YouTube直播聊天的终极性能提升
当前为 
// ==UserScript==
// @name                YouTube Super Fast Chat
// @version             0.61.6
// @license             MIT
// @name:ja             YouTube スーパーファーストチャット
// @name:zh-TW          YouTube 超快聊天
// @name:zh-CN          YouTube 超快聊天
// @icon                https://github.com/cyfung1031/userscript-supports/raw/main/icons/super-fast-chat.png
// @namespace           UserScript
// @match               https://www.youtube.com/live_chat*
// @match               https://www.youtube.com/live_chat_replay*
// @author              CY Fung
// @run-at              document-start
// @grant               none
// @unwrap
// @allFrames           true
// @inject-into         page
// @require             https://update.greasyfork.org/scripts/475632/1340102/ytConfigHacks.js
//
// @compatible          firefox Violentmonkey
// @compatible          firefox Tampermonkey
// @compatible          firefox FireMonkey
// @compatible          chrome Violentmonkey
// @compatible          chrome Tampermonkey
// @compatible          opera Violentmonkey
// @compatible          opera Tampermonkey
// @compatible          safari Stay
// @compatible          edge Violentmonkey
// @compatible          edge Tampermonkey
// @compatible          brave Violentmonkey
// @compatible          brave Tampermonkey
//
// @description         Ultimate Performance Boost for YouTube Live Chats
// @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
// @description:zh-TW   YouTube直播聊天的終極性能提升
// @description:zh-CN   YouTube直播聊天的终极性能提升
//
// ==/UserScript==
((__CONTEXT__) => {
  'use strict';
  const ENABLE_REDUCED_MAXITEMS_FOR_FLUSH = true;         // TRUE to enable trimming down to MAX_ITEMS_FOR_FULL_FLUSH (25) messages when there are too many unrendered messages
  const MAX_ITEMS_FOR_TOTAL_DISPLAY = 90;                 // By default, 250 latest messages will be displayed, but displaying MAX_ITEMS_FOR_TOTAL_DISPLAY (90) messages is already sufficient.
  const MAX_ITEMS_FOR_FULL_FLUSH = 25;                    // If there are too many new (stacked) messages not yet rendered, clean all and flush MAX_ITEMS_FOR_FULL_FLUSH (25) latest messages then incrementally added back to MAX_ITEMS_FOR_TOTAL_DISPLAY (90) messages
  const ENABLE_NO_SMOOTH_TRANSFORM = true;                // Depends on whether you want the animation effect for new chat messages
  const USE_OPTIMIZED_ON_SCROLL_ITEMS = true;             // TRUE for the majority
  const USE_WILL_CHANGE_CONTROLLER = false;               // FALSE for the majority
  const ENABLE_DELAYED_CHAT_OCCURRENCE_PREFERRED = false;  // 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.
  const ENABLE_OVERFLOW_ANCHOR_PREFERRED = true;          // Enable `overflow-anchor: auto` to lock the scroll list at the bottom for no smooth transform.
  const FIX_SHOW_MORE_BUTTON_LOCATION = true;             // When there are voting options (bottom panel), move the "show more" button to the top.
  const FIX_INPUT_PANEL_OVERFLOW_ISSUE = true;            // When the super chat button is flicking with color, the scrollbar might come out.
  const FIX_INPUT_PANEL_BORDER_ISSUE = true;              // No border should be allowed if there is an empty input panel.
  const SET_CONTAIN_FOR_CHATROOM = true;                  // Rendering hacks (`contain`) for chatroom elements. [ General ]
  const FORCE_CONTENT_VISIBILITY_UNSET = true;            // Content-visibility should be always VISIBLE for high performance and great rendering.
  const FORCE_WILL_CHANGE_UNSET = true;                   // Will-change should be always UNSET (auto) for high performance and low energy impact.
  // Replace requestAnimationFrame timers with custom implementation
  const ENABLE_RAF_HACK_TICKERS = true;           // When there is a ticker
  const ENABLE_RAF_HACK_DOCKED_MESSAGE = true;    // To be confirmed
  const ENABLE_RAF_HACK_INPUT_RENDERER = true;    // To be confirmed
  const ENABLE_RAF_HACK_EMOJI_PICKER = true;      // When changing the page of the emoji picker
  // Force rendering all the character subsets of the designated font(s) before messages come (Pre-Rendering of Text)
  const ENABLE_FONT_PRE_RENDERING_PREFERRED = 1 | 2 | 4 | 8 | 16;
  // Backdrop `filter: blur(4px)` inside the iframe can extend to the whole page, causing a negative visual impact on the video you are watching.
  const NO_BACKDROP_FILTER_WHEN_MENU_SHOWN = true;
  // Data Manipulation for Participants (Participant List)
  // << if DO_PARTICIPANT_LIST_HACKS >>
  const DO_PARTICIPANT_LIST_HACKS = true;                     // TRUE for the majority
  const SHOW_PARTICIPANT_CHANGES_IN_CONSOLE = false;          // Just too annoying to show them all in popular chat
  const CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = true;  // Only consider changes in renderable content (not concerned with the last chat message of the participants)
  const PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED = true;
  // << end >>
  // show more button
  const ENABLE_SHOW_MORE_BLINKER = true;                      // BLINK WHEN NEW MESSAGES COME
  // faster stampDomArray_ for participants list creation
  const ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL = 1;            // 0 - OFF; 1 - ON; 2 - ON(PARTICIPANTS_LIST ONLY)
  const USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET = false;
  // reuse yt components
  const ENABLE_FLAGS_REUSE_COMPONENTS = true;
  // ShadyDom Free is buggy
  const DISABLE_FLAGS_SHADYDOM_FREE = true;
  // images <Group#I01>
  const AUTHOR_PHOTO_SINGLE_THUMBNAIL = 1;  // 0 - disable; 1- smallest; 2- largest
  const EMOJI_IMAGE_SINGLE_THUMBNAIL = 1;   // 0 - disable; 1- smallest; 2- largest
  const LEAST_IMAGE_SIZE = 48;              // minium size = 48px
  const DO_LINK_PREFETCH = true;                      // DO NOT CHANGE
  // << if DO_LINK_PREFETCH >>
  const ENABLE_BASE_PREFETCHING = true;               // (SUB-)DOMAIN | dns-prefetch & preconnect
  const ENABLE_PRELOAD_THUMBNAIL = true;              // subresource (prefetch) [LINK for Images]
  const PREFETCH_LIMITED_SIZE_EMOJI = 512;            // DO NOT CHANGE THIS
  const PREFETCH_LIMITED_SIZE_AUTHOR_PHOTO = 68;      // DO NOT CHANGE THIS
  // << end >>
  const FIX_SETSRC_AND_THUMBNAILCHANGE_ = true;       // Function Replacement for yt-img-shadow....
  const FIX_THUMBNAIL_DATACHANGED = true;             // Function Replacement for yt-live-chat-author-badge-renderer..dataChanged
  // const REMOVE_PRELOADAVATARFORADDACTION = false;      // Function Replacement for yt-live-chat-renderer..preloadAvatarForAddAction
  const FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION = true;     // important [depends on <Group#I01>]
  const FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT = true;  // [depends on <Group#I01>]
  const ATTEMPT_ANIMATED_TICKER_BACKGROUND = 'steps'   // false OR '' for disabled, 'linear', 'steps' for easing-function
  // << if ATTEMPT_ANIMATED_TICKER_BACKGROUND >>
  // BROWSER SUPPORT: Chrome 75+, Edge 79+, Safari 13.1+, Firefox 63+, Opera 62+
  const TICKER_MAX_STEPS_LIMIT = 500;                       //  NOT LESS THAN 5 STEPS!!
