  629.         height: 1px;
  630.         width: 2px;
  631.         height: 1px;
  632.         visibility: collapse;
  633.     }
  634.  
  635.     ${cssText6b_show_more_button}
  636.  
  637.     ${cssText6d_input_panel_border}
  638.  
  639.     ${cssText6c_input_panel_overflow}
  640.  
  641.   }
  642.  
  643.  
  644.   @supports (overflow-anchor: auto) {
  645.  
  646.     .no-anchor * {
  647.         overflow-anchor: none;
  648.     }
  649.     .no-anchor > item-anchor {
  650.         overflow-anchor: auto;
  651.     }
  652.  
  653.     item-anchor {
  654.  
  655.         height:1px;
  656.         width: 100%;
  657.         transform: scaleY(0.00001);
  658.         transform-origin:0 0;
  659.         contain: strict;
  660.         opacity:0;
  661.         display:flex;
  662.         position:relative;
  663.         flex-shrink:0;
  664.         flex-grow:0;
  665.         margin-bottom:0;
  666.         overflow:hidden;
  667.         box-sizing:border-box;
  668.         visibility: visible;
  669.         content-visibility: visible;
  670.         contain-intrinsic-size: auto 1px;
  671.         pointer-events:none !important;
  672.  
  673.     }
  674.  
  675.     #item-scroller.style-scope.yt-live-chat-item-list-renderer[class] {
  676.         overflow-anchor: initial !important; /* whenever ENABLE_OVERFLOW_ANCHOR or not */
  677.     }
  678.  
  679.     html item-anchor {
  680.  
  681.         height: 1px;
  682.         width: 1px;
  683.         top: auto;
  684.         left: auto;
  685.         right: auto;
  686.         bottom: auto;
  687.         transform: translateY(-1px);
  688.         position: absolute;
  689.         z-index: -1;
  690.  
  691.     }
  692.  
  693.   }
  694.  
  695.   @supports (color: var(--pre-rendering)) {
  696.  
  697.     @keyframes dontRenderAnimation {
  698.         0% {
  699.             background-position-x: 3px;
  700.         }
  701.         100% {
  702.             background-position-x: 4px;
  703.         }
  704.     }
  705.  
  706.     .dont-render[class] {
  707.         /* visibility: collapse !important; */
  708.         /* visibility: collapse will make innerText become "" which conflicts with BetterStreamChat; see https://greasyfork.org/scripts/469878/discussions/197267 */
  709.  
  710.         transform: scale(0.01) !important;
  711.         transform: scale(0.00001) !important;
  712.         transform: scale(0.0000001) !important;
  713.         transform-origin: 0 0 !important;
  714.         z-index: -1 !important;
  715.         contain: strict !important;
  716.         box-sizing: border-box !important;
  717.  
  718.         height: 1px !important;
  719.         height: 0.1px !important;
  720.         height: 0.01px !important;
  721.         height: 0.0001px !important;
  722.         height: 0.000001px !important;
  723.  
  724.         animation: dontRenderAnimation 1ms linear 80ms 1 normal forwards !important;
  725.  
  726.         pointer-events: none !important;
  727.         user-select: none !important;
  728.  
  729.     }
  730.  
  731.     #sk35z {
  732.       display: block !important;
  733.  
  734.       visibility: collapse !important;
  735.  
  736.       transform: scale(0.01) !important;
  737.       transform: scale(0.00001) !important;
  738.       transform: scale(0.0000001) !important;
  739.       transform-origin: 0 0 !important;
  740.       z-index: -1 !important;
  741.       contain: strict !important;
  742.       box-sizing: border-box !important;
  743.  
  744.       height: 1px !important;
  745.       height: 0.1px !important;
  746.       height: 0.01px !important;
  747.       height: 0.0001px !important;
  748.       height: 0.000001px !important;
  749.  
  750.       position: absolute !important;
  751.       top: -1000px !important;
  752.       left: -1000px !important;
  753.  
  754.     }
  755.  
  756.   }
  757.  
  758.   [rNgzQ] {
  759.     opacity: 0.1 !important;
  760.     opacity: 0.01 !important;
  761.     opacity: 0.001 !important;
  762.     opacity: 0.0001 !important;
  763.     opacity: 0.00001 !important;
  764.     opacity: 0.00000001 !important;
  765.  
  766.     pointer-events: none !important;
  767.   }
  768.  
  769.   ${cssText10_show_more_blinker}
  770.  
  771.   `;
  772.  
  773.  
  774.   const win = typeof unsafeWindow !== 'undefined' ? unsafeWindow : (this instanceof Window ? this : window);
  775.  
  776.   // Create a unique key for the script and check if it is already running
  777.   const hkey_script = 'mchbwnoasqph';
  778.   if (win[hkey_script]) throw new Error('Duplicated Userscript Calling'); // avoid duplicated scripting
  779.   win[hkey_script] = true;
  780.  
  781.   if (!!ATTEMPT_ANIMATED_TICKER_BACKGROUND) {
  782.  
  783.     let te4 = setTimeout(() => { }); // dummy; skip timerId only;
  784.     if (te4 < 3) {
  785.       setTimeout(() => { });
  786.       setTimeout(() => { });
  787.     }
  788.  
  789.   }
  790.  
  791.   class Mutex {
  792.  
  793.     constructor() {
  794.       this.p = Promise.resolve()
  795.     }
  796.  
  797.     /**
  798.      *  @param {(lockResolve: () => void)} f
  799.      */
  800.     lockWith(f) {
  801.       this.p = this.p.then(() => new Promise(f).catch(console.warn))
  802.     }
  803.  
  804.   }
  805.  
  806.   function dr(s) {
  807.     // reserved for future use
  808.     return s;
  809.     // return window.deWeakJS ? window.deWeakJS(s) : s;
  810.   }
  811.  
  812.   const getProto = (element) => {
  813.     if (element) {
  814.       const cnt = element.inst || element;
  815.       return cnt.constructor.prototype || null;
  816.     }
  817.     return null;
  818.   }
  819.  
  820.   const assertor = (f) => f() || console.assert(false, f + "");
  821.  
  822.   const fnIntegrity = (f, d) => {
  823.     if (!f || typeof f !== 'function') {
  824.       console.warn('f is not a function', f);
  825.       return;
  826.     }
  827.     let p = f + "", s = 0, j = -1, w = 0;
  828.     for (let i = 0, l = p.length; i < l; i++) {
  829.       const t = p[i];
  830.       if (((t >= 'a' && t <= 'z') || (t >= 'A' && t <= 'Z'))) {
  831.         if (j < i - 1) w++;
  832.         j = i;
  833.       } else {
  834.         s++;
  835.       }
  836.     }
  837.     let itz = `${f.length}.${s}.${w}`;
  838.     if (!d) {
  839.       return itz;
  840.     } else {
  841.       return itz === d;
  842.     }
  843.   }
  844.  
  845.  
  846.   console.assert(MAX_ITEMS_FOR_TOTAL_DISPLAY > 0 && MAX_ITEMS_FOR_FULL_FLUSH > 0 && MAX_ITEMS_FOR_TOTAL_DISPLAY > MAX_ITEMS_FOR_FULL_FLUSH)
  847.  
  848.   let ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE = false;
  849.   const isContainSupport = CSS.supports('contain', 'layout paint style');
  850.   if (!isContainSupport) {
  851.     console.warn("Your browser does not support css property 'contain'.\nPlease upgrade to the latest version.".trim());
  852.   } else {
  853.     ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE = true;
  854.   }
  855.  
  856.   let ENABLE_OVERFLOW_ANCHOR_CAPABLE = false;
  857.   const isOverflowAnchorSupport = CSS.supports('overflow-anchor', 'auto');
  858.   if (!isOverflowAnchorSupport) {
  859.     console.warn("Your browser does not support css property 'overflow-anchor'.\nPlease upgrade to the latest version.".trim());
  860.   } else {
  861.     ENABLE_OVERFLOW_ANCHOR_CAPABLE = true;
  862.   }
  863.  
  864.   const NOT_FIREFOX = !CSS.supports('-moz-appearance', 'none'); // 1. Firefox does not have the flicking issue; 2. Firefox's OVERFLOW_ANCHOR is less effective than Chromium's.
  865.  
  866.   const ENABLE_OVERFLOW_ANCHOR = ENABLE_OVERFLOW_ANCHOR_PREFERRED && ENABLE_OVERFLOW_ANCHOR_CAPABLE && ENABLE_NO_SMOOTH_TRANSFORM;
  867.   const ENABLE_DELAYED_CHAT_OCCURRENCE = ENABLE_DELAYED_CHAT_OCCURRENCE_PREFERRED && ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE && ENABLE_OVERFLOW_ANCHOR && ENABLE_NO_SMOOTH_TRANSFORM && NOT_FIREFOX;
  868.  
  869.   let hasTimerModified = null;
  870.   const DO_CHECK_TICKER_BACKGROUND_OVERRIDED = !!ATTEMPT_ANIMATED_TICKER_BACKGROUND || ENABLE_RAF_HACK_TICKERS;
  871.  
  872.   const fxOperator = (proto, propertyName) => {
  873.     let propertyDescriptorGetter = null;
  874.     try {
  875.       propertyDescriptorGetter = Object.getOwnPropertyDescriptor(proto, propertyName).get;
  876.     } catch (e) { }
  877.     return typeof propertyDescriptorGetter === 'function' ? (e) => {
  878.       try {
  879.  
  880.         return propertyDescriptorGetter.call(dr(e));
  881.       } catch (e) { }
  882.       return e[propertyName];
  883.     } : (e) => e[propertyName];
  884.   };
  885.  
  886.   const nodeParent = fxOperator(Node.prototype, 'parentNode');
  887.   // const nFirstElem = fxOperator(HTMLElement.prototype, 'firstElementChild');
  888.   const nPrevElem = fxOperator(HTMLElement.prototype, 'previousElementSibling');
  889.   const nNextElem = fxOperator(HTMLElement.prototype, 'nextElementSibling');
  890.   const nLastElem = fxOperator(HTMLElement.prototype, 'lastElementChild');
  891.  
  892.   const groupCollapsed = (text1, text2) => {
  893.  
  894.     console.groupCollapsed(`%c${text1}%c${text2}`,
  895.       "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;",
  896.       "background-color: #010502; color: #6ad9fe; font-weight: 300; padding: 2px;"
  897.     );
  898.   }
  899.  
  900.  
  901.   const EVENT_KEY_ON_REGISTRY_READY = "ytI-ce-registry-created";
  902.   const onRegistryReady = (callback) => {
  903.     if (typeof customElements === 'undefined') {
  904.       if (!('__CE_registry' in document)) {
  905.         // https://github.com/webcomponents/polyfills/
  906.         Object.defineProperty(document, '__CE_registry', {
  907.           get() {
  908.             // return undefined
  909.           },
  910.           set(nv) {
  911.             if (typeof nv == 'object') {
  912.               delete this.__CE_registry;
  913.               this.__CE_registry = nv;
  914.               this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
  915.             }
  916.             return true;
  917.           },
  918.           enumerable: false,
  919.           configurable: true
  920.         })
  921.       }
  922.       let eventHandler = (evt) => {
  923.         document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  924.         const f = callback;
  925.         callback = null;
  926.         eventHandler = null;
  927.         f();
  928.       };
  929.       document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  930.     } else {
  931.       callback();
  932.     }
  933.   };
  934.  
  935.   const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  936.  
  937.   const renderReadyPn = typeof ResizeObserver !== 'undefined' ? (sizingTarget) => {
  938.  
  939.     return new Promise(resolve => {
  940.  
  941.       let ro = new ResizeObserver(entries => {
  942.         if (entries && entries.length >= 1) {
  943.           resolve();
  944.           ro.disconnect();
  945.           ro = null;
  946.         }
  947.       });
  948.       ro.observe(sizingTarget);
  949.  
  950.  
  951.  
  952.     });
  953.  
  954.   } : (sizingTarget) => {
  955.  
  956.  
  957.     return new Promise(resolve => {
  958.  
  959.       let io = new IntersectionObserver(entries => {
  960.         if (entries && entries.length >= 1) {
  961.           resolve();
  962.           io.disconnect();
  963.           io = null;
  964.         }
  965.       });
  966.       io.observe(sizingTarget);
  967.  
  968.  
  969.  
  970.     });
  971.  
  972.   };
  973.  
  974.   /* globals WeakRef:false */
  975.  
  976.   /** @type {(o: Object | null) => WeakRef | null} */
  977.   const mWeakRef = typeof WeakRef === 'function' ? (o => o ? new WeakRef(o) : null) : (o => o || null);
  978.  
  979.   /** @type {(wr: Object | null) => Object | null} */
  980.   const kRef = (wr => (wr && wr.deref) ? wr.deref() : wr);
  981.  
  982.   const { addCssManaged } = (() => {
  983.  
  984.     const addFontPreRendering = () => {
  985.  
  986.       groupCollapsed("YouTube Super Fast Chat", " | Fonts Pre-Rendering");
  987.  
  988.       let efsContainer = document.createElement('elzm-fonts');
  989.       efsContainer.id = 'elzm-fonts-yk75g'
  990.  
  991.       const arr = [];
  992.       let p = document.createElement('elzm-font');
  993.       arr.push(p);
  994.  
  995.       if (ENABLE_FONT_PRE_RENDERING & 1) {
  996.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  997.  
  998.           p = document.createElement('elzm-font');
  999.           p.style.fontWeight = size;
  1000.           arr.push(p);
  1001.         }
  1002.       }
  1003.  
  1004.       if (ENABLE_FONT_PRE_RENDERING & 2) {
  1005.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  1006.  
  1007.           p = document.createElement('elzm-font');
  1008.           p.style.fontFamily = 'Roboto';
  1009.           p.style.fontWeight = size;
  1010.           arr.push(p);
  1011.         }
  1012.       }
  1013.  
  1014.       if (ENABLE_FONT_PRE_RENDERING & 4) {
  1015.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  1016.  
  1017.           p = document.createElement('elzm-font');
  1018.           p.style.fontFamily = '"YouTube Noto",Roboto,Arial,Helvetica,sans-serif';
  1019.           p.style.fontWeight = size;
  1020.           arr.push(p);
  1021.         }
  1022.       }
  1023.  
  1024.  
  1025.       if (ENABLE_FONT_PRE_RENDERING & 8) {
  1026.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  1027.  
  1028.           p = document.createElement('elzm-font');
  1029.           p.style.fontFamily = '"Noto",Roboto,Arial,Helvetica,sans-serif';
  1030.           p.style.fontWeight = size;
  1031.           arr.push(p);
  1032.         }
  1033.       }
  1034.  
  1035.  
  1036.       if (ENABLE_FONT_PRE_RENDERING & 16) {
  1037.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  1038.  
  1039.           p = document.createElement('elzm-font');
  1040.           p.style.fontFamily = 'sans-serif';
  1041.           p.style.fontWeight = size;
  1042.           arr.push(p);
  1043.         }
  1044.       }
  1045.  
  1046.       console.log('number of elzm-font elements', arr.length);
  1047.  
  1048.       HTMLElement.prototype.append.apply(efsContainer, arr);
  1049.  
  1050.       (document.body || document.documentElement).appendChild(efsContainer);
  1051.  
  1052.  
  1053.       console.log('elzm-font elements have been added to the page for rendering.');
  1054.  
  1055.       console.groupEnd();
  1056.  
  1057.     }
  1058.  
  1059.     let isCssAdded = false;
  1060.  
  1061.     function addCssElement() {
  1062.       let s = document.createElement('style');
  1063.       s.id = 'ewRvC';
  1064.       return s;
  1065.     }
  1066.  
  1067.     const addCssManaged = () => {
  1068.       if (!isCssAdded && document.documentElement && document.head) {
  1069.         isCssAdded = true;
  1070.         document.head.appendChild(dr(addCssElement())).textContent = addCss();
  1071.         if (ENABLE_FONT_PRE_RENDERING) {
  1072.           Promise.resolve().then(addFontPreRendering)
  1073.         }
  1074.       }
  1075.     }
  1076.  
  1077.     return { addCssManaged };
  1078.   })();
  1079.  
  1080.  
  1081.   const { setupStyle } = (() => {
  1082.  
  1083.     const sp7 = Symbol();
  1084.  
  1085.     const proxyHelperFn = (dummy) => ({
  1086.  
  1087.       get(target, prop) {
  1088.         return (prop in dummy) ? dummy[prop] : prop === sp7 ? target : target[prop];
  1089.       },
  1090.       set(target, prop, value) {
  1091.         if (!(prop in dummy)) {
  1092.           target[prop] = value;
  1093.         }
  1094.         return true;
  1095.       },
  1096.       has(target, prop) {
  1097.         return (prop in target);
  1098.       },
  1099.       deleteProperty(target, prop) {
  1100.         return true;
  1101.       },
  1102.       ownKeys(target) {
  1103.         return Object.keys(target);
  1104.       },
  1105.       defineProperty(target, key, descriptor) {
  1106.         return Object.defineProperty(target, key, descriptor);
  1107.       },
  1108.       getOwnPropertyDescriptor(target, key) {
  1109.         return Object.getOwnPropertyDescriptor(target, key);
  1110.       },
  1111.  
  1112.     });
  1113.  
  1114.     const setupStyle = (m1, m2) => {
  1115.       if (!ENABLE_NO_SMOOTH_TRANSFORM) return;
  1116.  
  1117.       const dummy1v = {
  1118.         transform: '',
  1119.         height: '',
  1120.         minHeight: '',
  1121.         paddingBottom: '',
  1122.         paddingTop: ''
  1123.       };
  1124.  
  1125.       const dummyStyleFn = (k) => (function () { const style = this[sp7]; return style[k](...arguments); });
  1126.       for (const k of ['toString', 'getPropertyPriority', 'getPropertyValue', 'item', 'removeProperty', 'setProperty']) {
  1127.         dummy1v[k] = dummyStyleFn(k);
  1128.       }
  1129.  
  1130.       const dummy1p = proxyHelperFn(dummy1v);
  1131.       const sp1v = new Proxy(m1.style, dummy1p);
  1132.       const sp2v = new Proxy(m2.style, dummy1p);
  1133.       Object.defineProperty(m1, 'style', { get() { return sp1v }, set() { }, enumerable: true, configurable: true });
  1134.       Object.defineProperty(m2, 'style', { get() { return sp2v }, set() { }, enumerable: true, configurable: true });
  1135.       m1.removeAttribute("style");
  1136.       m2.removeAttribute("style");
  1137.  
  1138.     }
  1139.  
  1140.     return { setupStyle };
  1141.  
  1142.   })();
  1143.  
  1144.  
  1145.  
  1146.   function setThumbnails(config) {
  1147.  
  1148.     const { baseObject, thumbnails, flag0, imageLinks } = config;
  1149.  
  1150.     if (flag0 || (ENABLE_PRELOAD_THUMBNAIL && imageLinks)) {
  1151.  
  1152.  
  1153.       if (thumbnails && thumbnails.length > 0) {
  1154.         if (flag0 > 0 && thumbnails.length > 1) {
  1155.           let pSize = 0;
  1156.           let newThumbnails = [];
  1157.           for (const thumbnail of thumbnails) {
  1158.             if (!thumbnail || !thumbnail.url) continue;
  1159.             const squarePhoto = thumbnail.width === thumbnail.height && typeof thumbnail.width === 'number';
  1160.             const condSize = pSize <= 0 || (flag0 === 1 ? pSize > thumbnail.width : pSize < thumbnail.width);
  1161.             const leastSizeFulfilled = squarePhoto ? thumbnail.width >= LEAST_IMAGE_SIZE : true;
  1162.             if ((!squarePhoto || condSize) && leastSizeFulfilled) {
  1163.               newThumbnails.push(thumbnail);
  1164.               if (imageLinks) imageLinks.add(thumbnail.url);
  1165.             }
  1166.             if (squarePhoto && condSize && leastSizeFulfilled) {
  1167.               pSize = thumbnail.width;
  1168.             }
  1169.           }
  1170.           if (thumbnails.length !== newThumbnails.length && thumbnails === baseObject.thumbnails && newThumbnails.length > 0) {
  1171.             baseObject.thumbnails = newThumbnails;
  1172.           } else {
  1173.             newThumbnails.length = 0;
  1174.           }
  1175.           newThumbnails = null;
  1176.         } else {
  1177.           for (const thumbnail of thumbnails) {
  1178.             if (thumbnail && thumbnail.url) {
  1179.               if (imageLinks) imageLinks.add(thumbnail.url);
  1180.             }
  1181.           }
  1182.         }
  1183.       }
  1184.  
  1185.     }
  1186.   }
  1187.  
  1188.   function fixLiveChatItem(item, imageLinks) {
  1189.     const liveChatTextMessageRenderer = (item || 0).liveChatTextMessageRenderer || 0;
  1190.     if (liveChatTextMessageRenderer) {
  1191.       const messageRuns = (liveChatTextMessageRenderer.message || 0).runs || 0;
  1192.       if (messageRuns && messageRuns.length > 0) {
  1193.         for (const run of messageRuns) {
  1194.           const emojiImage = (((run || 0).emoji || 0).image || 0);
  1195.           setThumbnails({
  1196.             baseObject: emojiImage,
  1197.             thumbnails: emojiImage.thumbnails,
  1198.             flag0: EMOJI_IMAGE_SINGLE_THUMBNAIL,
  1199.             imageLinks
  1200.           });
  1201.         }
  1202.       }
  1203.       const authorPhoto = liveChatTextMessageRenderer.authorPhoto || 0;
  1204.       setThumbnails({
  1205.         baseObject: authorPhoto,
  1206.         thumbnails: authorPhoto.thumbnails,
  1207.         flag0: AUTHOR_PHOTO_SINGLE_THUMBNAIL,
  1208.         imageLinks
  1209.       });
  1210.     }
  1211.   }
  1212.  
  1213.  
  1214.   const flagsFnOnInterval = (ENABLE_FLAGS_MAINTAIN_STABLE_LIST || ENABLE_FLAGS_REUSE_COMPONENTS) ? (() => {
  1215.  
  1216.     const flags = () => {
  1217.       try {
  1218.         return ytcfg.data_.EXPERIMENT_FLAGS;
  1219.       } catch (e) { }
  1220.       return null;
  1221.     };
  1222.  
  1223.     const flagsForced = () => {
  1224.       try {
  1225.         return ytcfg.data_.EXPERIMENTS_FORCED_FLAGS;
  1226.       } catch (e) { }
  1227.       return null;
  1228.     };
  1229.  
  1230.     const flagsFn = (EXPERIMENT_FLAGS) => {
  1231.  
  1232.       if (!EXPERIMENT_FLAGS) return;
  1233.  
  1234.       if (ENABLE_FLAGS_MAINTAIN_STABLE_LIST) {
  1235.         if (USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET ? EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list === true : true) {
  1236.           EXPERIMENT_FLAGS.kevlar_tuner_should_test_maintain_stable_list = true;
  1237.           EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list = true;
  1238.         }
  1239.       }
  1240.  
  1241.       if (ENABLE_FLAGS_REUSE_COMPONENTS) {
  1242.         EXPERIMENT_FLAGS.kevlar_tuner_should_test_reuse_components = true;
  1243.         EXPERIMENT_FLAGS.kevlar_tuner_should_reuse_components = true;
  1244.       }
  1245.  
  1246.     };
  1247.  
  1248.     const uf = (EXPERIMENT_FLAGS) => {
  1249.       if (EXPERIMENT_FLAGS === undefined) EXPERIMENT_FLAGS = flags();
  1250.       if (EXPERIMENT_FLAGS) {
  1251.         flagsFn(EXPERIMENT_FLAGS);
  1252.         flagsFn(flagsForced());
  1253.       }
  1254.     }
  1255.  
  1256.     uf();
  1257.  
  1258.     const flagsFnOnInterval = (setInterval, clearInterval) => {
  1259.  
  1260.       uf();
  1261.       let cidFlags = 0;
  1262.       let kd = 0;
  1263.       new Promise(flagResolve => {
  1264.  
  1265.         const flagTimer = () => {
  1266.           const EXPERIMENT_FLAGS = flags();
  1267.           if (!EXPERIMENT_FLAGS) return;
  1268.           uf(EXPERIMENT_FLAGS);
  1269.           if (kd > 0) return;
  1270.           kd = 1;
  1271.           const delay1000 = new Promise(resolve => setTimeout(resolve, 1000));
  1272.           const moDeferred = new Promise(resolve => {
  1273.             let mo = new MutationObserver(() => {
  1274.               if (mo) {
  1275.                 mo.disconnect();
  1276.                 mo.takeRecords();
  1277.                 mo = null;
  1278.                 resolve();
  1279.               }
  1280.             });
  1281.             mo.observe(document, { subtree: true, childList: true });
  1282.           });
  1283.           Promise.race([delay1000, moDeferred]).then(flagResolve);
  1284.         };
  1285.  
  1286.         uf();
  1287.         cidFlags = setInterval(flagTimer, 1);
  1288.       }).then(() => {
  1289.         if (cidFlags > 0) clearInterval(cidFlags);
  1290.         cidFlags = 0;
  1291.         uf();
  1292.       });
  1293.  
  1294.     }
  1295.  
  1296.     return flagsFnOnInterval;
  1297.  
  1298.   })() : null;
  1299.  
  1300.   let kptPF = null;
  1301.   const emojiPrefetched = new Set();
  1302.   const authorPhotoPrefetched = new Set();
  1303.  
  1304.   function linker(link, rel, href, _as) {
  1305.     return new Promise(resolve => {
  1306.       if (!link) link = document.createElement('link');
  1307.       link.rel = rel;
  1308.       if (_as) link.setAttribute('as', _as);
  1309.       link.onload = function () {
  1310.         resolve({
  1311.           link: this,
  1312.           success: true
  1313.         })
  1314.         this.remove();
  1315.       };
  1316.       link.onerror = function () {
  1317.         resolve({
  1318.           link: this,
  1319.           success: false
  1320.         });
  1321.         this.remove();
  1322.       };
  1323.       link.href = href;
  1324.       document.head.appendChild(link);
  1325.       link = null;
  1326.     });
  1327.   }
  1328.  
  1329.  
  1330.   const cleanContext = async (win) => {
  1331.     const waitFn = requestAnimationFrame; // shall have been binded to window
  1332.     try {
  1333.       let mx = 16; // MAX TRIAL
  1334.       const frameId = 'vanillajs-iframe-v1';
  1335.       /** @type {HTMLIFrameElement | null} */
  1336.       let frame = document.getElementById(frameId);
  1337.       let removeIframeFn = null;
  1338.       if (!frame) {
  1339.         frame = document.createElement('iframe');
  1340.         frame.id = 'vanillajs-iframe-v1';
  1341.         frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
  1342.         let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
  1343.         n.appendChild(frame);
  1344.         while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
  1345.         const root = document.documentElement;
  1346.         root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
  1347.         removeIframeFn = (setTimeout) => {
  1348.           const removeIframeOnDocumentReady = (e) => {
  1349.             e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  1350.             win = null;
  1351.             setTimeout(() => {
  1352.               n.remove();
  1353.               n = null;
  1354.             }, 200);
  1355.           }
  1356.           if (document.readyState !== 'loading') {
  1357.             removeIframeOnDocumentReady();
  1358.           } else {
  1359.             win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  1360.           }
  1361.         }
  1362.       }
  1363.       while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
  1364.       const fc = frame.contentWindow;
  1365.       if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
  1366.       const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval } = fc;
  1367.       const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval };
  1368.       for (let k in res) res[k] = res[k].bind(win); // necessary
  1369.       if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
  1370.       res.animate = HTMLElement.prototype.animate;
  1371.       return res;
  1372.     } catch (e) {
  1373.       console.warn(e);
  1374.       return null;
  1375.     }
  1376.   };
  1377.  
