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YouTube 超快聊天

YouTube直播聊天的终极性能提升

当前为 2023-07-27 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name                YouTube Super Fast Chat
  3. // @version             0.20.1
  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 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 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 25 latest messages then incrementally added back to 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_FULL_RENDER_REQUIRED_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.   const DO_PARTICIPANT_LIST_HACKS = true;                     // TRUE for the majority
  74.   const SHOW_PARTICIPANT_CHANGES_IN_CONSOLE = false;          // Just too annoying to show them all in popular chat
  75.   const CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = true;  // Only consider changes in renderable content (not concerned with the last chat message of the participants)
  76.  
  77.  
  78.   const { IntersectionObserver } = __CONTEXT__;
  79.  
  80.   /** @type {globalThis.PromiseConstructor} */
  81.   const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  82.  
  83.   if (!IntersectionObserver) return console.warn("Your browser does not support IntersectionObserver.\nPlease upgrade to the latest version.")
  84.  
  85.   // necessity of cssText3_smooth_transform_position to be checked.
  86.   const cssText3_smooth_transform_position = ENABLE_NO_SMOOTH_TRANSFORM ? `
  87.  
  88.     #item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer {
  89.         position: static !important;
  90.     }
  91.  
  92.   `: '';
  93.  
  94.   // fallback if dummy style fn fails
  95.   const cssText4_smooth_transform_forced_props = ENABLE_NO_SMOOTH_TRANSFORM ? `
  96.  
  97.     /* optional */
  98.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  99.         height: auto !important;
  100.         min-height: unset !important;
  101.     }
  102.  
  103.     #items.style-scope.yt-live-chat-item-list-renderer {
  104.         transform: translateY(0px) !important;
  105.     }
  106.  
  107.     /* optional */
  108.  
  109.   `: '';
  110.  
  111.   const cssText5 = SET_CONTAIN_FOR_CHATROOM ? `
  112.  
  113.     /* ------------------------------------------------------------------------------------------------------------- */
  114.  
  115.     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 {
  116.         contain: layout style;
  117.     }
  118.  
  119.     #items.style-scope.yt-live-chat-item-list-renderer {
  120.         contain: layout paint style;
  121.     }
  122.  
  123.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  124.         contain: style;
  125.     }
  126.  
  127.     #item-scroller.style-scope.yt-live-chat-item-list-renderer {
  128.         contain: size style;
  129.     }
  130.  
  131.     #contents.style-scope.yt-live-chat-item-list-renderer, #chat.style-scope.yt-live-chat-renderer, img.style-scope.yt-img-shadow[width][height] {
  132.         contain: size layout paint style;
  133.     }
  134.  
  135.     .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label], .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label] > #container {
  136.         contain: layout paint style;
  137.     }
  138.  
  139.     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 {
  140.         contain: layout style;
  141.     }
  142.  
  143.     tp-yt-paper-tooltip[style*="inset"][role="tooltip"] {
  144.         contain: layout paint style;
  145.     }
  146.  
  147.     /* ------------------------------------------------------------------------------------------------------------- */
  148.  
  149.   ` : '';
  150.  
  151.   const cssText6b_show_more_button = FIX_SHOW_MORE_BUTTON_LOCATION ? `
  152.  
  153.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer{
  154.         top: 4px;
  155.         transition-property: top;
  156.         bottom: unset;
  157.     }
  158.  
  159.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer[disabled]{
  160.         top: -42px;
  161.     }
  162.  
  163.   `: '';
  164.  
  165.   const cssText6c_input_panel_overflow = FIX_INPUT_PANEL_OVERFLOW_ISSUE ? `
  166.  
  167.     #input-panel #picker-buttons yt-live-chat-icon-toggle-button-renderer#product-picker {
  168.         contain: layout style;
  169.     }
  170.  
  171.     #chat.yt-live-chat-renderer ~ #panel-pages.yt-live-chat-renderer {
  172.         overflow: visible;
  173.     }
  174.  
  175.   `: '';
  176.  
  177.   const cssText6d_input_panel_border = FIX_INPUT_PANEL_BORDER_ISSUE ? `
  178.  
  179.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer:not(:empty) {
  180.         --yt-live-chat-action-panel-top-border: none;
  181.     }
  182.  
  183.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer.iron-selected > *:first-child {
  184.         border-top: 1px solid var(--yt-live-chat-panel-pages-border-color);
  185.     }
  186.  
  187.     html #panel-pages.yt-live-chat-renderer {
  188.         border-top: 0;
  189.         border-bottom: 0;
  190.     }
  191.  
  192.   `: '';
  193.  
  194.   const cssText7b_content_visibility_unset = FORCE_CONTENT_VISIBILITY_UNSET ? `
  195.  
  196.     img,
  197.     yt-img-shadow[height][width],
  198.     yt-img-shadow {
  199.         content-visibility: visible !important;
  200.     }
  201.  
  202.   `  : '';
  203.  
  204.   const cssText7c_will_change_unset = FORCE_WILL_CHANGE_UNSET ? `
  205.  
  206.     /* remove YouTube constant will-change */
  207.     /* constant value will slow down the performance; default auto */
  208.  
  209.     /* www-player.css */
  210.     html .ytp-contextmenu,
  211.     html .ytp-settings-menu {
  212.         will-change: unset;
  213.     }
  214.  
  215.     /* frequently matched elements */
  216.     html .fill.yt-interaction,
  217.     html .stroke.yt-interaction,
  218.     html .yt-spec-touch-feedback-shape__fill,
  219.     html .yt-spec-touch-feedback-shape__stroke {
  220.         will-change: unset;
  221.     }
  222.  
  223.     /* live_chat_polymer.js */
  224.     /*
  225.     html .toggle-button.tp-yt-paper-toggle-button,
  226.     html #primaryProgress.tp-yt-paper-progress,
  227.     html #secondaryProgress.tp-yt-paper-progress,
  228.     html #onRadio.tp-yt-paper-radio-button,
  229.     html .fill.yt-interaction,
  230.     html .stroke.yt-interaction,
  231.     html .yt-spec-touch-feedback-shape__fill,
  232.     html .yt-spec-touch-feedback-shape__stroke {
  233.         will-change: unset;
  234.     }
  235.     */
  236.  
  237.     /* desktop_polymer_enable_wil_icons.js */
  238.     /* html .fill.yt-interaction,
  239.     html .stroke.yt-interaction, */
  240.     html tp-yt-app-header::before,
  241.     html tp-yt-iron-list,
  242.     html #items.tp-yt-iron-list > *,
  243.     html #onRadio.tp-yt-paper-radio-button,
  244.     html .toggle-button.tp-yt-paper-toggle-button,
  245.     html ytd-thumbnail-overlay-toggle-button-renderer[use-expandable-tooltip] #label.ytd-thumbnail-overlay-toggle-button-renderer,
  246.     html #items.ytd-post-multi-image-renderer,
  247.     html #items.ytd-horizontal-card-list-renderer,
  248.     html #items.yt-horizontal-list-renderer,
  249.     html #left-arrow.yt-horizontal-list-renderer,
  250.     html #right-arrow.yt-horizontal-list-renderer,
  251.     html #items.ytd-video-description-infocards-section-renderer,
  252.     html #items.ytd-video-description-music-section-renderer,
  253.     html #chips.ytd-feed-filter-chip-bar-renderer,
  254.     html #chips.yt-chip-cloud-renderer,
  255.     html #items.ytd-merch-shelf-renderer,
  256.     html #items.ytd-product-details-image-carousel-renderer,
  257.     html ytd-video-preview,
  258.     html #player-container.ytd-video-preview,
  259.     html #primaryProgress.tp-yt-paper-progress,
  260.     html #secondaryProgress.tp-yt-paper-progress,
  261.     html ytd-miniplayer[enabled] /* ,
  262.     html .yt-spec-touch-feedback-shape__fill,
  263.     html .yt-spec-touch-feedback-shape__stroke */ {
  264.         will-change: unset;
  265.     }
  266.  
  267.     /* other */
  268.     .ytp-videowall-still-info-content[class],
  269.     .ytp-suggestion-image[class] {
  270.         will-change: unset !important;
  271.     }
  272.  
  273.   ` : '';
  274.  
  275.   const ENABLE_FONT_PRE_RENDERING = typeof HTMLElement.prototype.append === 'function' ? (ENABLE_FONT_PRE_RENDERING_PREFERRED || 0) : 0;
  276.   const cssText8_fonts_pre_render = ENABLE_FONT_PRE_RENDERING ? `
  277.  
  278.     elzm-fonts {
  279.         visibility: collapse;
  280.         position: fixed;
  281.         top: -10px;
  282.         left: -10px;
  283.         font-size: 10pt;
  284.         line-height: 100%;
  285.         width: 100px;
  286.         height: 100px;
  287.         transform: scale(0.1);
  288.         transform: scale(0.01);
  289.         transform: scale(0.001);
  290.         transform-origin: 0 0;
  291.         contain: strict;
  292.         display: block;
  293.  
  294.         user-select: none !important;
  295.         pointer-events: none !important;
  296.     }
  297.  
  298.     elzm-fonts[id]#elzm-fonts-yk75g {
  299.         user-select: none !important;
  300.         pointer-events: none !important;
  301.     }
  302.  
  303.     elzm-font {
  304.         visibility: collapse;
  305.         position: absolute;
  306.         line-height: 100%;
  307.         width: 100px;
  308.         height: 100px;
  309.         contain: strict;
  310.         display: block;
  311.  
  312.         user-select: none !important;
  313.         pointer-events: none !important;
  314.     }
  315.  
  316.     elzm-font::before {
  317.         visibility: collapse;
  318.         position: absolute;
  319.         line-height: 100%;
  320.         width: 100px;
  321.         height: 100px;
  322.         contain: strict;
  323.         display: block;
  324.  
  325.         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';
  326.  
  327.         user-select: none !important;
  328.         pointer-events: none !important;
  329.     }
  330.  
  331.   `: '';
  332.  
  333.   const cssText9_no_backdrop_filter_when_menu_shown = NO_BACKDROP_FILTER_WHEN_MENU_SHOWN ? `
  334.     tp-yt-iron-dropdown.yt-live-chat-app ytd-menu-popup-renderer  {
  335.         -webkit-backdrop-filter: none;
  336.         backdrop-filter: none;
  337.     }
  338.   `: '';
  339.  
  340.  
  341.   const addCss = () => `
  342.  
  343.   ${cssText8_fonts_pre_render}
  344.  
  345.   ${cssText9_no_backdrop_filter_when_menu_shown}
  346.  
  347.   @supports (contain: layout paint style) {
  348.  
  349.     ${cssText5}
  350.  
  351.   }
  352.  
  353.   @supports (color: var(--general)) {
  354.  
  355.     html {
  356.         --yt-live-chat-item-list-renderer-padding: 0px 0px;
  357.     }
  358.  
  359.     ${cssText3_smooth_transform_position}
  360.  
  361.     ${cssText7c_will_change_unset}
  362.  
  363.     ${cssText7b_content_visibility_unset}
  364.  
  365.     yt-live-chat-item-list-renderer:not([allow-scroll]) #item-scroller.yt-live-chat-item-list-renderer {
  366.         overflow-y: scroll;
  367.         padding-right: 0;
  368.     }
  369.  
  370.     ${cssText4_smooth_transform_forced_props}
  371.  
  372.     yt-icon[icon="down_arrow"] > *, yt-icon-button#show-more > * {
  373.         pointer-events: none !important;
  374.     }
  375.  
  376.     #continuations, #continuations * {
  377.         contain: strict;
  378.         position: fixed;
  379.         top: 2px;
  380.         height: 1px;
  381.         width: 2px;
  382.         height: 1px;
  383.         visibility: collapse;
  384.     }
  385.  
  386.     ${cssText6b_show_more_button}
  387.  
  388.     ${cssText6d_input_panel_border}
  389.  
  390.     ${cssText6c_input_panel_overflow}
  391.  
  392.   }
  393.  
  394.  
  395.   @supports (overflow-anchor: auto) {
  396.  
  397.     .no-anchor * {
  398.         overflow-anchor: none;
  399.     }
  400.     .no-anchor > item-anchor {
  401.         overflow-anchor: auto;
  402.     }
  403.  
  404.     item-anchor {
  405.  
  406.         height:1px;
  407.         width: 100%;
  408.         transform: scaleY(0.00001);
  409.         transform-origin:0 0;
  410.         contain: strict;
  411.         opacity:0;
  412.         display:flex;
  413.         position:relative;
  414.         flex-shrink:0;
  415.         flex-grow:0;
  416.         margin-bottom:0;
  417.         overflow:hidden;
  418.         box-sizing:border-box;
  419.         visibility: visible;
  420.         content-visibility: visible;
  421.         contain-intrinsic-size: auto 1px;
  422.         pointer-events:none !important;
  423.  
  424.     }
  425.  
  426.     #item-scroller.style-scope.yt-live-chat-item-list-renderer[class] {
  427.         overflow-anchor: initial !important; /* whenever ENABLE_OVERFLOW_ANCHOR or not */
  428.     }
  429.  
  430.     html item-anchor {
  431.  
  432.         height: 1px;
  433.         width: 1px;
  434.         top: auto;
  435.         left: auto;
  436.         right: auto;
  437.         bottom: auto;
  438.         transform: translateY(-1px);
  439.         position: absolute;
  440.         z-index: -1;
  441.  
  442.     }
  443.  
  444.   }
  445.  
  446.   @supports (color: var(--pre-rendering)) {
  447.  
  448.     @keyframes dontRenderAnimation {
  449.         0% {
  450.             background-position-x: 3px;
  451.         }
  452.         100% {
  453.             background-position-x: 4px;
  454.         }
  455.     }
  456.  
  457.     /*html[dont-render-enabled] */ .dont-render{
  458.  
  459.         visibility: collapse !important;
  460.         transform: scale(0.01) !important;
  461.         transform: scale(0.00001) !important;
  462.         transform: scale(0.0000001) !important;
  463.         transform-origin: 0 0 !important;
  464.         z-index:-1 !important;
  465.         contain: strict !important;
  466.         box-sizing: border-box !important;
  467.  
  468.         height: 1px !important;
  469.         height: 0.1px !important;
  470.         height: 0.01px !important;
  471.         height: 0.0001px !important;
  472.         height: 0.000001px !important;
  473.  
  474.         animation: dontRenderAnimation 1ms linear 80ms 1 normal forwards !important;
  475.  
  476.     }
  477.  
  478.   }
  479.  
  480.   `;
  481.  
  482.  
  483.   const win = typeof unsafeWindow !== 'undefined' ? unsafeWindow : (this instanceof Window ? this : window);
  484.  
  485.   // Create a unique key for the script and check if it is already running
  486.   const hkey_script = 'mchbwnoasqph';
  487.   if (win[hkey_script]) throw new Error('Duplicated Userscript Calling'); // avoid duplicated scripting
  488.   win[hkey_script] = true;
  489.  
  490.  