  // [limiting 500 max steps] is recommended for "confortable visual change"
  //      min. step increment 0.2% => max steps: 500 =>  800ms per each update
  //      min. step increment 0.5% => max steps: 200 => 1000ms per each update
  //      min. step increment 1.0% => max steps: 100 => 1000ms per each update
  //      min. step increment 2.5% => max steps:  40 => 1000ms per each update
  //      min. step increment 5.0% => max steps:  20 => 1250ms per each update
  const ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX = true;    // for video playback's ticker issue. [ Playback Replay - Pause at Middle - Backwards Seeking ]
  // << end >>
  const FIX_TOOLTIP_DISPLAY = true;
  const USE_VANILLA_DEREF = true;
  const FIX_DROPDOWN_DERAF = true;                        // DONT CHANGE
  const CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN = true;                // cache the menu data and used for the next reopen
  const ADVANCED_NOT_ALLOW_SCROLL_FOR_SHOW_CONTEXT_MENU = true;   // pause auto scroll faster when the context menu is about to show
  const ENABLE_MUTEX_FOR_SHOW_CONTEXT_MENU = true;                // avoid multiple requests on the same time
  const BOOST_MENU_OPENCHANGED_RENDERING = true;
  const FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK = true;  // click again = close
  const NO_ITEM_TAP_FOR_NON_STATIONARY_TAP = true;                // dont open the menu (e.g. text message) if cursor is moved or long press
  const TAP_ACTION_DURATION = 280;                                // exceeding 280ms would not consider as a tap action
  const PREREQUEST_CONTEXT_MENU_ON_MOUSE_DOWN = true;             // require CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN = true
  // const FIX_MENU_CAPTURE_SCROLL = true;
  const CHAT_MENU_REFIT_ALONG_SCROLLING = 0;                      // 0 for locking / default; 1 for unlocking only; 2 for unlocking and refit
  const RAF_FIX_keepScrollClamped = true;
  const RAF_FIX_scrollIncrementally = 2;                          // 0: no action; 1: basic fix; 2: also fix scroll position
  // << if BOOST_MENU_OPENCHANGED_RENDERING >>
  const FIX_MENU_POSITION_N_SIZING_ON_SHOWN = 1;       // correct size and position when the menu dropdown opens
  const CHECK_JSONPRUNE = true;                        // This is a bug in Brave
  // << end >>
  // const LIVE_CHAT_FLUSH_ON_FOREGROUND_ONLY = false;
  const CHANGE_DATA_FLUSH_ASYNC = false;
  // CHANGE_DATA_FLUSH_ASYNC is disabled due to bug report: https://greasyfork.org/scripts/469878-youtube-super-fast-chat/discussions/199479
  // to be further investigated
  const CHANGE_MANAGER_UNSUBSCRIBE = true;
  const INTERACTIVITY_BACKGROUND_ANIMATION = 1;         // mostly for pinned message
  // 0 = default Yt animation background [= no fix];
  // 1 = disable default animation background [= keep special animation];
  // 2 = disable all animation backgrounds [= no animation backbround]
  const CLOSE_TICKER_PINNED_MESSAGE_WHEN_HEADER_CLICKED = true;
  const MAX_TOOLTIP_NO_WRAP_WIDTH = '72vw'; // '' for disable; accept values like '60px', '25vw'
  const AMEND_TICKER_handleLiveChatAction = true; // to fix ticker duplication and unresponsively fast ticker generation
  const ATTEMPT_TICKER_ANIMATION_START_TIME_DETECTION = true;
  const ADJUST_TICKER_DURATION_ALIGN_RENDER_TIME = true;
  const FIX_BATCH_TICKER_ORDER = true;
  const DISABLE_Translation_By_Google = true;
  const FASTER_ICON_RENDERING = true;
  const DELAY_FOCUSEDCHANGED = true;
  const skipErrorForhandleAddChatItemAction_ = true; // currently depends on ENABLE_NO_SMOOTH_TRANSFORM
  const fixChildrenIssue801 = true; // if __children801__ is set [fix polymer controller method extration for `.set()`]
  const SUPPRESS_refreshOffsetContainerHeight_ = true; // added in FEB 2024; true for default layout options
  const NO_FILTER_DROPDOWN_BORDER = true; // added in 2024.03.02
  const FIX_ANIMATION_TICKER_TEXT_POSITION = true; // CSS fix; experimential; added in 2024.04.07
  // ========= EXPLANTION FOR 0.2% @ step timing [min. 0.2%] ===========
  /*
    ### Time Approach
    // all below values can make the time interval > 250ms
    // 250ms (practical value) refers to the minimum frequency for timeupdate in most browsers (typically, shorter timeupdate interval in modern browsers)
    if (totalDuration > 400000) stepInterval = 0.2;  // 400000ms with 0.2% increment => 800ms
    else if (totalDuration > 200000) stepInterval = 0.5; // 200000ms with 0.5% increment => 1000ms
    else if (totalDuration > 100000) stepInterval = 1; // 100000ms with 1% increment => 1000ms
    else if (totalDuration > 50000) stepInterval = 2; // 50000ms with 2% increment => 1000ms
    else if (totalDuration > 25000) stepInterval = 5; // 25000ms with 5% increment => 1250ms
    ### Pixel Check
    // Target Max Pixel Increment < 5px for Short Period Ticker (Rapid Background Change)
    // Assume total width <= 99px for short period ticker, like small donation & member welcome
    99px * 5% = 4.95px < 5px [Condition Fulfilled]
    ### Example - totalDuration = 280000
    totalDuration 280000
    stepInterval 0.5
    numOfSteps = Math.round(100 / stepInterval) = 200
    time interval = 280000 / 200 = 1400ms <acceptable>
    ### Example - totalDuration = 18000
    totalDuration 18000
    stepInterval 5
    numOfSteps = Math.round(100 / stepInterval) = 20
    time interval = 18000 / 20 = 900ms <acceptable>
    ### Example - totalDuration = 5000
    totalDuration 5000
    stepInterval 5
    numOfSteps = Math.round(100 / stepInterval) = 20
    time interval = 5000 / 20 = 250ms <threshold value>
    ### Example - totalDuration = 3600
    totalDuration 3600
    stepInterval 5
    numOfSteps = Math.round(100 / stepInterval) = 20
    time interval = 3600 / 20 = 180ms <reasonable for 3600ms ticker>
  */
  // =======================================================================================================
  // AUTOMAICALLY DETERMINED
  const ENABLE_FLAGS_MAINTAIN_STABLE_LIST = ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL === 1;
  const ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST = ENABLE_FLAGS_MAINTAIN_STABLE_LIST_VAL >= 1;
  const CHAT_MENU_SCROLL_UNLOCKING = CHAT_MENU_REFIT_ALONG_SCROLLING >= 1;
  let runTickerClassName = 'run-ticker';
  const dummyImgURL = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
  /*
    WebP: data:image/webp;base64,UklGRjAB
    PNG: data:image/png;base64,iVBORw0KGg==
    JPEG: data:image/jpeg;base64,/9j/4AA=
    GIF: data:image/gif;base64,R0lGODlhAQABAIA=
    BMP: data:image/bmp;base64,Qk1oAAAA
    SVG: data:image/svg+xml;base64,PHN2Zy8+Cg==
    WebP: data:image/webp;base64,AAAAAAA=
    PNG:  data:image/png;base64,AAAAAAA=
    JPEG: data:image/jpeg;base64,AAAAAAA=
    GIF:  data:image/gif;base64,AAAAAAA=
    BMP:  data:image/bmp;base64,AAAAAAA=
    data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
  */
  // image sizing code
  // (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null)
  //   function KC(a, b, c, d) {
  //     d = void 0 === d ? "width" : d;
  //     if (!a || !a.length)
  //         return null;
  //     if (z("kevlar_tuner_should_always_use_device_pixel_ratio")) {
  //         var e = window.devicePixelRatio;
  //         z("kevlar_tuner_should_clamp_device_pixel_ratio") ? e = Math.min(e, zl("kevlar_tuner_clamp_device_pixel_ratio")) : z("kevlar_tuner_should_use_thumbnail_factor") && (e = zl("kevlar_tuner_thumbnail_factor"));
  //         HC = e
  //     } else
  //         HC || (HC = window.devicePixelRatio);
  //     e = HC;
  //     z("kevlar_tuner_should_always_use_device_pixel_ratio") ? b *= e : 1 < e && (b *= e);
  //     if (z("kevlar_tuner_min_thumbnail_quality"))
  //         return a[0].url || null;
  //     e = a.length;
  //     if (z("kevlar_tuner_max_thumbnail_quality"))
  //         return a[e - 1].url || null;
  //     if (c)
  //         for (var h = 0; h < e; h++)
  //             if (0 <= a[h].url.indexOf(c))
  //                 return a[h].url || null;
  //     for (c = 0; c < e; c++)
  //         if (a[c][d] >= b)
  //             return a[c].url || null;
  //     for (b = e - 1; 0 < b; b--)
  //         if (a[b][d])
  //             return a[b].url || null;
  //     return a[0].url || null
  // }
  const { IntersectionObserver } = __CONTEXT__;
  /** @type {globalThis.PromiseConstructor} */
  const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  // let jsonParseFix = null;
  if (!IntersectionObserver) return console.warn("Your browser does not support IntersectionObserver.\nPlease upgrade to the latest version.");
  if (typeof WebAssembly !== 'object') return console.warn("Your browser is too old.\nPlease upgrade to the latest version."); // for passive and once
  // necessity of cssText3_smooth_transform_position to be checked.
  const cssText3_smooth_transform_position = ENABLE_NO_SMOOTH_TRANSFORM ? `
    #item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer {
        position: static !important;
    }
  `: '';
  // fallback if dummy style fn fails
  const cssText4_smooth_transform_forced_props = ENABLE_NO_SMOOTH_TRANSFORM ? `
    /* optional */
    #item-offset.style-scope.yt-live-chat-item-list-renderer {
        height: auto !important;
        min-height: unset !important;
    }
    #items.style-scope.yt-live-chat-item-list-renderer {
        transform: translateY(0px) !important;
    }
    /* optional */
  `: '';
  const cssText5 = SET_CONTAIN_FOR_CHATROOM ? `
    /* ------------------------------------------------------------------------------------------------------------- */
    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 {
        contain: layout style;
    }
    #items.style-scope.yt-live-chat-item-list-renderer {
        contain: layout paint style;
    }
    #item-offset.style-scope.yt-live-chat-item-list-renderer {
        contain: style;
    }
    #item-scroller.style-scope.yt-live-chat-item-list-renderer {
        contain: size style;
    }
    #contents.style-scope.yt-live-chat-item-list-renderer, #chat.style-scope.yt-live-chat-renderer, img.style-scope.yt-img-shadow[width][height] {
        contain: size layout paint style;
    }
    .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label], .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label] > #container {
        contain: layout paint style;
    }
    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 {
        contain: layout style;
    }
    tp-yt-paper-tooltip[style*="inset"][role="tooltip"] {
        contain: layout paint style;
    }
    /* ------------------------------------------------------------------------------------------------------------- */