  1378.   cleanContext(win).then(__CONTEXT__ => {
  1379.     if (!__CONTEXT__) return null;
  1380.  
  1381.     const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, animate } = __CONTEXT__;
  1382.  
  1383.     let aeConstructor = null;
  1384.  
  1385.     // << if ENABLE_VIDEO_PROGRESS_STATE_FIX >>
  1386.     let pairForPauseResume = 0; // each increasion = number of ticker
  1387.     let pairForPauseResumeM = 0;
  1388.     // << end >>
  1389.  
  1390.     // << __openedChanged82 >>
  1391.     let currentMenuPivotWR = null;
  1392.  
  1393.     // << if DO_PARTICIPANT_LIST_HACKS >>
  1394.     const beforeParticipantsMap = new WeakMap();
  1395.     // << end >>
  1396.  
  1397.  
  1398.  
  1399.     // << if onRegistryReadyForDOMOperations >>
  1400.  
  1401.     let dt0 = Date.now() - 2000;
  1402.     const dateNow = () => Date.now() - dt0;
  1403.     // let lastScroll = 0;
  1404.     // let lastLShow = 0;
  1405.     let lastWheel = 0;
  1406.     let lastMouseDown = 0;
  1407.     let lastMouseUp = 0;
  1408.     let currentMouseDown = false;
  1409.     let lastTouchDown = 0;
  1410.     let lastTouchUp = 0;
  1411.     let currentTouchDown = false;
  1412.     let lastUserInteraction = 0;
  1413.  
  1414.     let scrollChatFn = null;
  1415.  
  1416.     let skipDontRender = true; // true first; false by flushActiveItems_
  1417.     let allowDontRender = null;
  1418.  
  1419.     // ---- #items mutation ----
  1420.     let sk35zResolveFn = null;
  1421.     let firstList = true;
  1422.  
  1423.     // << end >>
  1424.  
  1425.     class RAFHub {
  1426.       constructor() {
  1427.         /** @type {number} */
  1428.         this.startAt = 8170;
  1429.         /** @type {number} */
  1430.         this.counter = 0;
  1431.         /** @type {number} */
  1432.         this.rid = 0;
  1433.         /** @type {Map<number, FrameRequestCallback>} */
  1434.         this.funcs = new Map();
  1435.         const funcs = this.funcs;
  1436.         /** @type {FrameRequestCallback} */
  1437.         this.bCallback = this.mCallback.bind(this);
  1438.         this.pClear = () => funcs.clear();
  1439.       }
  1440.       /** @param {DOMHighResTimeStamp} highResTime */
  1441.       mCallback(highResTime) {
  1442.         this.rid = 0;
  1443.         Promise.resolve().then(this.pClear);
  1444.         this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
  1445.       }
  1446.       /** @param {FrameRequestCallback} f */
  1447.       request(f) {
  1448.         if (this.counter > 1e9) this.counter = 9;
  1449.         let cid = this.startAt + (++this.counter);
  1450.         this.funcs.set(cid, f);
  1451.         if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
  1452.         return cid;
  1453.       }
  1454.       /** @param {number} cid */
  1455.       cancel(cid) {
  1456.         cid = +cid;
  1457.         if (cid > 0) {
  1458.           if (cid <= this.startAt) {
  1459.             return cancelAnimationFrame(cid);
  1460.           }
  1461.           if (this.rid > 0) {
  1462.             this.funcs.delete(cid);
  1463.             if (this.funcs.size === 0) {
  1464.               cancelAnimationFrame(this.rid);
  1465.               this.rid = 0;
  1466.             }
  1467.           }
  1468.         }
  1469.       }
  1470.     }
  1471.  
  1472.     function basePrefetching() {
  1473.  
  1474.       new Promise(resolve => {
  1475.  
  1476.         if (document.readyState !== 'loading') {
  1477.           resolve();
  1478.         } else {
  1479.           win.addEventListener("DOMContentLoaded", resolve, false);
  1480.         }
  1481.  
  1482.       }).then(() => {
  1483.         const hostL1 = [
  1484.           'https://www.youtube.com', 'https://googlevideo.com',
  1485.           'https://googleapis.com', 'https://accounts.youtube.com',
  1486.           'https://www.gstatic.com', 'https://ggpht.com',
  1487.           'https://yt3.ggpht.com', 'https://yt4.ggpht.com'
  1488.         ];
  1489.  
  1490.         const hostL2 = [
  1491.           'https://youtube.com',
  1492.           'https://fonts.googleapis.com', 'https://fonts.gstatic.com'
  1493.         ];
  1494.  
  1495.         let link = null;
  1496.  
  1497.         function kn() {
  1498.  
  1499.           link = document.createElement('link');
  1500.           if (link.relList && link.relList.supports) {
  1501.             kptPF = (link.relList.supports('dns-prefetch') ? 1 : 0) + (link.relList.supports('preconnect') ? 2 : 0) + (link.relList.supports('prefetch') ? 4 : 0) + (link.relList.supports('subresource') ? 8 : 0) + (link.relList.supports('preload') ? 16 : 0)
  1502.           } else {
  1503.             kptPF = 0;
  1504.           }
  1505.  
  1506.           groupCollapsed("YouTube Super Fast Chat", " | PREFETCH SUPPORTS");
  1507.           if (ENABLE_BASE_PREFETCHING) console.log('dns-prefetch', (kptPF & 1) ? 'OK' : 'NG');
  1508.           if (ENABLE_BASE_PREFETCHING) console.log('preconnect', (kptPF & 2) ? 'OK' : 'NG');
  1509.           if (ENABLE_PRELOAD_THUMBNAIL) console.log('prefetch', (kptPF & 4) ? 'OK' : 'NG');
  1510.           // console.log('subresource', (kptPF & 8) ? 'OK' : 'NG');
  1511.           if (ENABLE_PRELOAD_THUMBNAIL) console.log('preload', (kptPF & 16) ? 'OK' : 'NG');
  1512.           console.groupEnd();
  1513.  
  1514.         }
  1515.  
  1516.         for (const h of hostL1) {
  1517.  
  1518.           if (kptPF === null) kn();
  1519.           if (ENABLE_BASE_PREFETCHING) {
  1520.             // if (kptPF & 1) {
  1521.             //   linker(link, 'dns-prefetch', h);
  1522.             //   link = null;
  1523.             // }
  1524.             if (kptPF & 2) {
  1525.               linker(link, 'preconnect', h);
  1526.               link = null;
  1527.             }
  1528.           }
  1529.         }
  1530.  
  1531.         for (const h of hostL2) {
  1532.           if (kptPF === null) kn();
  1533.           if (ENABLE_BASE_PREFETCHING) {
  1534.             if (kptPF & 1) {
  1535.               linker(link, 'dns-prefetch', h);
  1536.               link = null;
  1537.             }
  1538.           }
  1539.         }
  1540.  
  1541.       })
  1542.  
  1543.  
  1544.     }
  1545.  
  1546.     if (flagsFnOnInterval) flagsFnOnInterval(setInterval, clearInterval);
  1547.  
  1548.     if (DO_LINK_PREFETCH) basePrefetching();
  1549.  
  1550.     const { notifyPath7081 } = (() => {
  1551.       // DO_PARTICIPANT_LIST_HACKS
  1552.  
  1553.       const mutexParticipants = new Mutex();
  1554.  
  1555.       let uvid = 0;
  1556.       let r95dm = 0;
  1557.       let c95dm = -1;
  1558.  
  1559.       const foundMap = (base, content) => {
  1560.         /*
  1561.           let lastSearch = 0;
  1562.           let founds = base.map(baseEntry => {
  1563.             let search = content.indexOf(baseEntry, lastSearch);
  1564.             if (search < 0) return false;
  1565.             lastSearch = search + 1;
  1566.             return true;
  1567.           });
  1568.           return founds;
  1569.         */
  1570.         const contentSet = new Set(content);
  1571.         return base.map(baseEntry => contentSet.has(baseEntry));
  1572.  
  1573.       }
  1574.  
  1575.  
  1576.  
  1577.       const spliceIndicesFunc = (beforeParticipants, participants, idsBefore, idsAfter) => {
  1578.  
  1579.         const handler1 = {
  1580.           get(target, prop, receiver) {
  1581.             if (prop === 'object') {
  1582.               return participants; // avoid memory leakage
  1583.             }
  1584.             if (prop === 'type') {
  1585.               return 'splice';
  1586.             }
  1587.             return target[prop];
  1588.           }
  1589.         };
  1590.         const releaser = () => {
  1591.           participants = null;
  1592.         }
  1593.  
  1594.         let foundsForAfter = foundMap(idsAfter, idsBefore);
  1595.         let foundsForBefore = foundMap(idsBefore, idsAfter);
  1596.  
  1597.         let indexSplices = [];
  1598.         let contentUpdates = [];
  1599.         for (let i = 0, j = 0; i < foundsForBefore.length || j < foundsForAfter.length;) {
  1600.           if (beforeParticipants[i] === participants[j]) {
  1601.             i++; j++;
  1602.           } else if (idsBefore[i] === idsAfter[j]) {
  1603.             // content changed
  1604.             contentUpdates.push({ indexI: i, indexJ: j })
  1605.             i++; j++;
  1606.           } else {
  1607.             let addedCount = 0;
  1608.             for (let q = j; q < foundsForAfter.length; q++) {
  1609.               if (foundsForAfter[q] === false) addedCount++;
  1610.               else break;
  1611.             }
  1612.             let removedCount = 0;
  1613.             for (let q = i; q < foundsForBefore.length; q++) {
  1614.               if (foundsForBefore[q] === false) removedCount++;
  1615.               else break;
  1616.             }
  1617.             if (!addedCount && !removedCount) {
  1618.               throw 'ERROR(0xFF32): spliceIndicesFunc';
  1619.             }
  1620.             indexSplices.push(new Proxy({
  1621.               index: j,
  1622.               addedCount: addedCount,
  1623.               removed: removedCount >= 1 ? beforeParticipants.slice(i, i + removedCount) : []
  1624.             }, handler1));
  1625.             i += removedCount;
  1626.             j += addedCount;
  1627.           }
  1628.         }
  1629.         foundsForBefore = null;
  1630.         foundsForAfter = null;
  1631.         idsBefore = null;
  1632.         idsAfter = null;
  1633.         beforeParticipants = null;
  1634.         return { indexSplices, contentUpdates, releaser };
  1635.  
  1636.       }
  1637.  
  1638.       /*
  1639.  
  1640.       customElements.get("yt-live-chat-participant-renderer").prototype.notifyPath=function(){  console.log(123);  console.log(new Error().stack)}
  1641.  
  1642.       VM63631:1 Error
  1643.       at customElements.get.notifyPath (<anonymous>:1:122)
  1644.       at e.forwardRendererStamperChanges_ (live_chat_polymer.js:4453:35)
  1645.       at e.rendererStamperApplyChangeRecord_ (live_chat_polymer.js:4451:12)
  1646.       at e.rendererStamperObserver_ (live_chat_polymer.js:4448:149)
  1647.       at Object.pu [as fn] (live_chat_polymer.js:1692:118)
  1648.       at ju (live_chat_polymer.js:1674:217)
  1649.       at a._propertiesChanged (live_chat_polymer.js:1726:122)
  1650.       at b._flushProperties (live_chat_polymer.js:1597:200)
  1651.       at a._invalidateProperties (live_chat_polymer.js:1718:69)
  1652.       at a.notifyPath (live_chat_polymer.js:1741:182)
  1653.  
  1654.       */
  1655.  
  1656.       function convertToIds(participants) {
  1657.         return participants.map(participant => {
  1658.           if (!participant || typeof participant !== 'object') {
  1659.             console.warn('Error(0xFA41): convertToIds', participant);
  1660.             return participant; // just in case
  1661.           }
  1662.           let keys = Object.keys(participant);
  1663.           // liveChatTextMessageRenderer
  1664.           // liveChatParticipantRenderer - livestream channel owner [no authorExternalChannelId]
  1665.           // liveChatPaidMessageRenderer
  1666.           /*
  1667.  
  1668.             'yt-live-chat-participant-renderer' utilizes the following:
  1669.             authorName.simpleText: string
  1670.             authorPhoto.thumbnails: Object{url:string, width:int, height:int} []
  1671.             authorBadges[].liveChatAuthorBadgeRenderer.icon.iconType: string
  1672.             authorBadges[].liveChatAuthorBadgeRenderer.tooltip: string
  1673.             authorBadges[].liveChatAuthorBadgeRenderer.accessibility.accessibilityData: Object{label:string}
  1674.  
  1675.           */
  1676.           if (keys.length !== 1) {
  1677.             console.warn('Error(0xFA42): convertToIds', participant);
  1678.             return participant; // just in case
  1679.           }
  1680.           let key = keys[0];
  1681.           let renderer = (participant[key] || 0);
  1682.           let authorName = (renderer.authorName || 0);
  1683.           let text = `${authorName.simpleText || authorName.text}`
  1684.           let res = participant; // fallback if it is not a vaild entry
  1685.           if (typeof text !== 'string') {
  1686.             console.warn('Error(0xFA53): convertToIds', participant);
  1687.           } else {
  1688.             text = `${renderer.authorExternalChannelId || 'null'}|${text || ''}`;
  1689.             if (text.length > 1) res = text;
  1690.           }
  1691.           return res;
  1692.           // return renderer?`${renderer.id}|${renderer.authorExternalChannelId}`: '';
  1693.           // note: renderer.id will be changed if the user typed something to trigger the update of the participants' record.
  1694.         });
  1695.       }
  1696.  
  1697.       const checkChangeToParticipantRendererContent = CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT ? (p1, p2) => {
  1698.         // just update when content is changed.
  1699.         if (p1.authorName !== p2.authorName) return true;
  1700.         if (p1.authorPhoto !== p2.authorPhoto) return true;
  1701.         if (p1.authorBadges !== p2.authorBadges) return true;
  1702.         return false;
  1703.       } : (p1, p2) => {
  1704.         // keep integrity all the time.
  1705.         return p1 !== p2; // always true
  1706.       }
  1707.  
  1708.       function notifyPath7081(path) { // cnt "yt-live-chat-participant-list-renderer"
  1709.  
  1710.         if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
  1711.           if (path !== "participantsManager.participants") {
  1712.             return this.__notifyPath5036__.apply(this, arguments);
  1713.           }
  1714.           if (c95dm === r95dm) return;
  1715.         } else {
  1716.           const stack = new Error().stack;
  1717.           if (path !== "participantsManager.participants" || stack.indexOf('.onParticipantsChanged') < 0) {
  1718.             return this.__notifyPath5036__.apply(this, arguments);
  1719.           }
  1720.         }
  1721.  
  1722.         if (uvid > 1e8) uvid = uvid % 100;
  1723.         let tid = ++uvid;
  1724.  
  1725.         const cnt = this; // "yt-live-chat-participant-list-renderer"
  1726.         mutexParticipants.lockWith(lockResolve => {
  1727.  
  1728.           const participants00 = cnt.participantsManager.participants;
  1729.  
  1730.           if (tid !== uvid || typeof (participants00 || 0).splice !== 'function') {
  1731.             lockResolve();
  1732.             return;
  1733.           }
  1734.  
  1735.           let doUpdate = false;
  1736.  
  1737.           if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
  1738.  
  1739.             if (!participants00.r94dm) {
  1740.               participants00.r94dm = 1;
  1741.               if (++r95dm > 1e9) r95dm = 9;
  1742.               participants00.push = function () {
  1743.                 if (++r95dm > 1e9) r95dm = 9;
  1744.                 return Array.prototype.push.apply(this, arguments);
  1745.               }
  1746.               participants00.pop = function () {
  1747.                 if (++r95dm > 1e9) r95dm = 9;
  1748.                 return Array.prototype.pop.apply(this, arguments);
  1749.               }
  1750.               participants00.shift = function () {
  1751.                 if (++r95dm > 1e9) r95dm = 9;
  1752.                 return Array.prototype.shift.apply(this, arguments);
  1753.               }
  1754.               participants00.unshift = function () {
  1755.                 if (++r95dm > 1e9) r95dm = 9;
  1756.                 return Array.prototype.unshift.apply(this, arguments);
  1757.               }
  1758.               participants00.splice = function () {
  1759.                 if (++r95dm > 1e9) r95dm = 9;
  1760.                 return Array.prototype.splice.apply(this, arguments);
  1761.               }
  1762.               participants00.sort = function () {
  1763.                 if (++r95dm > 1e9) r95dm = 9;
  1764.                 return Array.prototype.sort.apply(this, arguments);
  1765.               }
  1766.               participants00.reverse = function () {
  1767.                 if (++r95dm > 1e9) r95dm = 9;
  1768.                 return Array.prototype.reverse.apply(this, arguments);
  1769.               }
  1770.             }
  1771.  
  1772.             if (c95dm !== r95dm) {
  1773.               c95dm = r95dm;
  1774.               doUpdate = true;
  1775.             }
  1776.  
  1777.           } else {
  1778.             doUpdate = true;
  1779.           }
  1780.  
  1781.           if (!doUpdate) {
  1782.             lockResolve();
  1783.             return;
  1784.           }
  1785.  
  1786.           const participants = participants00.slice(0);
  1787.           const beforeParticipants = beforeParticipantsMap.get(cnt) || [];
  1788.           beforeParticipantsMap.set(cnt, participants);
  1789.  
  1790.           const resPromise = (async () => {
  1791.  
  1792.             if (beforeParticipants.length === 0) {
  1793.               // not error
  1794.               return 0;
  1795.             }
  1796.  
  1797.             let countOfElements = cnt.__getAllParticipantsDOMRenderedLength__()
  1798.  
  1799.             // console.log(participants.length, doms.length) // different if no requestAnimationFrame
  1800.             if (beforeParticipants.length !== countOfElements) {
  1801.               // there is somewrong for the cache. - sometimes happen
  1802.               return 0;
  1803.             }
  1804.  
  1805.             const idsBefore = convertToIds(beforeParticipants);
  1806.             const idsAfter = convertToIds(participants);
  1807.  
  1808.             let { indexSplices, contentUpdates, releaser } = spliceIndicesFunc(beforeParticipants, participants, idsBefore, idsAfter);
  1809.  
  1810.             let res = 1; // default 1 for no update
  1811.  
  1812.             if (indexSplices.length >= 1) {
  1813.  
  1814.  
  1815.               // let p2 =  participants.slice(indexSplices[0].index, indexSplices[0].index+indexSplices[0].addedCount);
  1816.               // let p1 = indexSplices[0].removed;
  1817.               // console.log(indexSplices.length, indexSplices ,p1,p2,  convertToIds(p1),convertToIds(p2))
  1818.  
  1819.               /* folllow
  1820.                   a.notifyPath(c + ".splices", d);
  1821.                   a.notifyPath(c + ".length", b.length);
  1822.               */
  1823.               // stampDomArraySplices_
  1824.  
  1825.  
  1826.               await new Promise(resolve => {
  1827.                 cnt.resolveForDOMRendering781 = resolve;
  1828.  
  1829.                 cnt.__notifyPath5036__("participantsManager.participants.splices", {
  1830.                   indexSplices
  1831.                 });
  1832.                 indexSplices = null;
  1833.                 releaser();
  1834.                 releaser = null;
  1835.                 cnt.__notifyPath5036__("participantsManager.participants.length",
  1836.                   participants.length
  1837.                 );
  1838.  
  1839.               });
  1840.  
  1841.               await Promise.resolve(0); // play safe for the change of 'length'
  1842.               countOfElements = cnt.__getAllParticipantsDOMRenderedLength__();
  1843.  
  1844.               let wrongSize = participants.length !== countOfElements
  1845.               if (wrongSize) {
  1846.                 console.warn("ERROR(0xE2C3): notifyPath7081", beforeParticipants.length, participants.length, doms.length)
  1847.                 return 0;
  1848.               }
  1849.  
  1850.               res = 2 | 4;
  1851.  
  1852.             } else {
  1853.  
  1854.               indexSplices = null;
  1855.               releaser();
  1856.               releaser = null;
  1857.  
  1858.               if (participants.length !== countOfElements) {
  1859.                 // other unhandled cases
  1860.                 return 0;
  1861.               }
  1862.  
  1863.             }
  1864.  
  1865.             // participants.length === countOfElements before contentUpdates
  1866.             if (contentUpdates.length >= 1) {
  1867.               for (const contentUpdate of contentUpdates) {
  1868.                 let isChanged = checkChangeToParticipantRendererContent(beforeParticipants[contentUpdate.indexI], participants[contentUpdate.indexJ]);
  1869.                 if (isChanged) {
  1870.                   cnt.__notifyPath5036__(`participantsManager.participants[${contentUpdate.indexJ}]`);
  1871.                   res |= 4 | 8;
  1872.                 }
  1873.               }
  1874.             }
  1875.             contentUpdates = null;
  1876.  
  1877.             return res;
  1878.  
  1879.  
  1880.           })();
  1881.  
  1882.  
  1883.           resPromise.then(resValue => {
  1884.  
  1885.             const isLogRequired = SHOW_PARTICIPANT_CHANGES_IN_CONSOLE && ((resValue === 0) || ((resValue & 4) === 4));
  1886.             isLogRequired && groupCollapsed("Participant List Change", `tid = ${tid}; res = ${resValue}`);
  1887.             if (resValue === 0) {
  1888.               new Promise(resolve => {
  1889.                 cnt.resolveForDOMRendering781 = resolve;
  1890.                 isLogRequired && console.log("Full Refresh begins");
  1891.                 cnt.__notifyPath5036__("participantsManager.participants"); // full refresh
  1892.               }).then(() => {
  1893.                 isLogRequired && console.log("Full Refresh ends");
  1894.                 console.groupEnd();
  1895.               }).then(lockResolve);
  1896.               return;
  1897.             }
  1898.  
  1899.             const delayLockResolve = (resValue & 4) === 4;
  1900.  
  1901.             if (delayLockResolve) {
  1902.               isLogRequired && console.log(`Number of participants (before): ${beforeParticipants.length}`);
  1903.               isLogRequired && console.log(`Number of participants (after): ${participants.length}`);
  1904.               isLogRequired && console.log(`Total number of rendered participants: ${cnt.__getAllParticipantsDOMRenderedLength__()}`);
  1905.               isLogRequired && console.log(`Participant Renderer Content Updated: ${(resValue & 8) === 8}`);
  1906.               isLogRequired && console.groupEnd();
  1907.               // requestAnimationFrame is required to avoid particiant update during DOM changing (stampDomArraySplices_)
  1908.               // mutex lock with requestAnimationFrame can also disable participants update in background
  1909.               requestAnimationFrame(lockResolve);
  1910.             } else {
  1911.               lockResolve();
  1912.             }
  1913.  
  1914.           });
  1915.  
  1916.         });
  1917.  
  1918.       }
  1919.  
  1920.       return { notifyPath7081 };
  1921.  
  1922.     })();
  1923.  
  1924.  
  1925.     const onRegistryReadyForDataManipulation = () => {
  1926.  
  1927.       function dummy5035(a, b, c) { }
  1928.       function dummy411(a, b, c) { }
  1929.  
  1930.       customElements.whenDefined("yt-live-chat-participant-list-renderer").then(() => {
  1931.  
  1932.         if (!DO_PARTICIPANT_LIST_HACKS) return;
  1933.  
  1934.         const tag = "yt-live-chat-participant-list-renderer";
  1935.         const cProto = getProto(document.createElement(tag));
  1936.         if (!cProto || typeof cProto.attached !== 'function') {
  1937.           // for _registered, proto.attached shall exist when the element is defined.
  1938.           // for controller extraction, attached shall exist when instance creates.
  1939.           console.warn(`proto.attached for ${tag} is unavailable.`);
  1940.           return;
  1941.         }
  1942.  
  1943.  
  1944.         groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-participant-list-renderer hacks");
  1945.  
  1946.         const fgsArr = ['kevlar_tuner_should_test_maintain_stable_list', 'kevlar_should_maintain_stable_list', 'kevlar_tuner_should_test_reuse_components', 'kevlar_tuner_should_reuse_components'];
  1947.         const fgs = {};
  1948.         for (const key of fgsArr) fgs[key] = undefined;
  1949.  
  1950.         try {
  1951.           const EXPERIMENT_FLAGS = ytcfg.data_.EXPERIMENT_FLAGS;
  1952.           for (const key of fgsArr) fgs[key] = EXPERIMENT_FLAGS[key];
  1953.         } catch (e) { }
  1954.         console.log(`EXPERIMENT_FLAGS: ${JSON.stringify(fgs, null, 2)}`);
  1955.  
  1956.         const canDoReplacement = (() => {
  1957.           if (typeof cProto.__notifyPath5035__ === 'function' && cProto.__notifyPath5035__.name !== 'dummy5035') {
  1958.             console.warn('YouTube Live Chat Tamer is running.');
  1959.             return;
  1960.           }
  1961.  
  1962.           if (typeof cProto.__attached411__ === 'function' && cProto.__attached411__.name !== 'dummy411') {
  1963.             console.warn('YouTube Live Chat Tamer is running.');
  1964.             return;
  1965.           }
  1966.  
  1967.           cProto.__notifyPath5035__ = dummy5035 // just to against Live Chat Tamer
  1968.           cProto.__attached411__ = dummy411 // just to against Live Chat Tamer
  1969.  
  1970.           if (typeof cProto.flushRenderStamperComponentBindings_ !== 'function' || cProto.flushRenderStamperComponentBindings_.length !== 0) {
  1971.             console.warn("ERROR(0xE355): cProto.flushRenderStamperComponentBindings_ not found");
  1972.             return;
  1973.           }
  1974.  
  1975.           if (typeof cProto.flushRenderStamperComponentBindings66_ === 'function') {
  1976.             console.warn("ERROR(0xE356): cProto.flushRenderStamperComponentBindings66_");
  1977.             return;
  1978.           }
  1979.  
  1980.           if (typeof cProto.__getAllParticipantsDOMRenderedLength__ === 'function') {
  1981.             console.warn("ERROR(0xE357): cProto.__getAllParticipantsDOMRenderedLength__");
  1982.             return;
  1983.           }
  1984.           return true;
  1985.         })();
  1986.  
  1987.         console.log(`Data Manipulation Boost = ${canDoReplacement}`);
  1988.  
  1989.         assertor(() => fnIntegrity(cProto.attached, '0.32.22')) // just warning
  1990.         if (typeof cProto.flushRenderStamperComponentBindings_ === 'function') {
  1991.           const fiRSCB = fnIntegrity(cProto.flushRenderStamperComponentBindings_);
  1992.           const s = fiRSCB.split('.');
  1993.           if (s[0] === '0' && +s[1] > 381 && +s[1] < 391 && +s[2] > 228 && +s[2] < 238) {
  1994.             console.log(`flushRenderStamperComponentBindings_ ### ${fiRSCB} ### - OK`);
  1995.           } else {
  1996.             console.log(`flushRenderStamperComponentBindings_ ### ${fiRSCB} ### - Failed`);
  1997.           }
  1998.         } else {
  1999.           console.log("flushRenderStamperComponentBindings_ - not found");
  2000.         }
  2001.         // assertor(() => fnIntegrity(cProto.flushRenderStamperComponentBindings_, '0.386.233')) // just warning
  2002.  