  491.   function dr(s) {
  492.     // reserved for future use
  493.     return s;
  494.     // return window.deWeakJS ? window.deWeakJS(s) : s;
  495.   }
  496.  
  497.   const getProto = (element) => {
  498.     if (element) {
  499.       const cnt = element.inst || element;
  500.       return cnt.constructor.prototype || null;
  501.     }
  502.     return null;
  503.   }
  504.  
  505.   const assertor = (f) => f() || console.assert(false, f + "");
  506.  
  507.   const fnIntegrity = (f, d) => {
  508.     if (!f || typeof f !== 'function') {
  509.       console.warn('f is not a function', f);
  510.       return;
  511.     }
  512.     let p = f + "", s = 0, j = -1, w = 0;
  513.     for (let i = 0, l = p.length; i < l; i++) {
  514.       const t = p[i];
  515.       if (((t >= 'a' && t <= 'z') || (t >= 'A' && t <= 'Z'))) {
  516.         if (j < i - 1) w++;
  517.         j = i;
  518.       } else {
  519.         s++;
  520.       }
  521.     }
  522.     let itz = `${f.length}.${s}.${w}`;
  523.     if (!d) {
  524.       console.log(itz);
  525.       return null;
  526.     } else {
  527.       return itz === d;
  528.     }
  529.   }
  530.  
  531.  
  532.   console.assert(MAX_ITEMS_FOR_TOTAL_DISPLAY > 0 && MAX_ITEMS_FOR_FULL_FLUSH > 0 && MAX_ITEMS_FOR_TOTAL_DISPLAY > MAX_ITEMS_FOR_FULL_FLUSH)
  533.  
  534.   let ENABLE_FULL_RENDER_REQUIRED_CAPABLE = false;
  535.   const isContainSupport = CSS.supports('contain', 'layout paint style');
  536.   if (!isContainSupport) {
  537.     console.warn("Your browser does not support css property 'contain'.\nPlease upgrade to the latest version.".trim());
  538.   } else {
  539.     ENABLE_FULL_RENDER_REQUIRED_CAPABLE = true;
  540.   }
  541.  
  542.   let ENABLE_OVERFLOW_ANCHOR_CAPABLE = false;
  543.   const isOverflowAnchorSupport = CSS.supports('overflow-anchor', 'auto');
  544.   if (!isOverflowAnchorSupport) {
  545.     console.warn("Your browser does not support css property 'overflow-anchor'.\nPlease upgrade to the latest version.".trim());
  546.   } else {
  547.     ENABLE_OVERFLOW_ANCHOR_CAPABLE = true;
  548.   }
  549.  
  550.   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.
  551.  
  552.   const ENABLE_OVERFLOW_ANCHOR = ENABLE_OVERFLOW_ANCHOR_PREFERRED && ENABLE_OVERFLOW_ANCHOR_CAPABLE && ENABLE_NO_SMOOTH_TRANSFORM;
  553.   const ENABLE_FULL_RENDER_REQUIRED = ENABLE_FULL_RENDER_REQUIRED_PREFERRED && ENABLE_FULL_RENDER_REQUIRED_CAPABLE && ENABLE_OVERFLOW_ANCHOR && ENABLE_NO_SMOOTH_TRANSFORM && NOT_FIREFOX;
  554.  
  555.  
  556.   const fxOperator = (proto, propertyName) => {
  557.     let propertyDescriptorGetter = null;
  558.     try {
  559.       propertyDescriptorGetter = Object.getOwnPropertyDescriptor(proto, propertyName).get;
  560.     } catch (e) { }
  561.     return typeof propertyDescriptorGetter === 'function' ? (e) => {
  562.       try {
  563.  
  564.         return propertyDescriptorGetter.call(dr(e));
  565.       } catch (e) { }
  566.       return e[propertyName];
  567.     } : (e) => e[propertyName];
  568.   };
  569.  
  570.   const nodeParent = fxOperator(Node.prototype, 'parentNode');
  571.   // const nFirstElem = fxOperator(HTMLElement.prototype, 'firstElementChild');
  572.   const nPrevElem = fxOperator(HTMLElement.prototype, 'previousElementSibling');
  573.   const nNextElem = fxOperator(HTMLElement.prototype, 'nextElementSibling');
  574.   const nLastElem = fxOperator(HTMLElement.prototype, 'lastElementChild');
  575.  
  576.  
  577.   const groupCollapsed = (text1, text2) => {
  578.  
  579.     console.groupCollapsed(`%c${text1}%c${text2}`,
  580.       "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;",
  581.       "background-color: #010502; color: #6ad9fe; font-weight: 300; padding: 2px;"
  582.     );
  583.   }
  584.  
  585.  
  586.   const EVENT_KEY_ON_REGISTRY_READY = "ytI-ce-registry-created";
  587.   const onRegistryReady = (callback) => {
  588.     if (typeof customElements === 'undefined') {
  589.       if (!('__CE_registry' in document)) {
  590.         // https://github.com/webcomponents/polyfills/
  591.         Object.defineProperty(document, '__CE_registry', {
  592.           get() {
  593.             // return undefined
  594.           },
  595.           set(nv) {
  596.             if (typeof nv == 'object') {
  597.               delete this.__CE_registry;
  598.               this.__CE_registry = nv;
  599.               this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
  600.             }
  601.             return true;
  602.           },
  603.           enumerable: false,
  604.           configurable: true
  605.         })
  606.       }
  607.       let eventHandler = (evt) => {
  608.         document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  609.         const f = callback;
  610.         callback = null;
  611.         eventHandler = null;
  612.         f();
  613.       };
  614.       document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  615.     } else {
  616.       callback();
  617.     }
  618.   };
  619.  
  620.   const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  621.  
  622.   /* globals WeakRef:false */
  623.  
  624.   /** @type {(o: Object | null) => WeakRef | null} */
  625.   const mWeakRef = typeof WeakRef === 'function' ? (o => o ? new WeakRef(o) : null) : (o => o || null);
  626.  
  627.   /** @type {(wr: Object | null) => Object | null} */
  628.   const kRef = (wr => (wr && wr.deref) ? wr.deref() : wr);
  629.  
  630.   const { addCssManaged } = (() => {
  631.  
  632.     const addFontPreRendering = () => {
  633.  
  634.       groupCollapsed("YouTube Super Fast Chat", " | Fonts Pre-Rendering");
  635.  
  636.       let efsContainer = document.createElement('elzm-fonts');
  637.       efsContainer.id = 'elzm-fonts-yk75g'
  638.  
  639.       const arr = [];
  640.       let p = document.createElement('elzm-font');
  641.       arr.push(p);
  642.  
  643.       if (ENABLE_FONT_PRE_RENDERING & 1) {
  644.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  645.  
  646.           p = document.createElement('elzm-font');
  647.           p.style.fontWeight = size;
  648.           arr.push(p);
  649.         }
  650.       }
  651.  
  652.       if (ENABLE_FONT_PRE_RENDERING & 2) {
  653.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  654.  
  655.           p = document.createElement('elzm-font');
  656.           p.style.fontFamily = 'Roboto';
  657.           p.style.fontWeight = size;
  658.           arr.push(p);
  659.         }
  660.       }
  661.  
  662.       if (ENABLE_FONT_PRE_RENDERING & 4) {
  663.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  664.  
  665.           p = document.createElement('elzm-font');
  666.           p.style.fontFamily = '"YouTube Noto",Roboto,Arial,Helvetica,sans-serif';
  667.           p.style.fontWeight = size;
  668.           arr.push(p);
  669.         }
  670.       }
  671.  
  672.  
  673.       if (ENABLE_FONT_PRE_RENDERING & 8) {
  674.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  675.  
  676.           p = document.createElement('elzm-font');
  677.           p.style.fontFamily = '"Noto",Roboto,Arial,Helvetica,sans-serif';
  678.           p.style.fontWeight = size;
  679.           arr.push(p);
  680.         }
  681.       }
  682.  
  683.  
  684.       if (ENABLE_FONT_PRE_RENDERING & 16) {
  685.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  686.  
  687.           p = document.createElement('elzm-font');
  688.           p.style.fontFamily = 'sans-serif';
  689.           p.style.fontWeight = size;
  690.           arr.push(p);
  691.         }
  692.       }
  693.  
  694.       console.log('number of elzm-font elements', arr.length);
  695.  
  696.       HTMLElement.prototype.append.apply(efsContainer, arr);
  697.  
  698.       (document.body || document.documentElement).appendChild(efsContainer);
  699.  
  700.  
  701.       console.log('elzm-font elements have been added to the page for rendering.');
  702.  
  703.       console.groupEnd();
  704.  
  705.     }
  706.  
  707.     let isCssAdded = false;
  708.  
  709.     function addCssElement() {
  710.       let s = document.createElement('style');
  711.       s.id = 'ewRvC';
  712.       return s;
  713.     }
  714.  
  715.     const addCssManaged = () => {
  716.       if (!isCssAdded && document.documentElement && document.head) {
  717.         isCssAdded = true;
  718.         document.head.appendChild(dr(addCssElement())).textContent = addCss();
  719.         if (ENABLE_FONT_PRE_RENDERING) {
  720.           Promise.resolve().then(addFontPreRendering)
  721.         }
  722.       }
  723.     }
  724.  
  725.     return { addCssManaged };
  726.   })();
  727.  
  728.  
  729.   const { setupStyle } = (() => {
  730.  
  731.     const sp7 = Symbol();
  732.  
  733.     const proxyHelperFn = (dummy) => ({
  734.  
  735.       get(target, prop) {
  736.         return (prop in dummy) ? dummy[prop] : prop === sp7 ? target : target[prop];
  737.       },
  738.       set(target, prop, value) {
  739.         if (!(prop in dummy)) {
  740.           target[prop] = value;
  741.         }
  742.         return true;
  743.       },
  744.       has(target, prop) {
  745.         return (prop in target);
  746.       },
  747.       deleteProperty(target, prop) {
  748.         return true;
  749.       },
  750.       ownKeys(target) {
  751.         return Object.keys(target);
  752.       },
  753.       defineProperty(target, key, descriptor) {
  754.         return Object.defineProperty(target, key, descriptor);
  755.       },
  756.       getOwnPropertyDescriptor(target, key) {
  757.         return Object.getOwnPropertyDescriptor(target, key);
  758.       },
  759.  
  760.     });
  761.  
  762.     const setupStyle = (m1, m2) => {
  763.       if (!ENABLE_NO_SMOOTH_TRANSFORM) return;
  764.  
  765.       const dummy1v = {
  766.         transform: '',
  767.         height: '',
  768.         minHeight: '',
  769.         paddingBottom: '',
  770.         paddingTop: ''
  771.       };
  772.  
  773.       const dummyStyleFn = (k) => (function () { const style = this[sp7]; return style[k](...arguments); });
  774.       for (const k of ['toString', 'getPropertyPriority', 'getPropertyValue', 'item', 'removeProperty', 'setProperty']) {
  775.         dummy1v[k] = dummyStyleFn(k);
  776.       }
  777.  
  778.       const dummy1p = proxyHelperFn(dummy1v);
  779.       const sp1v = new Proxy(m1.style, dummy1p);
  780.       const sp2v = new Proxy(m2.style, dummy1p);
  781.       Object.defineProperty(m1, 'style', { get() { return sp1v }, set() { }, enumerable: true, configurable: true });
  782.       Object.defineProperty(m2, 'style', { get() { return sp2v }, set() { }, enumerable: true, configurable: true });
  783.       m1.removeAttribute("style");
  784.       m2.removeAttribute("style");
  785.  
  786.     }
  787.  
  788.     return { setupStyle };
  789.  
  790.   })();
  791.  
  792.  
  793.   const cleanContext = async (win) => {
  794.     const waitFn = requestAnimationFrame; // shall have been binded to window
  795.     try {
  796.       let mx = 16; // MAX TRIAL
  797.       const frameId = 'vanillajs-iframe-v1';
  798.       /** @type {HTMLIFrameElement | null} */
  799.       let frame = document.getElementById(frameId);
  800.       let removeIframeFn = null;
  801.       if (!frame) {
  802.         frame = document.createElement('iframe');
  803.         frame.id = 'vanillajs-iframe-v1';
  804.         frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
  805.         let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
  806.         n.appendChild(frame);
  807.         while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
  808.         const root = document.documentElement;
  809.         root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
  810.         removeIframeFn = (setTimeout) => {
  811.           const removeIframeOnDocumentReady = (e) => {
  812.             e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  813.             win = null;
  814.             setTimeout(() => {
  815.               n.remove();
  816.               n = null;
  817.             }, 200);
  818.           }
  819.           if (document.readyState !== 'loading') {
  820.             removeIframeOnDocumentReady();
  821.           } else {
  822.             win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  823.           }
  824.         }
  825.       }
  826.       while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
  827.       const fc = frame.contentWindow;
  828.       if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
  829.       const { requestAnimationFrame, setTimeout, cancelAnimationFrame } = fc;
  830.       const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame };
  831.       for (let k in res) res[k] = res[k].bind(win); // necessary
  832.       if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
  833.       return res;
  834.     } catch (e) {
  835.       console.warn(e);
  836.       return null;
  837.     }
  838.   };
  839.  
  840.   cleanContext(win).then(__CONTEXT__ => {
  841.     if (!__CONTEXT__) return null;
  842.  
  843.  
  844.     const { requestAnimationFrame, setTimeout, cancelAnimationFrame } = __CONTEXT__;
  845.  
  846.  
  847.     (() => {
  848.       // data manipulation
  849.  
  850.       if (!DO_PARTICIPANT_LIST_HACKS) return;
  851.  
  852.       class Mutex {
  853.  
  854.         constructor() {
  855.           this.p = Promise.resolve()
  856.         }
  857.  
  858.         /**
  859.          *  @param {(lockResolve: () => void)} f
  860.          */
  861.         lockWith(f) {
  862.           this.p = this.p.then(() => new Promise(f).catch(console.warn))
  863.         }
  864.  
  865.       }
  866.  
  867.  
  868.       /**
  869.  
  870.        h.onParticipantsChanged = function() {
  871.           this.notifyPath("participantsManager.participants")
  872.       }
  873.  
  874.  
  875.       at h.onParticipantsChanged (live_chat_polymer.js:8334:41)
  876.       at e.<anonymous> (live_chat_polymer.js:1637:69)
  877.       at e.Bb [as __shady_dispatchEvent] (webcomponents-sd.js:46:110)
  878.       at k.dispatchEvent (webcomponents-sd.js:122:237)
  879.       at mu (live_chat_polymer.js:1677:71)
  880.       at Object.wga [as fn] (live_chat_polymer.js:1678:99)
  881.       at a._propertiesChanged (live_chat_polymer.js:1726:426)
  882.       at b._flushProperties (live_chat_polymer.js:1597:200)
  883.       at a._invalidateProperties (live_chat_polymer.js:1718:69)
  884.       at a.notifyPath (live_chat_polymer.js:1741:182)
  885.  
  886.       */
  887.  
  888.  