  ` : '';
  const cssText6b_show_more_button = FIX_SHOW_MORE_BUTTON_LOCATION ? `
    yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer{
        top: 4px;
        transition-property: top;
        bottom: unset;
    }
    yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer[disabled]{
        top: -42px;
    }
  `: '';
  const cssText6c_input_panel_overflow = FIX_INPUT_PANEL_OVERFLOW_ISSUE ? `
    #input-panel #picker-buttons yt-live-chat-icon-toggle-button-renderer#product-picker {
        contain: layout style;
    }
    #chat.yt-live-chat-renderer ~ #panel-pages.yt-live-chat-renderer {
        overflow: visible;
    }
  `: '';
  const cssText6d_input_panel_border = FIX_INPUT_PANEL_BORDER_ISSUE ? `
    html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer:not(:empty) {
        --yt-live-chat-action-panel-top-border: none;
    }
    html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer.iron-selected > *:first-child {
        border-top: 1px solid var(--yt-live-chat-panel-pages-border-color);
    }
    html #panel-pages.yt-live-chat-renderer {
        border-top: 0;
        border-bottom: 0;
    }
  `: '';
  const cssText7b_content_visibility_unset = FORCE_CONTENT_VISIBILITY_UNSET ? `
    img,
    yt-img-shadow[height][width],
    yt-img-shadow {
        content-visibility: visible !important;
    }
  `  : '';
  const cssText7c_will_change_unset = FORCE_WILL_CHANGE_UNSET ? `
    /* remove YouTube constant will-change */
    /* constant value will slow down the performance; default auto */
    /* www-player.css */
    html .ytp-contextmenu,
    html .ytp-settings-menu {
        will-change: unset;
    }
    /* frequently matched elements */
    html .fill.yt-interaction,
    html .stroke.yt-interaction,
    html .yt-spec-touch-feedback-shape__fill,
    html .yt-spec-touch-feedback-shape__stroke {
        will-change: unset;
    }
    /* live_chat_polymer.js */
    /*
    html .toggle-button.tp-yt-paper-toggle-button,
    html #primaryProgress.tp-yt-paper-progress,
    html #secondaryProgress.tp-yt-paper-progress,
    html #onRadio.tp-yt-paper-radio-button,
    html .fill.yt-interaction,
    html .stroke.yt-interaction,
    html .yt-spec-touch-feedback-shape__fill,
    html .yt-spec-touch-feedback-shape__stroke {
        will-change: unset;
    }
    */
    /* desktop_polymer_enable_wil_icons.js */
    /* html .fill.yt-interaction,
    html .stroke.yt-interaction, */
    html tp-yt-app-header::before,
    html tp-yt-iron-list,
    html #items.tp-yt-iron-list > *,
    html #onRadio.tp-yt-paper-radio-button,
    html .toggle-button.tp-yt-paper-toggle-button,
    html ytd-thumbnail-overlay-toggle-button-renderer[use-expandable-tooltip] #label.ytd-thumbnail-overlay-toggle-button-renderer,
    html #items.ytd-post-multi-image-renderer,
    html #items.ytd-horizontal-card-list-renderer,
    html #items.yt-horizontal-list-renderer,
    html #left-arrow.yt-horizontal-list-renderer,
    html #right-arrow.yt-horizontal-list-renderer,
    html #items.ytd-video-description-infocards-section-renderer,
    html #items.ytd-video-description-music-section-renderer,
    html #chips.ytd-feed-filter-chip-bar-renderer,
    html #chips.yt-chip-cloud-renderer,
    html #items.ytd-merch-shelf-renderer,
    html #items.ytd-product-details-image-carousel-renderer,
    html ytd-video-preview,
    html #player-container.ytd-video-preview,
    html #primaryProgress.tp-yt-paper-progress,
    html #secondaryProgress.tp-yt-paper-progress,
    html ytd-miniplayer[enabled] /* ,
    html .yt-spec-touch-feedback-shape__fill,
    html .yt-spec-touch-feedback-shape__stroke */ {
        will-change: unset;
    }
    /* other */
    .ytp-videowall-still-info-content[class],
    .ytp-suggestion-image[class] {
        will-change: unset !important;
    }
  ` : '';
  const ENABLE_FONT_PRE_RENDERING = typeof HTMLElement.prototype.append === 'function' ? (ENABLE_FONT_PRE_RENDERING_PREFERRED || 0) : 0;
  const cssText8_fonts_pre_render = ENABLE_FONT_PRE_RENDERING ? `
    elzm-fonts {
        visibility: collapse;
        position: fixed;
        top: -10px;
        left: -10px;
        font-size: 10pt;
        line-height: 100%;
        width: 100px;
        height: 100px;
        transform: scale(0.1);
        transform: scale(0.01);
        transform: scale(0.001);
        transform-origin: 0 0;
        contain: strict;
        display: block;
        pointer-events: none !important;
        user-select: none !important;
    }
    elzm-fonts[id]#elzm-fonts-yk75g {
        user-select: none !important;
        pointer-events: none !important;
    }
    elzm-font {
        visibility: collapse;
        position: absolute;
        line-height: 100%;
        width: 100px;
        height: 100px;
        contain: strict;
        display: block;
        user-select: none !important;
        pointer-events: none !important;
    }
    elzm-font::before {
        visibility: collapse;
        position: absolute;
        line-height: 100%;
        width: 100px;
        height: 100px;
        contain: strict;
        display: block;
        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';
        user-select: none !important;
        pointer-events: none !important;
    }
  `: '';
  const cssText9_no_backdrop_filter_when_menu_shown = NO_BACKDROP_FILTER_WHEN_MENU_SHOWN ? `
    tp-yt-iron-dropdown.yt-live-chat-app ytd-menu-popup-renderer  {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }
  `: '';
  const cssText10_show_more_blinker = ENABLE_SHOW_MORE_BLINKER ? `
    @keyframes blinker-miuzp {
        0%, 60%, 100% {
            opacity: 1;
        }
        30% {
            opacity: 0.6;
        }
    }
    yt-icon-button#show-more.has-new-messages-miuzp {
        animation: blinker-miuzp 1.74s linear infinite;
    }
  `: '';
  const cssText11_entire_message_clickable = FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK ? `
    yt-live-chat-paid-message-renderer.yt-live-chat-item-list-renderer[whole-message-clickable] #menu.style-scope[class] {
      pointer-events: none !important;
    }
    yt-live-chat-membership-item-renderer.yt-live-chat-item-list-renderer[whole-message-clickable] #menu.style-scope[class] {
      pointer-events: none !important;
    }
    yt-live-chat-paid-sticker-renderer.yt-live-chat-item-list-renderer[whole-message-clickable] #menu.style-scope[class] {
      pointer-events: none !important;
    }
    yt-live-chat-text-message-renderer.yt-live-chat-item-list-renderer[whole-message-clickable] #menu.style-scope[class] {
      pointer-events: none !important; /* TO_BE_REVIEWED */
    }
    yt-live-chat-auto-mod-message-renderer.yt-live-chat-item-list-renderer[whole-message-clickable] #menu.style-scope[class] {
      pointer-events: none !important;
    }
  `: '';
  const cssText12_nowrap_tooltip = MAX_TOOLTIP_NO_WRAP_WIDTH && typeof MAX_TOOLTIP_NO_WRAP_WIDTH === 'string' ? `
    tp-yt-paper-tooltip[role="tooltip"] {
      box-sizing: content-box !important;
      margin: 0px !important;
      padding: 0px !important;
      contain: none !important;
    }
    tp-yt-paper-tooltip[role="tooltip"] #tooltip[style-target="tooltip"] {
      box-sizing: content-box !important;
      display: inline-block;
      contain: none !important;
    }
    tp-yt-paper-tooltip[role="tooltip"] #tooltip[style-target="tooltip"]{
      max-width: ${MAX_TOOLTIP_NO_WRAP_WIDTH};
      width: max-content;
      text-overflow: ellipsis;
      overflow: hidden;
      white-space: nowrap;
    }
  `: '';
  const cssText13_no_text_select_when_menu_visible = `
    [menu-visible] {
      --sfc47-text-select: none;
    }
    [menu-visible] #header[id][class],
    [menu-visible] #content[id][class],
    [menu-visible] #header[id][class] *,
    [menu-visible] #content[id][class] * {
      user-select: var(--sfc47-text-select) !important;
    }
    [menu-visible] #menu {
      --sfc47-text-select: inherit;
    }
  `;
  const cssText14_NO_FILTER_DROPDOWN_BORDER = NO_FILTER_DROPDOWN_BORDER ? `
  yt-live-chat-header-renderer.yt-live-chat-renderer #label.yt-dropdown-menu::before {
    border:0;
  }
  ` : '';
  const cssText15_FIX_ANIMATION_TICKER_TEXT_POSITION = FIX_ANIMATION_TICKER_TEXT_POSITION ? `
  
    .style-scope.yt-live-chat-ticker-renderer #animation-container[id][class] {
      position: relative;
      display: grid;
      grid-auto-columns: 1fr;
      grid-auto-rows: 1fr;
      grid-template-columns: repeat(1, 1fr);
      gap: 9px;
      padding-bottom: 0;
      margin-bottom: 0;
      padding-top: 0;
      margin-top: 0;
      margin-top: -2px;
    }
    .style-scope.yt-live-chat-ticker-renderer #animation-container > [id][class] {
      margin-top: 0px;
      margin-bottom: 0px;
      flex-direction: column;
      justify-content: center;
    }
    .style-scope.yt-live-chat-ticker-renderer #animation-container > [id][class]:first-child {
      display: flex;
    }
  ` : '';
  const addCss = () => `
    @property --ticker-rtime {
      syntax: "<percentage>";
      inherits: false;
      initial-value: 0%;
    }
    /*
    .run-ticker {
      background:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2));
    }
    .run-ticker-test {
      background: #00000001;
    }
    .run-ticker-forced,
    yt-live-chat-ticker-renderer #items > * > #container.run-ticker-forced,
    yt-live-chat-ticker-renderer[class] #items[class] > *[class] > #container.run-ticker-forced[class]
    {
      background:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2)) !important;
    }
    */
    .run-ticker {
      --ticker-bg:linear-gradient(90deg, var(--ticker-c1),var(--ticker-c1) var(--ticker-rtime),var(--ticker-c2) var(--ticker-rtime),var(--ticker-c2));
    }
    .run-ticker,
    yt-live-chat-ticker-renderer #items > * > #container.run-ticker,
    yt-live-chat-ticker-renderer[class] #items[class] > *[class] > #container.run-ticker[class]
    {
      background: var(--ticker-bg) !important;
    }
    yt-live-chat-ticker-dummy777-item-renderer {
      background: #00000001;
    }
    yt-live-chat-ticker-dummy777-item-renderer[dummy777] {
      position: fixed !important;
      top: -1000px !important;
      left: -1000px !important;
      font-size: 1px !important;
      color: transparent !important;
      pointer-events: none !important;
      z-index: -1 !important;
      contain: strict !important;
      box-sizing: border-box !important;
      pointer-events: none !important;
      user-select: none !important;
      max-width: 1px !important;
      max-height: 1px !important;
      overflow: hidden !important;
      visibility: collapse !important;