  2003.         if (typeof cProto.flushRenderStamperComponentBindings_ === 'function') {
  2004.           cProto.flushRenderStamperComponentBindings66_ = cProto.flushRenderStamperComponentBindings_;
  2005.           cProto.flushRenderStamperComponentBindings_ = function () {
  2006.             // console.log('flushRenderStamperComponentBindings_')
  2007.             this.flushRenderStamperComponentBindings66_();
  2008.             if (this.resolveForDOMRendering781) {
  2009.               this.resolveForDOMRendering781();
  2010.               this.resolveForDOMRendering781 = null;
  2011.             }
  2012.           };
  2013.         }
  2014.  
  2015.         cProto.__getAllParticipantsDOMRenderedLength__ = function () {
  2016.           const container = ((this || 0).$ || 0).participants;
  2017.           if (!container) return 0;
  2018.           return HTMLElement.prototype.querySelectorAll.call(container, 'yt-live-chat-participant-renderer').length;
  2019.         }
  2020.  
  2021.         const onPageElements = [...document.querySelectorAll('yt-live-chat-participant-list-renderer:not(.n9fJ3)')];
  2022.  
  2023.         cProto.__attached412__ = cProto.attached;
  2024.         const fpPList = function (hostElement) {
  2025.           const cnt = hostElement.inst || hostElement;
  2026.           if (beforeParticipantsMap.has(cnt)) return;
  2027.           hostElement.classList.add('n9fJ3');
  2028.  
  2029.           assertor(() => (cnt.__dataEnabled === true && cnt.__dataReady === true));
  2030.           if (typeof cnt.notifyPath !== 'function' || typeof cnt.__notifyPath5036__ !== 'undefined') {
  2031.             console.warn("ERROR(0xE318): yt-live-chat-participant-list-renderer")
  2032.             return;
  2033.           }
  2034.  
  2035.           groupCollapsed("Participant List attached", "");
  2036.           // cnt.$.participants.appendChild = cnt.$.participants.__shady_native_appendChild =  function(){
  2037.           //   console.log(123, 'appendChild');
  2038.           //   return HTMLElement.prototype.appendChild.apply(this, arguments)
  2039.           // }
  2040.  
  2041.           // cnt.$.participants.insertBefore =cnt.$.participants.__shady_native_insertBefore =  function(){
  2042.           //   console.log(123, 'insertBefore');
  2043.           //   return HTMLElement.prototype.insertBefore.apply(this, arguments)
  2044.           // }
  2045.  
  2046.           cnt.__notifyPath5036__ = cnt.notifyPath
  2047.           const participants = ((cnt.participantsManager || 0).participants || 0);
  2048.           assertor(() => (participants.length > -1 && typeof participants.slice === 'function'));
  2049.           console.log(`initial number of participants: ${participants.length}`);
  2050.           const newParticipants = (participants.length >= 1 && typeof participants.slice === 'function') ? participants.slice(0) : [];
  2051.           beforeParticipantsMap.set(cnt, newParticipants);
  2052.           cnt.notifyPath = notifyPath7081;
  2053.           console.log(`CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = ${CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT}`);
  2054.           console.groupEnd();
  2055.         }
  2056.         cProto.attached = function () {
  2057.           fpPList(this.hostElement || this);
  2058.           this.__attached412__.apply(this, arguments);
  2059.         };
  2060.  
  2061.  
  2062.         if (ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST) {
  2063.  
  2064.           /** @type {boolean | (()=>boolean)} */
  2065.           let toUseMaintainStableList = USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET ? (() => ytcfg.data_.EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list === true) : true;
  2066.           if (typeof cProto.stampDomArray_ === 'function' && cProto.stampDomArray_.length === 6 && !cProto.stampDomArray_.nIegT && !cProto.stampDomArray66_) {
  2067.  
  2068.             let lastMessageDate = 0;
  2069.             cProto.stampDomArray66_ = cProto.stampDomArray_;
  2070.  
  2071.             cProto.stampDomArray_ = function (...args) {
  2072.               if (args[0] && args[0].length > 0 && args[1] === "participants" && args[2] && args[3] === true && !args[5]) {
  2073.                 if (typeof toUseMaintainStableList === 'function') {
  2074.                   toUseMaintainStableList = toUseMaintainStableList();
  2075.                 }
  2076.                 args[5] = toUseMaintainStableList;
  2077.                 let currentDate = Date.now();
  2078.                 if (currentDate - lastMessageDate > 440) {
  2079.                   lastMessageDate = currentDate;
  2080.                   console.log('maintain_stable_list for participants list', toUseMaintainStableList);
  2081.                 }
  2082.               }
  2083.               return this.stampDomArray66_.apply(this, args);
  2084.             }
  2085.  
  2086.             cProto.stampDomArray_.nIegT = 1;
  2087.  
  2088.           }
  2089.           console.log(`ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST - YES`);
  2090.         } else {
  2091.           console.log(`ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST - NO`);
  2092.         }
  2093.  
  2094.         console.groupEnd();
  2095.  
  2096.         if (onPageElements.length >= 1) {
  2097.           for (const s of onPageElements) {
  2098.             if ((s.inst || s).isAttached === true) {
  2099.               fpPList(s);
  2100.             }
  2101.           }
  2102.         }
  2103.  
  2104.       }).catch(console.warn);
  2105.  
  2106.     };
  2107.  
  2108.     if (DO_PARTICIPANT_LIST_HACKS) {
  2109.       promiseForCustomYtElementsReady.then(onRegistryReadyForDataManipulation);
  2110.     }
  2111.  
  2112.  
  2113.  
  2114.     const rafHub = (ENABLE_RAF_HACK_TICKERS || ENABLE_RAF_HACK_DOCKED_MESSAGE || ENABLE_RAF_HACK_INPUT_RENDERER || ENABLE_RAF_HACK_EMOJI_PICKER) ? new RAFHub() : null;
  2115.  
  2116.  
  2117.  
  2118.  
  2119.     const bnForDelayChatOccurrence = () => {
  2120.  
  2121.       document.addEventListener('animationstart', (evt) => {
  2122.  
  2123.         if (evt.animationName === 'dontRenderAnimation') {
  2124.           evt.target.classList.remove('dont-render');
  2125.           if (scrollChatFn) scrollChatFn();
  2126.         }
  2127.  
  2128.       }, true);
  2129.  
  2130.       const f = (elm) => {
  2131.         if (elm && elm.nodeType === 1) {
  2132.           if (!skipDontRender && allowDontRender === true) {
  2133.             // innerTextFixFn();
  2134.             elm.classList.add('dont-render');
  2135.           }
  2136.         }
  2137.       }
  2138.  
  2139.       Node.prototype.__appendChild931__ = function (a) {
  2140.         a = dr(a);
  2141.         if (this.id === 'items' && this.classList.contains('yt-live-chat-item-list-renderer')) {
  2142.           if (a && a.nodeType === 1) f(a);
  2143.           else if (a instanceof DocumentFragment) {
  2144.             for (let n = a.firstChild; n; n = n.nextSibling) {
  2145.               f(n);
  2146.             }
  2147.           }
  2148.         }
  2149.       }
  2150.  
  2151.       Node.prototype.__appendChild932__ = function () {
  2152.         this.__appendChild931__.apply(this, arguments);
  2153.         return Node.prototype.appendChild.apply(this, arguments);
  2154.       }
  2155.  
  2156.  
  2157.     };
  2158.  
  2159.     const watchUserCSS = () => {
  2160.  
  2161.       // if (!CSS.supports('contain-intrinsic-size', 'auto var(--wsr94)')) return;
  2162.  
  2163.       const getElemFromWR = (nr) => {
  2164.         const n = kRef(nr);
  2165.         if (n && n.isConnected) return n;
  2166.         return null;
  2167.       }
  2168.  
  2169.       const clearContentVisibilitySizing = () => {
  2170.         Promise.resolve().then(() => {
  2171.  
  2172.           const e = document.querySelector('#show-more[disabled]');
  2173.           let btnShowMoreWR = e ? mWeakRef(e) : null;
  2174.  
  2175.           let lastVisibleItemWR = null;
  2176.           for (const elm of document.querySelectorAll('[wSr93]')) {
  2177.             if (elm.getAttribute('wSr93') === 'visible') lastVisibleItemWR = mWeakRef(elm);
  2178.             elm.setAttribute('wSr93', '');
  2179.             // custom CSS property --wsr94 not working when attribute wSr93 removed
  2180.           }
  2181.           requestAnimationFrame(() => {
  2182.             const btnShowMore = getElemFromWR(btnShowMoreWR); btnShowMoreWR = null;
  2183.             if (btnShowMore) btnShowMore.click();
  2184.             else {
  2185.               // would not work if switch it frequently
  2186.               const lastVisibleItem = getElemFromWR(lastVisibleItemWR); lastVisibleItemWR = null;
  2187.               if (lastVisibleItem) {
  2188.  
  2189.                 Promise.resolve()
  2190.                   .then(() => lastVisibleItem.scrollIntoView())
  2191.                   .then(() => lastVisibleItem.scrollIntoView(false))
  2192.                   .then(() => lastVisibleItem.scrollIntoView({ behavior: "instant", block: "end", inline: "nearest" }))
  2193.                   .catch(e => { }) // break the chain when method not callable
  2194.  
  2195.               }
  2196.             }
  2197.           });
  2198.  
  2199.         });
  2200.  
  2201.       }
  2202.  
  2203.       const mutObserver = new MutationObserver((mutations) => {
  2204.         for (const mutation of mutations) {
  2205.           if ((mutation.addedNodes || 0).length >= 1) {
  2206.             for (const addedNode of mutation.addedNodes) {
  2207.               if (addedNode.nodeName === 'STYLE') {
  2208.                 clearContentVisibilitySizing();
  2209.                 return;
  2210.               }
  2211.             }
  2212.           }
  2213.           if ((mutation.removedNodes || 0).length >= 1) {
  2214.             for (const removedNode of mutation.removedNodes) {
  2215.               if (removedNode.nodeName === 'STYLE') {
  2216.                 clearContentVisibilitySizing();
  2217.                 return;
  2218.               }
  2219.             }
  2220.           }
  2221.         }
  2222.       });
  2223.  
  2224.       mutObserver.observe(document.documentElement, {
  2225.         childList: true,
  2226.         subtree: false
  2227.       });
  2228.       mutObserver.observe(document.head, {
  2229.         childList: true,
  2230.         subtree: false
  2231.       });
  2232.       mutObserver.observe(document.body, {
  2233.         childList: true,
  2234.         subtree: false
  2235.       });
  2236.  
  2237.     }
  2238.  
  2239.  
  2240.     class WillChangeController {
  2241.       constructor(itemScroller, willChangeValue) {
  2242.         this.element = itemScroller;
  2243.         this.counter = 0;
  2244.         this.active = false;
  2245.         this.willChangeValue = willChangeValue;
  2246.       }
  2247.  
  2248.       beforeOper() {
  2249.         if (!this.active) {
  2250.           this.active = true;
  2251.           this.element.style.willChange = this.willChangeValue;
  2252.         }
  2253.         this.counter++;
  2254.       }
  2255.  
  2256.       afterOper() {
  2257.         const c = this.counter;
  2258.         requestAnimationFrame(() => {
  2259.           if (c === this.counter) {
  2260.             this.active = false;
  2261.             this.element.style.willChange = '';
  2262.           }
  2263.         });
  2264.       }
  2265.  
  2266.       release() {
  2267.         const element = this.element;
  2268.         this.element = null;
  2269.         this.counter = 1e16;
  2270.         this.active = false;
  2271.         try {
  2272.           element.style.willChange = '';
  2273.         } catch (e) { }
  2274.       }
  2275.  
  2276.     }
  2277.  
  2278.  
  2279.     const skzData = (skz) => skz.data = {
  2280.       "message": {
  2281.         "runs": [
  2282.           {
  2283.             "text": "em2o"
  2284.           },
  2285.           {
  2286.             "emoji": {
  2287.               "emojiId": "cm35z",
  2288.               "shortcuts": [
  2289.                 ":_s:",
  2290.                 ":s:"
  2291.               ],
  2292.               "searchTerms": [
  2293.                 "_s",
  2294.                 "s"
  2295.               ],
  2296.               "image": {
  2297.                 "thumbnails": [
  2298.                   {
  2299.                     "url": dummyImgURL,
  2300.                     "width": 48,
  2301.                     "height": 48
  2302.                   }
  2303.                 ],
  2304.                 "accessibility": {
  2305.                   "accessibilityData": {
  2306.                     "label": "s"
  2307.                   }
  2308.                 }
  2309.               },
  2310.               "isCustomEmoji": true
  2311.             }
  2312.           },
  2313.           {
  2314.             "text": "ji"
  2315.           }
  2316.         ]
  2317.       },
  2318.       "authorName": {
  2319.         "simpleText": "N"
  2320.       },
  2321.       "authorPhoto": {
  2322.         "thumbnails": [
  2323.           {
  2324.             "url": dummyImgURL,
  2325.             "width": 64,
  2326.             "height": 64
  2327.           }
  2328.         ]
  2329.       },
  2330.       "contextMenuEndpoint": {
  2331.         "commandMetadata": {
  2332.           "webCommandMetadata": {
  2333.             "ignoreNavigation": true
  2334.           }
  2335.         },
  2336.         "liveChatItemContextMenuEndpoint": {
  2337.           "params": "123=="
  2338.         }
  2339.       },
  2340.       "id": "sk35z",
  2341.       "timestampUsec": "1232302352350000",
  2342.       "authorBadges": [
  2343.         {
  2344.           "liveChatAuthorBadgeRenderer": {
  2345.             "customThumbnail": {
  2346.               "thumbnails": [
  2347.                 {
  2348.                   "url": dummyImgURL,
  2349.                   "width": 16,
  2350.                   "height": 16
  2351.                 },
  2352.                 {
  2353.                   "url": dummyImgURL,
  2354.                   "width": 32,
  2355.                   "height": 32
  2356.                 }
  2357.               ]
  2358.             },
  2359.             "tooltip": "T",
  2360.             "accessibility": {
  2361.               "accessibilityData": {
  2362.                 "label": "E"
  2363.               }
  2364.             }
  2365.           }
  2366.         }
  2367.       ],
  2368.       "authorExternalChannelId": "A",
  2369.       "contextMenuAccessibility": {
  2370.         "accessibilityData": {
  2371.           "label": "E"
  2372.         }
  2373.       },
  2374.       "timestampText": {
  2375.         "simpleText": "0:43"
  2376.       }
  2377.     };
  2378.  
  2379.  
  2380.  
  2381.     const { lcRendererElm, visObserver } = (() => {
  2382.  
  2383.  
  2384.  
  2385.       let lcRendererWR = null;
  2386.  
  2387.       const lcRendererElm = () => {
  2388.         let lcRenderer = kRef(lcRendererWR);
  2389.         if (!lcRenderer || !lcRenderer.isConnected) {
  2390.           lcRenderer = document.querySelector('yt-live-chat-item-list-renderer.yt-live-chat-renderer');
  2391.           lcRendererWR = lcRenderer ? mWeakRef(lcRenderer) : null;
  2392.         }
  2393.         return lcRenderer;
  2394.       };
  2395.  
  2396.  
  2397.       let hasFirstShowMore = false;
  2398.  
  2399.       const visObserverFn = (entry) => {
  2400.  
  2401.         const target = entry.target;
  2402.         if (!target) return;
  2403.         // if(target.classList.contains('dont-render')) return;
  2404.         let isVisible = entry.isIntersecting === true && entry.intersectionRatio > 0.5;
  2405.         // const h = entry.boundingClientRect.height;
  2406.         /*
  2407.         if (h < 16) { // wrong: 8 (padding/margin); standard: 32; test: 16 or 20
  2408.             // e.g. under fullscreen. the element created but not rendered.
  2409.             target.setAttribute('wSr93', '');
  2410.             return;
  2411.         }
  2412.         */
  2413.         if (isVisible) {
  2414.           // target.style.setProperty('--wsr94', h + 'px');
  2415.           target.setAttribute('wSr93', 'visible');
  2416.           if (nNextElem(target) === null) {
  2417.  
  2418.             // firstVisibleItemDetected = true;
  2419.             /*
  2420.               if (dateNow() - lastScroll < 80) {
  2421.                   lastLShow = 0;
  2422.                   lastScroll = 0;
  2423.                   Promise.resolve().then(clickShowMore);
  2424.               } else {
  2425.                   lastLShow = dateNow();
  2426.               }
  2427.               */
  2428.             // lastLShow = dateNow();
  2429.           } else if (!hasFirstShowMore) { // should more than one item being visible
  2430.             // implement inside visObserver to ensure there is sufficient delay
  2431.             hasFirstShowMore = true;
  2432.             requestAnimationFrame(() => {
  2433.               // foreground page
  2434.               // page visibly ready -> load the latest comments at initial loading
  2435.               const lcRenderer = lcRendererElm();
  2436.               if (lcRenderer) {
  2437.                 (lcRenderer.inst || lcRenderer).scrollToBottom_();
  2438.               }
  2439.             });
  2440.           }
  2441.         }
  2442.         else if (target.getAttribute('wSr93') === 'visible') { // ignore target.getAttribute('wSr93') === '' to avoid wrong sizing
  2443.  
  2444.           // target.style.setProperty('--wsr94', h + 'px');
  2445.           target.setAttribute('wSr93', 'hidden');
  2446.         } // note: might consider 0 < entry.intersectionRatio < 0.5 and target.getAttribute('wSr93') === '' <new last item>
  2447.  
  2448.       }
  2449.  
  2450.  
  2451.  
  2452.       const visObserver = new IntersectionObserver((entries) => {
  2453.  
  2454.         for (const entry of entries) {
  2455.  
  2456.           Promise.resolve(entry).then(visObserverFn);
  2457.  
  2458.         }
  2459.  
  2460.       }, {
  2461.         // root: HTMLElement.prototype.closest.call(m2, '#item-scroller.yt-live-chat-item-list-renderer'), // nullable
  2462.         rootMargin: "0px",
  2463.         threshold: [0.05, 0.95],
  2464.       });
  2465.  
  2466.  
  2467.       return { lcRendererElm, visObserver }
  2468.  
  2469.  
  2470.     })();
  2471.  
  2472.     const { setupMutObserver } = (() => {
  2473.  
  2474.       const mutFn = (items) => {
  2475.         for (let node = nLastElem(items); node !== null; node = nPrevElem(node)) {
  2476.           if (node.hasAttribute('wSr93')) break;
  2477.           node.setAttribute('wSr93', '');
  2478.           visObserver.observe(node);
  2479.         }
  2480.       }
  2481.  
  2482.       const mutObserver = new MutationObserver((mutations) => {
  2483.         const items = (mutations[0] || 0).target;
  2484.         if (!items) return;
  2485.         if (sk35zResolveFn) {
  2486.           sk35zResolveFn();
  2487.           sk35zResolveFn = null;
  2488.         }
  2489.         mutFn(items);
  2490.       });
  2491.  
  2492.       const setupMutObserver = (m2) => {
  2493.         scrollChatFn = null;
  2494.         mutObserver.disconnect();
  2495.         mutObserver.takeRecords();
  2496.         if (m2) {
  2497.           ENABLE_DELAYED_CHAT_OCCURRENCE && bnForDelayChatOccurrence();
  2498.           if (typeof m2.__appendChild932__ === 'function') {
  2499.             if (typeof m2.appendChild === 'function') m2.appendChild = m2.__appendChild932__;
  2500.             if (typeof m2.__shady_native_appendChild === 'function') m2.__shady_native_appendChild = m2.__appendChild932__;
  2501.           }
  2502.           mutObserver.observe(m2, {
  2503.             childList: true,
  2504.             subtree: false
  2505.           });
  2506.           mutFn(m2);
  2507.  
  2508.           const isFirstList = firstList;
  2509.           firstList = false;
  2510.  
  2511.           if (ENABLE_OVERFLOW_ANCHOR) {
  2512.  
  2513.             let items = m2;
  2514.             let addedAnchor = false;
  2515.             if (items) {
  2516.               if (items.nextElementSibling === null) {
  2517.                 items.classList.add('no-anchor');
  2518.                 addedAnchor = true;
  2519.                 items.parentNode.appendChild(dr(document.createElement('item-anchor')));
  2520.               }
  2521.             }
  2522.  
  2523.  
  2524.  
  2525.             if (addedAnchor) {
  2526.               nodeParent(m2).classList.add('no-anchor'); // required
  2527.             }
  2528.  
  2529.           }
  2530.  
  2531.           // let div = document.createElement('div');
  2532.           // div.id = 'qwcc';
  2533.           // HTMLElement.prototype.appendChild.call(document.querySelector('yt-live-chat-item-list-renderer'), div )
  2534.           // bufferRegion =div;
  2535.  
  2536.           // buffObserver.takeRecords();
  2537.           // buffObserver.disconnect();
  2538.           // buffObserver.observe(div,  {
  2539.           //     childList: true,
  2540.           //     subtree: false
  2541.           // })
  2542.  
  2543.           if (ENABLE_DELAYED_CHAT_OCCURRENCE && isFirstList) {
  2544.  
  2545.             promiseForCustomYtElementsReady.then(() => {
  2546.  
  2547.               customElements.whenDefined('yt-live-chat-text-message-renderer').then(() => {
  2548.  
  2549.  
  2550.  
  2551.  
  2552.                 setTimeout(() => {
  2553.  
  2554.                   /** @type {HTMLTemplateElement} */
  2555.                   let skz = document.createElement('yt-live-chat-text-message-renderer');
  2556.  
  2557.                   let cz1 = null;
  2558.  
  2559.                   if (skz && 'data' in skz && 'attached' in skz) {
  2560.  
  2561.                     const deferredZy1 = new Promise(resolve => {
  2562.  
  2563.                       skz.attached = function () {
  2564.                         cz1 = HTMLElement.prototype.querySelector.call(skz, '#message img') !== null;
  2565.                         resolve(skz.textContent);
  2566.                       }
  2567.                       skz.detached = function () {
  2568.  
  2569.                       }
  2570.  
  2571.                     });
  2572.                     skz.id = 'sk35z';
  2573.                     skzData(skz);
  2574.  
  2575.  
  2576.                     sk35zResolveFn = null;
  2577.                     const deferredMutation = new Promise(resolve => {
  2578.                       sk35zResolveFn = resolve;
  2579.                       HTMLElement.prototype.appendChild.call(m2, skz);
  2580.                     });
  2581.  
  2582.                     Promise.all([deferredZy1, deferredMutation]).then(async (res) => {
  2583.                       const [zy1, _] = res;
  2584.                       function fn() {
  2585.                         const zy2 = skz.textContent;
  2586.                         const cz2 = HTMLElement.prototype.querySelector.call(skz, '#message img') !== null;
  2587.                         if (typeof zy1 === 'string' && typeof zy2 === 'string') {
  2588.                           allowDontRender = zy1 === zy2 && cz1 === cz2; // '0:43N​em2oji'
  2589.                         }
  2590.                         if (allowDontRender === false) {
  2591.  
  2592.                           console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | Incompatibility Found"}`,
  2593.                             "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
  2594.                             "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
  2595.                           );
  2596.  
  2597.                           console.warn(`%cWarning:\n\tYou might have added a userscript or extension that stops YouTube Super Fast Chat's quick loading.\n\tTo figure out which one affects the script, turn them off one by one and let the author know.`, 'color: #bada55');
  2598.  
  2599.                           console.groupEnd();
  2600.                         } else if (allowDontRender === true) {
  2601.                           return true;
  2602.                         }
  2603.                       }
  2604.                       await new Promise(r => setTimeout(r, 1));
  2605.                       if (fn()) {
  2606.                         await new Promise(r => requestAnimationFrame(r));
  2607.                         if (fn()) {
  2608.                           skz.remove();
  2609.                           skz.textContent = '';
  2610.                           console.log('%cALLOW_DELAYED_CHAT_OCCURRENCE', 'background-color: #16c450; color: #102624; padding: 2px 4px');
  2611.                         }
  2612.                       }
  2613.                     });
  2614.  
  2615.                   }
  2616.  
  2617.                 }, 1);
  2618.  
  2619.               }).catch(console.warn);
  2620.  
  2621.             })
  2622.  
  2623.           }
  2624.  
  2625.  
  2626.           if (ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX) {
  2627.  
  2628.             (() => {
  2629.  
  2630.               const tag = 'yt-iframed-player-events-relay'
  2631.               const dummy = document.createElement(tag);
  2632.  
  2633.               const cProto = getProto(dummy);
  2634.               if (!cProto || !cProto.handlePostMessage_) {
  2635.                 console.warn(`proto.handlePostMessage_ for ${tag} is unavailable.`);
  2636.                 return;
  2637.               }
  2638.  
  2639.               if (typeof cProto.handlePostMessage_ === 'function' && !cProto.handlePostMessage66_) {
  2640.  
  2641.                 cProto.handlePostMessage66_ = cProto.handlePostMessage_;
  2642.  
  2643.                 cProto.handlePostMessage_ = function (a) {
  2644.  
  2645.                   const da = (a || 0).data || 0;
  2646.                   if (typeof da === 'object') {
  2647.  
  2648.                     // console.log('handlePostMessage_', da)
  2649.                     const qc = da['yt-player-state-change'];
  2650.                     if (qc === 3) { // pause
  2651.                       pairForPauseResume++;
  2652.                       pairForPauseResumeM++;
  2653.                     } else if (qc === 1) { // pause
  2654.                       pairForPauseResume++;
  2655.                       pairForPauseResumeM++;
  2656.                     } else if (qc === 2) {
  2657.                       pairForPauseResume++;
  2658.                       pairForPauseResumeM++;
  2659.                     }
  2660.                     if (pairForPauseResume > 1e9) pairForPauseResume = pairForPauseResume % 1e4;
  2661.                     if (pairForPauseResumeM > 1e9) pairForPauseResumeM = pairForPauseResumeM % 1e4;
  2662.                     return this.handlePostMessage66_(a);
  2663.  
  2664.                   }
  2665.  
  2666.  
  2667.                 }
  2668.  
  2669.               }
  2670.  
  2671.  
  2672.             })();
  2673.  
  2674.           }
  2675.  
  2676.           if (isFirstList && DO_CHECK_TICKER_BACKGROUND_OVERRIDED) {
  2677.             setTimeout(() => {
  2678.               if (!hasTimerModified) return;
  2679.               const tickerRenderer = document.querySelector('#ticker yt-live-chat-ticker-renderer.style-scope.yt-live-chat-renderer');
  2680.               if (!tickerRenderer) return;
  2681.  