  889.       const beforeParticipantsMap = new WeakMap();
  890.  
  891.       const { notifyPath7081 } = (() => {
  892.  
  893.  
  894.         const foundMap = (base, content) => {
  895.  
  896.           let lastSearch = 0;
  897.           let founds = base.map(baseEntry => {
  898.             let search = content.indexOf(baseEntry, lastSearch);
  899.             if (search < 0) return false;
  900.             lastSearch = search + 1;
  901.             return true;
  902.           });
  903.           return founds;
  904.  
  905.  
  906.         }
  907.  
  908.  
  909.  
  910.         const spliceIndicesFunc = (beforeParticipants, participants, idsBefore, idsAfter) => {
  911.  
  912.           const handler1 = {
  913.             get(target, prop, receiver) {
  914.               if (prop === 'object') {
  915.                 return participants; // avoid memory leakage
  916.               }
  917.               if (prop === 'type') {
  918.                 return 'splice';
  919.               }
  920.               return target[prop];
  921.             }
  922.           };
  923.           const releaser = () => {
  924.             beforeParticipants = null;
  925.             participants = null;
  926.             idsBefore = null;
  927.             idsAfter = null;
  928.           }
  929.  
  930.  
  931.           let foundsForAfter = foundMap(idsAfter, idsBefore);
  932.           let foundsForBefore = foundMap(idsBefore, idsAfter);
  933.  
  934.           let indexSplices = [];
  935.           let contentUpdates = [];
  936.           for (let i = 0, j = 0; i < foundsForBefore.length || j < foundsForAfter.length;) {
  937.  
  938.             if (beforeParticipants[i] === participants[j]) {
  939.               i++; j++;
  940.             } else if (idsBefore[i] === idsAfter[j]) {
  941.               // content changed
  942.               contentUpdates.push({ indexI: i, indexJ: j })
  943.               i++; j++;
  944.             } else {
  945.               let addedCount = 0;
  946.               for (let q = j; q < foundsForAfter.length; q++) {
  947.                 if (foundsForAfter[q] === false) addedCount++;
  948.                 else break;
  949.               }
  950.  
  951.               let removedCount = 0;
  952.               for (let q = i; q < foundsForBefore.length; q++) {
  953.                 if (foundsForBefore[q] === false) removedCount++;
  954.                 else break;
  955.               }
  956.               if (!addedCount && !removedCount) {
  957.                 throw 'ERROR(0xFF32): spliceIndicesFunc';
  958.               }
  959.               indexSplices.push(new Proxy({
  960.                 index: j,
  961.                 addedCount: addedCount,
  962.                 removed: removedCount >= 1 ? beforeParticipants.slice(i, i + removedCount) : []
  963.               }, handler1));
  964.  
  965.               i += removedCount;
  966.               j += addedCount;
  967.  
  968.             }
  969.           }
  970.           return { indexSplices, contentUpdates, releaser };
  971.  
  972.  
  973.         }
  974.  
  975.         const mutexParticipants = new Mutex();
  976.  
  977.  
  978.         /*
  979.  
  980.         customElements.get("yt-live-chat-participant-renderer").prototype.notifyPath=function(){  console.log(123);  console.log(new Error().stack)}
  981.  
  982.         VM63631:1 Error
  983.         at customElements.get.notifyPath (<anonymous>:1:122)
  984.         at e.forwardRendererStamperChanges_ (live_chat_polymer.js:4453:35)
  985.         at e.rendererStamperApplyChangeRecord_ (live_chat_polymer.js:4451:12)
  986.         at e.rendererStamperObserver_ (live_chat_polymer.js:4448:149)
  987.         at Object.pu [as fn] (live_chat_polymer.js:1692:118)
  988.         at ju (live_chat_polymer.js:1674:217)
  989.         at a._propertiesChanged (live_chat_polymer.js:1726:122)
  990.         at b._flushProperties (live_chat_polymer.js:1597:200)
  991.         at a._invalidateProperties (live_chat_polymer.js:1718:69)
  992.         at a.notifyPath (live_chat_polymer.js:1741:182)
  993.  
  994.         */
  995.  
  996.         function convertToIds(participants) {
  997.           return participants.map(participant => {
  998.             if (!participant || typeof participant !== 'object') {
  999.               console.warn('Error(0xFA41): convertToIds', participant);
  1000.               return participant; // just in case
  1001.             }
  1002.             let keys = Object.keys(participant);
  1003.             // liveChatTextMessageRenderer
  1004.             // liveChatParticipantRenderer - livestream channel owner [no authorExternalChannelId]
  1005.             // liveChatPaidMessageRenderer
  1006.             /*
  1007.  
  1008.             'yt-live-chat-participant-renderer' utilizes the following:
  1009.             authorName.simpleText: string
  1010.             authorPhoto.thumbnails: Object{url:string, width:int, height:int} []
  1011.             authorBadges[].liveChatAuthorBadgeRenderer.icon.iconType: string
  1012.             authorBadges[].liveChatAuthorBadgeRenderer.tooltip: string
  1013.             authorBadges[].liveChatAuthorBadgeRenderer.accessibility.accessibilityData: Object{label:string}
  1014.  
  1015.             */
  1016.             if (keys.length !== 1) {
  1017.               console.warn('Error(0xFA42): convertToIds', participant);
  1018.               return participant; // just in case
  1019.             }
  1020.             let key = keys[0];
  1021.             let renderer = (participant[key] || 0);
  1022.             let authorName = (renderer.authorName || 0);
  1023.             let text = `${authorName.simpleText || authorName.text}`
  1024.             let res = participant; // fallback if it is not a vaild entry
  1025.             if (typeof text !== 'string') {
  1026.               console.warn('Error(0xFA53): convertToIds', participant);
  1027.             } else {
  1028.               text = `${renderer.authorExternalChannelId || 'null'}|${text || ''}`;
  1029.               if (text.length > 1) res = text;
  1030.             }
  1031.             return res;
  1032.             // return renderer?`${renderer.id}|${renderer.authorExternalChannelId}`: '';
  1033.             // note: renderer.id will be changed if the user typed something to trigger the update of the participants' record.
  1034.           });
  1035.         }
  1036.  
  1037.         const checkChangeToParticipantRendererContent = CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT ? (p1, p2) => {
  1038.           // just update when content is changed.
  1039.           if (p1.authorName !== p2.authorName) return true;
  1040.           if (p1.authorPhoto !== p2.authorPhoto) return true;
  1041.           if (p1.authorBadges !== p2.authorBadges) return true;
  1042.           return false;
  1043.         } : (p1, p2) => {
  1044.           // keep integrity all the time.
  1045.           return p1 !== p2; // always true
  1046.         }
  1047.  
  1048.         let uvid = 0;
  1049.  
  1050.         function notifyPath7081(path) { // cnt "yt-live-chat-participant-list-renderer"
  1051.  
  1052.           let stack = new Error().stack;
  1053.           if (path !== "participantsManager.participants" || stack.indexOf('.onParticipantsChanged') < 0) {
  1054.             return this.__notifyPath5036__.apply(this, arguments);
  1055.           }
  1056.  
  1057.           if (uvid > 1e8) uvid = uvid % 100;
  1058.           let tid = ++uvid;
  1059.  
  1060.           const cnt = this; // "yt-live-chat-participant-list-renderer"
  1061.           mutexParticipants.lockWith(lockResolve => {
  1062.  
  1063.             if (tid !== uvid) {
  1064.               lockResolve();
  1065.               return;
  1066.             }
  1067.  
  1068.             const participants = cnt.participantsManager.participants.slice(0);
  1069.             const beforeParticipants = beforeParticipantsMap.get(cnt) || [];
  1070.             beforeParticipantsMap.set(cnt, participants);
  1071.  
  1072.             const resPromise = (async () => {
  1073.  
  1074.               if (beforeParticipants.length === 0) {
  1075.                 // not error
  1076.                 return 0;
  1077.               }
  1078.  
  1079.               let countOfElements = cnt.__getAllParticipantsDOMRenderedLength__()
  1080.  
  1081.               // console.log(participants.length, doms.length) // different if no requestAnimationFrame
  1082.               if (beforeParticipants.length !== countOfElements) {
  1083.                 // there is somewrong for the cache. - sometimes happen
  1084.                 return 0;
  1085.               }
  1086.  
  1087.               const idsBefore = convertToIds(beforeParticipants);
  1088.               const idsAfter = convertToIds(participants);
  1089.  
  1090.               let { indexSplices, contentUpdates, releaser } = spliceIndicesFunc(beforeParticipants, participants, idsBefore, idsAfter);
  1091.  
  1092.               let res = 1; // default 1 for no update
  1093.  
  1094.               if (indexSplices.length >= 1) {
  1095.  
  1096.  
  1097.                 // let p2 =  participants.slice(indexSplices[0].index, indexSplices[0].index+indexSplices[0].addedCount);
  1098.                 // let p1 = indexSplices[0].removed;
  1099.                 // console.log(indexSplices.length, indexSplices ,p1,p2,  convertToIds(p1),convertToIds(p2))
  1100.  
  1101.                 /* folllow
  1102.                     a.notifyPath(c + ".splices", d);
  1103.                     a.notifyPath(c + ".length", b.length);
  1104.                 */
  1105.                 // stampDomArraySplices_
  1106.  
  1107.  
  1108.                 await new Promise(resolve => {
  1109.                   cnt.resolveForDOMRendering781 = resolve;
  1110.  
  1111.                   cnt.__notifyPath5036__("participantsManager.participants.splices", {
  1112.                     indexSplices
  1113.                   });
  1114.                   indexSplices = null;
  1115.                   releaser();
  1116.                   releaser = null;
  1117.                   cnt.__notifyPath5036__("participantsManager.participants.length",
  1118.                     participants.length
  1119.                   );
  1120.  
  1121.                 });
  1122.  
  1123.                 await Promise.resolve(0); // play safe for the change of 'length'
  1124.                 countOfElements = cnt.__getAllParticipantsDOMRenderedLength__();
  1125.  
  1126.                 let wrongSize = participants.length !== countOfElements
  1127.                 if (wrongSize) {
  1128.                   console.warn("ERROR(0xE2C3): notifyPath7081", beforeParticipants.length, participants.length, doms.length)
  1129.                   return 0;
  1130.                 }
  1131.  
  1132.                 res = 2 | 4;
  1133.  
  1134.               } else {
  1135.  
  1136.                 indexSplices = null;
  1137.                 releaser();
  1138.                 releaser = null;
  1139.  
  1140.                 if (participants.length !== countOfElements) {
  1141.                   // other unhandled cases
  1142.                   return 0;
  1143.                 }
  1144.  
  1145.               }
  1146.  
  1147.               // participants.length === countOfElements before contentUpdates
  1148.               if (contentUpdates.length >= 1) {
  1149.                 for (const contentUpdate of contentUpdates) {
  1150.                   let isChanged = checkChangeToParticipantRendererContent(beforeParticipants[contentUpdate.indexI], participants[contentUpdate.indexJ]);
  1151.                   if (isChanged) {
  1152.                     cnt.__notifyPath5036__(`participantsManager.participants[${contentUpdate.indexJ}]`);
  1153.                     res |= 4 | 8;
  1154.                   }
  1155.                 }
  1156.               }
  1157.               contentUpdates = null;
  1158.  
  1159.               return res;
  1160.  
  1161.  
  1162.             })();
  1163.  
  1164.  
  1165.             resPromise.then(resValue => {
  1166.  
  1167.               const isLogRequired = SHOW_PARTICIPANT_CHANGES_IN_CONSOLE && ((resValue === 0) || ((resValue & 4) === 4));
  1168.               isLogRequired && groupCollapsed("Participant List Change", `tid = ${tid}; res = ${resValue}`);
  1169.               if (resValue === 0) {
  1170.                 new Promise(resolve => {
  1171.                   cnt.resolveForDOMRendering781 = resolve;
  1172.                   isLogRequired && console.log("Full Refresh begins");
  1173.                   cnt.__notifyPath5036__("participantsManager.participants"); // full refresh
  1174.                 }).then(() => {
  1175.                   isLogRequired && console.log("Full Refresh ends");
  1176.                   console.groupEnd();
  1177.                 }).then(lockResolve);
  1178.                 return;
  1179.               }
  1180.  
  1181.               const delayLockResolve = (resValue & 4) === 4;
  1182.  
  1183.               if (delayLockResolve) {
  1184.                 isLogRequired && console.log(`Number of participants (before): ${beforeParticipants.length}`);
  1185.                 isLogRequired && console.log(`Number of participants (after): ${participants.length}`);
  1186.                 isLogRequired && console.log(`Total number of rendered participants: ${cnt.__getAllParticipantsDOMRenderedLength__()}`);
  1187.                 isLogRequired && console.log(`Participant Renderer Content Updated: ${(resValue & 8) === 8}`);
  1188.                 isLogRequired && console.groupEnd();
  1189.                 // requestAnimationFrame is required to avoid particiant update during DOM changing (stampDomArraySplices_)
  1190.                 // mutex lock with requestAnimationFrame can also disable participants update in background
  1191.                 requestAnimationFrame(lockResolve);
  1192.               } else {
  1193.                 lockResolve();
  1194.               }
  1195.  
  1196.             });
  1197.  
  1198.           });
  1199.  
  1200.  
  1201.         }
  1202.  
  1203.         return { notifyPath7081 };
  1204.  
  1205.       })();
  1206.  
  1207.  
  1208.       const onRegistryReadyForDataManipulation = () => {
  1209.  
  1210.         function dummy5035(a, b, c) { }
  1211.         function dummy411(a, b, c) { }
  1212.  
  1213.         customElements.whenDefined("yt-live-chat-participant-list-renderer").then(() => {
  1214.  
  1215.           if (!DO_PARTICIPANT_LIST_HACKS) return;
  1216.  
  1217.           const tag = "yt-live-chat-participant-list-renderer"
  1218.           const cProto = getProto(document.createElement(tag));
  1219.           if (!cProto || typeof cProto.attached !== 'function') {
  1220.             // for _registered, proto.attached shall exist when the element is defined.
  1221.             // for controller extraction, attached shall exist when instance creates.
  1222.             console.warn(`proto.attached for ${tag} is unavailable.`);
  1223.             return;
  1224.           }
  1225.  
  1226.  
  1227.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-participant-list-renderer hacks");
  1228.  
  1229.           const canDoReplacement = (() => {
  1230.             if (typeof cProto.__notifyPath5035__ === 'function' && cProto.__notifyPath5035__.name !== 'dummy5035') {
  1231.               console.warn('YouTube Live Chat Tamer is running.');
  1232.               return;
  1233.             }
  1234.  
  1235.             if (typeof cProto.__attached411__ === 'function' && cProto.__attached411__.name !== 'dummy411') {
  1236.               console.warn('YouTube Live Chat Tamer is running.');
  1237.               return;
  1238.             }
  1239.  
  1240.             cProto.__notifyPath5035__ = dummy5035 // just to against Live Chat Tamer
  1241.             cProto.__attached411__ = dummy411 // just to against Live Chat Tamer
  1242.  