      display: none !important;
    }
    yt-live-chat-ticker-dummy777-item-renderer #container {
      background: inherit;
    }
    ${cssText8_fonts_pre_render}
    ${cssText9_no_backdrop_filter_when_menu_shown}
    @supports (contain: layout paint style) {
      ${cssText5}
    }
    @supports (color: var(--general)) {
      html {
          --yt-live-chat-item-list-renderer-padding: 0px 0px;
      }
      ${cssText3_smooth_transform_position}
      ${cssText7c_will_change_unset}
      ${cssText7b_content_visibility_unset}
      yt-live-chat-item-list-renderer:not([allow-scroll]) #item-scroller.yt-live-chat-item-list-renderer {
          overflow-y: scroll;
          padding-right: 0;
      }
      ${cssText4_smooth_transform_forced_props}
      yt-icon[icon="down_arrow"] > *, yt-icon-button#show-more > * {
          pointer-events: none !important;
      }
      #continuations, #continuations * {
          contain: strict;
          position: fixed;
          top: 2px;
          height: 1px;
          width: 2px;
          height: 1px;
          visibility: collapse;
      }
      ${cssText6b_show_more_button}
      ${cssText6d_input_panel_border}
      ${cssText6c_input_panel_overflow}
    }
    @supports (overflow-anchor: auto) {
      .no-anchor * {
          overflow-anchor: none;
      }
      .no-anchor > item-anchor {
          overflow-anchor: auto;
      }
      item-anchor {
          height:1px;
          width: 100%;
          transform: scaleY(0.00001);
          transform-origin:0 0;
          contain: strict;
          opacity:0;
          display:flex;
          position:relative;
          flex-shrink:0;
          flex-grow:0;
          margin-bottom:0;
          overflow:hidden;
          box-sizing:border-box;
          visibility: visible;
          content-visibility: visible;
          contain-intrinsic-size: auto 1px;
          pointer-events:none !important;
      }
      #item-scroller.style-scope.yt-live-chat-item-list-renderer[class] {
          overflow-anchor: initial !important; /* whenever ENABLE_OVERFLOW_ANCHOR or not */
      }
      html item-anchor {
          height: 1px;
          width: 1px;
          top: auto;
          left: auto;
          right: auto;
          bottom: auto;
          transform: translateY(-1px);
          position: absolute;
          z-index: -1;
      }
    }
    @supports (color: var(--pre-rendering)) {
      @keyframes dontRenderAnimation {
          0% {
              background-position-x: 3px;
          }
          100% {
              background-position-x: 4px;
          }
      }
      .dont-render[class] {
          /* visibility: collapse !important; */
          /* visibility: collapse will make innerText become "" which conflicts with BetterStreamChat; see https://greasyfork.org/scripts/469878/discussions/197267 */
          transform: scale(0.01) !important;
          transform: scale(0.00001) !important;
          transform: scale(0.0000001) !important;
          transform-origin: 0 0 !important;
          z-index: -1 !important;
          contain: strict !important;
          box-sizing: border-box !important;
          height: 1px !important;
          height: 0.1px !important;
          height: 0.01px !important;
          height: 0.0001px !important;
          height: 0.000001px !important;
          animation: dontRenderAnimation 1ms linear 80ms 1 normal forwards !important;
          pointer-events: none !important;
          user-select: none !important;
      }
      #sk35z {
        display: block !important;
        visibility: collapse !important;
        transform: scale(0.01) !important;
        transform: scale(0.00001) !important;
        transform: scale(0.0000001) !important;
        transform-origin: 0 0 !important;
        z-index: -1 !important;
        contain: strict !important;
        box-sizing: border-box !important;
        height: 1px !important;
        height: 0.1px !important;
        height: 0.01px !important;
        height: 0.0001px !important;
        height: 0.000001px !important;
        position: absolute !important;
        top: -1000px !important;
        left: -1000px !important;
      }
    }
    [rNgzQ] {
      opacity: 0 !important;
      pointer-events: none !important;
    }
    ${cssText10_show_more_blinker}
    ${cssText11_entire_message_clickable}
    ${cssText12_nowrap_tooltip}
    ${cssText13_no_text_select_when_menu_visible}
    ${cssText14_NO_FILTER_DROPDOWN_BORDER}
    ${cssText15_FIX_ANIMATION_TICKER_TEXT_POSITION}
  `;
  const konsole = {
    nil: Symbol(),
    logs: [],
    style: '',
    log(...args) {
      konsole.logs.push({
        type: 'log',
        msg: [konsole.tag || konsole.nil, ...args, konsole.style || konsole.nil].filter(e => e !== konsole.nil)
      });
    },
    setTag(tag) {
      konsole.tag = tag;
    },
    setStyle(style) {
      konsole.style = style;
    },
    groupCollapsed(...args) {
      konsole.logs.push({
        type: 'groupCollapsed',
        msg: [...args].filter(e => e !== konsole.nil)
      });
    },
    groupEnd() {
      konsole.logs.push({
        type: 'groupEnd'
      })
    },
    print() {
      const copy = konsole.logs.slice(0);
      konsole.logs.length = 0;
      for (const { type, msg } of copy) {
        if (type === 'log') {
          console.log(...msg)
        } else if (type === 'groupCollapsed') {
          console.groupCollapsed(...msg)
        } else if (type === 'groupEnd') {
          console.groupEnd();
        }
      }
    }
  };
  /*
  konsole.groupCollapsedX = (text1, text2) => {
    if(!text2){
      konsole.groupCollapsed(`%c${text1}`,
      "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;"
    );
    }else{
      konsole.groupCollapsed(`%c${text1}%c${text2}`,
      "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;",
      "background-color: #010502; color: #6ad9fe; font-weight: 300; padding: 2px;"
    );
    }
  }
  konsole.groupCollapsedX('YouTube Super Fast Chat');
  setTimeout(()=>{
    konsole.setTag('[[Fonts Pre-Rendering]]');
    konsole.log(123);
    konsole.log('wsd',332, 'ssa');
    konsole.setTag('');
  }, 100);
  setTimeout(()=>{
    konsole.setTag('[[Fonts Pre-Rendering 2]]');
    konsole.log(123);
    konsole.log('wsd',332, 'ssa');
    konsole.setTag('');
  }, 300);
  setTimeout(()=>{
  konsole.groupEnd();
  konsole.print();
  }, 1000);
  */
  const win = typeof unsafeWindow !== 'undefined' ? unsafeWindow : (this instanceof Window ? this : window);
  // Create a unique key for the script and check if it is already running
  const hkey_script = 'mchbwnoasqph';
  if (win[hkey_script]) throw new Error('Duplicated Userscript Calling'); // avoid duplicated scripting
  win[hkey_script] = true;
  if (!!ATTEMPT_ANIMATED_TICKER_BACKGROUND) {
    let te4 = setTimeout(() => { }); // dummy; skip timerId only;
    if (te4 < 3) {
      setTimeout(() => { });
      setTimeout(() => { });
    }
  }
  const firstKey = (obj) => {
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) return key;
    }
    return null;
  }
  const firstObjectKey = (obj) => {
    for (const key in obj) {
      if (obj.hasOwnProperty(key) && typeof obj[key] === 'object') return key;
    }
    return null;
  }
  
    /**
   * Takes in a __SORTED__ array and inserts the provided value into
   * the correct, sorted, position.
   * > https://github.com/bhowell2/binary-insert-js/
   * @param array the sorted array where the provided value needs to be inserted (in order)
   * @param insertValue value to be added to the array
   * @param comparator function that helps determine where to insert the value (
   */
  function binaryInsert(array, insertValue, comparator) {
    let left = 0;
    let right = array.length;
    let z;
    // Directly return if array is empty or the insertValue should be at the end
    if (right === 0 || (z = comparator(array[right - 1], insertValue)) <= 0) {
      array.push(insertValue);
      return array;
    }
    // Check if the insertValue should be at the beginning
    if ((right === 1 ? z : comparator(array[0], insertValue)) >= 0) {
      array.unshift(insertValue);
      return array;
    }
    ++left; --right;
    // Main binary search loop to find the insertion position
    while (left < right) {
      const mid = Math.floor((right + left) / 2);
      const compared = comparator(array[mid], insertValue);
      if (compared < 0) {
        left = mid + 1;
      } else if (compared > 0) {
        right = mid;
      } else {
        // If equal, insert at the mid position
        left = right = mid;
        break;
      }
    }
    // Insertion is always at the right position due to the nature of the binary search
    array.splice(right, 0, insertValue);
    return array;
  }
    
    
    
  class LimitedSizeSet extends Set {
    constructor(n) {
      super();
      this.limit = n;
    }
    add(key) {
      if (!super.has(key)) {
        super.add(key); // Set the key with a dummy value (true)
        while (super.size > this.limit) {
          const firstKey = super.values().next().value; // Get the first (oldest) key
          super.delete(firstKey); // Delete the oldest key
        }
      }
    }
    removeAdd(key) {
      super.delete(key);
      super.add(key);
    }
  }
  // function removeElementFromArray(arr, index) {
  //   if (index >= 0 && index < arr.length) {
  //     arr.splice(index, 1);
  //   }
  // }
  // function getRandomInt(a, b) {
  //   // Ensure that 'a' and 'b' are integers
  //   a = Math.ceil(a);
  //   b = Math.floor(b);
  //   // Generate a random integer in the range [a, b]
  //   return Math.floor(Math.random() * (b - a + 1)) + a;
  // }
  function deepCopy(obj, skipKeys) {
    skipKeys = skipKeys || [];
    if (!obj || typeof obj !== 'object') return obj;
    if (Array.isArray(obj)) {
      return obj.map(item => deepCopy(item, skipKeys));
    }
    const copy = {};
    for (let key in obj) {
      if (!skipKeys.includes(key)) {
        copy[key] = deepCopy(obj[key], skipKeys);
      }
    }
    return copy;
  }
  class Mutex {
    constructor() {
      this.p = Promise.resolve()
    }
    /**
     *  @param {(lockResolve: () => void)} f
     */
    lockWith(f) {
      this.p = this.p.then(() => new Promise(f).catch(console.warn))
    }
  }
  const PromiseExternal = ((resolve_, reject_) => {
    const h = (resolve, reject) => { resolve_ = resolve; reject_ = reject };
    return class PromiseExternal extends Promise {
      constructor(cb = h) {
        super(cb);
        if (cb === h) {
          /** @type {(value: any) => void} */
          this.resolve = resolve_;
          /** @type {(reason?: any) => void} */