  2682.               const items = (tickerRenderer.$ || 0).items || 0;
  2683.               if (!items) return;
  2684.               const template = document.createElement('template');
  2685.               template.innerHTML = `<yt-live-chat-ticker-dummy777-item-renderer class="style-scope yt-live-chat-ticker-renderer" whole-message-clickable=""
  2686.                 modern="" aria-label="¥1,000" role="button" tabindex="0" id="Chw777" style="width: 94px; overflow: hidden;"
  2687.                 dimmed="" [dummy777]>
  2688.                 <div id="container" dir="ltr" class="style-scope yt-live-chat-ticker-dummy777-item-renderer"
  2689.                   style="--background:linear-gradient(90deg, rgba(1,2,3,1),rgba(1,2,3,1) 7%,rgba(4,0,0,1) 7%,rgba(4,0,0,1));">
  2690.                   <div id="content" class="style-scope yt-live-chat-ticker-dummy777-item-renderer" style="color: rgb(255, 255, 255);">
  2691.                     <yt-img-shadow777 id="author-photo" height="24" width="24"
  2692.                       class="style-scope yt-live-chat-ticker-dummy777-item-renderer no-transition"
  2693.                       style="background-color: transparent;" loaded=""><img id="img"
  2694.                         draggable="false" class="style-scope yt-img-shadow" alt="I" height="24" width="24"
  2695.                         src="${dummyImgURL}"></yt-img-shadow777>
  2696.  
  2697.                     <span id="text" dir="ltr" class="style-scope yt-live-chat-ticker-dummy777-item-renderer">¥1,000</span>
  2698.                   </div>
  2699.                 </div>
  2700.               </yt-live-chat-ticker-dummy777-item-renderer>`;
  2701.               const dummy777 = template.content.firstElementChild;
  2702.               items.appendChild(dummy777);
  2703.               Promise.resolve(dummy777).then((dummy777) => {
  2704.                 let container = HTMLElement.prototype.querySelector.call(dummy777, '#container') || 0;
  2705.                 if (container.isConnected === true) {
  2706.  
  2707.                   const evaluated = `${window.getComputedStyle(container).background}`;
  2708.  
  2709.                   container = null;
  2710.                   dummy777.remove();
  2711.                   dummy777.textContent = '';
  2712.                   dummy777 = null;
  2713.  
  2714.                   if (evaluated.indexOf('0.') < 4) {
  2715.  
  2716.                     // not fulfilling
  2717.                     // rgba(0, 0, 0, 0.004) none repeat scroll 0% 0% / auto padding-box border-box
  2718.  
  2719.                     console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | Incompatibility Found"}`,
  2720.                       "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
  2721.                       "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
  2722.                     );
  2723.                     console.warn(`%cWarning:\n\tYou might have added a userscript or extension that also modifies the ticker background.\n\tYouTube Super Fast Chat is taking over.`, 'color: #bada55');
  2724.                     console.groupEnd();
  2725.  
  2726.                     console.log('%cALLOW_ADVANCED_ANIMATED_TICKER_BACKGROUND (Overriding other scripting)', 'background-color: #7eb32b; color: #102624; padding: 2px 4px');
  2727.  
  2728.                   } else {
  2729.  
  2730.                     console.log('%cALLOW_ADVANCED_ANIMATED_TICKER_BACKGROUND', 'background-color: #16c450; color: #102624; padding: 2px 4px');
  2731.                   }
  2732.                 }
  2733.               });
  2734.  
  2735.             }, 800);
  2736.           }
  2737.  
  2738.         }
  2739.       }
  2740.  
  2741.       return { setupMutObserver };
  2742.  
  2743.  
  2744.  
  2745.     })();
  2746.  
  2747.     const setupEvents = () => {
  2748.  
  2749.  
  2750.       let scrollCount = 0;
  2751.  
  2752.       const passiveCapture = typeof IntersectionObserver === 'function' ? { capture: true, passive: true } : true;
  2753.  
  2754.  
  2755.       const delayFlushActiveItemsAfterUserActionK_ = () => {
  2756.  
  2757.         const lcRenderer = lcRendererElm();
  2758.         if (lcRenderer) {
  2759.           const cnt = (lcRenderer.inst || lcRenderer);
  2760.           if (!cnt.hasUserJustInteracted11_) return;
  2761.           if (cnt.atBottom && cnt.allowScroll && cnt.activeItems_.length >= 1 && cnt.hasUserJustInteracted11_()) {
  2762.             cnt.delayFlushActiveItemsAfterUserAction11_ && cnt.delayFlushActiveItemsAfterUserAction11_();
  2763.           }
  2764.         }
  2765.  
  2766.       }
  2767.  
  2768.       document.addEventListener('scroll', (evt) => {
  2769.         if (!evt || !evt.isTrusted) return;
  2770.         // lastScroll = dateNow();
  2771.         if (++scrollCount > 1e9) scrollCount = 9;
  2772.       }, passiveCapture); // support contain => support passive
  2773.  
  2774.       let lastScrollCount = -1;
  2775.       document.addEventListener('wheel', (evt) => {
  2776.         if (!evt || !evt.isTrusted) return;
  2777.         if (lastScrollCount === scrollCount) return;
  2778.         lastScrollCount = scrollCount;
  2779.         lastWheel = dateNow();
  2780.         delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2781.       }, passiveCapture); // support contain => support passive
  2782.  
  2783.       document.addEventListener('mousedown', (evt) => {
  2784.         if (!evt || !evt.isTrusted) return;
  2785.         if (((evt || 0).target || 0).id !== 'item-scroller') return;
  2786.         lastMouseDown = dateNow();
  2787.         currentMouseDown = true;
  2788.         lastUserInteraction = lastMouseDown;
  2789.       }, passiveCapture);
  2790.  
  2791.       document.addEventListener('pointerdown', (evt) => {
  2792.         if (!evt || !evt.isTrusted) return;
  2793.         if (((evt || 0).target || 0).id !== 'item-scroller') return;
  2794.         lastMouseDown = dateNow();
  2795.         currentMouseDown = true;
  2796.         lastUserInteraction = lastMouseDown;
  2797.       }, passiveCapture);
  2798.  
  2799.       document.addEventListener('click', (evt) => {
  2800.         if (!evt || !evt.isTrusted) return;
  2801.         if (((evt || 0).target || 0).id !== 'item-scroller') return;
  2802.         lastMouseDown = lastMouseUp = dateNow();
  2803.         currentMouseDown = false;
  2804.         lastUserInteraction = lastMouseDown;
  2805.         delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2806.       }, passiveCapture);
  2807.  
  2808.       document.addEventListener('tap', (evt) => {
  2809.         if (!evt || !evt.isTrusted) return;
  2810.         if (((evt || 0).target || 0).id !== 'item-scroller') return;
  2811.         lastMouseDown = lastMouseUp = dateNow();
  2812.         currentMouseDown = false;
  2813.         lastUserInteraction = lastMouseDown;
  2814.         delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2815.       }, passiveCapture);
  2816.  
  2817.  
  2818.       document.addEventListener('mouseup', (evt) => {
  2819.         if (!evt || !evt.isTrusted) return;
  2820.         if (currentMouseDown) {
  2821.           lastMouseUp = dateNow();
  2822.           currentMouseDown = false;
  2823.           lastUserInteraction = lastMouseUp;
  2824.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2825.         }
  2826.       }, passiveCapture);
  2827.  
  2828.  
  2829.       document.addEventListener('pointerup', (evt) => {
  2830.         if (!evt || !evt.isTrusted) return;
  2831.         if (currentMouseDown) {
  2832.           lastMouseUp = dateNow();
  2833.           currentMouseDown = false;
  2834.           lastUserInteraction = lastMouseUp;
  2835.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2836.         }
  2837.       }, passiveCapture);
  2838.  
  2839.       document.addEventListener('touchstart', (evt) => {
  2840.         if (!evt || !evt.isTrusted) return;
  2841.         lastTouchDown = dateNow();
  2842.         currentTouchDown = true;
  2843.         lastUserInteraction = lastTouchDown;
  2844.       }, passiveCapture);
  2845.  
  2846.       document.addEventListener('touchmove', (evt) => {
  2847.         if (!evt || !evt.isTrusted) return;
  2848.         lastTouchDown = dateNow();
  2849.         currentTouchDown = true;
  2850.         lastUserInteraction = lastTouchDown;
  2851.       }, passiveCapture);
  2852.  
  2853.       document.addEventListener('touchend', (evt) => {
  2854.         if (!evt || !evt.isTrusted) return;
  2855.         if (currentTouchDown) {
  2856.           lastTouchUp = dateNow();
  2857.           currentTouchDown = false;
  2858.           lastUserInteraction = lastTouchUp;
  2859.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2860.         }
  2861.       }, passiveCapture);
  2862.  
  2863.       document.addEventListener('touchcancel', (evt) => {
  2864.         if (!evt || !evt.isTrusted) return;
  2865.         if (currentTouchDown) {
  2866.           lastTouchUp = dateNow();
  2867.           currentTouchDown = false;
  2868.           lastUserInteraction = lastTouchUp;
  2869.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2870.         }
  2871.       }, passiveCapture);
  2872.  
  2873.  
  2874.     }
  2875.  
  2876.  
  2877.     const onRegistryReadyForDOMOperations = () => {
  2878.  
  2879.       let firstCheckedOnYtInit = false;
  2880.  
  2881.       const assertorURL = () => assertor(() => location.pathname.startsWith('/live_chat') && (location.search.indexOf('continuation=') > 0 || location.search.indexOf('v=') > 0));
  2882.  
  2883.       const mightFirstCheckOnYtInit = () => {
  2884.         if (firstCheckedOnYtInit) return;
  2885.         firstCheckedOnYtInit = true;
  2886.  
  2887.         if (!document.body || !document.head) return;
  2888.         if (!assertorURL()) return;
  2889.  
  2890.         addCssManaged();
  2891.  
  2892.         let efsContainer = document.getElementById('elzm-fonts-yk75g');
  2893.         if (efsContainer && efsContainer.parentNode !== document.body) {
  2894.           document.body.appendChild(efsContainer);
  2895.         }
  2896.  
  2897.       };
  2898.  
  2899.       if (!assertorURL()) return;
  2900.       // if (!assertor(() => document.getElementById('yt-masthead') === null)) return;
  2901.  
  2902.       if (document.documentElement && document.head) {
  2903.         addCssManaged();
  2904.       }
  2905.       // console.log(document.body===null)
  2906.  
  2907.       customElements.whenDefined('yt-live-chat-item-list-renderer').then(() => {
  2908.  
  2909.         const tag = "yt-live-chat-item-list-renderer"
  2910.         const dummy = document.createElement(tag);
  2911.  
  2912.         const cProto = getProto(dummy);
  2913.         if (!cProto || !cProto.attached) {
  2914.           console.warn(`proto.attached for ${tag} is unavailable.`);
  2915.           return;
  2916.         }
  2917.  
  2918.         mightFirstCheckOnYtInit();
  2919.         groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-item-list-renderer hacks");
  2920.         console.log("[Begin]");
  2921.  
  2922.         const mclp = cProto;
  2923.         try {
  2924.           assertor(() => typeof mclp.scrollToBottom_ === 'function');
  2925.           assertor(() => typeof mclp.flushActiveItems_ === 'function');
  2926.           assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  2927.           assertor(() => typeof mclp.setAtBottom === 'function');
  2928.           assertor(() => typeof mclp.scrollToBottom66_ === 'undefined');
  2929.           assertor(() => typeof mclp.flushActiveItems66_ === 'undefined');
  2930.         } catch (e) { }
  2931.  
  2932.  
  2933.         try {
  2934.           assertor(() => typeof mclp.attached === 'function');
  2935.           assertor(() => typeof mclp.detached === 'function');
  2936.           assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  2937.           assertor(() => typeof mclp.isSmoothScrollEnabled_ === 'function');
  2938.           assertor(() => typeof mclp.maybeResizeScrollContainer_ === 'function');
  2939.           assertor(() => typeof mclp.refreshOffsetContainerHeight_ === 'function');
  2940.           assertor(() => typeof mclp.smoothScroll_ === 'function');
  2941.           assertor(() => typeof mclp.resetSmoothScroll_ === 'function');
  2942.         } catch (e) { }
  2943.  
  2944.         mclp.__intermediate_delay__ = null;
  2945.  
  2946.         let mzk = 0;
  2947.         let myk = 0;
  2948.         let mlf = 0;
  2949.         let myw = 0;
  2950.         let mzt = 0;
  2951.         let zarr = null;
  2952.         let mlg = 0;
  2953.  
  2954.         if ((mclp.clearList || 0).length === 0) {
  2955.           assertor(() => fnIntegrity(mclp.clearList, '0.106.50'));
  2956.           mclp.clearList66 = mclp.clearList;
  2957.           mclp.clearList = function () {
  2958.             mzk++;
  2959.             myk++;
  2960.             mlf++;
  2961.             myw++;
  2962.             mzt++;
  2963.             mlg++;
  2964.             zarr = null;
  2965.             this.__intermediate_delay__ = null;
  2966.             this.clearList66();
  2967.           };
  2968.           console.log("clearList", "OK");
  2969.         } else {
  2970.           console.log("clearList", "NG");
  2971.         }
  2972.  
  2973.  
  2974.         let onListRendererAttachedDone = false;
  2975.  
  2976.         function setList(itemOffset, items) {
  2977.  
  2978.           const isFirstTime = onListRendererAttachedDone === false;
  2979.  
  2980.           if (isFirstTime) {
  2981.             onListRendererAttachedDone = true;
  2982.             Promise.resolve().then(watchUserCSS);
  2983.             addCssManaged();
  2984.             setupEvents();
  2985.           }
  2986.  
  2987.           setupStyle(itemOffset, items);
  2988.  
  2989.           setupMutObserver(items);
  2990.         }
  2991.  
  2992.         mclp.attached419 = async function () {
  2993.  
  2994.           if (!this.isAttached) return;
  2995.  
  2996.           let maxTrial = 16;
  2997.           while (!this.$ || !this.$['item-scroller'] || !this.$['item-offset'] || !this.$['items']) {
  2998.             if (--maxTrial < 0 || !this.isAttached) return;
  2999.             await new Promise(requestAnimationFrame);
  3000.           }
  3001.  
  3002.           if (this.isAttached !== true) return;
  3003.  
  3004.           if (!this.$) {
  3005.             console.warn("!this.$");
  3006.             return;
  3007.           }
  3008.           if (!this.$) return;
  3009.           /** @type {HTMLElement | null} */
  3010.           const itemScroller = this.$['item-scroller'];
  3011.           /** @type {HTMLElement | null} */
  3012.           const itemOffset = this.$['item-offset'];
  3013.           /** @type {HTMLElement | null} */
  3014.           const items = this.$['items'];
  3015.  
  3016.           if (!itemScroller || !itemOffset || !items) {
  3017.             console.warn("items.parentNode !== itemOffset");
  3018.             return;
  3019.           }
  3020.  
  3021.           if (nodeParent(items) !== itemOffset) {
  3022.  
  3023.             console.warn("items.parentNode !== itemOffset");
  3024.             return;
  3025.           }
  3026.  
  3027.  
  3028.           if (items.id !== 'items' || itemOffset.id !== "item-offset") {
  3029.  
  3030.             console.warn("id incorrect");
  3031.             return;
  3032.           }
  3033.  
  3034.           const isTargetItems = HTMLElement.prototype.matches.call(items, '#item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer')
  3035.  
  3036.           if (!isTargetItems) {
  3037.             console.warn("!isTargetItems");
  3038.             return;
  3039.           }
  3040.  
  3041.           setList(itemOffset, items);
  3042.  
  3043.         }
  3044.  
  3045.         mclp.attached331 = mclp.attached;
  3046.         mclp.attached = function () {
  3047.           this.attached419 && this.attached419();
  3048.           return this.attached331();
  3049.         }
  3050.  
  3051.         mclp.detached331 = mclp.detached;
  3052.  
  3053.         mclp.detached = function () {
  3054.           setupMutObserver();
  3055.           return this.detached331();
  3056.         }
  3057.  
  3058.         const t29s = document.querySelectorAll("yt-live-chat-item-list-renderer");
  3059.         for (const t29 of t29s) {
  3060.           if ((t29.inst || t29).isAttached === true) {
  3061.             t29.attached419();
  3062.           }
  3063.         }
  3064.  
  3065.         if ((mclp.async || 0).length === 2 && (mclp.cancelAsync || 0).length === 1) {
  3066.  
  3067.           assertor(() => fnIntegrity(mclp.async, '2.24.15'));
  3068.           assertor(() => fnIntegrity(mclp.cancelAsync, '1.15.8'));
  3069.  
  3070.           /** @type {Map<number, any>} */
  3071.           const aMap = new Map();
  3072.           let count = 6150;
  3073.           mclp.async66 = mclp.async;
  3074.           mclp.async = function (e, f) {
  3075.             // ensure the previous operation is done
  3076.             // .async is usually after the time consuming functions like flushActiveItems_ and scrollToBottom_
  3077.             const hasF = arguments.length === 2;
  3078.             const stack = new Error().stack;
  3079.             const isFlushAsync = stack.indexOf('flushActiveItems_') >= 0;
  3080.             if (count > 1e9) count = 6159;
  3081.             const resId = ++count;
  3082.             aMap.set(resId, e);
  3083.             (this.__intermediate_delay__ || Promise.resolve()).then(rk => {
  3084.               const rp = aMap.get(resId);
  3085.               if (typeof rp !== 'function') {
  3086.                 return;
  3087.               }
  3088.               let cancelCall = false;
  3089.               if (isFlushAsync) {
  3090.                 if (rk < 0) {
  3091.                   cancelCall = true;
  3092.                 } else if (rk === 2 && arguments[0] === this.maybeScrollToBottom_) {
  3093.                   cancelCall = true;
  3094.                 }
  3095.               }
  3096.               if (cancelCall) {
  3097.                 aMap.delete(resId);
  3098.               } else {
  3099.                 const asyncEn = function () {
  3100.                   aMap.delete(resId);
  3101.                   return rp.apply(this, arguments);
  3102.                 };
  3103.                 aMap.set(resId, hasF ? this.async66(asyncEn, f) : this.async66(asyncEn));
  3104.               }
  3105.             });
  3106.  
  3107.             return resId;
  3108.           }
  3109.  
  3110.           mclp.cancelAsync66 = mclp.cancelAsync;
  3111.           mclp.cancelAsync = function (resId) {
  3112.             if (resId <= 6150) {
  3113.               this.cancelAsync66(resId);
  3114.             } else if (aMap.has(resId)) {
  3115.               const rp = aMap.get(resId);
  3116.               aMap.delete(resId);
  3117.               if (typeof rp !== 'function') {
  3118.                 this.cancelAsync66(rp);
  3119.               }
  3120.             }
  3121.           }
  3122.  
  3123.           console.log("async", "OK");
  3124.         } else {
  3125.           console.log("async", "NG");
  3126.         }
  3127.  
  3128.  
  3129.         if ((mclp.showNewItems_ || 0).length === 0 && ENABLE_NO_SMOOTH_TRANSFORM) {
  3130.  
  3131.           assertor(() => fnIntegrity(mclp.showNewItems_, '0.170.79'));
  3132.           mclp.showNewItems66_ = mclp.showNewItems_;
  3133.  
  3134.           mclp.showNewItems77_ = async function () {
  3135.             if (myk > 1e9) myk = 9;
  3136.             let tid = ++myk;
  3137.  
  3138.             await new Promise(requestAnimationFrame);
  3139.  
  3140.             if (tid !== myk) {
  3141.               return;
  3142.             }
  3143.  
  3144.             const cnt = this;
  3145.  
  3146.             await Promise.resolve();
  3147.             cnt.showNewItems66_();
  3148.  
  3149.             await Promise.resolve();
  3150.  
  3151.           }
  3152.  
  3153.           mclp.showNewItems_ = function () {
  3154.  
  3155.             const cnt = this;
  3156.             cnt.__intermediate_delay__ = new Promise(resolve => {
  3157.               cnt.showNewItems77_().then(() => {
  3158.                 resolve();
  3159.               });
  3160.             });
  3161.           }
  3162.  
  3163.           console.log("showNewItems_", "OK");
  3164.         } else {
  3165.           console.log("showNewItems_", "NG");
  3166.         }
  3167.  
  3168.  
  3169.         if ((mclp.flushActiveItems_ || 0).length === 0) {
  3170.  
  3171.           assertor(() => fnIntegrity(mclp.flushActiveItems_, '0.137.81'));
  3172.  
  3173.           let hasMoreMessageState = !ENABLE_SHOW_MORE_BLINKER ? -1 : 0;
  3174.  
  3175.           let contensWillChangeController = null;
  3176.  
  3177.           mclp.flushActiveItems66_ = mclp.flushActiveItems_;
  3178.  
  3179.           mclp.flushActiveItems78_ = async function (tid) {
  3180.             try {
  3181.               if (tid !== mlf) return;
  3182.               const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  3183.               let logger = false;
  3184.               const cnt = this;
  3185.               let immd = cnt.__intermediate_delay__;
  3186.               await new Promise(requestAnimationFrame);
  3187.  
  3188.               if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  3189.               if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
  3190.  
  3191.               mlf++;
  3192.               if (mlg > 1e9) mlg = 9;
  3193.               ++mlg;
  3194.  
  3195.               const tmpMaxItemsCount = this.data.maxItemsToDisplay;
  3196.               const reducedMaxItemsToDisplay = MAX_ITEMS_FOR_FULL_FLUSH;
  3197.               let changeMaxItemsToDisplay = false;
  3198.               const activeItemsLen = this.activeItems_.length;
  3199.               if (activeItemsLen > tmpMaxItemsCount && tmpMaxItemsCount > 0) {
  3200.                 logger = true;
  3201.  
  3202.                 groupCollapsed("YouTube Super Fast Chat", " | flushActiveItems78_");
  3203.  
  3204.                 logger && console.log('[Begin]')
  3205.  
  3206.                 console.log('this.activeItems_.length > N', activeItemsLen, tmpMaxItemsCount);
  3207.                 if (ENABLE_REDUCED_MAXITEMS_FOR_FLUSH && lockedMaxItemsToDisplay === tmpMaxItemsCount && lockedMaxItemsToDisplay !== reducedMaxItemsToDisplay) {
  3208.                   console.log('reduce maxitems');
  3209.                   if (tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  3210.                     // as all the rendered chats are already "outdated"
  3211.                     // all old chats shall remove and reduced number of few chats will be rendered
  3212.                     // then restore to the original number
  3213.                     changeMaxItemsToDisplay = true;
  3214.                     this.data.maxItemsToDisplay = reducedMaxItemsToDisplay;
  3215.                     console.log(`'maxItemsToDisplay' is reduced from ${tmpMaxItemsCount} to ${reducedMaxItemsToDisplay}.`)
  3216.                   }
  3217.                   this.activeItems_.splice(0, activeItemsLen - this.data.maxItemsToDisplay);
  3218.                   //   console.log('changeMaxItemsToDisplay 01', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  3219.  
  3220.                   console.log('new this.activeItems_.length > N', this.activeItems_.length);
  3221.                 } else {
  3222.                   this.activeItems_.splice(0, activeItemsLen - (tmpMaxItemsCount < 900 ? tmpMaxItemsCount : 900));
  3223.  
  3224.                   console.log('new this.activeItems_.length > N', this.activeItems_.length);
  3225.                 }
  3226.               }
  3227.               // it is found that it will render all stacked chats after switching back from background
  3228.               // to avoid lagging in popular livestream with massive chats, trim first before rendering.
  3229.               // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
  3230.  
  3231.  
  3232.               const items = (cnt.$ || 0).items;
  3233.  
  3234.               if (USE_WILL_CHANGE_CONTROLLER) {
  3235.                 if (contensWillChangeController && contensWillChangeController.element !== items) {
  3236.                   contensWillChangeController.release();
  3237.                   contensWillChangeController = null;
  3238.                 }
  3239.                 if (!contensWillChangeController) contensWillChangeController = new WillChangeController(items, 'contents');
  3240.               }
  3241.               const wcController = contensWillChangeController;
  3242.               cnt.__intermediate_delay__ = Promise.all([cnt.__intermediate_delay__ || null, immd || null]);
  3243.               wcController && wcController.beforeOper();
  3244.               await Promise.resolve();
  3245.               const acItems = cnt.activeItems_;
  3246.               const len1 = acItems.length;
  3247.               if (!len1) console.warn('cnt.activeItems_.length = 0');
  3248.               let waitFor = [];
  3249.  
  3250.  
  3251.               /** @type {Set<string>} */
  3252.               const imageLinks = new Set();
  3253.  
  3254.               if (ENABLE_PRELOAD_THUMBNAIL || EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL) {
  3255.                 for (const item of acItems) {
  3256.                   fixLiveChatItem(item, imageLinks);
  3257.                 }
  3258.               }
  3259.               if (ENABLE_PRELOAD_THUMBNAIL && kptPF !== null && (kptPF & (8 | 4)) && imageLinks.size > 0) {
  3260.                 if (emojiPrefetched.size > PREFETCH_LIMITED_SIZE_EMOJI) emojiPrefetched.clear();
  3261.                 if (authorPhotoPrefetched.size > PREFETCH_LIMITED_SIZE_AUTHOR_PHOTO) authorPhotoPrefetched.clear();
  3262.  
  3263.                 // reference: https://github.com/Yuanfang-fe/Blog-X/issues/34
  3264.                 const rel = kptPF & 8 ? 'subresource' : kptPF & 16 ? 'preload' : kptPF & 4 ? 'prefetch' : '';
  3265.                 // preload performs the high priority fetching.
  3266.                 // prefetch delays the chat display if the video resoruce is demanding.
  3267.  
  3268.                 if (rel) {
  3269.  
  3270.                   imageLinks.forEach(imageLink => {
  3271.                     let d = false;
  3272.                     const isEmoji = imageLink.includes('/emoji/');
  3273.                     const pretechedSet = isEmoji ? emojiPrefetched : authorPhotoPrefetched;
  3274.                     if (!pretechedSet.has(imageLink)) {
  3275.                       pretechedSet.add(imageLink);
  3276.                       d = true;
  3277.                     }
  3278.                     if (d) {
  3279.                       waitFor.push(linker(null, rel, imageLink, 'image'));
  3280.  
  3281.                     }
  3282.                   })
  3283.  
  3284.                 }
  3285.  
  3286.               }
  3287.  
  3288.               skipDontRender = ((cnt.visibleItems || 0).length || 0) === 0;
  3289.               // console.log('ss1', Date.now())
  3290.               if (waitFor.length > 0) {
  3291.                 await Promise.race([new Promise(r => setTimeout(r, 250)), Promise.all(waitFor)]);
  3292.               }
  3293.               waitFor.length = 0;
  3294.               waitFor = null;
  3295.               // console.log('ss2', Date.now())
  3296.               cnt.flushActiveItems66_();
  3297.               skipDontRender = ((cnt.visibleItems || 0).length || 0) === 0;
  3298.               const len2 = cnt.activeItems_.length;
  3299.               const bAsync = len1 !== len2;
  3300.               await Promise.resolve();
  3301.               if (wcController) {
  3302.                 if (bAsync) {
  3303.                   cnt.async(() => {
  3304.                     wcController.afterOper();
  3305.                   });
  3306.                 } else {
  3307.                   wcController.afterOper();
  3308.                 }
  3309.               }
  3310.               if (changeMaxItemsToDisplay && this.data.maxItemsToDisplay === reducedMaxItemsToDisplay && tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  3311.                 this.data.maxItemsToDisplay = tmpMaxItemsCount;
  3312.  
  3313.                 logger && console.log(`'maxItemsToDisplay' is restored from ${reducedMaxItemsToDisplay} to ${tmpMaxItemsCount}.`);
  3314.                 //   console.log('changeMaxItemsToDisplay 02', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  3315.               } else if (changeMaxItemsToDisplay) {
  3316.  