  1243.             if (typeof cProto.flushRenderStamperComponentBindings_ !== 'function' || cProto.flushRenderStamperComponentBindings_.length !== 0) {
  1244.               console.warn("ERROR(0xE355): cProto.flushRenderStamperComponentBindings_ not found");
  1245.               return;
  1246.             }
  1247.  
  1248.             if (typeof cProto.flushRenderStamperComponentBindings66_ === 'function') {
  1249.               console.warn("ERROR(0xE356): cProto.flushRenderStamperComponentBindings66_");
  1250.               return;
  1251.             }
  1252.  
  1253.             if (typeof cProto.__getAllParticipantsDOMRenderedLength__ === 'function') {
  1254.               console.warn("ERROR(0xE357): cProto.__getAllParticipantsDOMRenderedLength__");
  1255.               return;
  1256.             }
  1257.             return true;
  1258.           })();
  1259.  
  1260.           console.log(`Data Manipulation Boost = ${canDoReplacement}`);
  1261.  
  1262.  
  1263.           assertor(() => fnIntegrity(cProto.attached, '0.32.22')) // just warning
  1264.           assertor(() => fnIntegrity(cProto.flushRenderStamperComponentBindings_, '0.385.233')) // just warning
  1265.  
  1266.  
  1267.           cProto.flushRenderStamperComponentBindings66_ = cProto.flushRenderStamperComponentBindings_;
  1268.  
  1269.           cProto.flushRenderStamperComponentBindings_ = function () {
  1270.             // console.log('flushRenderStamperComponentBindings_')
  1271.             this.flushRenderStamperComponentBindings66_();
  1272.             if (this.resolveForDOMRendering781) {
  1273.               this.resolveForDOMRendering781();
  1274.               this.resolveForDOMRendering781 = null;
  1275.             }
  1276.           }
  1277.  
  1278.           cProto.__getAllParticipantsDOMRenderedLength__ = function () {
  1279.             const container = this.$.participants;
  1280.             return HTMLElement.prototype.querySelectorAll.call(container, 'yt-live-chat-participant-renderer').length;
  1281.           }
  1282.  
  1283.           const onPageElements = [...document.querySelectorAll('yt-live-chat-participant-list-renderer:not(.n9fJ3)')];
  1284.  
  1285.           cProto.__attached412__ = cProto.attached;
  1286.           const fpPList = function (hostElement) {
  1287.             const cnt = hostElement.inst || hostElement;
  1288.             if (beforeParticipantsMap.has(cnt)) return;
  1289.             hostElement.classList.add('n9fJ3');
  1290.  
  1291.             assertor(() => (cnt.__dataEnabled === true && cnt.__dataReady === true));
  1292.             if (typeof cnt.notifyPath !== 'function' || typeof cnt.__notifyPath5036__ !== 'undefined') {
  1293.               console.warn("ERROR(0xE318): yt-live-chat-participant-list-renderer")
  1294.               return;
  1295.             }
  1296.  
  1297.             groupCollapsed("Participant List attached", "");
  1298.             // cnt.$.participants.appendChild = cnt.$.participants.__shady_native_appendChild =  function(){
  1299.             //   console.log(123, 'appendChild');
  1300.             //   return HTMLElement.prototype.appendChild.apply(this, arguments)
  1301.             // }
  1302.  
  1303.             // cnt.$.participants.insertBefore =cnt.$.participants.__shady_native_insertBefore =  function(){
  1304.             //   console.log(123, 'insertBefore');
  1305.             //   return HTMLElement.prototype.insertBefore.apply(this, arguments)
  1306.             // }
  1307.  
  1308.             cnt.__notifyPath5036__ = cnt.notifyPath
  1309.             const participants = ((cnt.participantsManager || 0).participants || 0);
  1310.             assertor(() => (participants.length > -1 && typeof participants.slice === 'function'));
  1311.             console.log(`initial number of participants: ${participants.length}`);
  1312.             const newParticipants = (participants.length >= 1 && typeof participants.slice === 'function') ? participants.slice(0) : [];
  1313.             beforeParticipantsMap.set(cnt, newParticipants);
  1314.             cnt.notifyPath = notifyPath7081;
  1315.             console.log(`CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = ${CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT}`);
  1316.             console.groupEnd();
  1317.           }
  1318.           cProto.attached = function () {
  1319.             fpPList(this.hostElement || this);
  1320.             this.__attached412__.apply(this, arguments);
  1321.           };
  1322.  
  1323.           console.groupEnd();
  1324.  
  1325.           if (onPageElements.length >= 1) {
  1326.             for (const s of onPageElements) {
  1327.               if ((s.inst || s).isAttached === true) {
  1328.                 fpPList(s);
  1329.               }
  1330.             }
  1331.           }
  1332.  
  1333.         });
  1334.  
  1335.       };
  1336.  
  1337.       promiseForCustomYtElementsReady.then(onRegistryReadyForDataManipulation);
  1338.  
  1339.  
  1340.     })();
  1341.  
  1342.     IntersectionObserver && (() => {
  1343.  
  1344.       // dom manipulation
  1345.  
  1346.       class RAFHub {
  1347.         constructor() {
  1348.           /** @type {number} */
  1349.           this.startAt = 8170;
  1350.           /** @type {number} */
  1351.           this.counter = 0;
  1352.           /** @type {number} */
  1353.           this.rid = 0;
  1354.           /** @type {Map<number, FrameRequestCallback>} */
  1355.           this.funcs = new Map();
  1356.           const funcs = this.funcs;
  1357.           /** @type {FrameRequestCallback} */
  1358.           this.bCallback = this.mCallback.bind(this);
  1359.           this.pClear = () => funcs.clear();
  1360.         }
  1361.         /** @param {DOMHighResTimeStamp} highResTime */
  1362.         mCallback(highResTime) {
  1363.           this.rid = 0;
  1364.           Promise.resolve().then(this.pClear);
  1365.           this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
  1366.         }
  1367.         /** @param {FrameRequestCallback} f */
  1368.         request(f) {
  1369.           if (this.counter > 1e9) this.counter = 9;
  1370.           let cid = this.startAt + (++this.counter);
  1371.           this.funcs.set(cid, f);
  1372.           if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
  1373.           return cid;
  1374.         }
  1375.         /** @param {number} cid */
  1376.         cancel(cid) {
  1377.           cid = +cid;
  1378.           if (cid > 0) {
  1379.             if (cid <= this.startAt) {
  1380.               return cancelAnimationFrame(cid);
  1381.             }
  1382.             if (this.rid > 0) {
  1383.               this.funcs.delete(cid);
  1384.               if (this.funcs.size === 0) {
  1385.                 cancelAnimationFrame(this.rid);
  1386.                 this.rid = 0;
  1387.               }
  1388.             }
  1389.           }
  1390.         }
  1391.       }
  1392.  
  1393.  
  1394.       const rafHub = (ENABLE_RAF_HACK_TICKERS || ENABLE_RAF_HACK_DOCKED_MESSAGE || ENABLE_RAF_HACK_INPUT_RENDERER || ENABLE_RAF_HACK_EMOJI_PICKER) ? new RAFHub() : null;
  1395.  
  1396.  
  1397.       let dt0 = Date.now() - 2000;
  1398.       const dateNow = () => Date.now() - dt0;
  1399.       // let lastScroll = 0;
  1400.       // let lastLShow = 0;
  1401.       let lastWheel = 0;
  1402.       let lastMouseDown = 0;
  1403.       let lastMouseUp = 0;
  1404.       let currentMouseDown = false;
  1405.       let lastTouchDown = 0;
  1406.       let lastTouchUp = 0;
  1407.       let currentTouchDown = false;
  1408.       let lastUserInteraction = 0;
  1409.  
  1410.       let scrollChatFn = null;
  1411.  
  1412.       ENABLE_FULL_RENDER_REQUIRED && (() => {
  1413.  
  1414.         document.addEventListener('animationstart', (evt) => {
  1415.  
  1416.           if (evt.animationName === 'dontRenderAnimation') {
  1417.             evt.target.classList.remove('dont-render');
  1418.             if (scrollChatFn) scrollChatFn();
  1419.           }
  1420.  
  1421.         }, true);
  1422.  
  1423.         const f = (elm) => {
  1424.           if (elm && elm.nodeType === 1) {
  1425.             elm.classList.add('dont-render');
  1426.           }
  1427.         }
  1428.  
  1429.         Node.prototype.__appendChild931__ = function (a) {
  1430.           a = dr(a);
  1431.           if (this.id === 'items' && this.classList.contains('yt-live-chat-item-list-renderer')) {
  1432.             if (a && a.nodeType === 1) f(a);
  1433.             else if (a instanceof DocumentFragment) {
  1434.               for (let n = a.firstChild; n; n = n.nextSibling) {
  1435.                 f(n);
  1436.               }
  1437.             }
  1438.           }
  1439.         }
  1440.  
  1441.         Node.prototype.__appendChild932__ = function () {
  1442.           this.__appendChild931__.apply(this, arguments);
  1443.           return Node.prototype.appendChild.apply(this, arguments);
  1444.         }
  1445.  
  1446.  
  1447.       })();
  1448.  
  1449.  
  1450.       const watchUserCSS = () => {
  1451.  
  1452.         // if (!CSS.supports('contain-intrinsic-size', 'auto var(--wsr94)')) return;
  1453.  
  1454.         const getElemFromWR = (nr) => {
  1455.           const n = kRef(nr);
  1456.           if (n && n.isConnected) return n;
  1457.           return null;
  1458.         }
  1459.  
  1460.         const clearContentVisibilitySizing = () => {
  1461.           Promise.resolve().then(() => {
  1462.  
  1463.             let btnShowMoreWR = mWeakRef(document.querySelector('#show-more[disabled]'));
  1464.  
  1465.             let lastVisibleItemWR = null;
  1466.             for (const elm of document.querySelectorAll('[wSr93]')) {
  1467.               if (elm.getAttribute('wSr93') === 'visible') lastVisibleItemWR = mWeakRef(elm);
  1468.               elm.setAttribute('wSr93', '');
  1469.               // custom CSS property --wsr94 not working when attribute wSr93 removed
  1470.             }
  1471.             requestAnimationFrame(() => {
  1472.               const btnShowMore = getElemFromWR(btnShowMoreWR); btnShowMoreWR = null;
  1473.               if (btnShowMore) btnShowMore.click();
  1474.               else {
  1475.                 // would not work if switch it frequently
  1476.                 const lastVisibleItem = getElemFromWR(lastVisibleItemWR); lastVisibleItemWR = null;
  1477.                 if (lastVisibleItem) {
  1478.  
  1479.                   Promise.resolve()
  1480.                     .then(() => lastVisibleItem.scrollIntoView())
  1481.                     .then(() => lastVisibleItem.scrollIntoView(false))
  1482.                     .then(() => lastVisibleItem.scrollIntoView({ behavior: "instant", block: "end", inline: "nearest" }))
  1483.                     .catch(e => { }) // break the chain when method not callable
  1484.  
  1485.                 }
  1486.               }
  1487.             });
  1488.  
  1489.           });
  1490.  
  1491.         }
  1492.  
  1493.         const mutObserver = new MutationObserver((mutations) => {
  1494.           for (const mutation of mutations) {
  1495.             if ((mutation.addedNodes || 0).length >= 1) {
  1496.               for (const addedNode of mutation.addedNodes) {
  1497.                 if (addedNode.nodeName === 'STYLE') {
  1498.                   clearContentVisibilitySizing();
  1499.                   return;
  1500.                 }
  1501.               }
  1502.             }
  1503.             if ((mutation.removedNodes || 0).length >= 1) {
  1504.               for (const removedNode of mutation.removedNodes) {
  1505.                 if (removedNode.nodeName === 'STYLE') {
  1506.                   clearContentVisibilitySizing();
  1507.                   return;
  1508.                 }
  1509.               }
  1510.             }
  1511.           }
  1512.         });
  1513.  
  1514.         mutObserver.observe(document.documentElement, {
  1515.           childList: true,
  1516.           subtree: false
  1517.         });
  1518.         mutObserver.observe(document.head, {
  1519.           childList: true,
  1520.           subtree: false
  1521.         });
  1522.         mutObserver.observe(document.body, {
  1523.           childList: true,
  1524.           subtree: false
  1525.         });
  1526.  
  1527.       }
  1528.  
  1529.  
  1530.       class WillChangeController {
  1531.         constructor(itemScroller, willChangeValue) {
  1532.           this.element = itemScroller;
  1533.           this.counter = 0;
  1534.           this.active = false;
  1535.           this.willChangeValue = willChangeValue;
  1536.         }
  1537.  
  1538.         beforeOper() {
  1539.           if (!this.active) {
  1540.             this.active = true;
  1541.             this.element.style.willChange = this.willChangeValue;
  1542.           }
  1543.           this.counter++;
  1544.         }
  1545.  
  1546.         afterOper() {
  1547.           const c = this.counter;
  1548.           requestAnimationFrame(() => {
  1549.             if (c === this.counter) {
  1550.               this.active = false;
  1551.               this.element.style.willChange = '';
  1552.             }
  1553.           });
  1554.         }
  1555.  
  1556.         release() {
  1557.           const element = this.element;
  1558.           this.element = null;
  1559.           this.counter = 1e16;
  1560.           this.active = false;
  1561.           try {
  1562.             element.style.willChange = '';
  1563.           } catch (e) { }
  1564.         }
  1565.  
  1566.       }
  1567.  
  1568.  
  1569.       const { lcRendererElm, visObserver } = (() => {
  1570.  
  1571.  
  1572.  
  1573.         let lcRendererWR = null;
  1574.  
  1575.         const lcRendererElm = () => {
  1576.           let lcRenderer = kRef(lcRendererWR);
  1577.           if (!lcRenderer || !lcRenderer.isConnected) {
  1578.             lcRenderer = document.querySelector('yt-live-chat-item-list-renderer.yt-live-chat-renderer');
  1579.             lcRendererWR = lcRenderer ? mWeakRef(lcRenderer) : null;
  1580.           }
  1581.           return lcRenderer;
  1582.         };
  1583.  
  1584.  
  1585.         let hasFirstShowMore = false;
  1586.  
  1587.         const visObserverFn = (entry) => {
  1588.  
  1589.           const target = entry.target;
  1590.           if (!target) return;
  1591.           // if(target.classList.contains('dont-render')) return;
  1592.           let isVisible = entry.isIntersecting === true && entry.intersectionRatio > 0.5;
  1593.           // const h = entry.boundingClientRect.height;
  1594.           /*
  1595.           if (h < 16) { // wrong: 8 (padding/margin); standard: 32; test: 16 or 20
  1596.               // e.g. under fullscreen. the element created but not rendered.
  1597.               target.setAttribute('wSr93', '');
  1598.               return;
  1599.           }
  1600.           */
  1601.           if (isVisible) {
  1602.             // target.style.setProperty('--wsr94', h + 'px');
  1603.             target.setAttribute('wSr93', 'visible');
  1604.             if (nNextElem(target) === null) {
  1605.  