          this.reject = reject_;
        }
      }
    };
  })();
  /** @type {typeof PromiseExternal.prototype | null} */
  let relayPromise = null;
  /** @type {typeof PromiseExternal.prototype | null} */
  let onPlayStateChangePromise = null;
  let playEventsStack = Promise.resolve();
  let playerProgressChangedArg1 = null;
  let playerProgressChangedArg2 = null;
  let playerProgressChangedArg3 = null;
  function dr(s) {
    // reserved for future use
    return s;
    // return window.deWeakJS ? window.deWeakJS(s) : s;
  }
  const insp = o => o ? (o.polymerController || o.inst || o || 0) : (o || 0);
  const indr = o => insp(o).$ || o.$ || 0;
  const getProto = (element) => {
    if (element) {
      const cnt = insp(element);
      return cnt.constructor.prototype || null;
    }
    return null;
  }
  const assertor = (f) => f() || console.assert(false, f + "");
  const fnIntegrity = (f, d) => {
    if (!f || typeof f !== 'function') {
      console.warn('f is not a function', f);
      return;
    }
    let p = f + "", s = 0, j = -1, w = 0;
    for (let i = 0, l = p.length; i < l; i++) {
      const t = p[i];
      if (((t >= 'a' && t <= 'z') || (t >= 'A' && t <= 'Z'))) {
        if (j < i - 1) w++;
        j = i;
      } else {
        s++;
      }
    }
    let itz = `${f.length}.${s}.${w}`;
    if (!d) {
      return itz;
    } else if (itz !== d) {
      console.warn('fnIntegrity=false', itz);
      return false;
    } else {
      return true;
    }
  }
  const px2cm = (px) => px * window.devicePixelRatio * 0.026458333;
  const px2mm = (px) => px * window.devicePixelRatio * 0.26458333;
  ; (ENABLE_FLAGS_MAINTAIN_STABLE_LIST || ENABLE_FLAGS_REUSE_COMPONENTS || DISABLE_FLAGS_SHADYDOM_FREE) && (() => {
    const _config_ = () => {
      try {
        return ytcfg.data_;
      } catch (e) { }
      return null;
    };
    const flagsFn = (EXPERIMENT_FLAGS) => {
      // console.log(700)
      if (!EXPERIMENT_FLAGS) return;
      if (ENABLE_FLAGS_MAINTAIN_STABLE_LIST) {
        if (USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET ? EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list === true : true) {
          // EXPERIMENT_FLAGS.kevlar_tuner_should_test_maintain_stable_list = true; // timestamp toggle issue
          EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list = true;
          // console.log(701)
        }
      }
      if (ENABLE_FLAGS_REUSE_COMPONENTS) {
        EXPERIMENT_FLAGS.kevlar_tuner_should_test_reuse_components = true;
        EXPERIMENT_FLAGS.kevlar_tuner_should_reuse_components = true;
        // console.log(702);
      }
      if (DISABLE_FLAGS_SHADYDOM_FREE) {
        EXPERIMENT_FLAGS.enable_shadydom_free_scoped_node_methods = false;
        EXPERIMENT_FLAGS.enable_shadydom_free_scoped_query_methods = false;
        EXPERIMENT_FLAGS.enable_shadydom_free_scoped_readonly_properties_batch_one = false;
        EXPERIMENT_FLAGS.enable_shadydom_free_parent_node = false;
        EXPERIMENT_FLAGS.enable_shadydom_free_children = false;
        EXPERIMENT_FLAGS.enable_shadydom_free_last_child = false;
      }
    };
    const uf = (config_) => {
      config_ = config_ || _config_();
      if (config_) {
        const { EXPERIMENT_FLAGS, EXPERIMENTS_FORCED_FLAGS } = config_;
        if (EXPERIMENT_FLAGS) {
          flagsFn(EXPERIMENT_FLAGS);
          if (EXPERIMENTS_FORCED_FLAGS) flagsFn(EXPERIMENTS_FORCED_FLAGS);
        }
      }
    }
    window._ytConfigHacks.add((config_) => {
      uf(config_);
    });
    uf();
  })();
  if (DISABLE_Translation_By_Google) {
    let mo = new MutationObserver(() => {
      if (!mo) return;
      let h = document.head;
      if (!h) return;
      mo.disconnect();
      mo.takeRecords();
      mo = null;
      let meta = document.createElement('meta');
      meta.setAttribute('name', 'google');
      meta.setAttribute('content', 'notranslate');
      h.appendChild(meta);
    });
    mo.observe(document, { subtree: true, childList: true });
  }
  console.assert(MAX_ITEMS_FOR_TOTAL_DISPLAY > 0 && MAX_ITEMS_FOR_FULL_FLUSH > 0 && MAX_ITEMS_FOR_TOTAL_DISPLAY > MAX_ITEMS_FOR_FULL_FLUSH)
  let ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE = false;
  const isContainSupport = CSS.supports('contain', 'layout paint style');
  if (!isContainSupport) {
    console.warn("Your browser does not support css property 'contain'.\nPlease upgrade to the latest version.".trim());
  } else {
    ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE = true;
  }
  let ENABLE_OVERFLOW_ANCHOR_CAPABLE = false;
  const isOverflowAnchorSupport = CSS.supports('overflow-anchor', 'auto');
  if (!isOverflowAnchorSupport) {
    console.warn("Your browser does not support css property 'overflow-anchor'.\nPlease upgrade to the latest version.".trim());
  } else {
    ENABLE_OVERFLOW_ANCHOR_CAPABLE = true;
  }
  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.
  const ENABLE_OVERFLOW_ANCHOR = ENABLE_OVERFLOW_ANCHOR_PREFERRED && ENABLE_OVERFLOW_ANCHOR_CAPABLE && ENABLE_NO_SMOOTH_TRANSFORM;
  const ENABLE_DELAYED_CHAT_OCCURRENCE = ENABLE_DELAYED_CHAT_OCCURRENCE_PREFERRED && ENABLE_DELAYED_CHAT_OCCURRENCE_CAPABLE && ENABLE_OVERFLOW_ANCHOR && ENABLE_NO_SMOOTH_TRANSFORM && NOT_FIREFOX;
  let hasTimerModified = null;
  const DO_CHECK_TICKER_BACKGROUND_OVERRIDED = !!ATTEMPT_ANIMATED_TICKER_BACKGROUND || ENABLE_RAF_HACK_TICKERS;
  const fxOperator = (proto, propertyName) => {
    let propertyDescriptorGetter = null;
    try {
      propertyDescriptorGetter = Object.getOwnPropertyDescriptor(proto, propertyName).get;
    } catch (e) { }
    return typeof propertyDescriptorGetter === 'function' ? (e) => {
      try {
        return propertyDescriptorGetter.call(dr(e));
      } catch (e) { }
      return e[propertyName];
    } : (e) => e[propertyName];
  };
  const nodeParent = fxOperator(Node.prototype, 'parentNode');
  // const nFirstElem = fxOperator(HTMLElement.prototype, 'firstElementChild');
  const nPrevElem = fxOperator(HTMLElement.prototype, 'previousElementSibling');
  const nNextElem = fxOperator(HTMLElement.prototype, 'nextElementSibling');
  const nLastElem = fxOperator(HTMLElement.prototype, 'lastElementChild');
  const groupCollapsed = (text1, text2) => {
    console.groupCollapsed(`%c${text1}%c${text2}`,
      "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;",
      "background-color: #010502; color: #6ad9fe; font-weight: 300; padding: 2px;"
    );
  }
  // const microNow = () => performance.now() + (performance.timeOrigin || performance.timing.navigationStart);
  const EVENT_KEY_ON_REGISTRY_READY = "ytI-ce-registry-created";
  const onRegistryReady = (callback) => {
    if (typeof customElements === 'undefined') {
      if (!('__CE_registry' in document)) {
        // https://github.com/webcomponents/polyfills/
        Object.defineProperty(document, '__CE_registry', {
          get() {
            // return undefined
          },
          set(nv) {
            if (typeof nv == 'object') {
              delete this.__CE_registry;
              this.__CE_registry = nv;
              this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
            }
            return true;
          },
          enumerable: false,
          configurable: true
        })
      }
      let eventHandler = (evt) => {
        document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
        const f = callback;
        callback = null;
        eventHandler = null;
        f();
      };
      document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
    } else {
      callback();
    }
  };
  const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  const renderReadyPn = typeof ResizeObserver !== 'undefined' ? (sizingTarget) => {
    return new Promise(resolve => {
      let ro = new ResizeObserver(entries => {
        if (entries && entries.length >= 1) {
          resolve();
          ro.disconnect();
          ro = null;
        }
      });
      ro.observe(sizingTarget);
    });
  } : (sizingTarget) => {
    return new Promise(resolve => {
      let io = new IntersectionObserver(entries => {
        if (entries && entries.length >= 1) {
          resolve();
          io.disconnect();
          io = null;
        }
      });
      io.observe(sizingTarget);
    });
  };
  /* globals WeakRef:false */
  /** @type {(o: Object | null) => WeakRef | null} */
  const mWeakRef = typeof WeakRef === 'function' ? (o => o ? new WeakRef(o) : null) : (o => o || null);
  /** @type {(wr: Object | null) => Object | null} */
  const kRef = (wr => (wr && wr.deref) ? wr.deref() : wr);
  const getLCRDummy = () => {
    // direct createElement or createComponent_ will make the emoji rendering crashed. reason TBC
    return Promise.all([customElements.whenDefined('yt-live-chat-app'), customElements.whenDefined('yt-live-chat-renderer')]).then(async () => {
      const tag = "yt-live-chat-renderer"
      let dummy = document.querySelector(tag);
      if (!dummy) {
        let mo = null;
        const ytLiveChatApp = document.querySelector('yt-live-chat-app') || document.createElement('yt-live-chat-app');
        const lcaProto = getProto(ytLiveChatApp);
        dummy = await new Promise(resolve => {
          if (typeof lcaProto.createComponent_ === 'function' && !lcaProto.createComponent99_) {
            lcaProto.createComponent99_ = lcaProto.createComponent_;
            lcaProto.createComponent98_ = function (a, b, c) {
              // (3) ['yt-live-chat-renderer', {…}, true]
              const r = this.createComponent99_.apply(this, arguments);
              if (a === 'yt-live-chat-renderer') {
                resolve(r);
              }
              return r;
            };
            lcaProto.createComponent_ = lcaProto.createComponent98_;
          } else {
            mo = new MutationObserver(() => {
              const t = document.querySelector(tag);
              if (t) {
                resolve(t);
              }
            });
            mo.observe(document, { subtree: true, childList: true })
          }
        });
        if (mo) {
          mo.disconnect();
          mo.takeRecords();
          mo = null;
        }
        if (lcaProto.createComponent99_ && lcaProto.createComponent_ && lcaProto.createComponent98_ === lcaProto.createComponent_) {
          lcaProto.createComponent_ = lcaProto.createComponent99_;
          lcaProto.createComponent99_ = null;
          lcaProto.createComponent98_ = null;
        }
      }
      return dummy;
    });
  }
  const { addCssManaged } = (() => {
    const addFontPreRendering = () => {
      groupCollapsed("YouTube Super Fast Chat", " | Fonts Pre-Rendering");