  3317.                 logger && console.log(`'maxItemsToDisplay' cannot be restored`, {
  3318.                   maxItemsToDisplay: this.data.maxItemsToDisplay,
  3319.                   reducedMaxItemsToDisplay,
  3320.                   originalMaxItemsToDisplay: tmpMaxItemsCount
  3321.                 });
  3322.               }
  3323.               logger && console.log('[End]')
  3324.  
  3325.               logger && console.groupEnd();
  3326.  
  3327.               if (!ENABLE_NO_SMOOTH_TRANSFORM) {
  3328.  
  3329.  
  3330.                 const ff = () => {
  3331.  
  3332.                   if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  3333.                   //   if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  3334.                   if (!cnt.atBottom && cnt.allowScroll && cnt.hasUserJustInteracted11_ && !cnt.hasUserJustInteracted11_()) {
  3335.                     cnt.scrollToBottom_();
  3336.  
  3337.                     Promise.resolve().then(() => {
  3338.  
  3339.                       if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  3340.                       if (!cnt.canScrollToBottom_()) cnt.scrollToBottom_();
  3341.                     });
  3342.  
  3343.  
  3344.                   }
  3345.                 }
  3346.  
  3347.                 ff();
  3348.  
  3349.  
  3350.                 Promise.resolve().then(ff);
  3351.  
  3352.                 // requestAnimationFrame(ff);
  3353.               } else if (true) { // it might not be sticky to bottom when there is a full refresh.
  3354.  
  3355.                 const knt = cnt;
  3356.                 if (!scrollChatFn) {
  3357.                   const cnt = knt;
  3358.                   const f = () => {
  3359.                     const itemScroller = cnt.itemScroller;
  3360.                     if (!itemScroller || itemScroller.isConnected === false || cnt.isAttached === false) return;
  3361.                     if (!cnt.atBottom) {
  3362.                       cnt.scrollToBottom_();
  3363.                     } else if (itemScroller.scrollTop === 0) { // not yet interacted by user; cannot stick to bottom
  3364.                       itemScroller.scrollTop = itemScroller.scrollHeight;
  3365.                     }
  3366.                   };
  3367.                   scrollChatFn = () => Promise.resolve().then(f).then(f);
  3368.                 }
  3369.  
  3370.                 if (!ENABLE_DELAYED_CHAT_OCCURRENCE) scrollChatFn();
  3371.               }
  3372.  
  3373.               return 1;
  3374.  
  3375.  
  3376.             } catch (e) {
  3377.               console.warn(e);
  3378.             }
  3379.           }
  3380.  
  3381.           mclp.flushActiveItems77_ = function () {
  3382.  
  3383.             return new Promise(resResolve => {
  3384.               try {
  3385.                 const cnt = this;
  3386.                 if (mlf > 1e9) mlf = 9;
  3387.                 let tid = ++mlf;
  3388.                 const hostElement = cnt.hostElement || cnt;
  3389.                 if (tid !== mlf || cnt.isAttached === false || hostElement.isConnected === false) return resResolve();
  3390.                 if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return resResolve();
  3391.  
  3392.                 // 4 times to maxItems to avoid frequent trimming.
  3393.                 // 1 ... 10 ... 20 ... 30 ... 40 ... 50 ... 60 => 16 ... 20 ... 30 ..... 60 ... => 16
  3394.  
  3395.                 const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  3396.                 this.activeItems_.length > lockedMaxItemsToDisplay * 4 && lockedMaxItemsToDisplay > 4 && this.activeItems_.splice(0, this.activeItems_.length - lockedMaxItemsToDisplay - 1);
  3397.                 if (cnt.canScrollToBottom_()) {
  3398.                   cnt.mutexPromiseFA78 = (cnt.mutexPromiseFA78 || Promise.resolve())
  3399.                     .then(() => cnt.flushActiveItems78_(tid)) // async function
  3400.                     .then((asyncResult) => {
  3401.                       resResolve(asyncResult); // either undefined or 1
  3402.                       resResolve = null;
  3403.                     }).catch((e) => {
  3404.                       console.warn(e);
  3405.                       if (resResolve) resResolve();
  3406.                     });
  3407.                 } else {
  3408.                   resResolve(2);
  3409.                   resResolve = null;
  3410.                 }
  3411.               } catch (e) {
  3412.                 console.warn(e);
  3413.                 if (resResolve) resResolve();
  3414.               }
  3415.  
  3416.  
  3417.             });
  3418.  
  3419.           }
  3420.  
  3421.           mclp.flushActiveItems_ = function () {
  3422.             const cnt = this;
  3423.  
  3424.             if (arguments.length !== 0 || !cnt.activeItems_ || !cnt.canScrollToBottom_) return cnt.flushActiveItems66_.apply(this, arguments);
  3425.  
  3426.             if (cnt.activeItems_.length === 0) {
  3427.               cnt.__intermediate_delay__ = null;
  3428.               return;
  3429.             }
  3430.  
  3431.             const cntData = ((cnt || 0).data || 0);
  3432.             if (cntData.maxItemsToDisplay944 === undefined) {
  3433.               cntData.maxItemsToDisplay944 = null;
  3434.               if (cntData.maxItemsToDisplay > MAX_ITEMS_FOR_TOTAL_DISPLAY) cntData.maxItemsToDisplay = MAX_ITEMS_FOR_TOTAL_DISPLAY;
  3435.               cntData.maxItemsToDisplay944 = cntData.maxItemsToDisplay || null;
  3436.             }
  3437.  
  3438.             // ignore previous __intermediate_delay__ and create a new one
  3439.             cnt.__intermediate_delay__ = new Promise(resolve => {
  3440.               cnt.flushActiveItems77_().then(rt => {  // either undefined or 1 or 2
  3441.                 if (rt === 1) {
  3442.                   resolve(1); // success, scroll to bottom
  3443.                   if (hasMoreMessageState === 1) {
  3444.                     hasMoreMessageState = 0;
  3445.                     const showMore = (cnt.$ || 0)['show-more'];
  3446.                     if (showMore) {
  3447.                       showMore.classList.remove('has-new-messages-miuzp');
  3448.                     }
  3449.                   }
  3450.                 }
  3451.                 else if (rt === 2) {
  3452.                   resolve(2); // success, trim
  3453.                   if (hasMoreMessageState === 0) {
  3454.                     hasMoreMessageState = 1;
  3455.                     const showMore = cnt.$['show-more'];
  3456.                     if (showMore) {
  3457.                       showMore.classList.add('has-new-messages-miuzp');
  3458.                     }
  3459.                   }
  3460.                 }
  3461.                 else resolve(-1); // skip
  3462.               }).catch(e => {
  3463.                 console.warn(e);
  3464.               });
  3465.             });
  3466.  
  3467.           }
  3468.           console.log("flushActiveItems_", "OK");
  3469.         } else {
  3470.           console.log("flushActiveItems_", "NG");
  3471.         }
  3472.  
  3473.         mclp.delayFlushActiveItemsAfterUserAction11_ = async function () {
  3474.           try {
  3475.             if (mlg > 1e9) mlg = 9;
  3476.             const tid = ++mlg;
  3477.             const keepTrialCond = () => this.atBottom && this.allowScroll && (tid === mlg) && this.isAttached === true && this.activeItems_.length >= 1 && (this.hostElement || 0).isConnected === true;
  3478.             const runCond = () => this.canScrollToBottom_();
  3479.             if (!keepTrialCond()) return;
  3480.             if (runCond()) return this.flushActiveItems_() | 1; // avoid return promise
  3481.             await new Promise(r => setTimeout(r, 80));
  3482.             if (!keepTrialCond()) return;
  3483.             if (runCond()) return this.flushActiveItems_() | 1;
  3484.             await new Promise(requestAnimationFrame);
  3485.             if (runCond()) return this.flushActiveItems_() | 1;
  3486.           } catch (e) {
  3487.             console.warn(e);
  3488.           }
  3489.         }
  3490.  
  3491.         if ((mclp.atBottomChanged_ || 0).length === 1) {
  3492.           // note: if the scrolling is too frequent, the show more visibility might get wrong.
  3493.           assertor(() => fnIntegrity(mclp.atBottomChanged_, '1.75.39'));
  3494.  
  3495.           const querySelector = HTMLElement.prototype.querySelector;
  3496.           const U = (element) => ({
  3497.             querySelector: (selector) => querySelector.call(element, selector)
  3498.           });
  3499.  
  3500.           let qid = 0;
  3501.           mclp.atBottomChanged_ = function (a) {
  3502.             let tid = ++qid;
  3503.             let b = this;
  3504.             a ? this.hideShowMoreAsync_ || (this.hideShowMoreAsync_ = this.async(function () {
  3505.               if (tid !== qid) return;
  3506.               U(b.hostElement).querySelector("#show-more").style.visibility = "hidden"
  3507.             }, 200)) : (this.hideShowMoreAsync_ && this.cancelAsync(this.hideShowMoreAsync_),
  3508.               this.hideShowMoreAsync_ = null,
  3509.               U(this.hostElement).querySelector("#show-more").style.visibility = "visible")
  3510.           }
  3511.  
  3512.           console.log("atBottomChanged_", "OK");
  3513.         } else {
  3514.           console.log("atBottomChanged_", "NG");
  3515.         }
  3516.  
  3517.         if ((mclp.onScrollItems_ || 0).length === 1) {
  3518.  
  3519.           assertor(() => fnIntegrity(mclp.onScrollItems_, '1.17.9'));
  3520.           mclp.onScrollItems66_ = mclp.onScrollItems_;
  3521.           mclp.onScrollItems77_ = async function (evt) {
  3522.             if (myw > 1e9) myw = 9;
  3523.             let tid = ++myw;
  3524.  
  3525.             await new Promise(requestAnimationFrame);
  3526.  
  3527.             if (tid !== myw) {
  3528.               return;
  3529.             }
  3530.  
  3531.             const cnt = this;
  3532.  
  3533.             await Promise.resolve();
  3534.             if (USE_OPTIMIZED_ON_SCROLL_ITEMS) {
  3535.               await Promise.resolve().then(() => {
  3536.                 this.ytRendererBehavior.onScroll(evt);
  3537.               }).then(() => {
  3538.                 if (this.canScrollToBottom_()) {
  3539.                   const hasUserJustInteracted = this.hasUserJustInteracted11_ ? this.hasUserJustInteracted11_() : true;
  3540.                   if (hasUserJustInteracted) {
  3541.                     // only when there is an user action
  3542.                     this.setAtBottom();
  3543.                     return 1;
  3544.                   }
  3545.                 } else {
  3546.                   // no message inserting
  3547.                   this.setAtBottom();
  3548.                   return 1;
  3549.                 }
  3550.               }).then((r) => {
  3551.  
  3552.                 if (this.activeItems_.length) {
  3553.  
  3554.                   if (this.canScrollToBottom_()) {
  3555.                     this.flushActiveItems_();
  3556.                     return 1 && r;
  3557.                   } else if (this.atBottom && this.allowScroll && (this.hasUserJustInteracted11_ && this.hasUserJustInteracted11_())) {
  3558.                     // delayed due to user action
  3559.                     this.delayFlushActiveItemsAfterUserAction11_ && this.delayFlushActiveItemsAfterUserAction11_();
  3560.                     return 0;
  3561.                   }
  3562.                 }
  3563.               }).then((r) => {
  3564.                 if (r) {
  3565.                   // ensure setAtBottom is correctly set
  3566.                   this.setAtBottom();
  3567.                 }
  3568.               });
  3569.             } else {
  3570.               cnt.onScrollItems66_(evt);
  3571.             }
  3572.  
  3573.             await Promise.resolve();
  3574.  
  3575.           }
  3576.  
  3577.           mclp.onScrollItems_ = function (evt) {
  3578.  
  3579.             const cnt = this;
  3580.             cnt.__intermediate_delay__ = new Promise(resolve => {
  3581.               cnt.onScrollItems77_(evt).then(() => {
  3582.                 resolve();
  3583.               });
  3584.             });
  3585.           }
  3586.           console.log("onScrollItems_", "OK");
  3587.         } else {
  3588.           console.log("onScrollItems_", "NG");
  3589.         }
  3590.  
  3591.         if ((mclp.handleLiveChatActions_ || 0).length === 1) {
  3592.  
  3593.           assertor(() => fnIntegrity(mclp.handleLiveChatActions_, '1.31.17'));
  3594.           mclp.handleLiveChatActions66_ = mclp.handleLiveChatActions_;
  3595.  
  3596.           mclp.handleLiveChatActions77_ = async function (arr) {
  3597.             if (typeof (arr || 0).length !== 'number') {
  3598.               this.handleLiveChatActions66_(arr);
  3599.               return;
  3600.             }
  3601.             if (mzt > 1e9) mzt = 9;
  3602.             let tid = ++mzt;
  3603.  
  3604.             if (zarr === null) zarr = arr;
  3605.             else Array.prototype.push.apply(zarr, arr);
  3606.             arr = null;
  3607.  
  3608.             await new Promise(requestAnimationFrame);
  3609.  
  3610.             if (tid !== mzt || zarr === null) {
  3611.               return;
  3612.             }
  3613.  
  3614.             const carr = zarr;
  3615.             zarr = null;
  3616.  
  3617.             await Promise.resolve();
  3618.             this.handleLiveChatActions66_(carr);
  3619.             await Promise.resolve();
  3620.  
  3621.           }
  3622.  
  3623.           mclp.handleLiveChatActions_ = function (arr) {
  3624.  
  3625.             const cnt = this;
  3626.             cnt.__intermediate_delay__ = new Promise(resolve => {
  3627.               cnt.handleLiveChatActions77_(arr).then(() => {
  3628.                 resolve();
  3629.               });
  3630.             });
  3631.           }
  3632.           console.log("handleLiveChatActions_", "OK");
  3633.         } else {
  3634.           console.log("handleLiveChatActions_", "NG");
  3635.         }
  3636.  
  3637.         mclp.hasUserJustInteracted11_ = () => {
  3638.           const t = dateNow();
  3639.           return (t - lastWheel < 80) || currentMouseDown || currentTouchDown || (t - lastUserInteraction < 80);
  3640.         }
  3641.  
  3642.         if ((mclp.canScrollToBottom_ || 0).length === 0) {
  3643.  
  3644.           assertor(() => fnIntegrity(mclp.canScrollToBottom_, '0.9.5'));
  3645.  
  3646.           mclp.canScrollToBottom_ = function () {
  3647.             return this.atBottom && this.allowScroll && !this.hasUserJustInteracted11_();
  3648.           }
  3649.  
  3650.           console.log("canScrollToBottom_", "OK");
  3651.         } else {
  3652.           console.log("canScrollToBottom_", "NG");
  3653.         }
  3654.  
  3655.         if (ENABLE_NO_SMOOTH_TRANSFORM) {
  3656.  
  3657.           mclp.isSmoothScrollEnabled_ = function () {
  3658.             return false;
  3659.           }
  3660.  
  3661.           mclp.maybeResizeScrollContainer_ = function () {
  3662.             //
  3663.           }
  3664.  
  3665.           mclp.refreshOffsetContainerHeight_ = function () {
  3666.             //
  3667.           }
  3668.  
  3669.           mclp.smoothScroll_ = function () {
  3670.             //
  3671.           }
  3672.  
  3673.           mclp.resetSmoothScroll_ = function () {
  3674.             //
  3675.           }
  3676.           console.log("ENABLE_NO_SMOOTH_TRANSFORM", "OK");
  3677.         } else {
  3678.           console.log("ENABLE_NO_SMOOTH_TRANSFORM", "NG");
  3679.         }
  3680.  
  3681.         if (typeof mclp.handleAddChatItemAction_ === 'function' && !mclp.handleAddChatItemAction66_ && FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION && (EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL)) {
  3682.  
  3683.           mclp.handleAddChatItemAction66_ = mclp.handleAddChatItemAction_;
  3684.           mclp.handleAddChatItemAction_ = function (a) {
  3685.             try {
  3686.               if (a && typeof a === 'object' && !('length' in a)) {
  3687.                 fixLiveChatItem(a.item, null);
  3688.                 console.assert(arguments[0] === a);
  3689.               }
  3690.             } catch (e) { console.warn(e) }
  3691.             return this.handleAddChatItemAction66_.apply(this, arguments);
  3692.           }
  3693.  
  3694.           if (FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION) console.log("handleAddChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION ]", "OK");
  3695.         } else {
  3696.  
  3697.           if (FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION) console.log("handleAddChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION ]", "OK");
  3698.         }
  3699.  
  3700.  
  3701.         if (typeof mclp.handleReplaceChatItemAction_ === 'function' && !mclp.handleReplaceChatItemAction66_ && FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT && (EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL)) {
  3702.  
  3703.           mclp.handleReplaceChatItemAction66_ = mclp.handleReplaceChatItemAction_;
  3704.           mclp.handleReplaceChatItemAction_ = function (a) {
  3705.             try {
  3706.               if (a && typeof a === 'object' && !('length' in a)) {
  3707.                 fixLiveChatItem(a.replacementItem, null);
  3708.                 console.assert(arguments[0] === a);
  3709.               }
  3710.             } catch (e) { console.warn(e) }
  3711.             return this.handleReplaceChatItemAction66_.apply(this, arguments);
  3712.           }
  3713.  
  3714.           if (FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT) console.log("handleReplaceChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT ]", "OK");
  3715.         } else {
  3716.  
  3717.           if (FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT) console.log("handleReplaceChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT ]", "OK");
  3718.         }
  3719.  
  3720.         console.log("[End]");
  3721.         console.groupEnd();
  3722.  
  3723.       }).catch(console.warn);
  3724.  
  3725.  
  3726.       const tickerContainerSetAttribute = function (attrName, attrValue) { // ensure '14.30000001%'.toFixed(1)
  3727.  
  3728.         let yd = (this.__dataHost || (this.inst || 0).__dataHost || 0).__data;
  3729.  
  3730.         if (arguments.length === 2 && attrName === 'style' && yd && attrValue) {
  3731.  
  3732.           // let v = yd.containerStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_;
  3733.           let v = `${attrValue}`;
  3734.           // conside a ticker is 101px width
  3735.           // 1% = 1.01px
  3736.           // 0.2% = 0.202px
  3737.  
  3738.  
  3739.           const ratio1 = (yd.ratio * 100);
  3740.           if (ratio1 > -1) { // avoid NaN
  3741.  
  3742.             // countdownDurationMs
  3743.             // 600000 - 0.2%    <1% = 6s>  <0.2% = 1.2s>
  3744.             // 300000 - 0.5%    <1% = 3s>  <0.5% = 1.5s>
  3745.             // 150000 - 1%    <1% = 1.5s>
  3746.             // 75000 - 2%    <1% =0.75s > <2% = 1.5s>
  3747.             // 30000 - 5%    <1% =0.3s > <5% = 1.5s>
  3748.  
  3749.             // 99px * 5% = 4.95px
  3750.  
  3751.             // 15000 - 10%    <1% =0.15s > <10% = 1.5s>
  3752.  
  3753.  
  3754.             // 1% Duration
  3755.  
  3756.             let ratio2 = ratio1;
  3757.  
  3758.             const ydd = yd.data;
  3759.             if (ydd) {
  3760.  
  3761.               const d1 = ydd.durationSec;
  3762.               const d2 = ydd.fullDurationSec;
  3763.  
  3764.               // @ step timing [min. 0.2%]
  3765.               let numOfSteps = 500;
  3766.               if ((d1 === d2 || (d1 + 1 === d2)) && d1 > 1) {
  3767.                 if (d2 > 400) numOfSteps = 500; // 0.2%
  3768.                 else if (d2 > 200) numOfSteps = 200; // 0.5%
  3769.                 else if (d2 > 100) numOfSteps = 100; // 1%
  3770.                 else if (d2 > 50) numOfSteps = 50; // 2%
  3771.                 else if (d2 > 25) numOfSteps = 20; // 5% (max => 99px * 5% = 4.95px)
  3772.                 else numOfSteps = 20;
  3773.               }
  3774.               if (numOfSteps > TICKER_MAX_STEPS_LIMIT) numOfSteps = TICKER_MAX_STEPS_LIMIT;
  3775.               if (numOfSteps < 5) numOfSteps = 5;
  3776.  
  3777.               const rd = numOfSteps / 100.0;
  3778.  
  3779.               ratio2 = Math.round(ratio2 * rd) / rd;
  3780.  
  3781.               // ratio2 = Math.round(ratio2 * 5) / 5;
  3782.               ratio2 = ratio2.toFixed(1);
  3783.               v = v.replace(`${ratio1}%`, `${ratio2}%`).replace(`${ratio1}%`, `${ratio2}%`);
  3784.  
  3785.               if (yd.__style_last__ === v) return;
  3786.               yd.__style_last__ = v;
  3787.               // do not consider any delay here.
  3788.               // it shall be inside the looping for all properties changes. all the css background ops are in the same microtask.
  3789.  
  3790.             }
  3791.           }
  3792.  
  3793.           HTMLElement.prototype.setAttribute.call(dr(this), attrName, v);
  3794.  
  3795.  
  3796.         } else {
  3797.           HTMLElement.prototype.setAttribute.apply(dr(this), arguments);
  3798.         }
  3799.  
  3800.       };
  3801.  
  3802.  
  3803.       const fpTicker = (renderer) => {
  3804.         const cnt = renderer.inst || renderer;
  3805.         assertor(() => typeof (cnt || 0).is === 'string');
  3806.         assertor(() => ((cnt || 0).hostElement || 0).nodeType === 1);
  3807.         const container = (cnt.$ || 0).container;
  3808.         if (container) {
  3809.           assertor(() => (container || 0).nodeType === 1);
  3810.           assertor(() => typeof container.setAttribute === 'function');
  3811.           container.setAttribute = tickerContainerSetAttribute;
  3812.         } else {
  3813.           console.warn(`"container" does not exist in ${cnt.is}`);
  3814.         }
  3815.       };
  3816.  
  3817.  
  3818.       const tags = ["yt-live-chat-ticker-paid-message-item-renderer", "yt-live-chat-ticker-paid-sticker-item-renderer",
  3819.         "yt-live-chat-ticker-renderer", "yt-live-chat-ticker-sponsor-item-renderer"];
  3820.  
  3821.  
  3822.       Promise.all(tags.map(tag => customElements.whenDefined(tag))).then(() => {
  3823.  
  3824.         mightFirstCheckOnYtInit();
  3825.         groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-... hacks");
  3826.         console.log("[Begin]");
  3827.  
  3828.         // << if ENABLE_VIDEO_PROGRESS_STATE_FIX >>
  3829.         let isMainVideoOngoing = null;
  3830.         let mainVideoLastProgress = null;
  3831.         // << end >>
  3832.  
  3833.         for (const tag of tags) {
  3834.           const dummy = document.createElement(tag);
  3835.  
  3836.           const cProto = getProto(dummy);
  3837.           if (!cProto || !cProto.attached) {
  3838.             console.warn(`proto.attached for ${tag} is unavailable.`);
  3839.             continue;
  3840.           }
  3841.  
  3842.           cProto.attached77 = cProto.attached;
  3843.  
  3844.           cProto.attached = function () {
  3845.             fpTicker(this.hostElement || this);
  3846.             return this.attached77();
  3847.           }
  3848.  
  3849.           for (const elm of document.getElementsByTagName(tag)) {
  3850.             if ((elm || elm.inst).isAttached === true) {
  3851.               fpTicker(elm);
  3852.             }
  3853.           }
  3854.  
  3855.  
  3856.           let rafHackState = 0;
  3857.  
  3858.           let isTimingFunctionHackable = false;
  3859.  
  3860.           let urt = 0;
  3861.  
  3862.           if (typeof cProto.startCountdown === 'function' && typeof cProto.updateTimeout === 'function' && typeof cProto.isAnimationPausedChanged === 'function') {
  3863.  
  3864.             // console.log('startCountdown', typeof cProto.startCountdown)
  3865.             // console.log('updateTimeout', typeof cProto.updateTimeout)
  3866.             // console.log('isAnimationPausedChanged', typeof cProto.isAnimationPausedChanged)
  3867.  
  3868.             isTimingFunctionHackable = fnIntegrity(cProto.startCountdown, '2.66.37') && fnIntegrity(cProto.updateTimeout, '1.76.45') && fnIntegrity(cProto.isAnimationPausedChanged, '2.56.30')
  3869.  
  3870.           } else {
  3871.             console.log(`Skip Timing Function Modification for ${tag}`);
  3872.             continue;
  3873.           }
  3874.  
  3875.  
  3876.           if (ENABLE_RAF_HACK_TICKERS && rafHub !== null) {
  3877.  
  3878.             // cancelable - this.rafId < isAnimationPausedChanged >
  3879.             rafHackState = 1;
  3880.  
  3881.             if (isTimingFunctionHackable) {
  3882.               rafHackState = 2;
  3883.  
  3884.             } else {
  3885.               rafHackState = 4;
  3886.             }
  3887.  
  3888.           }
  3889.  
  3890.           const isCSSPropertySupported = () => {
  3891.  
  3892.             if (typeof CSS !== 'object' || typeof (CSS || 0).registerProperty !== 'function') return;
  3893.             const documentElement = document.documentElement;
  3894.             if (!documentElement) {
  3895.               console.warn('document.documentElement is not found');
  3896.               return false;
  3897.             }
  3898.             if (`${window.getComputedStyle(documentElement).getPropertyValue('--ticker-rtime')}`.length === 0) {
  3899.               return false;
  3900.             }
  3901.             return true;
  3902.  
  3903.           };
  3904.  
  3905.           const doAnimator = !!ATTEMPT_ANIMATED_TICKER_BACKGROUND && isTimingFunctionHackable && typeof KeyframeEffect === 'function' && typeof animate === 'function' && typeof cProto.computeContainerStyle === 'function' && typeof cProto.colorFromDecimal === 'function' && isCSSPropertySupported();
  3906.  
  3907.           const doRAFHack = rafHackState === 2;
  3908.  
  3909.           cProto._throwOut = function () {
  3910.             this._r782 = 1;
  3911.             Promise.resolve().then(() => {
  3912.               this.detached();
  3913.               this.data = null;
  3914.               this.countdownMs = 0;
  3915.               this.lastCountdownTimeMs = null;
  3916.               if (this.__dataClientsReady === true) this.__dataClientsReady = false;
  3917.               if (this.__dataEnabled === true) this.__dataEnabled = false;
  3918.               if (this.__dataReady === true) this.__dataReady = false;
  3919.               const hm = this.hostElement || this;
  3920.               if (hm.parentNode) hm.remove();
  3921.               if (hm.firstChild) hm.textContent = '';
  3922.             }).catch(e => {
  3923.               console.warn(e);
  3924.             });
  3925.           };
  3926.  