  1606.               // firstVisibleItemDetected = true;
  1607.               /*
  1608.                 if (dateNow() - lastScroll < 80) {
  1609.                     lastLShow = 0;
  1610.                     lastScroll = 0;
  1611.                     Promise.resolve().then(clickShowMore);
  1612.                 } else {
  1613.                     lastLShow = dateNow();
  1614.                 }
  1615.                 */
  1616.               // lastLShow = dateNow();
  1617.             } else if (!hasFirstShowMore) { // should more than one item being visible
  1618.               // implement inside visObserver to ensure there is sufficient delay
  1619.               hasFirstShowMore = true;
  1620.               requestAnimationFrame(() => {
  1621.                 // foreground page
  1622.                 // page visibly ready -> load the latest comments at initial loading
  1623.                 const lcRenderer = lcRendererElm();
  1624.                 if (lcRenderer) {
  1625.                   (lcRenderer.inst || lcRenderer).scrollToBottom_();
  1626.                 }
  1627.               });
  1628.             }
  1629.           }
  1630.           else if (target.getAttribute('wSr93') === 'visible') { // ignore target.getAttribute('wSr93') === '' to avoid wrong sizing
  1631.  
  1632.             // target.style.setProperty('--wsr94', h + 'px');
  1633.             target.setAttribute('wSr93', 'hidden');
  1634.           } // note: might consider 0 < entry.intersectionRatio < 0.5 and target.getAttribute('wSr93') === '' <new last item>
  1635.  
  1636.         }
  1637.  
  1638.  
  1639.  
  1640.         const visObserver = new IntersectionObserver((entries) => {
  1641.  
  1642.           for (const entry of entries) {
  1643.  
  1644.             Promise.resolve(entry).then(visObserverFn);
  1645.  
  1646.           }
  1647.  
  1648.         }, {
  1649.           // root: HTMLElement.prototype.closest.call(m2, '#item-scroller.yt-live-chat-item-list-renderer'), // nullable
  1650.           rootMargin: "0px",
  1651.           threshold: [0.05, 0.95],
  1652.         });
  1653.  
  1654.  
  1655.         return { lcRendererElm, visObserver }
  1656.  
  1657.  
  1658.       })();
  1659.  
  1660.       const { setupMutObserver } = (() => {
  1661.  
  1662.         const mutFn = (items) => {
  1663.           for (let node = nLastElem(items); node !== null; node = nPrevElem(node)) {
  1664.             if (node.hasAttribute('wSr93')) break;
  1665.             node.setAttribute('wSr93', '');
  1666.             visObserver.observe(node);
  1667.           }
  1668.         }
  1669.  
  1670.         const mutObserver = new MutationObserver((mutations) => {
  1671.           const items = (mutations[0] || 0).target;
  1672.           if (!items) return;
  1673.           mutFn(items);
  1674.         });
  1675.  
  1676.         const setupMutObserver = (m2) => {
  1677.           scrollChatFn = null;
  1678.           mutObserver.disconnect();
  1679.           mutObserver.takeRecords();
  1680.           if (m2) {
  1681.             if (typeof m2.__appendChild932__ === 'function') {
  1682.               if (typeof m2.appendChild === 'function') m2.appendChild = m2.__appendChild932__;
  1683.               if (typeof m2.__shady_native_appendChild === 'function') m2.__shady_native_appendChild = m2.__appendChild932__;
  1684.             }
  1685.             mutObserver.observe(m2, {
  1686.               childList: true,
  1687.               subtree: false
  1688.             });
  1689.             mutFn(m2);
  1690.  
  1691.  
  1692.             if (ENABLE_OVERFLOW_ANCHOR) {
  1693.  
  1694.               let items = m2;
  1695.               let addedAnchor = false;
  1696.               if (items) {
  1697.                 if (items.nextElementSibling === null) {
  1698.                   items.classList.add('no-anchor');
  1699.                   addedAnchor = true;
  1700.                   items.parentNode.appendChild(dr(document.createElement('item-anchor')));
  1701.                 }
  1702.               }
  1703.  
  1704.  
  1705.  
  1706.               if (addedAnchor) {
  1707.                 nodeParent(m2).classList.add('no-anchor'); // required
  1708.               }
  1709.  
  1710.             }
  1711.  
  1712.             // let div = document.createElement('div');
  1713.             // div.id = 'qwcc';
  1714.             // HTMLElement.prototype.appendChild.call(document.querySelector('yt-live-chat-item-list-renderer'), div )
  1715.             // bufferRegion =div;
  1716.  
  1717.             // buffObserver.takeRecords();
  1718.             // buffObserver.disconnect();
  1719.             // buffObserver.observe(div,  {
  1720.             //     childList: true,
  1721.             //     subtree: false
  1722.             // })
  1723.  
  1724.  
  1725.  
  1726.           }
  1727.         }
  1728.  
  1729.         return { setupMutObserver };
  1730.  
  1731.  
  1732.  
  1733.       })();
  1734.  
  1735.       const setupEvents = () => {
  1736.  
  1737.  
  1738.         let scrollCount = 0;
  1739.  
  1740.         const passiveCapture = typeof IntersectionObserver === 'function' ? { capture: true, passive: true } : true;
  1741.  
  1742.  
  1743.         const delayFlushActiveItemsAfterUserActionK_ = () => {
  1744.  
  1745.           const lcRenderer = lcRendererElm();
  1746.           if (lcRenderer) {
  1747.             const cnt = (lcRenderer.inst || lcRenderer);
  1748.             if (!cnt.hasUserJustInteracted11_) return;
  1749.             if (cnt.atBottom && cnt.allowScroll && cnt.activeItems_.length >= 1 && cnt.hasUserJustInteracted11_()) {
  1750.               cnt.delayFlushActiveItemsAfterUserAction11_ && cnt.delayFlushActiveItemsAfterUserAction11_();
  1751.             }
  1752.           }
  1753.  
  1754.         }
  1755.  
  1756.         document.addEventListener('scroll', (evt) => {
  1757.           if (!evt || !evt.isTrusted) return;
  1758.           // lastScroll = dateNow();
  1759.           if (++scrollCount > 1e9) scrollCount = 9;
  1760.         }, passiveCapture); // support contain => support passive
  1761.  
  1762.         let lastScrollCount = -1;
  1763.         document.addEventListener('wheel', (evt) => {
  1764.           if (!evt || !evt.isTrusted) return;
  1765.           if (lastScrollCount === scrollCount) return;
  1766.           lastScrollCount = scrollCount;
  1767.           lastWheel = dateNow();
  1768.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1769.         }, passiveCapture); // support contain => support passive
  1770.  
  1771.         document.addEventListener('mousedown', (evt) => {
  1772.           if (!evt || !evt.isTrusted) return;
  1773.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1774.           lastMouseDown = dateNow();
  1775.           currentMouseDown = true;
  1776.           lastUserInteraction = lastMouseDown;
  1777.         }, passiveCapture);
  1778.  
  1779.         document.addEventListener('pointerdown', (evt) => {
  1780.           if (!evt || !evt.isTrusted) return;
  1781.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1782.           lastMouseDown = dateNow();
  1783.           currentMouseDown = true;
  1784.           lastUserInteraction = lastMouseDown;
  1785.         }, passiveCapture);
  1786.  
  1787.         document.addEventListener('click', (evt) => {
  1788.           if (!evt || !evt.isTrusted) return;
  1789.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1790.           lastMouseDown = lastMouseUp = dateNow();
  1791.           currentMouseDown = false;
  1792.           lastUserInteraction = lastMouseDown;
  1793.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1794.         }, passiveCapture);
  1795.  
  1796.         document.addEventListener('tap', (evt) => {
  1797.           if (!evt || !evt.isTrusted) return;
  1798.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1799.           lastMouseDown = lastMouseUp = dateNow();
  1800.           currentMouseDown = false;
  1801.           lastUserInteraction = lastMouseDown;
  1802.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1803.         }, passiveCapture);
  1804.  
  1805.  
  1806.         document.addEventListener('mouseup', (evt) => {
  1807.           if (!evt || !evt.isTrusted) return;
  1808.           if (currentMouseDown) {
  1809.             lastMouseUp = dateNow();
  1810.             currentMouseDown = false;
  1811.             lastUserInteraction = lastMouseUp;
  1812.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1813.           }
  1814.         }, passiveCapture);
  1815.  
  1816.  
  1817.         document.addEventListener('pointerup', (evt) => {
  1818.           if (!evt || !evt.isTrusted) return;
  1819.           if (currentMouseDown) {
  1820.             lastMouseUp = dateNow();
  1821.             currentMouseDown = false;
  1822.             lastUserInteraction = lastMouseUp;
  1823.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1824.           }
  1825.         }, passiveCapture);
  1826.  
  1827.         document.addEventListener('touchstart', (evt) => {
  1828.           if (!evt || !evt.isTrusted) return;
  1829.           lastTouchDown = dateNow();
  1830.           currentTouchDown = true;
  1831.           lastUserInteraction = lastTouchDown;
  1832.         }, passiveCapture);
  1833.  
  1834.         document.addEventListener('touchmove', (evt) => {
  1835.           if (!evt || !evt.isTrusted) return;
  1836.           lastTouchDown = dateNow();
  1837.           currentTouchDown = true;
  1838.           lastUserInteraction = lastTouchDown;
  1839.         }, passiveCapture);
  1840.  
  1841.         document.addEventListener('touchend', (evt) => {
  1842.           if (!evt || !evt.isTrusted) return;
  1843.           if (currentTouchDown) {
  1844.             lastTouchUp = dateNow();
  1845.             currentTouchDown = false;
  1846.             lastUserInteraction = lastTouchUp;
  1847.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1848.           }
  1849.         }, passiveCapture);
  1850.  
  1851.         document.addEventListener('touchcancel', (evt) => {
  1852.           if (!evt || !evt.isTrusted) return;
  1853.           if (currentTouchDown) {
  1854.             lastTouchUp = dateNow();
  1855.             currentTouchDown = false;
  1856.             lastUserInteraction = lastTouchUp;
  1857.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1858.           }
  1859.         }, passiveCapture);
  1860.  
  1861.  
  1862.       }
  1863.  
  1864.  
  1865.       const onRegistryReadyForDOMOperations = () => {
  1866.         let firstCheckedOnYtInit = false;
  1867.  
  1868.         const mightFirstCheckOnYtInit = () => {
  1869.           if (firstCheckedOnYtInit) return;
  1870.           firstCheckedOnYtInit = true;
  1871.  
  1872.           if (!document.body || !document.head) return;
  1873.  
  1874.           if (!assertor(() => location.pathname.startsWith('/live_chat') && location.search.indexOf('continuation=') >= 0)) return;
  1875.  
  1876.           addCssManaged();
  1877.  
  1878.           let efsContainer = document.getElementById('elzm-fonts-yk75g');
  1879.           if (efsContainer && efsContainer.parentNode !== document.body) {
  1880.             document.body.appendChild(efsContainer);
  1881.           }
  1882.  
  1883.  
  1884.         }
  1885.  
  1886.         if (!assertor(() => location.pathname.startsWith('/live_chat') && location.search.indexOf('continuation=') >= 0)) return;
  1887.         // if (!assertor(() => document.getElementById('yt-masthead') === null)) return;
  1888.  
  1889.         if (document.documentElement && document.head) {
  1890.  
  1891.           addCssManaged();
  1892.  
  1893.         }
  1894.         // console.log(document.body===null)
  1895.  
  1896.         customElements.whenDefined('yt-live-chat-item-list-renderer').then(() => {
  1897.  
  1898.  
  1899.           const tag = "yt-live-chat-item-list-renderer"
  1900.           const dummy = document.createElement(tag);
  1901.  
  1902.  
  1903.           const cProto = getProto(dummy);
  1904.           if (!cProto || !cProto.attached) {
  1905.             console.warn(`proto.attached for ${tag} is unavailable.`);
  1906.             return;
  1907.           }
  1908.  
  1909.  
  1910.           mightFirstCheckOnYtInit();
  1911.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-item-list-renderer hacks");
  1912.           console.log("[Begin]");
  1913.  
  1914.           const mclp = cProto;
  1915.           try {
  1916.             assertor(() => typeof mclp.scrollToBottom_ === 'function');
  1917.             assertor(() => typeof mclp.flushActiveItems_ === 'function');
  1918.             assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  1919.             assertor(() => typeof mclp.setAtBottom === 'function');
  1920.             assertor(() => typeof mclp.scrollToBottom66_ === 'undefined');
  1921.             assertor(() => typeof mclp.flushActiveItems66_ === 'undefined');
  1922.           } catch (e) { }
  1923.  
  1924.  
  1925.           try {
  1926.             assertor(() => typeof mclp.attached === 'function');
  1927.             assertor(() => typeof mclp.detached === 'function');
  1928.             assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  1929.             assertor(() => typeof mclp.isSmoothScrollEnabled_ === 'function');
  1930.             assertor(() => typeof mclp.maybeResizeScrollContainer_ === 'function');
  1931.             assertor(() => typeof mclp.refreshOffsetContainerHeight_ === 'function');
  1932.             assertor(() => typeof mclp.smoothScroll_ === 'function');
  1933.             assertor(() => typeof mclp.resetSmoothScroll_ === 'function');
  1934.           } catch (e) { }
  1935.  
  1936.           mclp.__intermediate_delay__ = null;
  1937.  
  1938.           let mzk = 0;
  1939.           let myk = 0;
  1940.           let mlf = 0;
  1941.           let myw = 0;
  1942.           let mzt = 0;
  1943.           let zarr = null;
  1944.           let mlg = 0;
  1945.  
  1946.           if ((mclp.clearList || 0).length === 0) {
  1947.             assertor(() => fnIntegrity(mclp.clearList, '0.106.50'));
  1948.             mclp.clearList66 = mclp.clearList;
  1949.             mclp.clearList = function () {
  1950.               mzk++;
  1951.               myk++;
  1952.               mlf++;
  1953.               myw++;
  1954.               mzt++;
  1955.               mlg++;
  1956.               zarr = null;
  1957.               this.__intermediate_delay__ = null;
  1958.               this.clearList66();
  1959.             };
  1960.             console.log("clearList", "OK");
  1961.           } else {
  1962.             console.log("clearList", "NG");
  1963.           }
  1964.  
  1965.  
  1966.           let onListRendererAttachedDone = false;
  1967.  
  1968.           function setList(itemOffset, items) {
  1969.  
  1970.             const isFirstTime = onListRendererAttachedDone === false;
  1971.  
  1972.             if (isFirstTime) {
  1973.               onListRendererAttachedDone = true;
  1974.               Promise.resolve().then(watchUserCSS);
  1975.               addCssManaged();
  1976.               setupEvents();
  1977.             }
  1978.  
  1979.             setupStyle(itemOffset, items);
  1980.  
  1981.             setupMutObserver(items);
  1982.           }
  1983.  
  1984.           mclp.attached419 = async function () {
  1985.  