      let efsContainer = document.createElement('elzm-fonts');
      efsContainer.id = 'elzm-fonts-yk75g'
      const arr = [];
      let p = document.createElement('elzm-font');
      arr.push(p);
      if (ENABLE_FONT_PRE_RENDERING & 1) {
        for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
          p = document.createElement('elzm-font');
          p.style.fontWeight = size;
          arr.push(p);
        }
      }
      if (ENABLE_FONT_PRE_RENDERING & 2) {
        for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
          p = document.createElement('elzm-font');
          p.style.fontFamily = 'Roboto';
          p.style.fontWeight = size;
          arr.push(p);
        }
      }
      if (ENABLE_FONT_PRE_RENDERING & 4) {
        for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
          p = document.createElement('elzm-font');
          p.style.fontFamily = '"YouTube Noto",Roboto,Arial,Helvetica,sans-serif';
          p.style.fontWeight = size;
          arr.push(p);
        }
      }
      if (ENABLE_FONT_PRE_RENDERING & 8) {
        for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
          p = document.createElement('elzm-font');
          p.style.fontFamily = '"Noto",Roboto,Arial,Helvetica,sans-serif';
          p.style.fontWeight = size;
          arr.push(p);
        }
      }
      if (ENABLE_FONT_PRE_RENDERING & 16) {
        for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
          p = document.createElement('elzm-font');
          p.style.fontFamily = 'sans-serif';
          p.style.fontWeight = size;
          arr.push(p);
        }
      }
      console.log('number of elzm-font elements', arr.length);
      HTMLElement.prototype.append.apply(efsContainer, arr);
      (document.body || document.documentElement).appendChild(efsContainer);
      console.log('elzm-font elements have been added to the page for rendering.');
      console.groupEnd();
    }
    let isCssAdded = false;
    function addCssElement() {
      let s = document.createElement('style');
      s.id = 'ewRvC';
      return s;
    }
    const addCssManaged = () => {
      if (!isCssAdded && document.documentElement && document.head) {
        isCssAdded = true;
        document.head.appendChild(dr(addCssElement())).textContent = addCss();
        if (ENABLE_FONT_PRE_RENDERING) {
          Promise.resolve().then(addFontPreRendering)
        }
      }
    }
    return { addCssManaged };
  })();
  const { setupStyle } = (() => {
    const sp7 = Symbol();
    const proxyHelperFn = (dummy) => ({
      get(target, prop) {
        return (prop in dummy) ? dummy[prop] : prop === sp7 ? target : target[prop];
      },
      set(target, prop, value) {
        if (!(prop in dummy)) {
          target[prop] = value;
        }
        return true;
      },
      has(target, prop) {
        return (prop in target);
      },
      deleteProperty(target, prop) {
        return true;
      },
      ownKeys(target) {
        return Object.keys(target);
      },
      defineProperty(target, key, descriptor) {
        return Object.defineProperty(target, key, descriptor);
      },
      getOwnPropertyDescriptor(target, key) {
        return Object.getOwnPropertyDescriptor(target, key);
      },
    });
    const setupStyle = (m1, m2) => {
      if (!ENABLE_NO_SMOOTH_TRANSFORM) return;
      const dummy1v = {
        transform: '',
        height: '',
        minHeight: '',
        paddingBottom: '',
        paddingTop: ''
      };
      const dummyStyleFn = (k) => (function () { const style = this[sp7]; return style[k](...arguments); });
      for (const k of ['toString', 'getPropertyPriority', 'getPropertyValue', 'item', 'removeProperty', 'setProperty']) {
        dummy1v[k] = dummyStyleFn(k);
      }
      const dummy1p = proxyHelperFn(dummy1v);
      const sp1v = new Proxy(m1.style, dummy1p);
      const sp2v = new Proxy(m2.style, dummy1p);
      Object.defineProperty(m1, 'style', { get() { return sp1v }, set() { }, enumerable: true, configurable: true });
      Object.defineProperty(m2, 'style', { get() { return sp2v }, set() { }, enumerable: true, configurable: true });
      m1.removeAttribute("style");
      m2.removeAttribute("style");
    }
    return { setupStyle };
  })();
  function setThumbnails(config) {
    const { baseObject, thumbnails, flag0, imageLinks } = config;
    if (flag0 || (ENABLE_PRELOAD_THUMBNAIL && imageLinks)) {
      if (thumbnails && thumbnails.length > 0) {
        if (flag0 > 0 && thumbnails.length > 1) {
          let pSize = 0;
          let newThumbnails = [];
          for (const thumbnail of thumbnails) {
            if (!thumbnail || !thumbnail.url) continue;
            const squarePhoto = thumbnail.width === thumbnail.height && typeof thumbnail.width === 'number';
            const condSize = pSize <= 0 || (flag0 === 1 ? pSize > thumbnail.width : pSize < thumbnail.width);
            const leastSizeFulfilled = squarePhoto ? thumbnail.width >= LEAST_IMAGE_SIZE : true;
            if ((!squarePhoto || condSize) && leastSizeFulfilled) {
              newThumbnails.push(thumbnail);
              if (imageLinks) imageLinks.add(thumbnail.url);
            }
            if (squarePhoto && condSize && leastSizeFulfilled) {
              pSize = thumbnail.width;
            }
          }
          if (thumbnails.length !== newThumbnails.length && thumbnails === baseObject.thumbnails && newThumbnails.length > 0) {
            baseObject.thumbnails = newThumbnails;
          } else {
            newThumbnails.length = 0;
          }
          newThumbnails = null;
        } else {
          for (const thumbnail of thumbnails) {
            if (thumbnail && thumbnail.url) {
              if (imageLinks) imageLinks.add(thumbnail.url);
            }
          }
        }
      }
    }
  }
  function fixLiveChatItem(item, imageLinks) {
    const liveChatTextMessageRenderer = (item || 0).liveChatTextMessageRenderer || 0;
    if (liveChatTextMessageRenderer) {
      const messageRuns = (liveChatTextMessageRenderer.message || 0).runs || 0;
      if (messageRuns && messageRuns.length > 0) {
        for (const run of messageRuns) {
          const emojiImage = (((run || 0).emoji || 0).image || 0);
          setThumbnails({
            baseObject: emojiImage,
            thumbnails: emojiImage.thumbnails,
            flag0: EMOJI_IMAGE_SINGLE_THUMBNAIL,
            imageLinks
          });
        }
      }
      const authorPhoto = liveChatTextMessageRenderer.authorPhoto || 0;
      setThumbnails({
        baseObject: authorPhoto,
        thumbnails: authorPhoto.thumbnails,
        flag0: AUTHOR_PHOTO_SINGLE_THUMBNAIL,
        imageLinks
      });
    }
  }
  let kptPF = null;
  const emojiPrefetched = new Set();
  const authorPhotoPrefetched = new Set();
  function linker(link, rel, href, _as) {
    return new Promise(resolve => {
      if (!link) link = document.createElement('link');
      link.rel = rel;
      if (_as) link.setAttribute('as', _as);
      link.onload = function () {
        resolve({
          link: this,
          success: true
        })
        this.remove();
      };
      link.onerror = function () {
        resolve({
          link: this,
          success: false
        });
        this.remove();
      };
      link.href = href;
      document.head.appendChild(link);
      link = null;
    });
  }
  const cleanContext = async (win) => {
    const waitFn = requestAnimationFrame; // shall have been binded to window
    try {
      let mx = 16; // MAX TRIAL
      const frameId = 'vanillajs-iframe-v1';
      /** @type {HTMLIFrameElement | null} */
      let frame = document.getElementById(frameId);
      let removeIframeFn = null;
      if (!frame) {
        frame = document.createElement('iframe');
        frame.id = frameId;
        const blobURL = typeof webkitCancelAnimationFrame === 'function' ? (frame.src = URL.createObjectURL(new Blob([], { type: 'text/html' }))) : null; // avoid Brave Crash
        frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
        let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
        n.appendChild(frame);
        while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
        const root = document.documentElement;
        root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
        if (blobURL) Promise.resolve().then(() => URL.revokeObjectURL(blobURL));
        removeIframeFn = (setTimeout) => {
          const removeIframeOnDocumentReady = (e) => {
            e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
            e = n;
            n = win = removeIframeFn = 0;
            setTimeout ? setTimeout(() => e.remove(), 200) : e.remove();
          }
          if (!setTimeout || document.readyState !== 'loading') {
            removeIframeOnDocumentReady();
          } else {
            win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
          }
        }
      }
      while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
      const fc = frame.contentWindow;
      if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
      try {
        const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, getComputedStyle } = fc;
        const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, getComputedStyle };
        for (let k in res) res[k] = res[k].bind(win); // necessary
        if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
        /** @type {HTMLElement} */
        const HTMLElementProto = fc.HTMLElement.prototype;
        /** @type {EventTarget} */
        const EventTargetProto = fc.EventTarget.prototype;
        // jsonParseFix = {
        //   _JSON: fc.JSON, _parse: fc.JSON.parse
        // }
        return {
          ...res,
          animate: HTMLElementProto.animate,
          addEventListener: EventTargetProto.addEventListener,
          removeEventListener: EventTargetProto.removeEventListener
        };
      } catch (e) {
        if (removeIframeFn) removeIframeFn();
        return null;
      }
    } catch (e) {
      console.warn(e);
      return null;
    }
  };
  cleanContext(win).then(__CONTEXT__ => {
    if (!__CONTEXT__) return null;
    const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, animate, getComputedStyle, addEventListener, removeEventListener } = __CONTEXT__;
    const wmComputedStyle = new WeakMap();
    const getComputedStyleCached = (elem) => {
      let cs = wmComputedStyle.get(elem);
      if (!cs) {
        cs = getComputedStyle(elem);
        wmComputedStyle.set(elem, cs);
      }
      return cs;
    }
    let foregroundPromise = null;