  3927.           // cProto._checkTickerBackgroundChanged = doAnimator ? function () {
  3928.           //   if (runTickerClassName === 'run-ticker') {
  3929.           //     const container = (this.$ || 0).container || 0;
  3930.           //     if (!container) return;
  3931.           //     container.classList.add('run-ticker-test');
  3932.           //     const evaluated = `${window.getComputedStyle(container).background}`;
  3933.           //     container.classList.remove('run-ticker-test');
  3934.           //     if (evaluated.indexOf('0.') < 4) {
  3935.           //       // not fulfilling
  3936.           //       // rgba(0, 0, 0, 0.004) none repeat scroll 0% 0% / auto padding-box border-box
  3937.           //       runTickerClassName = 'run-ticker-forced';
  3938.           //       console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | Incompatibility Found"}`,
  3939.           //         "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
  3940.           //         "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
  3941.           //       );
  3942.           //       console.warn(`%cWarning:\n\tYou might have added a userscript or extension that hacks ticker background too.\n\tYouTube Super Fast Chat will override it for you.`, 'color: #bada55');
  3943.           //       console.groupEnd();
  3944.           //     }
  3945.           //   }
  3946.           // } : null;
  3947.  
  3948.           cProto._makeAnimator = doAnimator ? function () {
  3949.             if (this._r782) return;
  3950.             // if (!this.isAttached) return;
  3951.             if (!this._runnerAE) {
  3952.               const aElement = (this.$ || 0).container;
  3953.               if (!aElement) return console.warn("this.$.container is undefined");
  3954.               const da = this.data;
  3955.               if (!da || !da.startBackgroundColor || !da.endBackgroundColor) return console.warn("this.data is undefined or incorrect");
  3956.               const c1 = this.colorFromDecimal(da.startBackgroundColor);
  3957.               const c2 = this.colorFromDecimal(da.endBackgroundColor);
  3958.               if (typeof c1 !== 'string' || typeof c2 !== 'string') return console.warn('c1, c2 is not a string');
  3959.  
  3960.               // if (!this.__tickerBackgroundInitialChecked__) {
  3961.               //   this.constructor.prototype.__tickerBackgroundInitialChecked__ = true;
  3962.               //   console.log('__tickerBackgroundInitialChecked__')
  3963.               //   this._checkTickerBackgroundChanged();
  3964.               // }
  3965.  
  3966.               aElement.style.setProperty('--ticker-c1', c1);
  3967.               aElement.style.setProperty('--ticker-c2', c2);
  3968.               aElement.classList.add(runTickerClassName);
  3969.               const p = (this.countdownMs / this.countdownDurationMs) * 100;
  3970.               // this._aeStartV = this.countdownMs;
  3971.               // this._aeStartT = this.countdownDurationMs;
  3972.               if (!(p >= 0 && p <= 100)) {
  3973.                 console.warn('incorrect time ratio', p);
  3974.               } else {
  3975.                 /*
  3976.                 const u0 = p.toFixed(4) + '%';
  3977.                 this._runnerAE = animate.call(aElement,
  3978.                   [
  3979.                     { '--ticker-rtime': u0 },
  3980.                     { '--ticker-rtime': '0%' }
  3981.                   ]
  3982.                   ,
  3983.                   {
  3984.                     fill: "forwards",
  3985.                     duration: this.countdownMs,
  3986.                     easing: "linear"
  3987.                   }
  3988.                 );
  3989.                 */
  3990.  
  3991.                 let timingFn = 'linear';
  3992.  
  3993.                 const totalDuration = this.countdownDurationMs;
  3994.  
  3995.                 if (ATTEMPT_ANIMATED_TICKER_BACKGROUND === 'steps') {
  3996.  
  3997.                   // @ step timing [min. 0.2%]
  3998.                   let stepInterval = 0.2; // unit: %
  3999.                   if (totalDuration > 400000) stepInterval = 0.2;
  4000.                   else if (totalDuration > 200000) stepInterval = 0.5;
  4001.                   else if (totalDuration > 100000) stepInterval = 1;
  4002.                   else if (totalDuration > 50000) stepInterval = 2;
  4003.                   else if (totalDuration > 25000) stepInterval = 5;
  4004.                   else stepInterval = 5;
  4005.  
  4006.                   let numOfSteps = Math.round(100 / stepInterval);
  4007.  
  4008.                   if (numOfSteps > TICKER_MAX_STEPS_LIMIT) numOfSteps = TICKER_MAX_STEPS_LIMIT;
  4009.                   if (numOfSteps < 5) numOfSteps = 5;
  4010.  
  4011.                   timingFn = `steps(${numOfSteps}, end)`;
  4012.  
  4013.                 }
  4014.  
  4015.  
  4016.  
  4017.                 this._runnerAE = animate.call(aElement,
  4018.                   [
  4019.                     { '--ticker-rtime': '100%' },
  4020.                     { '--ticker-rtime': '0%' }
  4021.                   ]
  4022.                   ,
  4023.                   {
  4024.                     fill: "forwards",
  4025.                     duration: totalDuration,
  4026.                     easing: timingFn
  4027.                   }
  4028.                 );
  4029.  
  4030.                 this._runnerAE.onfinish = () => {
  4031.                   if (this.isAttached === true && !this._r782 && ((this.$ || 0).container || 0).isConnected === true) {
  4032.                     this._aeFinished();
  4033.                   }
  4034.                 }
  4035.  
  4036.                 let bq = (1.0 - (this.countdownMs / totalDuration)) * totalDuration;
  4037.                 if (bq >= 0 && bq <= totalDuration) {
  4038.  
  4039.                   this._runnerAE.currentTime = bq
  4040.                 } else {
  4041.                   console.warn('Error on setting _runnerAE.currentTime!');
  4042.                 }
  4043.  
  4044.  
  4045.                 aeConstructor = this._runnerAE.constructor; // constructor is from iframe
  4046.                 return this._runnerAE;
  4047.               }
  4048.             } else {
  4049.               if (!aeConstructor) return console.warn('aeConstructor is undefined');
  4050.               // assume just time update
  4051.               const ae = this._runnerAE;
  4052.               if (!(ae instanceof aeConstructor)) return console.warn('this._runnerAE is not Animation');
  4053.               if (ae.playState !== 'paused') console.warn('ae.playState !== paused');
  4054.               let p = (this.countdownMs / this.countdownDurationMs) * 100;
  4055.               if (!(p >= 0 && p <= 100)) {
  4056.                 console.warn('incorrect time ratio', p);
  4057.               } else {
  4058.                 // let u0 = p.toFixed(4) + '%'
  4059.                 /*
  4060.                 ae.effect.setKeyframes([
  4061.                   { '--ticker-rtime': u0 },
  4062.                   { '--ticker-rtime': '0%' }
  4063.                 ]);
  4064.                 ae.effect.updateTiming({ duration: this.countdownMs });
  4065.                 */
  4066.                 // ae.currentTime = 0;
  4067.  
  4068.  
  4069.  
  4070.                 let bq = (1.0 - (this.countdownMs / this.countdownDurationMs)) * this.countdownDurationMs;
  4071.                 if (bq >= 0 && bq <= this.countdownDurationMs) {
  4072.  
  4073.                   this._runnerAE.currentTime = bq
  4074.                 } else {
  4075.                   console.warn('Error on setting _runnerAE.currentTime!');
  4076.                 }
  4077.  
  4078.  
  4079.                 ae.play();
  4080.                 return ae;
  4081.               }
  4082.             }
  4083.           } : null;
  4084.  
  4085.           cProto._aeFinished = doAnimator ? function () {
  4086.  
  4087.             if (this._r782) return;
  4088.  
  4089.             if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
  4090.               this._throwOut();
  4091.               return;
  4092.             }
  4093.  
  4094.             if (doAnimator) {
  4095.               if (!this._runnerAE) console.warn('Error in .updateTimeout; this._runnerAE is undefined');
  4096.  
  4097.               let lc = window.performance.now();
  4098.               this.countdownMs = Math.max(0, this.countdownMs - (lc - this.lastCountdownTimeMs));
  4099.               if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
  4100.               this.lastCountdownTimeMs = lc;
  4101.               if (this.countdownMs > 10) console.warn('Warning: this.countdownMs is not zero when finished!', this.countdownMs); // just warning.
  4102.  
  4103.               this.countdownMs = 0;
  4104.               this.lastCountdownTimeMs = null;
  4105.  
  4106.               if (this.isAttached) {
  4107.                 if (Date.now() - windowShownAt < 80) {
  4108.                   // no animation if the video page is switched from background to foreground
  4109.                   this.hostElement.style.display = 'none';
  4110.                 } else {
  4111.                   "auto" === this.hostElement.style.width && this.setContainerWidth();
  4112.                   this.slideDown();
  4113.                 }
  4114.               }
  4115.  
  4116.  
  4117.             } else {
  4118.               console.warn('unexpected issue')
  4119.             }
  4120.           } : null;
  4121.  
  4122.  
  4123.           if (ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX) {
  4124.  
  4125.             if (typeof cProto.handlePauseReplay === 'function' && !cProto.handlePauseReplay66 && cProto.handlePauseReplay.length === 0) {
  4126.               urt++;
  4127.               assertor(() => fnIntegrity(cProto.handlePauseReplay, '0.12.4'));
  4128.               cProto.handlePauseReplay66 = cProto.handlePauseReplay;
  4129.               cProto.handlePauseReplay = function () {
  4130.                 if (this.isAttached) {
  4131.  
  4132.                   if (pairForPauseResumeM === 0) {
  4133.                     pairForPauseResume++;
  4134.                     if (pairForPauseResume > 1e9) pairForPauseResume = pairForPauseResume % 1e4;
  4135.                   }
  4136.                   // console.log('handlePauseReplay');
  4137.                   // console.log('handlePauseReplay', pairForPauseResume);
  4138.                   const r = this.handlePauseReplay66.apply(this, arguments);
  4139.                   isMainVideoOngoing = false;
  4140.                   return r;
  4141.                 }
  4142.               };
  4143.             } else {
  4144.               console.log('Error for setting cProto.handlePauseReplay', tag)
  4145.             }
  4146.  
  4147.             if (typeof cProto.handleResumeReplay === 'function' && !cProto.handleResumeReplay66 && cProto.handlePauseReplay.length === 0) {
  4148.               urt++;
  4149.               assertor(() => fnIntegrity(cProto.handleResumeReplay, '0.8.2'));
  4150.               cProto.handleResumeReplay66 = cProto.handleResumeReplay;
  4151.               cProto.handleResumeReplay = function () {
  4152.                 if (this.isAttached) {
  4153.  
  4154.                   if (pairForPauseResumeM === 0) {
  4155.                     pairForPauseResume++;
  4156.                     if (pairForPauseResume > 1e9) pairForPauseResume = pairForPauseResume % 1e4;
  4157.                   }
  4158.                   // console.log('handleResumeReplay');
  4159.                   // console.log('handleResumeReplay', pairForPauseResume);
  4160.                   const r = this.handleResumeReplay66.apply(this, arguments);
  4161.                   isMainVideoOngoing = true;
  4162.                   return r;
  4163.  
  4164.                 }
  4165.               };
  4166.             } else {
  4167.               console.log('Error for setting cProto.handleResumeReplay', tag)
  4168.             }
  4169.  
  4170.             if (typeof cProto.handleReplayProgress === 'function' && !cProto.handleReplayProgress66 && cProto.handleReplayProgress.length === 1) {
  4171.               urt++;
  4172.               assertor(() => fnIntegrity(cProto.handleReplayProgress, '1.16.13'));
  4173.               cProto.handleReplayProgress66 = cProto.handleReplayProgress;
  4174.               cProto.handleReplayProgress = function (a) {
  4175.                 if (this.isAttached) {
  4176.                   const p = mainVideoLastProgress;
  4177.                   mainVideoLastProgress = a;
  4178.                   if (isMainVideoOngoing === false) { // ignore isMainVideoOngoing === null ?
  4179.                     const d = a - p;
  4180.                     if (d > 0 && d < 0.28) isMainVideoOngoing = true; // timeupdate
  4181.                     // 0.28 is due to
  4182.                     //    - most browsers will fire the timeupdate event between 4 to 60 times per second
  4183.                     //    - i.e. timeupdate roughly every 15-250 milliseconds
  4184.                   }
  4185.                   let promiseResult = null;
  4186.                   if (this.isAnimationPaused) {
  4187.                     // unstable state for isMainVideoOngoing; delay required
  4188.                     // all the tickers' handleReplayProgress are executed in the same microtask
  4189.                     // execute after result returned
  4190.                     const lz1 = pairForPauseResume;
  4191.                     Promise.resolve().then(() => {
  4192.                       return promiseResult
  4193.                     }).then(() => {
  4194.  
  4195.  
  4196.                       if (isMainVideoOngoing === true && this.isAnimationPaused) {
  4197.                         const lz2 = pairForPauseResume;
  4198.                         // console.log( 10044000, lz1, lz2 , mainVideoLastProgress - a, isMainVideoOngoing  )
  4199.                         if (lz1 === lz2 && mainVideoLastProgress !== null && mainVideoLastProgress - a >= -1e-5) this.isAnimationPaused = false; // trigger isAnimationPausedChanged
  4200.                       }
  4201.  
  4202.                     });
  4203.                   }
  4204.  
  4205.                   const lq1 = pairForPauseResume;
  4206.                   promiseResult = Promise.resolve().then(() => {
  4207.                     const lq2 = pairForPauseResume;
  4208.  
  4209.                     if (lq1 === lq2) {
  4210.                       this.handleReplayProgress66(a);
  4211.                     }
  4212.  
  4213.  
  4214.                   })
  4215.  
  4216.                 }
  4217.               };
  4218.             } else {
  4219.               console.log('Error for setting cProto.handleReplayProgress', tag)
  4220.             }
  4221.  
  4222.           }
  4223.  
  4224.           const ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED = ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX && urt === 3;
  4225.  
  4226.           const doTimerFnModification = (doRAFHack || doAnimator);
  4227.  
  4228.           let windowShownAt = 0;
  4229.           if (doTimerFnModification) {
  4230.  
  4231.             window.addEventListener('visibilitychange', () => {
  4232.               if (document.visibilityState === 'visible') windowShownAt = Date.now();
  4233.               else windowShownAt = 0;
  4234.             }, false);
  4235.  
  4236.           }
  4237.  
  4238.           cProto.startCountdown = doTimerFnModification ? function (a, b) { // .startCountdown(a.durationSec, a.fullDurationSec)
  4239.  
  4240.             // a.durationSec [s] => countdownMs [ms]
  4241.             // a.fullDurationSec [s] => countdownDurationMs [ms] OR countdownMs [ms]
  4242.             // lastCountdownTimeMs => raf ongoing
  4243.             // lastCountdownTimeMs = 0 when rafId = 0 OR countdownDurationMs = 0
  4244.  
  4245.             if (this._r782) return;
  4246.  
  4247.             if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
  4248.               this._throwOut();
  4249.               return;
  4250.             }
  4251.  
  4252.             if (doAnimator) {
  4253.               b = void 0 === b ? 0 : b;
  4254.               if (void 0 !== a) {
  4255.                 this.countdownMs = 1E3 * a; // decreasing from durationSec[s] to zero
  4256.                 this.countdownDurationMs = b ? 1E3 * b : this.countdownMs; // constant throughout the animation
  4257.                 if (!(this.lastCountdownTimeMs || this.isAnimationPaused)) {
  4258.                   this.lastCountdownTimeMs = performance.now()
  4259.                   this.rafId = 1
  4260.                   if (this._runnerAE) console.warn('Error in .startCountdown; this._runnerAE already created.')
  4261.                   this.detlaSincePausedSecs = 0;
  4262.                   const ae = this._makeAnimator();
  4263.                   if (!ae) console.warn('Error in startCountdown._makeAnimator()');
  4264.  
  4265.                   // console.log(539, isMainVideoOngoing)
  4266.                   if (this.isAnimationPaused === void 0 && ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED && isMainVideoOngoing === false && mainVideoLastProgress !== null) {
  4267.                     // << This is mainly for [PlayBack Replay] backwards >>
  4268.                     // fix the case when the main video is paused but due to seeking the tickers are added
  4269.                     // play first then pause immediately to allow the visual effect of initial state
  4270.                     // don't forget to set the "playerProgressSec"
  4271.                     // otherwise when it resumes from paused state, the detlaSincePausedSecs will be huge
  4272.                     this.playerProgressSec = mainVideoLastProgress; // save the progress first
  4273.                     this.isAnimationPaused = true; // trigger isAnimationPausedChanged
  4274.                     this.detlaSincePausedSecs = 0;
  4275.                     this._forceNoDetlaSincePausedSecs783 = 1; // reset this.detlaSincePausedSecs = 0 when resumed
  4276.                   }
  4277.                 }
  4278.               }
  4279.             } else {
  4280.               // console.log('cProto.startCountdown', tag) // yt-live-chat-ticker-sponsor-item-renderer
  4281.               if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  4282.               b = void 0 === b ? 0 : b;
  4283.               void 0 !== a && (this.countdownMs = 1E3 * a,
  4284.                 this.countdownDurationMs = b ? 1E3 * b : this.countdownMs,
  4285.                 this.ratio = 1,
  4286.                 this.lastCountdownTimeMs || this.isAnimationPaused || (this.lastCountdownTimeMs = performance.now(),
  4287.                   this.rafId = rafHub.request(this.boundUpdateTimeout37_)))
  4288.             }
  4289.  
  4290.           } : cProto.startCountdown;
  4291.  
  4292.           cProto.updateTimeout = doTimerFnModification ? function (a) {
  4293.  
  4294.             if (this._r782) return;
  4295.  
  4296.             if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
  4297.               this._throwOut();
  4298.               return;
  4299.             }
  4300.  
  4301.             if (doAnimator) {
  4302.               if (!this._runnerAE) console.warn('Error in .updateTimeout; this._runnerAE is undefined');
  4303.               this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
  4304.               if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
  4305.               if (this.isAttached && this.countdownMs) {
  4306.                 this.lastCountdownTimeMs = a
  4307.                 const ae = this._makeAnimator(); // request raf
  4308.                 if (!ae) console.warn('Error in startCountdown._makeAnimator()');
  4309.               } else {
  4310.                 (this.lastCountdownTimeMs = null,
  4311.                   this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
  4312.                     this.slideDown()));
  4313.               }
  4314.             } else {
  4315.               // console.log('cProto.updateTimeout', tag) // yt-live-chat-ticker-sponsor-item-renderer
  4316.               if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  4317.               this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
  4318.               this.ratio = this.countdownMs / this.countdownDurationMs;
  4319.               this.isAttached && this.countdownMs ? (this.lastCountdownTimeMs = a,
  4320.                 this.rafId = rafHub.request(this.boundUpdateTimeout37_)) : (this.lastCountdownTimeMs = null,
  4321.                   this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
  4322.                     this.slideDown()))
  4323.             }
  4324.  
  4325.           } : cProto.updateTimeout;
  4326.  
  4327.           // let ez = 0;
  4328.           cProto.isAnimationPausedChanged = doTimerFnModification ? function (a, b) {
  4329.  
  4330.             if (this._r782) return;
  4331.  
  4332.             if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
  4333.               this._throwOut();
  4334.               return;
  4335.             }
  4336.             let forceNoDetlaSincePausedSecs783 = this._forceNoDetlaSincePausedSecs783;
  4337.             this._forceNoDetlaSincePausedSecs783 = 0;
  4338.  
  4339.             Promise.resolve().then(() => {
  4340.  
  4341.               if (doAnimator) {
  4342.  
  4343.                 const playState = (this._runnerAE || 0).playState;
  4344.                 if (a && playState === 'running') {
  4345.  
  4346.                 } else if (!a && playState !== 'running' && b) {
  4347.  
  4348.                 } else {
  4349.                   return;
  4350.                 }
  4351.               }
  4352.  
  4353.               // if (Math.abs(this.detlaSincePausedSecs) < 0.01) this.detlaSincePausedSecs = 0;
  4354.               if (doAnimator) {
  4355.                 const pu = () => { // running -> pause
  4356.                   this._runnerAE.pause()
  4357.                   let lc = window.performance.now();
  4358.                   this.countdownMs = Math.max(0, this.countdownMs - (lc - this.lastCountdownTimeMs));
  4359.                   if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
  4360.                   this.lastCountdownTimeMs = lc;
  4361.                 };
  4362.                 const wa = () => { // pause -> running
  4363.                   if (forceNoDetlaSincePausedSecs783) this.detlaSincePausedSecs = 0;
  4364.                   a = this.detlaSincePausedSecs ? (this.lastCountdownTimeMs || 0) + 1000 * this.detlaSincePausedSecs : (this.lastCountdownTimeMs || 0);
  4365.                   this.detlaSincePausedSecs = 0;
  4366.                   this.updateTimeout(a);
  4367.                   this.lastCountdownTimeMs = window.performance.now();
  4368.                 };
  4369.                 a ? (this._runnerAE && pu()) : (!a && b && wa());
  4370.               } else {
  4371.                 // ez++;
  4372.                 // if(ez> 1e9) ez=9;
  4373.                 if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  4374.                 a ? rafHub.cancel(this.rafId) : !a && b && (a = this.lastCountdownTimeMs || 0,
  4375.                   this.detlaSincePausedSecs && (a = (this.lastCountdownTimeMs || 0) + 1E3 * this.detlaSincePausedSecs,
  4376.                     this.detlaSincePausedSecs = 0),
  4377.                   this.boundUpdateTimeout37_(a),
  4378.                   this.lastCountdownTimeMs = window.performance.now())
  4379.               }
  4380.  
  4381.             }).catch(e => {
  4382.               console.log(e);
  4383.             });
  4384.  
  4385.  
  4386.  
  4387.           } : cProto.isAnimationPausedChanged;
  4388.  
  4389.  
  4390.           if (doAnimator) {
  4391.  
  4392.             assertor(() => fnIntegrity(cProto.computeContainerStyle, '2.81.31'));
  4393.  
  4394.             let dummyValueForStyleReturn = null;
  4395.  
  4396.             cProto.computeContainerStyle66 = cProto.computeContainerStyle;
  4397.             cProto.computeContainerStyle = function (a, b) {
  4398.  
  4399.               if (this._r782) return;
  4400.  
  4401.               if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
  4402.                 this._throwOut();
  4403.                 return;
  4404.               }
  4405.  
  4406.               const fullDurationSec = a ? a.fullDurationSec : 0;
  4407.               if (fullDurationSec > 0 && typeof b === 'number') {
  4408.  
  4409.                 // usually zero
  4410.  
  4411.                 // let currentDuationSrc = b * fullDurationSec; // a.durationSec
  4412.  
  4413.                 // console.log(231, fullDurationSec, b, currentDuationSrc, a.durationSec);
  4414.  
  4415.                 /*
  4416.                 if (a.mdsz && typeof a.mdst) return a.mdst;
  4417.                 a.mdsz = 1;
  4418.  
  4419.  
  4420.  
  4421.                 let c1 = this.colorFromDecimal(a.startBackgroundColor);
  4422.                 let c2 = this.colorFromDecimal(a.endBackgroundColor);
  4423.  
  4424.                 let ratio = currentDuationSrc / fullDurationSec;
  4425.  
  4426.                 let m = (ratio * 100).toFixed(1);
  4427.  
  4428.  
  4429.                 let s = `--background:linear-gradient(90deg, ${c1},${c1} ${m}%,${c2} ${m}%,${c2});`
  4430.                 let ro = {
  4431.                   "privateDoNotAccessOrElseSafeStyleWrappedValue_": s,
  4432.                   "implementsGoogStringTypedString": true
  4433.                 };
  4434.  
  4435.                 ro.getTypedStringValue = ro.toString = function () { return this.privateDoNotAccessOrElseSafeStyleWrappedValue_ };
  4436.  
  4437.                 a.mdst = s;
  4438.  
  4439.                 return ro;
  4440.                 */
  4441.               }
  4442.  
  4443.  
  4444.  
  4445.               // return this.computeContainerStyle66.apply(this, arguments);
  4446.  
  4447.               if (dummyValueForStyleReturn === null) {
  4448.  
  4449.                 let s = `--nx:82;`
  4450.                 let ro = {
  4451.                   "privateDoNotAccessOrElseSafeStyleWrappedValue_": s,
  4452.                   "implementsGoogStringTypedString": true
  4453.                 };
  4454.  
  4455.                 ro.getTypedStringValue = ro.toString = function () { return this.privateDoNotAccessOrElseSafeStyleWrappedValue_ };
  4456.  
  4457.  
  4458.                 dummyValueForStyleReturn = ro;
  4459.  
  4460.  
  4461.               }
  4462.  
  4463.  
  4464.               return dummyValueForStyleReturn;
  4465.  
  4466.  
  4467.             }
  4468.  
  4469.           }
  4470.  
  4471.           if (doTimerFnModification === true) hasTimerModified = true;
  4472.  
  4473.           if (!!ATTEMPT_ANIMATED_TICKER_BACKGROUND) {
  4474.             console.log('ATTEMPT_ANIMATED_TICKER_BACKGROUND', tag, doAnimator ? 'OK' : 'NG');
  4475.           }
  4476.  
  4477.           if (!doAnimator && (rafHackState === 2 || rafHackState === 4)) {
  4478.             console.log('RAF_HACK_TICKERS', tag, doRAFHack ? "OK" : "NG");
  4479.           }
  4480.  
  4481.         }
  4482.         console.log("[End]");
  4483.         console.groupEnd();
  4484.  
  4485.  
  4486.       }).catch(console.warn);
  4487.  
  4488.       customElements.whenDefined('yt-live-chat-ticker-renderer').then(() => {
  4489.  
  4490.         mightFirstCheckOnYtInit();
  4491.         groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-renderer hacks");
  4492.         console.log("[Begin]");
  4493.         (() => {
  4494.  
  4495.           const tag = "yt-live-chat-ticker-renderer"
  4496.           const dummy = document.createElement(tag);
  4497.  
  4498.           const cProto = getProto(dummy);
  4499.           if (!cProto || !cProto.attached) {
  4500.             console.warn(`proto.attached for ${tag} is unavailable.`);
  4501.             return;
  4502.           }
  4503.  
  4504.           if (RAF_FIX_keepScrollClamped) {
  4505.  
  4506.             // to be improved
  4507.  
  4508.             if (typeof cProto.keepScrollClamped === 'function' && !cProto.keepScrollClamped72 && fnIntegrity(cProto.keepScrollClamped) === '0.17.10') {
  4509.  
  4510.               cProto.keepScrollClamped72 = cProto.keepScrollClamped;
  4511.               cProto.keepScrollClamped = function () {
  4512.                 this._bound_keepScrollClamped = this._bound_keepScrollClamped || this.keepScrollClamped.bind(this);
  4513.                 this.scrollClampRaf = requestAnimationFrame(this._bound_keepScrollClamped);
  4514.                 this.maybeClampScroll()
  4515.               }
  4516.  
  4517.               console.log('RAF_FIX: keepScrollClamped', tag, "OK")
  4518.             } else {
  4519.  
  4520.               assertor(() => fnIntegrity(cProto.keepScrollClamped, '0.17.10'));
  4521.               console.log('RAF_FIX: keepScrollClamped', tag, "NG")
  4522.             }
  4523.  
  4524.           }
  4525.  
  4526.  
  4527.           if (RAF_FIX_scrollIncrementally && typeof cProto.startScrolling === 'function' && typeof cProto.scrollIncrementally === 'function' && fnIntegrity(cProto.startScrolling) === '1.44.32' && fnIntegrity(cProto.scrollIncrementally) === '1.82.43') {
  4528.             // to be replaced by animator
  4529.  