  1986.             if (!this.isAttached) return;
  1987.  
  1988.             let maxTrial = 16;
  1989.             while (!this.$ || !this.$['item-scroller'] || !this.$['item-offset'] || !this.$['items']) {
  1990.               if (--maxTrial < 0 || !this.isAttached) return;
  1991.               await new Promise(requestAnimationFrame);
  1992.             }
  1993.  
  1994.             if (this.isAttached !== true) return;
  1995.  
  1996.             if (!this.$) {
  1997.               console.warn("!this.$");
  1998.               return;
  1999.             }
  2000.             if (!this.$) return;
  2001.             /** @type {HTMLElement | null} */
  2002.             const itemScroller = this.$['item-scroller'];
  2003.             /** @type {HTMLElement | null} */
  2004.             const itemOffset = this.$['item-offset'];
  2005.             /** @type {HTMLElement | null} */
  2006.             const items = this.$['items'];
  2007.  
  2008.             if (!itemScroller || !itemOffset || !items) {
  2009.               console.warn("items.parentNode !== itemOffset");
  2010.               return;
  2011.             }
  2012.  
  2013.             if (nodeParent(items) !== itemOffset) {
  2014.  
  2015.               console.warn("items.parentNode !== itemOffset");
  2016.               return;
  2017.             }
  2018.  
  2019.  
  2020.             if (items.id !== 'items' || itemOffset.id !== "item-offset") {
  2021.  
  2022.               console.warn("id incorrect");
  2023.               return;
  2024.             }
  2025.  
  2026.             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')
  2027.  
  2028.             if (!isTargetItems) {
  2029.               console.warn("!isTargetItems");
  2030.               return;
  2031.             }
  2032.  
  2033.             setList(itemOffset, items);
  2034.  
  2035.           }
  2036.  
  2037.           mclp.attached331 = mclp.attached;
  2038.           mclp.attached = function () {
  2039.             this.attached419 && this.attached419();
  2040.             return this.attached331();
  2041.           }
  2042.  
  2043.           mclp.detached331 = mclp.detached;
  2044.  
  2045.           mclp.detached = function () {
  2046.             setupMutObserver();
  2047.             return this.detached331();
  2048.           }
  2049.  
  2050.           const t29s = document.querySelectorAll("yt-live-chat-item-list-renderer");
  2051.           for (const t29 of t29s) {
  2052.             if ((t29.inst || t29).isAttached === true) {
  2053.               t29.attached419();
  2054.             }
  2055.           }
  2056.  
  2057.           if ((mclp.async || 0).length === 2 && (mclp.cancelAsync || 0).length === 1) {
  2058.  
  2059.             assertor(() => fnIntegrity(mclp.async, '2.24.15'));
  2060.             assertor(() => fnIntegrity(mclp.cancelAsync, '1.15.8'));
  2061.  
  2062.             /** @type {Map<number, any>} */
  2063.             const aMap = new Map();
  2064.             let count = 6150;
  2065.             mclp.async66 = mclp.async;
  2066.             mclp.async = function (e, f) {
  2067.               // ensure the previous operation is done
  2068.               // .async is usually after the time consuming functions like flushActiveItems_ and scrollToBottom_
  2069.               const hasF = arguments.length === 2;
  2070.               const stack = new Error().stack;
  2071.               const isFlushAsync = stack.indexOf('flushActiveItems_') >= 0;
  2072.               if (count > 1e9) count = 6159;
  2073.               const resId = ++count;
  2074.               aMap.set(resId, e);
  2075.               (this.__intermediate_delay__ || Promise.resolve()).then(rk => {
  2076.                 const rp = aMap.get(resId);
  2077.                 if (typeof rp !== 'function') {
  2078.                   return;
  2079.                 }
  2080.                 let cancelCall = false;
  2081.                 if (isFlushAsync) {
  2082.                   if (rk < 0) {
  2083.                     cancelCall = true;
  2084.                   } else if (rk === 2 && arguments[0] === this.maybeScrollToBottom_) {
  2085.                     cancelCall = true;
  2086.                   }
  2087.                 }
  2088.                 if (cancelCall) {
  2089.                   aMap.delete(resId);
  2090.                 } else {
  2091.                   const asyncEn = function () {
  2092.                     aMap.delete(resId);
  2093.                     return rp.apply(this, arguments);
  2094.                   };
  2095.                   aMap.set(resId, hasF ? this.async66(asyncEn, f) : this.async66(asyncEn));
  2096.                 }
  2097.               });
  2098.  
  2099.               return resId;
  2100.             }
  2101.  
  2102.             mclp.cancelAsync66 = mclp.cancelAsync;
  2103.             mclp.cancelAsync = function (resId) {
  2104.               if (resId <= 6150) {
  2105.                 this.cancelAsync66(resId);
  2106.               } else if (aMap.has(resId)) {
  2107.                 const rp = aMap.get(resId);
  2108.                 aMap.delete(resId);
  2109.                 if (typeof rp !== 'function') {
  2110.                   this.cancelAsync66(rp);
  2111.                 }
  2112.               }
  2113.             }
  2114.  
  2115.             console.log("async", "OK");
  2116.           } else {
  2117.             console.log("async", "NG");
  2118.           }
  2119.  
  2120.  
  2121.           if ((mclp.showNewItems_ || 0).length === 0 && ENABLE_NO_SMOOTH_TRANSFORM) {
  2122.  
  2123.             assertor(() => fnIntegrity(mclp.showNewItems_, '0.170.79'));
  2124.             mclp.showNewItems66_ = mclp.showNewItems_;
  2125.  
  2126.             mclp.showNewItems77_ = async function () {
  2127.               if (myk > 1e9) myk = 9;
  2128.               let tid = ++myk;
  2129.  
  2130.               await new Promise(requestAnimationFrame);
  2131.  
  2132.               if (tid !== myk) {
  2133.                 return;
  2134.               }
  2135.  
  2136.               const cnt = this;
  2137.  
  2138.               await Promise.resolve();
  2139.               cnt.showNewItems66_();
  2140.  
  2141.               await Promise.resolve();
  2142.  
  2143.             }
  2144.  
  2145.             mclp.showNewItems_ = function () {
  2146.  
  2147.               const cnt = this;
  2148.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2149.                 cnt.showNewItems77_().then(() => {
  2150.                   resolve();
  2151.                 });
  2152.               });
  2153.             }
  2154.  
  2155.             console.log("showNewItems_", "OK");
  2156.           } else {
  2157.             console.log("showNewItems_", "NG");
  2158.           }
  2159.  
  2160.  
  2161.           if ((mclp.flushActiveItems_ || 0).length === 0) {
  2162.  
  2163.             assertor(() => fnIntegrity(mclp.flushActiveItems_, '0.137.81'));
  2164.  
  2165.             let contensWillChangeController = null;
  2166.  
  2167.             mclp.flushActiveItems66_ = mclp.flushActiveItems_;
  2168.  
  2169.             mclp.flushActiveItems78_ = async function (tid) {
  2170.               try {
  2171.                 const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  2172.                 let logger = false;
  2173.                 const cnt = this;
  2174.                 let immd = cnt.__intermediate_delay__;
  2175.                 await new Promise(requestAnimationFrame);
  2176.  
  2177.                 if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2178.                 if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
  2179.  
  2180.                 mlf++;
  2181.                 if (mlg > 1e9) mlg = 9;
  2182.                 ++mlg;
  2183.  
  2184.                 const tmpMaxItemsCount = this.data.maxItemsToDisplay;
  2185.                 const reducedMaxItemsToDisplay = MAX_ITEMS_FOR_FULL_FLUSH;
  2186.                 let changeMaxItemsToDisplay = false;
  2187.                 const activeItemsLen = this.activeItems_.length;
  2188.                 if (activeItemsLen > tmpMaxItemsCount && tmpMaxItemsCount > 0) {
  2189.                   logger = true;
  2190.  
  2191.                   groupCollapsed("YouTube Super Fast Chat", " | flushActiveItems78_");
  2192.  
  2193.                   logger && console.log('[Begin]')
  2194.  
  2195.                   console.log('this.activeItems_.length > N', activeItemsLen, tmpMaxItemsCount);
  2196.                   if (ENABLE_REDUCED_MAXITEMS_FOR_FLUSH && lockedMaxItemsToDisplay === tmpMaxItemsCount && lockedMaxItemsToDisplay !== reducedMaxItemsToDisplay) {
  2197.                     console.log('reduce maxitems');
  2198.                     if (tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  2199.                       // as all the rendered chats are already "outdated"
  2200.                       // all old chats shall remove and reduced number of few chats will be rendered
  2201.                       // then restore to the original number
  2202.                       changeMaxItemsToDisplay = true;
  2203.                       this.data.maxItemsToDisplay = reducedMaxItemsToDisplay;
  2204.                       console.log(`'maxItemsToDisplay' is reduced from ${tmpMaxItemsCount} to ${reducedMaxItemsToDisplay}.`)
  2205.                     }
  2206.                     this.activeItems_.splice(0, activeItemsLen - this.data.maxItemsToDisplay);
  2207.                     //   console.log('changeMaxItemsToDisplay 01', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  2208.  
  2209.                     console.log('new this.activeItems_.length > N', this.activeItems_.length);
  2210.                   } else {
  2211.                     this.activeItems_.splice(0, activeItemsLen - (tmpMaxItemsCount < 900 ? tmpMaxItemsCount : 900));
  2212.  
  2213.                     console.log('new this.activeItems_.length > N', this.activeItems_.length);
  2214.                   }
  2215.                 }
  2216.                 // it is found that it will render all stacked chats after switching back from background
  2217.                 // to avoid lagging in popular livestream with massive chats, trim first before rendering.
  2218.                 // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
  2219.  
  2220.  
  2221.                 const items = (cnt.$ || 0).items;
  2222.  
  2223.                 if (USE_WILL_CHANGE_CONTROLLER) {
  2224.                   if (contensWillChangeController && contensWillChangeController.element !== items) {
  2225.                     contensWillChangeController.release();
  2226.                     contensWillChangeController = null;
  2227.                   }
  2228.                   if (!contensWillChangeController) contensWillChangeController = new WillChangeController(items, 'contents');
  2229.                 }
  2230.                 const wcController = contensWillChangeController;
  2231.                 cnt.__intermediate_delay__ = Promise.all([cnt.__intermediate_delay__ || null, immd || null]);
  2232.                 wcController && wcController.beforeOper();
  2233.                 await Promise.resolve();
  2234.                 const len1 = cnt.activeItems_.length;
  2235.                 cnt.flushActiveItems66_();
  2236.                 const len2 = cnt.activeItems_.length;
  2237.                 const bAsync = len1 !== len2;
  2238.                 await Promise.resolve();
  2239.                 if (wcController) {
  2240.                   if (bAsync) {
  2241.                     cnt.async(() => {
  2242.                       wcController.afterOper();
  2243.                     });
  2244.                   } else {
  2245.                     wcController.afterOper();
  2246.                   }
  2247.                 }
  2248.                 if (changeMaxItemsToDisplay && this.data.maxItemsToDisplay === reducedMaxItemsToDisplay && tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  2249.                   this.data.maxItemsToDisplay = tmpMaxItemsCount;
  2250.  
  2251.                   logger && console.log(`'maxItemsToDisplay' is restored from ${reducedMaxItemsToDisplay} to ${tmpMaxItemsCount}.`);
  2252.                   //   console.log('changeMaxItemsToDisplay 02', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  2253.                 } else if (changeMaxItemsToDisplay) {
  2254.  
  2255.                   logger && console.log(`'maxItemsToDisplay' cannot be restored`, {
  2256.                     maxItemsToDisplay: this.data.maxItemsToDisplay,
  2257.                     reducedMaxItemsToDisplay,
  2258.                     originalMaxItemsToDisplay: tmpMaxItemsCount
  2259.                   });
  2260.                 }
  2261.                 logger && console.log('[End]')
  2262.  
  2263.                 logger && console.groupEnd();
  2264.  
  2265.                 if (!ENABLE_NO_SMOOTH_TRANSFORM) {
  2266.  
  2267.  
  2268.                   const ff = () => {
  2269.  
  2270.                     if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2271.                     //   if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2272.                     if (!cnt.atBottom && cnt.allowScroll && cnt.hasUserJustInteracted11_ && !cnt.hasUserJustInteracted11_()) {
  2273.                       cnt.scrollToBottom_();
  2274.  
  2275.                       Promise.resolve().then(() => {
  2276.  
  2277.                         if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2278.                         if (!cnt.canScrollToBottom_()) cnt.scrollToBottom_();
  2279.                       });
  2280.  
  2281.  
  2282.                     }
  2283.                   }
  2284.  
  2285.                   ff();
  2286.  
  2287.  
  2288.                   Promise.resolve().then(ff);
  2289.  
  2290.                   // requestAnimationFrame(ff);
  2291.                 } else if (true) { // it might not be sticky to bottom when there is a full refresh.
  2292.  
  2293.                   const knt = cnt;
  2294.                   if (!scrollChatFn) {
  2295.                     const cnt = knt;
  2296.                     const f = () => {
  2297.                       const itemScroller = cnt.itemScroller;
  2298.                       if (!itemScroller || itemScroller.isConnected === false || cnt.isAttached === false) return;
  2299.                       if (!cnt.atBottom) {
  2300.                         cnt.scrollToBottom_();
  2301.                       } else if (itemScroller.scrollTop === 0) { // not yet interacted by user; cannot stick to bottom
  2302.                         itemScroller.scrollTop = itemScroller.scrollHeight;
  2303.                       }
  2304.                     };
  2305.                     scrollChatFn = () => Promise.resolve().then(f).then(f);
  2306.                   }
  2307.  
  2308.                   if (!ENABLE_FULL_RENDER_REQUIRED) scrollChatFn();
  2309.                 }
  2310.  
  2311.                 return 1;
  2312.  
  2313.  
  2314.               } catch (e) {
  2315.                 console.warn(e);
  2316.               }
  2317.             }
  2318.  
  2319.             mclp.flushActiveItems77_ = async function () {
  2320.               try {
  2321.  
  2322.                 const cnt = this;
  2323.                 if (mlf > 1e9) mlf = 9;
  2324.                 let tid = ++mlf;
  2325.                 if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2326.                 if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
  2327.  
  2328.                 // 4 times to maxItems to avoid frequent trimming.
  2329.                 // 1 ... 10 ... 20 ... 30 ... 40 ... 50 ... 60 => 16 ... 20 ... 30 ..... 60 ... => 16
  2330.  