    const foregroundPromiseFn = () => (foregroundPromise = (foregroundPromise || new Promise(resolve => {
      requestAnimationFrame(() => {
        foregroundPromise = null;
        resolve();
      });
    })));
    let playerState = null;
    let _playerState = null;
    let lastPlayerProgress = null;
    let relayCount = 0;
    let playerEventsByIframeRelay = false;
    let isPlayProgressTriggered = false;
    let waitForInitialDataCompletion = 0;
    let aeConstructor = null;
    // << __openedChanged82 >>
    let currentMenuPivotWR = null;
    // << if DO_PARTICIPANT_LIST_HACKS >>
    const beforeParticipantsMap = new WeakMap();
    // << end >>
    // << if onRegistryReadyForDOMOperations >>
    let dt0 = Date.now() - 2000;
    const dateNow = () => Date.now() - dt0;
    // let lastScroll = 0;
    // let lastLShow = 0;
    let lastWheel = 0;
    let lastMouseDown = 0;
    let lastMouseUp = 0;
    let currentMouseDown = false;
    let lastTouchDown = 0;
    let lastTouchUp = 0;
    let currentTouchDown = false;
    let lastUserInteraction = 0;
    let scrollChatFn = null;
    let skipDontRender = true; // true first; false by flushActiveItems_
    let allowDontRender = null;
    // ---- #items mutation ----
    let sk35zResolveFn = null;
    let firstList = true;
    // << end >>
    class RAFHub {
      constructor() {
        /** @type {number} */
        this.startAt = 8170;
        /** @type {number} */
        this.counter = 0;
        /** @type {number} */
        this.rid = 0;
        /** @type {Map<number, FrameRequestCallback>} */
        this.funcs = new Map();
        const funcs = this.funcs;
        /** @type {FrameRequestCallback} */
        this.bCallback = this.mCallback.bind(this);
        this.pClear = () => funcs.clear();
        this.keepRAF = false;
      }
      /** @param {DOMHighResTimeStamp} highResTime */
      mCallback(highResTime) {
        this.rid = 0;
        Promise.resolve().then(this.pClear);
        this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
      }
      /** @param {FrameRequestCallback} f */
      request(f) {
        if (this.counter > 1e9) this.counter = 9;
        let cid = this.startAt + (++this.counter);
        this.funcs.set(cid, f);
        if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
        return cid;
      }
      /** @param {number} cid */
      cancel(cid) {
        cid = +cid;
        if (cid > 0) {
          if (cid <= this.startAt) {
            return cancelAnimationFrame(cid);
          }
          if (this.rid > 0) {
            this.funcs.delete(cid);
            if (this.funcs.size === 0 && !this.keepRAF) {
              cancelAnimationFrame(this.rid);
              this.rid = 0;
            }
          }
        }
      }
    }
    function basePrefetching() {
      new Promise(resolve => {
        if (document.readyState !== 'loading') {
          resolve();
        } else {
          win.addEventListener("DOMContentLoaded", resolve, false);
        }
      }).then(() => {
        const hostL1 = [
          'https://www.youtube.com', 'https://googlevideo.com',
          'https://googleapis.com', 'https://accounts.youtube.com',
          'https://www.gstatic.com', 'https://ggpht.com',
          'https://yt3.ggpht.com', 'https://yt4.ggpht.com'
        ];
        const hostL2 = [
          'https://youtube.com',
          'https://fonts.googleapis.com', 'https://fonts.gstatic.com'
        ];
        let link = null;
        function kn() {
          link = document.createElement('link');
          if (link.relList && link.relList.supports) {
            kptPF = (link.relList.supports('dns-prefetch') ? 1 : 0) + (link.relList.supports('preconnect') ? 2 : 0) + (link.relList.supports('prefetch') ? 4 : 0) + (link.relList.supports('subresource') ? 8 : 0) + (link.relList.supports('preload') ? 16 : 0)
          } else {
            kptPF = 0;
          }
          groupCollapsed("YouTube Super Fast Chat", " | PREFETCH SUPPORTS");
          if (ENABLE_BASE_PREFETCHING) console.log('dns-prefetch', (kptPF & 1) ? 'OK' : 'NG');
          if (ENABLE_BASE_PREFETCHING) console.log('preconnect', (kptPF & 2) ? 'OK' : 'NG');
          if (ENABLE_PRELOAD_THUMBNAIL) console.log('prefetch', (kptPF & 4) ? 'OK' : 'NG');
          // console.log('subresource', (kptPF & 8) ? 'OK' : 'NG');
          if (ENABLE_PRELOAD_THUMBNAIL) console.log('preload', (kptPF & 16) ? 'OK' : 'NG');
          console.groupEnd();
        }
        for (const h of hostL1) {
          if (kptPF === null) kn();
          if (ENABLE_BASE_PREFETCHING) {
            // if (kptPF & 1) {
            //   linker(link, 'dns-prefetch', h);
            //   link = null;
            // }
            if (kptPF & 2) {
              linker(link, 'preconnect', h);
              link = null;
            }
          }
        }
        for (const h of hostL2) {
          if (kptPF === null) kn();
          if (ENABLE_BASE_PREFETCHING) {
            if (kptPF & 1) {
              linker(link, 'dns-prefetch', h);
              link = null;
            }
          }
        }
      })
    }
    if (DO_LINK_PREFETCH) basePrefetching();
    const { notifyPath7081 } = (() => {
      // DO_PARTICIPANT_LIST_HACKS
      const mutexParticipants = new Mutex();
      let uvid = 0;
      let r95dm = 0;
      let c95dm = -1;
      const foundMap = (base, content) => {
        /*
          let lastSearch = 0;
          let founds = base.map(baseEntry => {
            let search = content.indexOf(baseEntry, lastSearch);
            if (search < 0) return false;
            lastSearch = search + 1;
            return true;
          });
          return founds;
        */
        const contentSet = new Set(content);
        return base.map(baseEntry => contentSet.has(baseEntry));
      }
      const spliceIndicesFunc = (beforeParticipants, participants, idsBefore, idsAfter) => {
        const handler1 = {
          get(target, prop, receiver) {
            if (prop === 'object') {
              return participants; // avoid memory leakage
            }
            if (prop === 'type') {
              return 'splice';
            }
            if (prop === '__proxy312__') return 1;
            return target[prop];
          }
        };
        const releaser = () => {
          participants = null;
        }
        let foundsForAfter = foundMap(idsAfter, idsBefore);
        let foundsForBefore = foundMap(idsBefore, idsAfter);
        let indexSplices = [];
        let contentUpdates = [];
        for (let i = 0, j = 0; i < foundsForBefore.length || j < foundsForAfter.length;) {
          if (beforeParticipants[i] === participants[j]) {
            i++; j++;
          } else if (idsBefore[i] === idsAfter[j]) {
            // content changed
            contentUpdates.push({ indexI: i, indexJ: j })
            i++; j++;
          } else {
            let addedCount = 0;
            for (let q = j; q < foundsForAfter.length; q++) {
              if (foundsForAfter[q] === false) addedCount++;
              else break;
            }
            let removedCount = 0;
            for (let q = i; q < foundsForBefore.length; q++) {
              if (foundsForBefore[q] === false) removedCount++;
              else break;
            }
            if (!addedCount && !removedCount) {
              throw 'ERROR(0xFF32): spliceIndicesFunc';
            }
            indexSplices.push(new Proxy({
              index: j,
              addedCount: addedCount,
              removed: removedCount >= 1 ? beforeParticipants.slice(i, i + removedCount) : []
            }, handler1));
            i += removedCount;
            j += addedCount;
          }
        }
        foundsForBefore = null;
        foundsForAfter = null;
        idsBefore = null;
        idsAfter = null;
        beforeParticipants = null;
        return { indexSplices, contentUpdates, releaser };
      }
      /*
      customElements.get("yt-live-chat-participant-renderer").prototype.notifyPath=function(){  console.log(123);  console.log(new Error().stack)}
      VM63631:1 Error
      at customElements.get.notifyPath (<anonymous>:1:122)
      at e.forwardRendererStamperChanges_ (live_chat_polymer.js:4453:35)
      at e.rendererStamperApplyChangeRecord_ (live_chat_polymer.js:4451:12)
      at e.rendererStamperObserver_ (live_chat_polymer.js:4448:149)
      at Object.pu [as fn] (live_chat_polymer.js:1692:118)
      at ju (live_chat_polymer.js:1674:217)
      at a._propertiesChanged (live_chat_polymer.js:1726:122)
      at b._flushProperties (live_chat_polymer.js:1597:200)
      at a._invalidateProperties (live_chat_polymer.js:1718:69)
      at a.notifyPath (live_chat_polymer.js:1741:182)
      */
      function convertToIds(participants) {
        return participants.map(participant => {
          if (!participant || typeof participant !== 'object') {
            console.warn('Error(0xFA41): convertToIds', participant);
            return participant; // just in case
          }
          let keys = Object.keys(participant);
          // liveChatTextMessageRenderer
          // liveChatParticipantRenderer - livestream channel owner [no authorExternalChannelId]
          // liveChatPaidMessageRenderer
          /*
            'yt-live-chat-participant-renderer' utilizes the following:
            authorName.simpleText: string
            authorPhoto.thumbnails: Object{url:string, width:int, height:int} []
            authorBadges[].liveChatAuthorBadgeRenderer.icon.iconType: string
            authorBadges[].liveChatAuthorBadgeRenderer.tooltip: string
            authorBadges[].liveChatAuthorBadgeRenderer.accessibility.accessibilityData: Object{label:string}
          */
          if (keys.length !== 1) {
            console.warn('Error(0xFA42): convertToIds', participant);
            return participant; // just in case
          }
          let key = keys[0];
          let renderer = (participant[key] || 0);
          let authorName = (renderer.authorName || 0);
          let text = `${authorName.simpleText || authorName.text}`
          let res = participant; // fallback if it is not a vaild entry
          if (typeof text !== 'string') {
            console.warn('Error(0xFA53): convertToIds', participant);
          } else {
            text = `${renderer.authorExternalChannelId || 'null'}|${text || ''}`;
            if (text.length > 1) res = text;
          }
          return res;
          // return renderer?`${renderer.id}|${renderer.authorExternalChannelId}`: '';
          // note: renderer.id will be changed if the user typed something to trigger the update of the participants' record.