  4530.             cProto.startScrolling = function (a) {
  4531.               this.scrollStopHandle && this.cancelAsync(this.scrollStopHandle);
  4532.               this.asyncHandle && cancelAnimationFrame(this.asyncHandle);
  4533.               this.lastFrameTimestamp = this.scrollStartTime = performance.now();
  4534.               this.scrollRatePixelsPerSecond = a;
  4535.               this._bound_scrollIncrementally = this._bound_scrollIncrementally || this.scrollIncrementally.bind(this);
  4536.               this.asyncHandle = requestAnimationFrame(this._bound_scrollIncrementally)
  4537.             };
  4538.  
  4539.             cProto.scrollIncrementally = function (a) {
  4540.               var b = a - (this.lastFrameTimestamp || 0);
  4541.               this.$.items.scrollLeft += b / 1E3 * (this.scrollRatePixelsPerSecond || 0);
  4542.               this.maybeClampScroll();
  4543.               this.updateArrows();
  4544.               this.lastFrameTimestamp = a;
  4545.               this._bound_scrollIncrementally = this._bound_scrollIncrementally || this.scrollIncrementally.bind(this);
  4546.               0 < this.$.items.scrollLeft || this.scrollRatePixelsPerSecond && 0 < this.scrollRatePixelsPerSecond ? this.asyncHandle = requestAnimationFrame(this._bound_scrollIncrementally) : this.stopScrolling()
  4547.             };
  4548.  
  4549.             console.log('RAF_FIX: scrollIncrementally', tag, "OK")
  4550.           } else {
  4551.             assertor(() => fnIntegrity(cProto.startScrolling, '1.44.32'));
  4552.             assertor(() => fnIntegrity(cProto.scrollIncrementally, '1.82.43'));
  4553.             console.log('RAF_FIX: scrollIncrementally', tag, "NG")
  4554.           }
  4555.  
  4556.  
  4557.         })();
  4558.  
  4559.         console.log("[End]");
  4560.  
  4561.         console.groupEnd();
  4562.  
  4563.       }).catch(console.warn);
  4564.  
  4565.  
  4566.       if (ENABLE_RAF_HACK_INPUT_RENDERER && rafHub !== null) {
  4567.  
  4568.  
  4569.         customElements.whenDefined("yt-live-chat-message-input-renderer").then(() => {
  4570.  
  4571.           mightFirstCheckOnYtInit();
  4572.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-message-input-renderer hacks");
  4573.           console.log("[Begin]");
  4574.           (() => {
  4575.  
  4576.             const tag = "yt-live-chat-message-input-renderer"
  4577.             const dummy = document.createElement(tag);
  4578.  
  4579.             const cProto = getProto(dummy);
  4580.             if (!cProto || !cProto.attached) {
  4581.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4582.               return;
  4583.             }
  4584.  
  4585.             let doHack = false;
  4586.             if (typeof cProto.handleTimeout === 'function' && typeof cProto.updateTimeout === 'function') {
  4587.  
  4588.               // not cancellable
  4589.  
  4590.  
  4591.               doHack = fnIntegrity(cProto.handleTimeout, '1.27.16') && fnIntegrity(cProto.updateTimeout, '1.50.33');
  4592.  
  4593.             }
  4594.  
  4595.             if (doHack) {
  4596.  
  4597.               cProto.handleTimeout = function (a) {
  4598.                 console.log('cProto.handleTimeout', tag)
  4599.                 if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  4600.                 this.timeoutDurationMs = this.timeoutMs = a;
  4601.                 this.countdownRatio = 1;
  4602.                 0 === this.lastTimeoutTimeMs && rafHub.request(this.boundUpdateTimeout38_)
  4603.               };
  4604.               cProto.updateTimeout = function (a) {
  4605.                 console.log('cProto.updateTimeout', tag)
  4606.                 if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  4607.                 this.lastTimeoutTimeMs && (this.timeoutMs = Math.max(0, this.timeoutMs - (a - this.lastTimeoutTimeMs)),
  4608.                   this.countdownRatio = this.timeoutMs / this.timeoutDurationMs);
  4609.                 this.isAttached && this.timeoutMs ? (this.lastTimeoutTimeMs = a,
  4610.                   rafHub.request(this.boundUpdateTimeout38_)) : this.lastTimeoutTimeMs = 0
  4611.               };
  4612.  
  4613.               console.log('RAF_HACK_INPUT_RENDERER', tag, "OK")
  4614.             } else {
  4615.  
  4616.               console.log('typeof handleTimeout', typeof cProto.handleTimeout)
  4617.               console.log('typeof updateTimeout', typeof cProto.updateTimeout)
  4618.  
  4619.               console.log('RAF_HACK_INPUT_RENDERER', tag, "NG")
  4620.             }
  4621.  
  4622.           })();
  4623.  
  4624.           console.log("[End]");
  4625.  
  4626.           console.groupEnd();
  4627.  
  4628.  
  4629.         })
  4630.  
  4631.  
  4632.       }
  4633.  
  4634.       if (ENABLE_RAF_HACK_EMOJI_PICKER && rafHub !== null) {
  4635.  
  4636.  
  4637.         customElements.whenDefined("yt-emoji-picker-renderer").then(() => {
  4638.  
  4639.           mightFirstCheckOnYtInit();
  4640.           groupCollapsed("YouTube Super Fast Chat", " | yt-emoji-picker-renderer hacks");
  4641.           console.log("[Begin]");
  4642.           (() => {
  4643.  
  4644.             const tag = "yt-emoji-picker-renderer"
  4645.             const dummy = document.createElement(tag);
  4646.  
  4647.             const cProto = getProto(dummy);
  4648.             if (!cProto || !cProto.attached) {
  4649.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4650.               return;
  4651.             }
  4652.  
  4653.             let doHack = false;
  4654.             if (typeof cProto.animateScroll_ === 'function') {
  4655.  
  4656.               // not cancellable
  4657.               console.log('animateScroll_', typeof cProto.animateScroll_)
  4658.  
  4659.               doHack = fnIntegrity(cProto.animateScroll_, '1.102.49')
  4660.  
  4661.             }
  4662.  
  4663.             if (doHack) {
  4664.  
  4665.               const querySelector = HTMLElement.prototype.querySelector;
  4666.               const U = (element) => ({
  4667.                 querySelector: (selector) => querySelector.call(element, selector)
  4668.               });
  4669.  
  4670.               cProto.animateScroll_ = function (a) {
  4671.                 // console.log('cProto.animateScroll_', tag) // yt-emoji-picker-renderer
  4672.                 if (!this.boundAnimateScroll39_) this.boundAnimateScroll39_ = this.animateScroll_.bind(this);
  4673.                 this.lastAnimationTime_ || (this.lastAnimationTime_ = a);
  4674.                 a -= this.lastAnimationTime_;
  4675.                 200 > a ? (U(this.hostElement).querySelector("#categories").scrollTop = this.animationStart_ + (this.animationEnd_ - this.animationStart_) * a / 200,
  4676.                   rafHub.request(this.boundAnimateScroll39_)) : (null != this.animationEnd_ && (U(this.hostElement).querySelector("#categories").scrollTop = this.animationEnd_),
  4677.                     this.animationEnd_ = this.animationStart_ = null,
  4678.                     this.lastAnimationTime_ = 0);
  4679.                 this.updateButtons_()
  4680.               }
  4681.  
  4682.               console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "OK")
  4683.             } else {
  4684.  
  4685.               console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "NG")
  4686.             }
  4687.  
  4688.           })();
  4689.  
  4690.           console.log("[End]");
  4691.  
  4692.           console.groupEnd();
  4693.         });
  4694.       }
  4695.  
  4696.       if (ENABLE_RAF_HACK_DOCKED_MESSAGE && rafHub !== null) {
  4697.  
  4698.  
  4699.         customElements.whenDefined("yt-live-chat-docked-message").then(() => {
  4700.  
  4701.           mightFirstCheckOnYtInit();
  4702.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-docked-message hacks");
  4703.           console.log("[Begin]");
  4704.           (() => {
  4705.  
  4706.             const tag = "yt-live-chat-docked-message"
  4707.             const dummy = document.createElement(tag);
  4708.  
  4709.             const cProto = getProto(dummy);
  4710.             if (!cProto || !cProto.attached) {
  4711.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4712.               return;
  4713.             }
  4714.  
  4715.             let doHack = false;
  4716.             if (typeof cProto.detached === 'function' && typeof cProto.checkIntersections === 'function' && typeof cProto.onDockableMessagesChanged === 'function' && typeof cProto.boundCheckIntersections === 'undefined') {
  4717.  
  4718.               // cancelable - this.intersectRAF <detached>
  4719.               // yt-live-chat-docked-message
  4720.               // boundCheckIntersections <-> checkIntersections
  4721.               // onDockableMessagesChanged
  4722.               //  this.intersectRAF = window.requestAnimationFrame(this.boundCheckIntersections);
  4723.  
  4724.               console.log('detached', typeof cProto.detached)
  4725.               console.log('checkIntersections', typeof cProto.checkIntersections)
  4726.               console.log('onDockableMessagesChanged', typeof cProto.onDockableMessagesChanged)
  4727.  
  4728.               doHack = fnIntegrity(cProto.detached, '0.32.22') && fnIntegrity(cProto.checkIntersections, '0.128.85') && fnIntegrity(cProto.onDockableMessagesChanged, '0.20.11')
  4729.  
  4730.             }
  4731.  
  4732.             if (doHack) {
  4733.  
  4734.               cProto.checkIntersections = function () {
  4735.                 // console.log('cProto.checkIntersections', tag)
  4736.                 if (this.dockableMessages.length) {
  4737.                   this.intersectRAF = rafHub.request(this.boundCheckIntersections);
  4738.                   let a = this.dockableMessages[0]
  4739.                     , b = this.hostElement.getBoundingClientRect();
  4740.                   a = a.getBoundingClientRect();
  4741.                   let c = a.top - b.top
  4742.                     , d = 8 >= c;
  4743.                   c = 8 >= c - this.hostElement.clientHeight;
  4744.                   if (d) {
  4745.                     let e;
  4746.                     for (; d;) {
  4747.                       e = this.dockableMessages.shift();
  4748.                       d = this.dockableMessages[0];
  4749.                       if (!d)
  4750.                         break;
  4751.                       d = d.getBoundingClientRect();
  4752.                       c = d.top - b.top;
  4753.                       let f = 8 >= c;
  4754.                       if (8 >= c - a.height)
  4755.                         if (f)
  4756.                           a = d;
  4757.                         else
  4758.                           return;
  4759.                       d = f
  4760.                     }
  4761.                     this.dock(e)
  4762.                   } else
  4763.                     c && this.dockedItem && this.clear()
  4764.                 } else
  4765.                   this.intersectRAF = 0
  4766.               }
  4767.  
  4768.               cProto.onDockableMessagesChanged = function () {
  4769.                 // console.log('cProto.onDockableMessagesChanged', tag) // yt-live-chat-docked-message
  4770.                 this.dockableMessages.length && !this.intersectRAF && (this.intersectRAF = rafHub.request(this.boundCheckIntersections))
  4771.               }
  4772.  
  4773.               cProto.detached = function () {
  4774.                 this.intersectRAF && rafHub.cancel(this.intersectRAF)
  4775.               }
  4776.  
  4777.               console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "OK")
  4778.             } else {
  4779.  
  4780.               console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "NG")
  4781.             }
  4782.  
  4783.           })();
  4784.  
  4785.           console.log("[End]");
  4786.  
  4787.           console.groupEnd();
  4788.  
  4789.         }).catch(console.warn);
  4790.  
  4791.       }
  4792.  
  4793.       if (FIX_SETSRC_AND_THUMBNAILCHANGE_) {
  4794.  
  4795.  
  4796.         customElements.whenDefined("yt-img-shadow").then(() => {
  4797.  
  4798.           mightFirstCheckOnYtInit();
  4799.           groupCollapsed("YouTube Super Fast Chat", " | yt-img-shadow hacks");
  4800.           console.log("[Begin]");
  4801.           (() => {
  4802.  
  4803.             const tag = "yt-img-shadow"
  4804.             const dummy = document.createElement(tag);
  4805.  
  4806.             const cProto = getProto(dummy);
  4807.             if (!cProto || !cProto.attached) {
  4808.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4809.               return;
  4810.             }
  4811.  
  4812.             if (typeof cProto.thumbnailChanged_ === 'function' && !cProto.thumbnailChanged66_) {
  4813.  
  4814.               cProto.thumbnailChanged66_ = cProto.thumbnailChanged_;
  4815.               cProto.thumbnailChanged_ = function (a) {
  4816.  
  4817.                 if (this.oldThumbnail_ && this.thumbnail && this.oldThumbnail_.thumbnails === this.thumbnail.thumbnails) return;
  4818.                 if (!this.oldThumbnail_ && !this.thumbnail) return;
  4819.  
  4820.                 return this.thumbnailChanged66_.apply(this, arguments)
  4821.  
  4822.               }
  4823.               console.log("cProto.thumbnailChanged_ - OK");
  4824.  
  4825.             } else {
  4826.               console.log("cProto.thumbnailChanged_ - NG");
  4827.  
  4828.             }
  4829.             if (typeof cProto.setSrc_ === 'function' && !cProto.setSrc66_) {
  4830.  
  4831.               cProto.setSrc66_ = cProto.setSrc_;
  4832.               cProto.setSrc_ = function (a) {
  4833.                 if ((((this || 0).$ || 0).img || 0).src === a) return;
  4834.                 return this.setSrc66_.apply(this, arguments)
  4835.               }
  4836.  
  4837.               console.log("cProto.setSrc_ - OK");
  4838.             } else {
  4839.  
  4840.               console.log("cProto.setSrc_ - NG");
  4841.             }
  4842.  
  4843.           })();
  4844.  
  4845.           console.log("[End]");
  4846.  
  4847.           console.groupEnd();
  4848.  
  4849.         }).catch(console.warn);
  4850.  
  4851.       }
  4852.  
  4853.       if (FIX_THUMBNAIL_DATACHANGED) {
  4854.  
  4855.  
  4856.  
  4857.         customElements.whenDefined("yt-live-chat-author-badge-renderer").then(() => {
  4858.  
  4859.           mightFirstCheckOnYtInit();
  4860.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-author-badge-renderer hacks");
  4861.           console.log("[Begin]");
  4862.           (() => {
  4863.  
  4864.             const tag = "yt-live-chat-author-badge-renderer"
  4865.             const dummy = document.createElement(tag);
  4866.  
  4867.             const cProto = getProto(dummy);
  4868.             if (!cProto || !cProto.attached) {
  4869.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4870.               return;
  4871.             }
  4872.  
  4873.  
  4874.             if (typeof cProto.dataChanged === 'function' && !cProto.dataChanged86 && fnIntegrity(cProto.dataChanged) === '1.159.97') {
  4875.  
  4876.  
  4877.  
  4878.               cProto.dataChanged86 = cProto.dataChanged;
  4879.               cProto.dataChanged = function (a) {
  4880.  
  4881.                 /*
  4882.  
  4883.                   for (var b = xC(Z(this.hostElement).querySelector("#image")); b.firstChild; )
  4884.                       b.removeChild(b.firstChild);
  4885.                   if (a)
  4886.                       if (a.icon) {
  4887.                           var c = document.createElement("yt-icon");
  4888.                           "MODERATOR" === a.icon.iconType && this.enableNewModeratorBadge ? (c.icon = "yt-sys-icons:shield-filled",
  4889.                           c.defaultToFilled = !0) : c.icon = "live-chat-badges:" + a.icon.iconType.toLowerCase();
  4890.                           b.appendChild(c)
  4891.                       } else if (a.customThumbnail) {
  4892.                           c = document.createElement("img");
  4893.                           var d;
  4894.                           (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null) ? (c.src = d,
  4895.                           b.appendChild(c),
  4896.                           c.setAttribute("alt", this.hostElement.ariaLabel || "")) : lq(new tm("Could not compute URL for thumbnail",a.customThumbnail))
  4897.                       }
  4898.  
  4899.                 */
  4900.  
  4901.                 const image = ((this || 0).$ || 0).image
  4902.                 if (image && a && image.firstElementChild) {
  4903.                   let exisiting = image.firstElementChild;
  4904.                   if (exisiting === image.lastElementChild) {
  4905.  
  4906.  
  4907.                     if (a.icon && exisiting.nodeName.toUpperCase() === 'YT-ICON') {
  4908.  
  4909.                       let c = exisiting;
  4910.                       if ("MODERATOR" === a.icon.iconType && this.enableNewModeratorBadge) {
  4911.                         if (c.icon !== "yt-sys-icons:shield-filled") c.icon = "yt-sys-icons:shield-filled";
  4912.                         if (c.defaultToFilled !== true) c.defaultToFilled = true;
  4913.                       } else {
  4914.                         let p = "live-chat-badges:" + a.icon.iconType.toLowerCase();;
  4915.                         if (c.icon !== p) c.icon = p;
  4916.                         if (c.defaultToFilled !== false) c.defaultToFilled = false;
  4917.                       }
  4918.                       return;
  4919.  
  4920.  
  4921.                     } else if (a.customThumbnail && exisiting.nodeName.toUpperCase() == 'IMG') {
  4922.  
  4923.                       let c = exisiting;
  4924.                       if (a.customThumbnail.thumbnails.map(e => e.url).includes(c.src)) {
  4925.  
  4926.                         c.setAttribute("alt", this.hostElement.ariaLabel || "");
  4927.                         return;
  4928.                       }
  4929.                       /*
  4930.  
  4931.                       var d;
  4932.                       (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null) ? (c.src = d,
  4933.  
  4934.  
  4935.                         c.setAttribute("alt", this.hostElement.ariaLabel || "")) : lq(new tm("Could not compute URL for thumbnail", a.customThumbnail))
  4936.                         */
  4937.                     }
  4938.  
  4939.  
  4940.                   }
  4941.                 }
  4942.                 return this.dataChanged86.apply(this, arguments)
  4943.  
  4944.               }
  4945.               console.log("cProto.dataChanged - OK");
  4946.  
  4947.             } else {
  4948.               assertor(() => fnIntegrity(cProto.dataChanged, '1.159.97'));
  4949.               console.log("cProto.dataChanged - NG");
  4950.  
  4951.             }
  4952.  
  4953.           })();
  4954.  
  4955.           console.log("[End]");
  4956.  
  4957.           console.groupEnd();
  4958.  
  4959.         }).catch(console.warn);
  4960.  
  4961.  
  4962.       }
  4963.  
  4964.  
  4965.       if (FIX_TOOLTIP_DISPLAY) {
  4966.  
  4967.  
  4968.         customElements.whenDefined("tp-yt-paper-tooltip").then(() => {
  4969.  
  4970.           mightFirstCheckOnYtInit();
  4971.           groupCollapsed("YouTube Super Fast Chat", " | tp-yt-paper-tooltip hacks");
  4972.           console.log("[Begin]");
  4973.           (() => {
  4974.  
  4975.             const tag = "tp-yt-paper-tooltip"
  4976.             const dummy = document.createElement(tag);
  4977.  
  4978.             const cProto = getProto(dummy);
  4979.             if (!cProto || !cProto.attached) {
  4980.               console.warn(`proto.attached for ${tag} is unavailable.`);
  4981.               return;
  4982.             }
  4983.  
  4984.             if (typeof cProto.attached === 'function' && typeof cProto.detached === 'function' && cProto._readyClients && cProto._attachDom && cProto.ready && !cProto._readyClients43) {
  4985.  
  4986.               cProto._readyClients43 = cProto._readyClients;
  4987.               cProto._readyClients = function () {
  4988.                 let r = cProto._readyClients43.apply(this, arguments);
  4989.                 if (this.$ && this.$$ && this.$.tooltip) this.root = null; // fix this.root = null != (b = a.root) ? b : this.host
  4990.                 return r;
  4991.               }
  4992.  
  4993.               console.log("_readyClients - OK");
  4994.  
  4995.             } else {
  4996.               console.log("_readyClients - NG");
  4997.  
  4998.             }
  4999.  
  5000.  
  5001.           })();
  5002.  
  5003.           console.log("[End]");
  5004.  
  5005.           console.groupEnd();
  5006.  
  5007.         }).catch(console.warn);
  5008.  
  5009.  
  5010.  
  5011.       }
  5012.  
  5013.  
  5014.  
  5015.       if (FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK) {
  5016.  
  5017.  
  5018.         const hookDocumentMouseDownSetupFn = () => {
  5019.  
  5020.  
  5021.  
  5022.           let muzTimestamp = 0;
  5023.           let nszDropdown = null;
  5024.  
  5025.  
  5026.  
  5027.           const handlerObject = {
  5028.  
  5029.             // mdHandler282 : function (evt) {
  5030.             //   // console.log(evt, 1, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
  5031.             //   if (!evt || !evt.isTrusted) return;
  5032.             //   muzTimestamp = 0;
  5033.             //   nszDropdown = null;
  5034.  
  5035.             //   const hostElement = this.hostElement || this;
  5036.             //   if (!evt || !evt.isTrusted || !hostElement.hasAttribute('menu-visible')) return;
  5037.             //   if (!hostElement.contains(evt.target)) return;
  5038.             //   let targetDropDown = null;
  5039.             //   for(const dropdown of document.querySelectorAll('tp-yt-iron-dropdown.style-scope.yt-live-chat-app')){
  5040.             //     if(dropdown && dropdown.positionTarget && hostElement.contains( dropdown.positionTarget)){
  5041.             //       targetDropDown = dropdown;
  5042.             //     }
  5043.             //   }
  5044.             //   if ((nszDropdown = targetDropDown)) {
  5045.             //     muzTimestamp = Date.now();
  5046.             //     evt.stopImmediatePropagation();
  5047.             //     evt.stopPropagation();
  5048.             //   }
  5049.  
  5050.             // },
  5051.  
  5052.  
  5053.             muHandler282: function (evt) {
  5054.               // console.log(evt, 7, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
  5055.               if (!evt || !evt.isTrusted || !muzTimestamp) return;
  5056.               const dropdown = nszDropdown;
  5057.               muzTimestamp = 0;
  5058.               nszDropdown = null;
  5059.  
  5060.               const kurMPC = kRef(currentMenuPivotWR) || 0;
  5061.               const hostElement = kurMPC.hostElement || kurMPC;
  5062.               if (!hostElement.hasAttribute('menu-visible')) return;
  5063.               if (dropdown && dropdown.positionTarget && hostElement.contains(dropdown.positionTarget)) {
  5064.                 muzTimestamp = Date.now();
  5065.                 evt.stopImmediatePropagation();
  5066.                 evt.stopPropagation();
  5067.                 Promise.resolve(dropdown).then((dropdown) => {
  5068.                   dropdown.cancel();
  5069.                 });
  5070.                 // document.body.click();
  5071.               }
  5072.  
  5073.             },
  5074.  
  5075.             mlHandler282: function (evt) {
  5076.               muzTimestamp = 0;
  5077.               nszDropdown = null;
  5078.             },
  5079.  
  5080.             ckHandler282: function (evt) {
  5081.               // console.log(evt, 3, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
  5082.  
  5083.               if (!evt || !evt.isTrusted || !muzTimestamp) return;
  5084.               if (Date.now() - muzTimestamp < 40) {
  5085.                 muzTimestamp = Date.now();
  5086.                 evt.stopImmediatePropagation();
  5087.                 evt.stopPropagation();
  5088.               }
  5089.  
  5090.             },
  5091.  
  5092.             tapHandler282: function (evt) {
  5093.               // console.log(evt, 2, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
  5094.  
  5095.               if (!evt || !evt.isTrusted || !muzTimestamp) return;
  5096.               if (Date.now() - muzTimestamp < 40) {
  5097.                 muzTimestamp = Date.now();
  5098.                 evt.stopImmediatePropagation();
  5099.                 evt.stopPropagation();
  5100.               }
  5101.  
  5102.             },
  5103.  
  5104.  
  5105.             handleEvent(evt) {
  5106.  
  5107.  
  5108.               if (evt) {
  5109.                 const kurMPC = kRef(currentMenuPivotWR) || 0;
  5110.                 const cnt = kurMPC.inst || kurMPC;
  5111.                 const hostElement = cnt.hostElement || cnt;
  5112.                 if (!cnt || cnt.isAttached !== true || hostElement.isConnected !== true) return;
  5113.                 switch (evt.type) {
  5114.                   // case 'mousedown':
  5115.                   // return this.mdHandler282.call(kurMPC, evt);
  5116.                   case 'mouseup':
  5117.                     return this.muHandler282(evt);
  5118.                   case 'mouseleave':
  5119.                     return this.mlHandler282(evt);
  5120.                   case 'tap':
  5121.                     return this.tapHandler282(evt);
  5122.                   case 'click':
  5123.                     return this.ckHandler282(evt);
  5124.                 }
  5125.               }
  5126.  
  5127.             }
  5128.  
  5129.  
  5130.  
  5131.           }
  5132.  
  5133.           document.addEventListener('mousedown', function (evt) {
  5134.  
  5135.             if (!evt || !evt.isTrusted || !evt.target) return;
  5136.             muzTimestamp = 0;
  5137.             nszDropdown = null;
  5138.  
  5139.             /** @type {HTMLElement | null} */
  5140.             const kurMP = kRef(currentMenuPivotWR);
  5141.             if (!kurMP) return;
  5142.             const kurMPC = kurMP.closest('[menu-visible]') || 0;
  5143.  
  5144.             if (!kurMPC.isClickableChatRow111 || !kurMPC.isClickableChatRow111() || !kurMPC.contains(evt.target)) return;
  5145.  
  5146.             let targetDropDown = null;
  5147.             for (const dropdown of document.querySelectorAll('tp-yt-iron-dropdown.style-scope.yt-live-chat-app')) {
  5148.               if (dropdown && dropdown.positionTarget === kurMP) {
  5149.                 targetDropDown = dropdown;
  5150.               }
  5151.             }
  5152.  
  5153.             if ((nszDropdown = targetDropDown)) {
  5154.               muzTimestamp = Date.now();
  5155.               evt.stopImmediatePropagation();
  5156.               evt.stopPropagation();
  5157.               currentMenuPivotWR = mWeakRef(kurMPC);
  5158.  
  5159.               const listenOpts = { capture: true, passive: false, once: true };
  5160.  
  5161.               // remove unexcecuted eventHandler
  5162.               document.removeEventListener('mouseup', handlerObject, listenOpts);
  5163.               document.removeEventListener('mouseleave', handlerObject, listenOpts);
  5164.               document.removeEventListener('tap', handlerObject, listenOpts);
  5165.               document.removeEventListener('click', handlerObject, listenOpts);
  5166.  
  5167.               // inject one time eventHandler to by pass events
  5168.               document.addEventListener('mouseup', handlerObject, listenOpts);
  5169.               document.addEventListener('mouseleave', handlerObject, listenOpts);
  5170.               document.addEventListener('tap', handlerObject, listenOpts);
  5171.               document.addEventListener('click', handlerObject, listenOpts);
  5172.  
  5173.             }
  5174.  
  5175.           }, true);
  5176.  
  5177.         }
  5178.  
  5179.  
  5180.         customElements.whenDefined('yt-live-chat-text-message-renderer').then(() => {
  5181.  
  5182.  
  5183.           mightFirstCheckOnYtInit();
  5184.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-text-message-renderer hacks");
  5185.           console.log("[Begin]");
  5186.           (() => {
  5187.  
  5188.             const tag = "yt-live-chat-text-message-renderer"
  5189.             const dummy = document.createElement(tag);
  5190.  