  2331.                 const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  2332.                 this.activeItems_.length > lockedMaxItemsToDisplay * 4 && lockedMaxItemsToDisplay > 4 && this.activeItems_.splice(0, this.activeItems_.length - lockedMaxItemsToDisplay - 1);
  2333.                 if (cnt.canScrollToBottom_()) {
  2334.                   if (cnt.mutexPromiseFA77) await cnt.mutexPromiseFA77;
  2335.                   if (tid !== mlf) return;
  2336.                   let qResolve = null;
  2337.                   cnt.mutexPromiseFA77 = new Promise(resolve => { qResolve = resolve; })
  2338.                   let res;
  2339.                   try {
  2340.                     res = await cnt.flushActiveItems78_(tid);
  2341.                   } catch (e) {
  2342.                     console.warn(e);
  2343.                   }
  2344.                   qResolve && qResolve();
  2345.                   return res;
  2346.                 } else {
  2347.                   // cnt.flushActiveItems66_();
  2348.                   // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
  2349.                   return 2;
  2350.                 }
  2351.               } catch (e) {
  2352.                 console.warn(e);
  2353.               }
  2354.             }
  2355.  
  2356.             mclp.flushActiveItems_ = function () {
  2357.               const cnt = this;
  2358.  
  2359.               if (arguments.length !== 0 || !cnt.activeItems_ || !cnt.canScrollToBottom_) return cnt.flushActiveItems66_.apply(this, arguments);
  2360.  
  2361.               if (cnt.activeItems_.length === 0) {
  2362.                 cnt.__intermediate_delay__ = null;
  2363.                 return;
  2364.               }
  2365.  
  2366.               const cntData = ((cnt || 0).data || 0);
  2367.               if (cntData.maxItemsToDisplay944 === undefined) {
  2368.                 cntData.maxItemsToDisplay944 = null;
  2369.                 if (cntData.maxItemsToDisplay > MAX_ITEMS_FOR_TOTAL_DISPLAY) cntData.maxItemsToDisplay = MAX_ITEMS_FOR_TOTAL_DISPLAY;
  2370.                 cntData.maxItemsToDisplay944 = cntData.maxItemsToDisplay || null;
  2371.               }
  2372.  
  2373.               // ignore previous __intermediate_delay__ and create a new one
  2374.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2375.                 cnt.flushActiveItems77_().then(rt => {
  2376.                   if (rt === 1) resolve(1); // success, scroll to bottom
  2377.                   else if (rt === 2) resolve(2); // success, trim
  2378.                   else resolve(-1); // skip
  2379.                 });
  2380.               });
  2381.  
  2382.             }
  2383.             console.log("flushActiveItems_", "OK");
  2384.           } else {
  2385.             console.log("flushActiveItems_", "NG");
  2386.           }
  2387.  
  2388.           mclp.delayFlushActiveItemsAfterUserAction11_ = async function () {
  2389.             try {
  2390.               if (mlg > 1e9) mlg = 9;
  2391.               const tid = ++mlg;
  2392.               const keepTrialCond = () => this.atBottom && this.allowScroll && (tid === mlg) && this.isAttached === true && this.activeItems_.length >= 1 && (this.hostElement || 0).isConnected === true;
  2393.               const runCond = () => this.canScrollToBottom_();
  2394.               if (!keepTrialCond()) return;
  2395.               if (runCond()) return this.flushActiveItems_() | 1; // avoid return promise
  2396.               await new Promise(r => setTimeout(r, 80));
  2397.               if (!keepTrialCond()) return;
  2398.               if (runCond()) return this.flushActiveItems_() | 1;
  2399.               await new Promise(requestAnimationFrame);
  2400.               if (runCond()) return this.flushActiveItems_() | 1;
  2401.             } catch (e) {
  2402.               console.warn(e);
  2403.             }
  2404.           }
  2405.  
  2406.           if ((mclp.atBottomChanged_ || 0).length === 1) {
  2407.             // note: if the scrolling is too frequent, the show more visibility might get wrong.
  2408.             assertor(() => fnIntegrity(mclp.atBottomChanged_, '1.75.39'));
  2409.  
  2410.             const querySelector = HTMLElement.prototype.querySelector;
  2411.             const U = (element) => ({
  2412.               querySelector: (selector) => querySelector.call(element, selector)
  2413.             });
  2414.  
  2415.             let qid = 0;
  2416.             mclp.atBottomChanged_ = function (a) {
  2417.               let tid = ++qid;
  2418.               var b = this;
  2419.               a ? this.hideShowMoreAsync_ || (this.hideShowMoreAsync_ = this.async(function () {
  2420.                 if (tid !== qid) return;
  2421.                 U(b.hostElement).querySelector("#show-more").style.visibility = "hidden"
  2422.               }, 200)) : (this.hideShowMoreAsync_ && this.cancelAsync(this.hideShowMoreAsync_),
  2423.                 this.hideShowMoreAsync_ = null,
  2424.                 U(this.hostElement).querySelector("#show-more").style.visibility = "visible")
  2425.             }
  2426.  
  2427.             console.log("atBottomChanged_", "OK");
  2428.           } else {
  2429.             console.log("atBottomChanged_", "NG");
  2430.           }
  2431.  
  2432.           if ((mclp.onScrollItems_ || 0).length === 1) {
  2433.  
  2434.             assertor(() => fnIntegrity(mclp.onScrollItems_, '1.17.9'));
  2435.             mclp.onScrollItems66_ = mclp.onScrollItems_;
  2436.             mclp.onScrollItems77_ = async function (evt) {
  2437.               if (myw > 1e9) myw = 9;
  2438.               let tid = ++myw;
  2439.  
  2440.               await new Promise(requestAnimationFrame);
  2441.  
  2442.               if (tid !== myw) {
  2443.                 return;
  2444.               }
  2445.  
  2446.               const cnt = this;
  2447.  
  2448.               await Promise.resolve();
  2449.               if (USE_OPTIMIZED_ON_SCROLL_ITEMS) {
  2450.                 await Promise.resolve().then(() => {
  2451.                   this.ytRendererBehavior.onScroll(evt);
  2452.                 }).then(() => {
  2453.                   if (this.canScrollToBottom_()) {
  2454.                     const hasUserJustInteracted = this.hasUserJustInteracted11_ ? this.hasUserJustInteracted11_() : true;
  2455.                     if (hasUserJustInteracted) {
  2456.                       // only when there is an user action
  2457.                       this.setAtBottom();
  2458.                       return 1;
  2459.                     }
  2460.                   } else {
  2461.                     // no message inserting
  2462.                     this.setAtBottom();
  2463.                     return 1;
  2464.                   }
  2465.                 }).then((r) => {
  2466.  
  2467.                   if (this.activeItems_.length) {
  2468.  
  2469.                     if (this.canScrollToBottom_()) {
  2470.                       this.flushActiveItems_();
  2471.                       return 1 && r;
  2472.                     } else if (this.atBottom && this.allowScroll && (this.hasUserJustInteracted11_ && this.hasUserJustInteracted11_())) {
  2473.                       // delayed due to user action
  2474.                       this.delayFlushActiveItemsAfterUserAction11_ && this.delayFlushActiveItemsAfterUserAction11_();
  2475.                       return 0;
  2476.                     }
  2477.                   }
  2478.                 }).then((r) => {
  2479.                   if (r) {
  2480.                     // ensure setAtBottom is correctly set
  2481.                     this.setAtBottom();
  2482.                   }
  2483.                 });
  2484.               } else {
  2485.                 cnt.onScrollItems66_(evt);
  2486.               }
  2487.  
  2488.               await Promise.resolve();
  2489.  
  2490.             }
  2491.  
  2492.             mclp.onScrollItems_ = function (evt) {
  2493.  
  2494.               const cnt = this;
  2495.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2496.                 cnt.onScrollItems77_(evt).then(() => {
  2497.                   resolve();
  2498.                 });
  2499.               });
  2500.             }
  2501.             console.log("onScrollItems_", "OK");
  2502.           } else {
  2503.             console.log("onScrollItems_", "NG");
  2504.           }
  2505.  
  2506.           if ((mclp.handleLiveChatActions_ || 0).length === 1) {
  2507.  
  2508.             assertor(() => fnIntegrity(mclp.handleLiveChatActions_, '1.31.17'));
  2509.             mclp.handleLiveChatActions66_ = mclp.handleLiveChatActions_;
  2510.  
  2511.             mclp.handleLiveChatActions77_ = async function (arr) {
  2512.               if (typeof (arr || 0).length !== 'number') {
  2513.                 this.handleLiveChatActions66_(arr);
  2514.                 return;
  2515.               }
  2516.               if (mzt > 1e9) mzt = 9;
  2517.               let tid = ++mzt;
  2518.  
  2519.               if (zarr === null) zarr = arr;
  2520.               else Array.prototype.push.apply(zarr, arr);
  2521.               arr = null;
  2522.  
  2523.               await new Promise(requestAnimationFrame);
  2524.  
  2525.               if (tid !== mzt || zarr === null) {
  2526.                 return;
  2527.               }
  2528.  
  2529.               const carr = zarr;
  2530.               zarr = null;
  2531.  
  2532.               await Promise.resolve();
  2533.               this.handleLiveChatActions66_(carr);
  2534.               await Promise.resolve();
  2535.  
  2536.             }
  2537.  
  2538.             mclp.handleLiveChatActions_ = function (arr) {
  2539.  
  2540.               const cnt = this;
  2541.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2542.                 cnt.handleLiveChatActions77_(arr).then(() => {
  2543.                   resolve();
  2544.                 });
  2545.               });
  2546.             }
  2547.             console.log("handleLiveChatActions_", "OK");
  2548.           } else {
  2549.             console.log("handleLiveChatActions_", "NG");
  2550.           }
  2551.  
  2552.           mclp.hasUserJustInteracted11_ = () => {
  2553.             const t = dateNow();
  2554.             return (t - lastWheel < 80) || currentMouseDown || currentTouchDown || (t - lastUserInteraction < 80);
  2555.           }
  2556.  
  2557.           if ((mclp.canScrollToBottom_ || 0).length === 0) {
  2558.  
  2559.             assertor(() => fnIntegrity(mclp.canScrollToBottom_, '0.9.5'));
  2560.  
  2561.             mclp.canScrollToBottom_ = function () {
  2562.               return this.atBottom && this.allowScroll && !this.hasUserJustInteracted11_();
  2563.             }
  2564.  
  2565.             console.log("canScrollToBottom_", "OK");
  2566.           } else {
  2567.             console.log("canScrollToBottom_", "NG");
  2568.           }
  2569.  
  2570.           if (ENABLE_NO_SMOOTH_TRANSFORM) {
  2571.  
  2572.             mclp.isSmoothScrollEnabled_ = function () {
  2573.               return false;
  2574.             }
  2575.  
  2576.             mclp.maybeResizeScrollContainer_ = function () {
  2577.               //
  2578.             }
  2579.  
  2580.             mclp.refreshOffsetContainerHeight_ = function () {
  2581.               //
  2582.             }
  2583.  
  2584.             mclp.smoothScroll_ = function () {
  2585.               //
  2586.             }
  2587.  
  2588.             mclp.resetSmoothScroll_ = function () {
  2589.               //
  2590.             }
  2591.             console.log("ENABLE_NO_SMOOTH_TRANSFORM", "OK");
  2592.           } else {
  2593.             console.log("ENABLE_NO_SMOOTH_TRANSFORM", "NG");
  2594.           }
  2595.  
  2596.           console.log("[End]");
  2597.           console.groupEnd();
  2598.  
  2599.         });
  2600.  
  2601.  
  2602.         const tickerContainerSetAttribute = function (attrName, attrValue) { // ensure '14.30000001%'.toFixed(1)
  2603.  
  2604.           let yd = (this.__dataHost || (this.inst || 0).__dataHost || 0).__data;
  2605.  
  2606.           if (arguments.length === 2 && attrName === 'style' && yd && attrValue) {
  2607.  
  2608.             // let v = yd.containerStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_;
  2609.             let v = `${attrValue}`;
  2610.             // conside a ticker is 101px width
  2611.             // 1% = 1.01px
  2612.             // 0.2% = 0.202px
  2613.  
  2614.  
  2615.             const ratio1 = (yd.ratio * 100);
  2616.             if (ratio1 > -1) { // avoid NaN
  2617.  
  2618.               // countdownDurationMs
  2619.               // 600000 - 0.2%    <1% = 6s>  <0.2% = 1.2s>
  2620.               // 300000 - 0.5%    <1% = 3s>  <0.5% = 1.5s>
  2621.               // 150000 - 1%    <1% = 1.5s>
  2622.               // 75000 - 2%    <1% =0.75s > <2% = 1.5s>
  2623.               // 30000 - 5%    <1% =0.3s > <5% = 1.5s>
  2624.  
  2625.               // 99px * 5% = 4.95px
  2626.  
  2627.               // 15000 - 10%    <1% =0.15s > <10% = 1.5s>
  2628.  
  2629.  
  2630.               // 1% Duration
  2631.  
  2632.               let ratio2 = ratio1;
  2633.  
  2634.               const ydd = yd.data;
  2635.               const d1 = ydd.durationSec;
  2636.               const d2 = ydd.fullDurationSec;
  2637.  
  2638.               if (d1 === d2 && d1 > 1) {
  2639.  
  2640.                 if (d1 > 400) ratio2 = Math.round(ratio2 * 5) / 5; // 0.2%
  2641.                 else if (d1 > 200) ratio2 = Math.round(ratio2 * 2) / 2; // 0.5%
  2642.                 else if (d1 > 100) ratio2 = Math.round(ratio2 * 1) / 1; // 1%
  2643.                 else if (d1 > 50) ratio2 = Math.round(ratio2 * 0.5) / 0.5; // 2%
  2644.                 else if (d1 > 25) ratio2 = Math.round(ratio2 * 0.2) / 0.2; // 5% (max => 99px * 5% = 4.95px)
  2645.                 else ratio2 = Math.round(ratio2 * 0.2) / 0.2;
  2646.  
  2647.               } else {
  2648.                 ratio2 = Math.round(ratio2 * 5) / 5; // 0.2% (min)
  2649.               }
  2650.  
  2651.               // ratio2 = Math.round(ratio2 * 5) / 5;
  2652.               ratio2 = ratio2.toFixed(1);
  2653.               v = v.replace(`${ratio1}%`, `${ratio2}%`).replace(`${ratio1}%`, `${ratio2}%`);
  2654.  
  2655.               if (yd.__style_last__ === v) return;
  2656.               yd.__style_last__ = v;
  2657.               // do not consider any delay here.
  2658.               // it shall be inside the looping for all properties changes. all the css background ops are in the same microtask.
  2659.  
  2660.             }
  2661.  
  2662.             HTMLElement.prototype.setAttribute.call(dr(this), attrName, v);
  2663.  
  2664.  
  2665.           } else {
  2666.             HTMLElement.prototype.setAttribute.apply(dr(this), arguments);
  2667.           }
  2668.  
  2669.         };
  2670.  
  2671.  
  2672.         const fpTicker = (renderer) => {
  2673.           const cnt = renderer.inst || renderer;
  2674.           assertor(() => typeof (cnt || 0).is === 'string');
  2675.           assertor(() => ((cnt || 0).hostElement || 0).nodeType === 1);
  2676.           const container = (cnt.$ || 0).container;
  2677.           if (container) {
  2678.             assertor(() => (container || 0).nodeType === 1);
  2679.             assertor(() => typeof container.setAttribute === 'function');
  2680.             container.setAttribute = tickerContainerSetAttribute;
  2681.           } else {
  2682.             console.warn(`"container" does not exist in ${cnt.is}`);
  2683.           }
  2684.         };
  2685.  
  2686.         const tags = ["yt-live-chat-ticker-paid-message-item-renderer", "yt-live-chat-ticker-paid-sticker-item-renderer",
  2687.           "yt-live-chat-ticker-renderer", "yt-live-chat-ticker-sponsor-item-renderer"];
  2688.  
  2689.  
  2690.         Promise.all(tags.map(tag => customElements.whenDefined(tag))).then(() => {
  2691.  
  2692.           mightFirstCheckOnYtInit();
  2693.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-... hacks");
  2694.           console.log("[Begin]");
  2695.  
  2696.           for (const tag of tags) {
  2697.             const dummy = document.createElement(tag);
  2698.  
  2699.             const cProto = getProto(dummy);
  2700.             if (!cProto || !cProto.attached) {
  2701.               console.warn(`proto.attached for ${tag} is unavailable.`);
  2702.               continue;
  2703.             }
  2704.  
  2705.             cProto.attached77 = cProto.attached;
  2706.  
  2707.             cProto.attached = function () {
  2708.               fpTicker(this.hostElement || this);
  2709.               return this.attached77();
  2710.             }
  2711.  
  2712.             for (const elm of document.getElementsByTagName(tag)) {
  2713.               if ((elm || elm.inst).isAttached === true) {
  2714.                 fpTicker(elm);
  2715.               }
  2716.             }
  2717.  
  2718.             if (ENABLE_RAF_HACK_TICKERS && rafHub !== null) {
  2719.  
  2720.               // cancelable - this.rafId < isAnimationPausedChanged >
  2721.  
  2722.               let doHack = false;
  2723.  
  2724.               if (typeof cProto.startCountdown === 'function' && typeof cProto.updateTimeout === 'function' && typeof cProto.isAnimationPausedChanged === 'function') {
  2725.  
  2726.                 console.log('startCountdown', typeof cProto.startCountdown)
  2727.                 console.log('updateTimeout', typeof cProto.updateTimeout)
  2728.                 console.log('isAnimationPausedChanged', typeof cProto.isAnimationPausedChanged)
  2729.  
  2730.                 doHack = fnIntegrity(cProto.startCountdown, '2.66.37') && fnIntegrity(cProto.updateTimeout, '1.76.45') && fnIntegrity(cProto.isAnimationPausedChanged, '2.56.30')
  2731.  
  2732.               }
  2733.               if (doHack) {
  2734.  
  2735.                 cProto.startCountdown = function (a, b) {
  2736.                   // console.log('cProto.startCountdown', tag) // yt-live-chat-ticker-sponsor-item-renderer
  2737.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2738.                   b = void 0 === b ? 0 : b;
  2739.                   void 0 !== a && (this.countdownMs = 1E3 * a,
  2740.                     this.countdownDurationMs = b ? 1E3 * b : this.countdownMs,
  2741.                     this.ratio = 1,
  2742.                     this.lastCountdownTimeMs || this.isAnimationPaused || (this.lastCountdownTimeMs = performance.now(),
  2743.                       this.rafId = rafHub.request(this.boundUpdateTimeout37_)))
  2744.                 };
  2745.  
  2746.                 cProto.updateTimeout = function (a) {
  2747.                   // console.log('cProto.updateTimeout', tag) // yt-live-chat-ticker-sponsor-item-renderer
  2748.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2749.                   this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
  2750.                   this.ratio = this.countdownMs / this.countdownDurationMs;
  2751.                   this.isAttached && this.countdownMs ? (this.lastCountdownTimeMs = a,
  2752.                     this.rafId = rafHub.request(this.boundUpdateTimeout37_)) : (this.lastCountdownTimeMs = null,
  2753.                       this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
  2754.                         this.slideDown()))
  2755.                 };
  2756.  
  2757.                 cProto.isAnimationPausedChanged = function (a, b) {
  2758.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2759.                   a ? rafHub.cancel(this.rafId) : !a && b && (a = this.lastCountdownTimeMs || 0,
  2760.                     this.detlaSincePausedSecs && (a = (this.lastCountdownTimeMs || 0) + 1E3 * this.detlaSincePausedSecs,
  2761.                       this.detlaSincePausedSecs = 0),
  2762.                     this.boundUpdateTimeout37_(a),
  2763.                     this.lastCountdownTimeMs = window.performance.now())
  2764.                 };
  2765.  
  2766.                 console.log('RAF_HACK_TICKERS', tag, "OK")
  2767.               } else if (tag === 'yt-live-chat-ticker-renderer') {
  2768.  
  2769.                 // no timer function to be set on yt-live-chat-ticker-renderer
  2770.  
  2771.               } else {
  2772.  
  2773.                 console.log('RAF_HACK_TICKERS', tag, "NG")
  2774.               }
  2775.  
  2776.             }
  2777.  
  2778.           }
  2779.           console.log("[End]");
  2780.           console.groupEnd();
  2781.  
  2782.  
  2783.         })
  2784.  
  2785.  
  2786.         if (ENABLE_RAF_HACK_INPUT_RENDERER && rafHub !== null) {
  2787.  
  2788.  
  2789.           customElements.whenDefined("yt-live-chat-message-input-renderer").then(() => {
  2790.  
  2791.             mightFirstCheckOnYtInit();
  2792.             groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-message-input-renderer hacks");
  2793.             console.log("[Begin]");
  2794.             (() => {
  2795.  
  2796.               const tag = "yt-live-chat-message-input-renderer"
  2797.               const dummy = document.createElement(tag);
  2798.  
  2799.               const cProto = getProto(dummy);
  2800.               if (!cProto || !cProto.attached) {
  2801.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  2802.                 return;
  2803.               }
  2804.  
  2805.               let doHack = false;
  2806.               if (typeof cProto.handleTimeout === 'function' && typeof cProto.updateTimeout === 'function') {
  2807.  
  2808.                 // not cancellable
  2809.                 console.log('handleTimeout', typeof cProto.handleTimeout)
  2810.                 console.log('updateTimeout', typeof cProto.updateTimeout)
  2811.  
  2812.                 doHack = fnIntegrity(cProto.handleTimeout, '1.27.16') && fnIntegrity(cProto.updateTimeout, '1.50.33');
  2813.  
  2814.               }
  2815.  
  2816.               if (doHack) {
  2817.  
  2818.                 cProto.handleTimeout = function (a) {
  2819.                   console.log('cProto.handleTimeout', tag)
  2820.                   if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  2821.                   this.timeoutDurationMs = this.timeoutMs = a;
  2822.                   this.countdownRatio = 1;
  2823.                   0 === this.lastTimeoutTimeMs && rafHub.request(this.boundUpdateTimeout38_)
  2824.                 };
  2825.                 cProto.updateTimeout = function (a) {
  2826.                   console.log('cProto.updateTimeout', tag)
  2827.                   if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  2828.                   this.lastTimeoutTimeMs && (this.timeoutMs = Math.max(0, this.timeoutMs - (a - this.lastTimeoutTimeMs)),
  2829.                     this.countdownRatio = this.timeoutMs / this.timeoutDurationMs);
  2830.                   this.isAttached && this.timeoutMs ? (this.lastTimeoutTimeMs = a,
  2831.                     rafHub.request(this.boundUpdateTimeout38_)) : this.lastTimeoutTimeMs = 0
  2832.                 };
  2833.  
  2834.                 console.log('RAF_HACK_INPUT_RENDERER', tag, "OK")
  2835.               } else {
  2836.  
  2837.                 console.log('RAF_HACK_INPUT_RENDERER', tag, "NG")
  2838.               }
  2839.  
  2840.             })();
  2841.  
  2842.             console.log("[End]");
  2843.  
  2844.             console.groupEnd();
  2845.  
  2846.  
  2847.           })
  2848.  
  2849.  
  2850.         }
  2851.  
  2852.         if (ENABLE_RAF_HACK_EMOJI_PICKER && rafHub !== null) {
  2853.  
  2854.  
  2855.           customElements.whenDefined("yt-emoji-picker-renderer").then(() => {
  2856.  
  2857.             mightFirstCheckOnYtInit();
  2858.             groupCollapsed("YouTube Super Fast Chat", " | yt-emoji-picker-renderer hacks");
  2859.             console.log("[Begin]");
  2860.             (() => {
  2861.  
  2862.               const tag = "yt-emoji-picker-renderer"
  2863.               const dummy = document.createElement(tag);
  2864.  
  2865.               const cProto = getProto(dummy);
  2866.               if (!cProto || !cProto.attached) {
  2867.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  2868.                 return;
  2869.               }
  2870.  
  2871.               let doHack = false;
  2872.               if (typeof cProto.animateScroll_ === 'function') {
  2873.  
  2874.                 // not cancellable
  2875.                 console.log('animateScroll_', typeof cProto.animateScroll_)
  2876.  
  2877.                 doHack = fnIntegrity(cProto.animateScroll_, '1.102.49')
  2878.  
  2879.               }
  2880.  
  2881.               if (doHack) {
  2882.  
  2883.                 const querySelector = HTMLElement.prototype.querySelector;
  2884.                 const U = (element) => ({
  2885.                   querySelector: (selector) => querySelector.call(element, selector)
  2886.                 });
  2887.  
  2888.                 cProto.animateScroll_ = function (a) {
  2889.                   // console.log('cProto.animateScroll_', tag) // yt-emoji-picker-renderer
  2890.                   if (!this.boundAnimateScroll39_) this.boundAnimateScroll39_ = this.animateScroll_.bind(this);
  2891.                   this.lastAnimationTime_ || (this.lastAnimationTime_ = a);
  2892.                   a -= this.lastAnimationTime_;
  2893.                   200 > a ? (U(this.hostElement).querySelector("#categories").scrollTop = this.animationStart_ + (this.animationEnd_ - this.animationStart_) * a / 200,
  2894.                     rafHub.request(this.boundAnimateScroll39_)) : (null != this.animationEnd_ && (U(this.hostElement).querySelector("#categories").scrollTop = this.animationEnd_),
  2895.                       this.animationEnd_ = this.animationStart_ = null,
  2896.                       this.lastAnimationTime_ = 0);
  2897.                   this.updateButtons_()
  2898.                 }
  2899.  
  2900.                 console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "OK")
  2901.               } else {
  2902.  
  2903.                 console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "NG")
  2904.               }
  2905.  
  2906.             })();
  2907.  
  2908.             console.log("[End]");
  2909.  
  2910.             console.groupEnd();
  2911.           });
  2912.         }
  2913.  
  2914.         if (ENABLE_RAF_HACK_DOCKED_MESSAGE && rafHub !== null) {
  2915.  
  2916.  
  2917.           customElements.whenDefined("yt-live-chat-docked-message").then(() => {
  2918.  
  2919.             mightFirstCheckOnYtInit();
  2920.             groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-docked-message hacks");
  2921.             console.log("[Begin]");
  2922.             (() => {
  2923.  
  2924.               const tag = "yt-live-chat-docked-message"
  2925.               const dummy = document.createElement(tag);
  2926.  
  2927.               const cProto = getProto(dummy);
  2928.               if (!cProto || !cProto.attached) {
  2929.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  2930.                 return;
  2931.               }
  2932.  
  2933.               let doHack = false;
  2934.               if (typeof cProto.detached === 'function' && typeof cProto.checkIntersections === 'function' && typeof cProto.onDockableMessagesChanged === 'function' && typeof cProto.boundCheckIntersections === 'undefined') {
  2935.  
  2936.                 // cancelable - this.intersectRAF <detached>
  2937.                 // yt-live-chat-docked-message
  2938.                 // boundCheckIntersections <-> checkIntersections
  2939.                 // onDockableMessagesChanged
  2940.                 //  this.intersectRAF = window.requestAnimationFrame(this.boundCheckIntersections);
  2941.  
  2942.                 console.log('detached', typeof cProto.detached)
  2943.                 console.log('checkIntersections', typeof cProto.checkIntersections)
  2944.                 console.log('onDockableMessagesChanged', typeof cProto.onDockableMessagesChanged)
  2945.  
  2946.                 doHack = fnIntegrity(cProto.detached, '0.32.22') && fnIntegrity(cProto.checkIntersections, '0.128.85') && fnIntegrity(cProto.onDockableMessagesChanged, '0.20.11')
  2947.  
  2948.               }
  2949.  
  2950.               if (doHack) {
  2951.  
  2952.                 cProto.checkIntersections = function () {
  2953.                   console.log('cProto.checkIntersections', tag)
  2954.                   if (this.dockableMessages.length) {
  2955.                     this.intersectRAF = rafHub.request(this.boundCheckIntersections);
  2956.                     var a = this.dockableMessages[0]
  2957.                       , b = this.hostElement.getBoundingClientRect();
  2958.                     a = a.getBoundingClientRect();
  2959.                     var c = a.top - b.top
  2960.                       , d = 8 >= c;
  2961.                     c = 8 >= c - this.hostElement.clientHeight;
  2962.                     if (d) {
  2963.                       for (var e; d;) {
  2964.                         e = this.dockableMessages.shift();
  2965.                         d = this.dockableMessages[0];
  2966.                         if (!d)
  2967.                           break;
  2968.                         d = d.getBoundingClientRect();
  2969.                         c = d.top - b.top;
  2970.                         var f = 8 >= c;
  2971.                         if (8 >= c - a.height)
  2972.                           if (f)
  2973.                             a = d;
  2974.                           else
  2975.                             return;
  2976.                         d = f
  2977.                       }
  2978.                       this.dock(e)
  2979.                     } else
  2980.                       c && this.dockedItem && this.clear()
  2981.                   } else
  2982.                     this.intersectRAF = 0
  2983.                 }
  2984.  
  2985.                 cProto.onDockableMessagesChanged = function () {
  2986.                   // console.log('cProto.onDockableMessagesChanged', tag) // yt-live-chat-docked-message
  2987.                   this.dockableMessages.length && !this.intersectRAF && (this.intersectRAF = rafHub.request(this.boundCheckIntersections))
  2988.                 }
  2989.  
  2990.                 cProto.detached = function () {
  2991.                   this.intersectRAF && rafHub.cancel(this.intersectRAF)
  2992.                 }
  2993.  
  2994.                 console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "OK")
  2995.               } else {
  2996.  
  2997.                 console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "NG")
  2998.               }
  2999.  
  3000.             })();
  3001.  
  3002.             console.log("[End]");
  3003.  
  3004.             console.groupEnd();
  3005.  
  3006.           });
  3007.  
  3008.         }
  3009.  
  3010.  
  3011.       }
  3012.  
  3013.       promiseForCustomYtElementsReady.then(onRegistryReadyForDOMOperations);
  3014.  
  3015.  
  3016.     })();
  3017.  
  3018.  
  3019.   });
  3020.  
  3021. })({ IntersectionObserver });