  5191.             const cProto = getProto(dummy);
  5192.             if (!cProto || !cProto.attached) {
  5193.               console.warn(`proto.attached for ${tag} is unavailable.`);
  5194.               return;
  5195.             }
  5196.  
  5197.             /*
  5198.  
  5199.  
  5200.  
  5201.                 remarks:
  5202.                             
  5203.                 const w=new Set();
  5204.                 setInterval(()=>{
  5205.                 for(const a of document.getElementsByTagName('*')) if(a.shouldSupportWholeItemClick) w.add(a.is||''); 
  5206.                 console.log([...w.keys()]);
  5207.                 },800);
  5208.  
  5209.                             
  5210.                 [
  5211.                 "yt-live-chat-ticker-sponsor-item-renderer",
  5212.                 "yt-live-chat-banner-header-renderer",
  5213.                 "yt-live-chat-text-message-renderer",
  5214.                 "ytd-sponsorships-live-chat-gift-purchase-announcement-renderer",
  5215.                 "ytd-sponsorships-live-chat-header-renderer",
  5216.                 "ytd-sponsorships-live-chat-gift-redemption-announcement-renderer"
  5217.                 ]
  5218.               
  5219.             */
  5220.  
  5221.             cProto.isClickableChatRow111 = function () {
  5222.               return (
  5223.                 this.data && typeof this.shouldSupportWholeItemClick === 'function' && typeof this.hasModerationOverlayVisible === 'function' &&
  5224.                 this.data.contextMenuEndpoint && this.wholeMessageClickable && this.shouldSupportWholeItemClick() && !this.hasModerationOverlayVisible()
  5225.               ); // follow .onItemTap(a)
  5226.             }
  5227.  
  5228.  
  5229.  
  5230.             const toHookDocumentMouseDown = typeof cProto.shouldSupportWholeItemClick === 'function' && typeof cProto.hasModerationOverlayVisible === 'function';
  5231.  
  5232.             if (toHookDocumentMouseDown) {
  5233.  
  5234.               hookDocumentMouseDownSetupFn();
  5235.  
  5236.  
  5237.               console.log("FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK - Doc MouseEvent OK");
  5238.  
  5239.  
  5240.  
  5241.             } else {
  5242.  
  5243.               console.log("FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK - Doc MouseEvent NG");
  5244.  
  5245.             }
  5246.  
  5247.  
  5248.  
  5249.  
  5250.           })();
  5251.  
  5252.           console.log("[End]");
  5253.  
  5254.           console.groupEnd();
  5255.  
  5256.         }).catch(console.warn);
  5257.  
  5258.  
  5259.       }
  5260.  
  5261.  
  5262.  
  5263.       if (CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN) {
  5264.  
  5265.  
  5266.         /*
  5267.  
  5268.         const w=new Set(); for(const a of document.getElementsByTagName('*')) if(a.showContextMenu && a.showContextMenu_) w.add(a.is||''); console.log([...w.keys()])
  5269.  
  5270.         */
  5271.  
  5272.         let pTags = [];
  5273.         const sTags = [
  5274.           "yt-live-chat-ticker-sponsor-item-renderer",
  5275.           "yt-live-chat-banner-header-renderer",
  5276.           "yt-live-chat-text-message-renderer",
  5277.           "ytd-sponsorships-live-chat-gift-purchase-announcement-renderer",
  5278.           "ytd-sponsorships-live-chat-header-renderer",
  5279.           "ytd-sponsorships-live-chat-gift-redemption-announcement-renderer"
  5280.         ];
  5281.  
  5282.         for (const tag of sTags) {
  5283.           pTags.push(customElements.whenDefined(tag));
  5284.         }
  5285.  
  5286.  
  5287.         Promise.all(pTags).then(() => {
  5288.  
  5289.  
  5290.           mightFirstCheckOnYtInit();
  5291.           groupCollapsed("YouTube Super Fast Chat", " | fixShowContextMenu");
  5292.           console.log("[Begin]");
  5293.  
  5294.           for (const tag of sTags) {
  5295.  
  5296.  
  5297.  
  5298.             (() => {
  5299.  
  5300.               const dummy = document.createElement(tag);
  5301.  
  5302.               const cProto = getProto(dummy);
  5303.               if (!cProto || !cProto.attached) {
  5304.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  5305.                 return;
  5306.               }
  5307.  
  5308.  
  5309.  
  5310.  
  5311.               if (typeof cProto.showContextMenu === 'function' && typeof cProto.showContextMenu_ === 'function' && !cProto.showContextMenu37 && !cProto.showContextMenu37_ && cProto.showContextMenu.length === 1 && cProto.showContextMenu_.length === 1) {
  5312.  
  5313.                 cProto.showContextMenu37_ = cProto.showContextMenu_;
  5314.                 cProto.showContextMenu37 = cProto.showContextMenu;
  5315.     
  5316.                 function deepCopy(obj, skipKeys) {
  5317.                   skipKeys = skipKeys || [];
  5318.                   if (!obj || typeof obj !== 'object') return obj;
  5319.                   if (Array.isArray(obj)) {
  5320.                     return obj.map(item => deepCopy(item, skipKeys));
  5321.                   }
  5322.                   const copy = {};
  5323.                   for (let key in obj) {
  5324.                     if (!skipKeys.includes(key)) {
  5325.                       copy[key] = deepCopy(obj[key], skipKeys);
  5326.                     }
  5327.                   }
  5328.                   return copy;
  5329.                 }
  5330.     
  5331.                 const wm37 = new WeakMap();
  5332.                 cProto.showContextMenu = function (a) {
  5333.                   const endpoint = (this.data || 0).contextMenuEndpoint || 0;
  5334.                   if (endpoint) {
  5335.                     let resolvedEndpoint = wm37.get(endpoint);
  5336.                     if (resolvedEndpoint) {
  5337.                       resolvedEndpoint = deepCopy(resolvedEndpoint);
  5338.                       // let b = deepCopy(resolvedEndpoint, ['trackingParams', 'clickTrackingParams'])
  5339.                       Promise.resolve(resolvedEndpoint).then(() => {
  5340.                         this.showContextMenu37_(resolvedEndpoint);
  5341.                       });
  5342.                       return;
  5343.                       //this.showContextMenu37_(JSON.parse(JSON.stringify(a)));
  5344.                       //return;
  5345.                     }
  5346.                   }
  5347.                   return this.showContextMenu37(a);
  5348.                 }
  5349.     
  5350.                 cProto.showContextMenu_ = function (a) {
  5351.                   const endpoint = (this.data || 0).contextMenuEndpoint || 0;
  5352.                   if (endpoint) {
  5353.                     a = deepCopy(a);
  5354.                     wm37.set(endpoint, a);
  5355.                   }
  5356.                   return this.showContextMenu37_(a);
  5357.                 }
  5358.     
  5359.     
  5360.                 console.log("CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN - OK", tag);
  5361.     
  5362.     
  5363.     
  5364.               } else {
  5365.     
  5366.                 console.log("CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN -  NG", tag);
  5367.     
  5368.               }
  5369.  
  5370.  
  5371.             })();
  5372.  
  5373.           }
  5374.  
  5375.  
  5376.  
  5377.           console.log("[End]");
  5378.  
  5379.           console.groupEnd();
  5380.  
  5381.         }).catch(console.warn);
  5382.       }
  5383.  
  5384.  
  5385.       customElements.whenDefined('tp-yt-iron-dropdown').then(() => {
  5386.  
  5387.         mightFirstCheckOnYtInit();
  5388.         groupCollapsed("YouTube Super Fast Chat", " | tp-yt-iron-dropdown hacks");
  5389.         console.log("[Begin]");
  5390.         (() => {
  5391.  
  5392.           const tag = "tp-yt-iron-dropdown";
  5393.           const dummy = document.createElement(tag);
  5394.  
  5395.           const cProto = getProto(dummy);
  5396.           if (!cProto || !cProto.attached) {
  5397.             console.warn(`proto.attached for ${tag} is unavailable.`);
  5398.             return;
  5399.           }
  5400.  
  5401.  
  5402.           if (USE_VANILLA_DEREF && typeof cProto.__deraf === 'function' && cProto.__deraf.length === 2 && !cProto.__deraf34 && fnIntegrity(cProto.__deraf) === '2.42.24') {
  5403.             cProto.__deraf_hn__ = function (sId, fn) {
  5404.               const rhKey = `_rafHandler_${sId}`;
  5405.               const m = this[rhKey] || (this[rhKey] = new WeakMap());
  5406.               if (m.has(fn)) return m.get(fn);
  5407.               const resFn = () => {
  5408.                 this.__rafs[sId] = null;
  5409.                 fn.call(this)
  5410.               };
  5411.               m.set(fn, resFn);
  5412.               m.set(resFn, resFn);
  5413.               return resFn;
  5414.             };
  5415.             cProto.__deraf34 = cProto.__deraf;
  5416.             cProto.__deraf = function (a, b) { // sId, fn
  5417.               let c = this.__rafs;
  5418.               null !== c[a] && cancelAnimationFrame(c[a]);
  5419.               c[a] = requestAnimationFrame(this.__deraf_hn__(a, b));
  5420.             };
  5421.             console.log("USE_VANILLA_DEREF - OK");
  5422.           } else {
  5423.             console.log("USE_VANILLA_DEREF - NG");
  5424.           }
  5425.  
  5426.           if (FIX_DROPDOWN_DERAF && typeof cProto.__deraf === 'function' && cProto.__deraf.length === 2 && !cProto.__deraf66) {
  5427.             cProto.__deraf66 = cProto.__deraf;
  5428.             cProto.__deraf = function (sId, fn) {
  5429.               if (this.__byPassRAF__) {
  5430.                 Promise.resolve().then(() => {
  5431.                   fn.call(this);
  5432.                 });
  5433.               }
  5434.               let r = this.__deraf66.apply(this, arguments);
  5435.               return r;
  5436.             }
  5437.             console.log("FIX_DROPDOWN_DERAF - OK");
  5438.           } else {
  5439.             console.log("FIX_DROPDOWN_DERAF - NG");
  5440.           }
  5441.  
  5442.  
  5443.           if (FIX_MENU_REOPEN_RENDER_PERFORMANCE_1 && typeof cProto.__openedChanged === 'function' && !cProto.__mtChanged__ && fnIntegrity(cProto.__openedChanged) === '0.46.20') {
  5444.  
  5445.             let lastClose = null;
  5446.             let lastOpen = null;
  5447.             let cid = 0;
  5448.  
  5449.             cProto.__mtChanged__ = function (b) {
  5450.  
  5451.               Promise.resolve().then(() => {
  5452.                 this._applyFocus();
  5453.               }).then(() => {
  5454.                 b ? this._renderOpened() : this._renderClosed();
  5455.               }).catch(console.warn);
  5456.  
  5457.             };
  5458.  
  5459.             const __moChanged__ = () => {
  5460.               if (!cid) return;
  5461.               // console.log(553, !!lastOpen, !!lastClose);
  5462.               cid = 0;
  5463.               if (lastOpen && !lastClose && lastOpen.isAttached) {
  5464.                 lastOpen.__mtChanged__(1)
  5465.               } else if (lastClose && !lastOpen && lastClose.isAttached) {
  5466.                 lastClose.__mtChanged__(0);
  5467.               }
  5468.               lastOpen = null;
  5469.               lastClose = null;
  5470.             };
  5471.  
  5472.  
  5473.             if (typeof cProto._openedChanged === 'function' && !cProto._openedChanged66) {
  5474.               cProto._openedChanged66 = cProto._openedChanged;
  5475.               cProto._openedChanged = function () {
  5476.                 // this.__byPassRAF__ = !lastOpen ? true : false; // or just true?
  5477.                 this.__byPassRAF__ = true;
  5478.                 let r = this._openedChanged66.apply(this, arguments);
  5479.                 this.__byPassRAF__ = false;
  5480.                 return r;
  5481.               }
  5482.             }
  5483.  
  5484.             const pSetGet = (key, pdThis, pdBase) => {
  5485.               // note: this is not really a standard way for the getOwnPropertyDescriptors; but it is sufficient to make the job done
  5486.               return {
  5487.                 get: (pdThis[key] || 0).get || (pdBase[key] || 0).get,
  5488.                 set: (pdThis[key] || 0).set || (pdBase[key] || 0).set
  5489.               };
  5490.             };
  5491.  
  5492.             cProto.__modifiedMenuPropsFn__ = function () {
  5493.               const pdThis = Object.getOwnPropertyDescriptors(this.constructor.prototype)
  5494.               const pdBase = Object.getOwnPropertyDescriptors(this)
  5495.  
  5496.               const pdAutoFitOnAttach = pSetGet('autoFitOnAttach', pdThis, pdBase);
  5497.               const pdExpandSizingTargetForScrollbars = pSetGet('expandSizingTargetForScrollbars', pdThis, pdBase);
  5498.               const pdAllowOutsideScroll = pSetGet('allowOutsideScroll', pdThis, pdBase);
  5499.  
  5500.               if (pdAutoFitOnAttach.get || pdAutoFitOnAttach.set) {
  5501.                 console.warn('there is setter/getter for autoFitOnAttach');
  5502.                 return;
  5503.               }
  5504.               if (pdExpandSizingTargetForScrollbars.get || pdExpandSizingTargetForScrollbars.set) {
  5505.                 console.warn('there is setter/getter for expandSizingTargetForScrollbars');
  5506.                 return;
  5507.               }
  5508.               if (!pdAllowOutsideScroll.get || !pdAllowOutsideScroll.set) {
  5509.                 console.warn('there is NO setter-getter for allowOutsideScroll');
  5510.                 return;
  5511.               }
  5512.  
  5513.               let { autoFitOnAttach, expandSizingTargetForScrollbars, allowOutsideScroll } = this;
  5514.  
  5515.               this.__AllowOutsideScrollPD__ = pdAllowOutsideScroll;
  5516.  
  5517.               const fitEnable = CHAT_MENU_REFIT_ALONG_SCROLLING === 2;
  5518.  
  5519.               Object.defineProperties(this, {
  5520.                 autoFitOnAttach: {
  5521.                   get() {
  5522.                     if (fitEnable && this._modifiedMenuPropOn062__) return true;
  5523.                     return autoFitOnAttach;
  5524.                   },
  5525.                   set(nv) {
  5526.                     autoFitOnAttach = nv;
  5527.                     return true;
  5528.                   },
  5529.                   enumerable: true,
  5530.                   configurable: true
  5531.                 }, expandSizingTargetForScrollbars: {
  5532.                   get() {
  5533.                     if (fitEnable && this._modifiedMenuPropOn062__) return true;
  5534.                     return expandSizingTargetForScrollbars;
  5535.                   },
  5536.                   set(nv) {
  5537.                     expandSizingTargetForScrollbars = nv;
  5538.                     return true;
  5539.                   },
  5540.                   enumerable: true,
  5541.                   configurable: true
  5542.                 }, allowOutsideScroll: {
  5543.                   get() {
  5544.                     if (this._modifiedMenuPropOn062__) return true;
  5545.                     return allowOutsideScroll;
  5546.                   },
  5547.                   set(nv) {
  5548.                     allowOutsideScroll = nv;
  5549.                     this.__AllowOutsideScrollPD__.set.call(this, nv);
  5550.                     return true;
  5551.                   },
  5552.                   enumerable: true,
  5553.                   configurable: true
  5554.                 }
  5555.               })
  5556.             };
  5557.  
  5558.             /*
  5559.                // ***** position() to be changed. *****
  5560.               tp-yt-iron-dropdown[class], tp-yt-iron-dropdown[class] #contentWrapper, tp-yt-iron-dropdown[class] ytd-menu-popup-renderer[class] {
  5561.  
  5562.                   overflow: visible !important;
  5563.                   min-width: max-content !important;
  5564.                   max-width: max-content !important;
  5565.                   max-height: max-content !important;
  5566.                   min-height: max-content !important;
  5567.                   white-space: nowrap;
  5568.               }
  5569.  
  5570.             */
  5571.             if (FIX_MENU_POSITION_N_SIZING_ON_SHOWN && typeof cProto.position === 'function' && !cProto.position34 && typeof cProto.refit === 'function') {
  5572.  
  5573.               let m34 = 0;
  5574.               cProto.__refitByPosition__ = function () {
  5575.                 m34++;
  5576.                 if (m34 <= 0) m34 = 0;
  5577.                 if (m34 !== 1) return;
  5578.                 const hostElement = this.hostElement || this;
  5579.                 if (document.visibilityState === 'visible') {
  5580.                   const sizingTarget = this.sizingTarget;
  5581.                   if (!sizingTarget) {
  5582.                     m34 = 0;
  5583.                     return;
  5584.                   }
  5585.  
  5586.                   let useVisibilityCollapse = true;
  5587.                   if (HTMLElement.prototype.querySelector.call(sizingTarget, 'yt-icon:empty')) {
  5588.                     useVisibilityCollapse = false;
  5589.                   }
  5590.  
  5591.                   if (useVisibilityCollapse) {
  5592.                     hostElement.style.visibility = 'collapse';
  5593.                     sizingTarget.style.visibility = 'collapse';
  5594.                   } else {
  5595.                     hostElement.setAttribute('rNgzQ', '');
  5596.                     sizingTarget.setAttribute('rNgzQ', '');
  5597.                   }
  5598.  
  5599.                   const gn = () => {
  5600.  
  5601.                     if (useVisibilityCollapse) {
  5602.                       hostElement.style.visibility = '';
  5603.                       sizingTarget.style.visibility = '';
  5604.                     } else {
  5605.                       hostElement.removeAttribute('rNgzQ');
  5606.                       sizingTarget.removeAttribute('rNgzQ');
  5607.                     }
  5608.                   }
  5609.  
  5610.                   const an = async () => {
  5611.                     while (m34 >= 1) {
  5612.                       await renderReadyPn(sizingTarget);
  5613.                       if (this.opened && this.isAttached && sizingTarget.isConnected === true && sizingTarget === this.sizingTarget) {
  5614.                         if (sizingTarget.matches('ytd-menu-popup-renderer[slot="dropdown-content"].yt-live-chat-app')) this.refit();
  5615.                       }
  5616.                       m34--;
  5617.                     }
  5618.                     m34 = 0;
  5619.                     Promise.resolve().then(gn);
  5620.                   }
  5621.                   setTimeout(an, 4); // wait those resizing function calls
  5622.  
  5623.  
  5624.                 } else {
  5625.                   m34 = 0;
  5626.                 }
  5627.               }
  5628.               cProto.position34 = cProto.position
  5629.               cProto.position = function () {
  5630.                 if (this._positionInitialize_) {
  5631.                   this._positionInitialize_ = 0;
  5632.                   this.__refitByPosition__();
  5633.                 }
  5634.                 let r = cProto.position34.apply(this, arguments);
  5635.                 return r;
  5636.               }
  5637.               console.log("FIX_MENU_POSITION_ON_SHOWN - OK");
  5638.  
  5639.             } else {
  5640.  
  5641.               console.log("FIX_MENU_POSITION_ON_SHOWN - NG");
  5642.  
  5643.             }
  5644.  
  5645.  
  5646.  
  5647.             cProto.__openedChanged = function () {
  5648.               this._positionInitialize_ = 1;
  5649.               // this.removeAttribute('horizontal-align')
  5650.               // this.removeAttribute('vertical-align')
  5651.               if (typeof this.__menuTypeCheck__ !== 'boolean') {
  5652.                 this.__menuTypeCheck__ = true;
  5653.                 if (CHAT_MENU_SCROLL_UNLOCKING) {
  5654.                   this._modifiedMenuPropOn062__ = false;
  5655.                   // console.log(513, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
  5656.                   // this.autoFitOnAttach = true;
  5657.                   // this.expandSizingTargetForScrollbars = true;
  5658.                   // this.allowOutsideScroll = true;
  5659.                   // console.log(519,Object.getOwnPropertyDescriptors(this.constructor.prototype))
  5660.                   this.__modifiedMenuPropsFn__();
  5661.                   // this.constrain= function(){}
  5662.                   // this.position= function(){}
  5663.  
  5664.                   // this.autoFitOnAttach = true;
  5665.                   // this.expandSizingTargetForScrollbars = true;
  5666.                   // this.allowOutsideScroll = true;
  5667.                 }
  5668.               }
  5669.               if (CHAT_MENU_SCROLL_UNLOCKING && this.opened) {
  5670.                 let newValue = null;
  5671.                 const positionTarget = this.positionTarget;
  5672.                 if (positionTarget && positionTarget.classList.contains('yt-live-chat-text-message-renderer')) {
  5673.                   if (this._modifiedMenuPropOn062__ === false) {
  5674.                     newValue = true;
  5675.                   }
  5676.                 } else if (this._modifiedMenuPropOn062__ === true) {
  5677.                   newValue = false;
  5678.                 }
  5679.                 if (newValue !== null) {
  5680.                   const beforeAllowOutsideScroll = this.allowOutsideScroll;
  5681.                   this._modifiedMenuPropOn062__ = newValue;
  5682.                   const afterAllowOutsideScroll = this.allowOutsideScroll;
  5683.                   if (beforeAllowOutsideScroll !== afterAllowOutsideScroll) this.__AllowOutsideScrollPD__.set.call(this, afterAllowOutsideScroll);
  5684.                 }
  5685.               }
  5686.  
  5687.               if (this.opened) {
  5688.  
  5689.                 Promise.resolve().then(() => {
  5690.  
  5691.                   this._prepareRenderOpened();
  5692.                 }).then(() => {
  5693.                   this._manager.addOverlay(this);
  5694.                   if (this._manager._overlays.length === 1) {
  5695.                     lastOpen = this;
  5696.                     lastClose = null;
  5697.                   } else {
  5698.                     return 1;
  5699.                   }
  5700.                   // if (cid) {
  5701.                   //   clearTimeout(cid);
  5702.                   //   cid = -1;
  5703.                   //   this.__moChanged__();
  5704.                   //   cid = 0;
  5705.                   // } else {
  5706.                   //   cid = -1;
  5707.                   //   this.__moChanged__();
  5708.                   //   cid = 0;
  5709.                   // }
  5710.                   // cid = cid > 0 ? clearTimeout(cid) : 0;
  5711.                   // console.log(580, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
  5712.                   // cid = cid || setTimeout(__moChanged__, delay1);
  5713.                   cid = cid || requestAnimationFrame(__moChanged__);
  5714.                 }).then((r) => {
  5715.  
  5716.                   if (r) this.__mtChanged__(1);
  5717.                 }).catch(console.warn);
  5718.  
  5719.               } else {
  5720.                 Promise.resolve().then(() => {
  5721.                   this._manager.removeOverlay(this);
  5722.                   if (this._manager._overlays.length === 0) {
  5723.                     lastClose = this;
  5724.                     lastOpen = null;
  5725.                   } else {
  5726.                     return 1;
  5727.                   }
  5728.                   // cid = cid > 0 ? clearTimeout(cid) : 0;
  5729.                   // console.log(581, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
  5730.                   // cid = cid || setTimeout(__moChanged__, delay1);
  5731.                   cid = cid || requestAnimationFrame(__moChanged__);
  5732.                 }).then((r) => {
  5733.                   if (r) this.__mtChanged__(0);
  5734.                 }).catch(console.warn);
  5735.  
  5736.               }
  5737.  
  5738.             }
  5739.             console.log("FIX_MENU_REOPEN_RENDER_PERFORMANCE_1 - OK");
  5740.  
  5741.           } else {
  5742.  
  5743.             assertor(() => fnIntegrity(cProto.__openedChanged, '0.46.20'));
  5744.             console.log("FIX_MENU_REOPEN_RENDER_PERFORMANC_1 - NG");
  5745.  
  5746.           }
  5747.  
  5748.  
  5749.           if (FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK && typeof cProto.__openedChanged === 'function' && !cProto.__openedChanged82) {
  5750.  
  5751.             cProto.__openedChanged82 = cProto.__openedChanged;
  5752.  
  5753.  
  5754.             cProto.__openedChanged = function () {
  5755.  
  5756.               // currentMenuPivotWR = null;
  5757.               // console.log(1480, '__openedChanged.A', this.positionTarget)
  5758.  
  5759.  
  5760.  
  5761.               // if (this.opened && this.positionTarget) {
  5762.  
  5763.               //   const positionTarget = this.positionTarget;
  5764.               //   console.log(1480, '__openedChanged.B', positionTarget)
  5765.               //   currentMenuPivotWR = mWeakRef(positionTarget);
  5766.  
  5767.               // }
  5768.  
  5769.               const positionTarget = this.positionTarget;
  5770.               currentMenuPivotWR = positionTarget ? mWeakRef(positionTarget) : null;
  5771.               return this.__openedChanged82.apply(this, arguments);
  5772.             }
  5773.           }
  5774.  
  5775.  
  5776.           // if(FIX_MENU_CAPTURE_SCROLL && typeof cProto.__onCaptureScroll === 'function' && !cProto.__onCaptureScroll66){
  5777.  
  5778.           //   cProto.__onCaptureScroll66 = cProto.__onCaptureScroll;
  5779.  
  5780.           //   cProto.__onCaptureScroll = function(a){
  5781.  
  5782.           //     const q = true;
  5783.           //     if(this.scrollAction === 'lock'  && q && this.opened){
  5784.  
  5785.           //       // console.log(9107, this.scrollAction, this.__isAnimating, this.opened, a); // lock; __isAnimating = false
  5786.           //       async function af() {
  5787.           //         this.__isAnimating && this._finishRenderOpened();
  5788.           //         if (!this.opened) return;
  5789.           //         this.__restoreScrollPosition();
  5790.           //         await new Promise(r => requestAnimationFrame(r));
  5791.           //         if (!this.opened) return;
  5792.           //         this.opened && this.__isAnimating && this._finishRenderOpened();
  5793.           //         if (!this.opened) return;
  5794.           //         this.__restoreScrollPosition();
  5795.           //         await new Promise(r => requestAnimationFrame(r));
  5796.           //         if (!this.opened) return;
  5797.           //         this.opened && this.__isAnimating && this._finishRenderOpened();
  5798.           //         if (!this.opened) return;
  5799.           //         this.opened && !this.__isAnimating && this.refit();
  5800.           //       }
  5801.           //       Promise.resolve().then(af);
  5802.  
  5803.           //        return cProto.__onCaptureScroll66.apply(this, arguments);
  5804.           //     }else{
  5805.  
  5806.           //       // console.log(9102, this.scrollAction, this.__isAnimating, this.opened, a); // lock
  5807.  
  5808.           //       return cProto.__onCaptureScroll66.apply(this, arguments);
  5809.           //     }
  5810.           //   }
  5811.           //   console.log("FIX_MENU_CAPTURE_SCROLL - OK");
  5812.           // }else{
  5813.           //   console.log("FIX_MENU_CAPTURE_SCROLL - NG");
  5814.  
  5815.           // }
  5816.  
  5817.  
  5818.         })();
  5819.  
  5820.         console.log("[End]");
  5821.  
  5822.         console.groupEnd();
  5823.  
  5824.       }).catch(console.warn);
  5825.  
  5826.  
  5827.  
  5828.  
  5829.     }
  5830.  
  5831.     promiseForCustomYtElementsReady.then(onRegistryReadyForDOMOperations);
  5832.  
  5833.  
  5834.  
  5835.  
  5836.  
  5837.   });
  5838.  
  5839. })({ IntersectionObserver });