        });
      }
      const checkChangeToParticipantRendererContent = CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT ? (p1, p2) => {
        // just update when content is changed.
        if (p1.authorName !== p2.authorName) return true;
        if (p1.authorPhoto !== p2.authorPhoto) return true;
        if (p1.authorBadges !== p2.authorBadges) return true;
        return false;
      } : (p1, p2) => {
        // keep integrity all the time.
        return p1 !== p2; // always true
      }
      function notifyPath7081(path) { // cnt "yt-live-chat-participant-list-renderer"
        if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
          if (path !== "participantsManager.participants") {
            return this.__notifyPath5036__.apply(this, arguments);
          }
          if (c95dm === r95dm) return;
        } else {
          const stack = new Error().stack;
          if (path !== "participantsManager.participants" || stack.indexOf('.onParticipantsChanged') < 0) {
            return this.__notifyPath5036__.apply(this, arguments);
          }
        }
        if (uvid > 1e8) uvid = uvid % 100;
        let tid = ++uvid;
        const cnt = this; // "yt-live-chat-participant-list-renderer"
        mutexParticipants.lockWith(lockResolve => {
          const participants00 = cnt.participantsManager.participants;
          if (tid !== uvid || typeof (participants00 || 0).splice !== 'function') {
            lockResolve();
            return;
          }
          let doUpdate = false;
          if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
            if (!participants00.r94dm) {
              participants00.r94dm = 1;
              if (++r95dm > 1e9) r95dm = 9;
              participants00.push = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.push.apply(this, arguments);
              }
              participants00.pop = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.pop.apply(this, arguments);
              }
              participants00.shift = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.shift.apply(this, arguments);
              }
              participants00.unshift = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.unshift.apply(this, arguments);
              }
              participants00.splice = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.splice.apply(this, arguments);
              }
              participants00.sort = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.sort.apply(this, arguments);
              }
              participants00.reverse = function () {
                if (++r95dm > 1e9) r95dm = 9;
                return Array.prototype.reverse.apply(this, arguments);
              }
            }
            if (c95dm !== r95dm) {
              c95dm = r95dm;
              doUpdate = true;
            }
          } else {
            doUpdate = true;
          }
          if (!doUpdate) {
            lockResolve();
            return;
          }
          const participants = participants00.slice(0);
          const beforeParticipants = beforeParticipantsMap.get(cnt) || [];
          beforeParticipantsMap.set(cnt, participants);
          const resPromise = (async () => {
            if (beforeParticipants.length === 0) {
              // not error
              return 0;
            }
            let countOfElements = cnt.__getAllParticipantsDOMRenderedLength__()
            // console.log(participants.length, doms.length) // different if no requestAnimationFrame
            if (beforeParticipants.length !== countOfElements) {
              // there is somewrong for the cache. - sometimes happen
              return 0;
            }
            const idsBefore = convertToIds(beforeParticipants);
            const idsAfter = convertToIds(participants);
            let { indexSplices, contentUpdates, releaser } = spliceIndicesFunc(beforeParticipants, participants, idsBefore, idsAfter);
            let res = 1; // default 1 for no update
            if (indexSplices.length >= 1) {
              // let p2 =  participants.slice(indexSplices[0].index, indexSplices[0].index+indexSplices[0].addedCount);
              // let p1 = indexSplices[0].removed;
              // console.log(indexSplices.length, indexSplices ,p1,p2,  convertToIds(p1),convertToIds(p2))
              /* folllow
                  a.notifyPath(c + ".splices", d);
                  a.notifyPath(c + ".length", b.length);
              */
              // stampDomArraySplices_
              await new Promise(resolve => {
                cnt.resolveForDOMRendering781 = resolve;
                cnt.__notifyPath5036__("participantsManager.participants.splices", {
                  indexSplices
                });
                indexSplices = null;
                releaser();
                releaser = null;
                cnt.__notifyPath5036__("participantsManager.participants.length",
                  participants.length
                );
              });
              await Promise.resolve(0); // play safe for the change of 'length'
              countOfElements = cnt.__getAllParticipantsDOMRenderedLength__();
              let wrongSize = participants.length !== countOfElements
              if (wrongSize) {
                console.warn("ERROR(0xE2C3): notifyPath7081", beforeParticipants.length, participants.length, doms.length)
                return 0;
              }
              res = 2 | 4;
            } else {
              indexSplices = null;
              releaser();
              releaser = null;
              if (participants.length !== countOfElements) {
                // other unhandled cases
                return 0;
              }
            }
            // participants.length === countOfElements before contentUpdates
            if (contentUpdates.length >= 1) {
              for (const contentUpdate of contentUpdates) {
                let isChanged = checkChangeToParticipantRendererContent(beforeParticipants[contentUpdate.indexI], participants[contentUpdate.indexJ]);
                if (isChanged) {
                  cnt.__notifyPath5036__(`participantsManager.participants[${contentUpdate.indexJ}]`);
                  res |= 4 | 8;
                }
              }
            }
            contentUpdates = null;
            return res;
          })();
          resPromise.then(resValue => {
            const isLogRequired = SHOW_PARTICIPANT_CHANGES_IN_CONSOLE && ((resValue === 0) || ((resValue & 4) === 4));
            isLogRequired && groupCollapsed("Participant List Change", `tid = ${tid}; res = ${resValue}`);
            if (resValue === 0) {
              new Promise(resolve => {
                cnt.resolveForDOMRendering781 = resolve;
                isLogRequired && console.log("Full Refresh begins");
                cnt.__notifyPath5036__("participantsManager.participants"); // full refresh
              }).then(() => {
                isLogRequired && console.log("Full Refresh ends");
                console.groupEnd();
              }).then(lockResolve);
              return;
            }
            const delayLockResolve = (resValue & 4) === 4;
            if (delayLockResolve) {
              isLogRequired && console.log(`Number of participants (before): ${beforeParticipants.length}`);
              isLogRequired && console.log(`Number of participants (after): ${participants.length}`);
              isLogRequired && console.log(`Total number of rendered participants: ${cnt.__getAllParticipantsDOMRenderedLength__()}`);
              isLogRequired && console.log(`Participant Renderer Content Updated: ${(resValue & 8) === 8}`);
              isLogRequired && console.groupEnd();
              // requestAnimationFrame is required to avoid particiant update during DOM changing (stampDomArraySplices_)
              // mutex lock with requestAnimationFrame can also disable participants update in background
              requestAnimationFrame(lockResolve);
            } else {
              lockResolve();
            }
          });
        });
      }
      return { notifyPath7081 };
    })();
    const whenDefinedMultiple = async (tags) => {
      const sTags = [...new Set(tags)];
      const len = sTags.length;
      const pTags = new Array(len);
      for (let i = 0; i < len; i++) {
        pTags[i] = customElements.whenDefined(sTags[i]);
      }
      await Promise.all(pTags);
      pTags.length = 0;
      return sTags;
    }
    const onRegistryReadyForDataManipulation = () => {
      function dummy5035(a, b, c) { }
      function dummy411(a, b, c) { }
      customElements.whenDefined("yt-live-chat-participant-list-renderer").then(() => {
        if (!DO_PARTICIPANT_LIST_HACKS) return;
        const tag = "yt-live-chat-participant-list-renderer";
        const cProto = getProto(document.createElement(tag));
        if (!cProto || typeof cProto.attached !== 'function') {
          // for _registered, proto.attached shall exist when the element is defined.
          // for controller extraction, attached shall exist when instance creates.
          console.warn(`proto.attached for ${tag} is unavailable.`);
          return;
        }
        groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-participant-list-renderer hacks");
        const fgsArr = ['kevlar_tuner_should_test_maintain_stable_list', 'kevlar_should_maintain_stable_list', 'kevlar_tuner_should_test_reuse_components', 'kevlar_tuner_should_reuse_components'];
        const fgs = {};
        for (const key of fgsArr) fgs[key] = undefined;
        try {
          const EXPERIMENT_FLAGS = ytcfg.data_.EXPERIMENT_FLAGS;
          for (const key of fgsArr) fgs[key] = EXPERIMENT_FLAGS[key];
        } catch (e) { }
        console.log(`EXPERIMENT_FLAGS: ${JSON.stringify(fgs, null, 2)}`);
        const canDoReplacement = (() => {
          if (typeof cProto.__notifyPath5035__ === 'function' && cProto.__notifyPath5035__.name !== 'dummy5035') {
            console.warn('YouTube Live Chat Tamer is running.');
            return;
          }
          if (typeof cProto.__attached411__ === 'function' && cProto.__attached411__.name !== 'dummy411') {
            console.warn('YouTube Live Chat Tamer is running.');
            return;
          }
          cProto.__notifyPath5035__ = dummy5035 // just to against Live Chat Tamer
          cProto.__attached411__ = dummy411 // just to against Live Chat Tamer
          if (typeof cProto.flushRenderStamperComponentBindings_ !== 'function' || cProto.flushRenderStamperComponentBindings_.length !== 0) {
            console.warn("ERROR(0xE355): cProto.flushRenderStamperComponentBindings_ not found");
            return;
          }
          if (typeof cProto.flushRenderStamperComponentBindings66_ === 'function') {
            console.warn("ERROR(0xE356): cProto.flushRenderStamperComponentBindings66_");
            return;
          }
          if (typeof cProto.__getAllParticipantsDOMRenderedLength__ === 'function') {
            console.warn("ERROR(0xE357): cProto.__getAllParticipantsDOMRenderedLength__");
            return;
          }
          return true;
        })();
        console.log(`Data Manipulation Boost = ${canDoReplacement}`);
        assertor(() => fnIntegrity(cProto.attached, '0.32.22')) // just warning
        if (typeof cProto.flushRenderStamperComponentBindings_ === 'function') {
          const fiRSCB = fnIntegrity(cProto.flushRenderStamperComponentBindings_);
          const s = fiRSCB.split('.');
          // Feb 2024: 0.403.247 => NG
          // if (s[0] === '0' && +s[1] > 381 && +s[1] < 391 && +s[2] > 228 && +s[2] < 238) {
          //   console.log(`flushRenderStamperComponentBindings_ ### ${fiRSCB} ### - OK`);
          // } else {
          //   console.log(`flushRenderStamperComponentBindings_ ### ${fiRSCB} ### - NG`);
          // }
          console.log(`flushRenderStamperComponentBindings_ ### ${fiRSCB} ###`);
        } else {
          console.log("flushRenderStamperComponentBindings_ - not found");
        }
        // assertor(() => fnIntegrity(cProto.flushRenderStamperComponentBindings_, '0.386.233')) // just warning
        if (typeof cProto.flushRenderStamperComponentBindings_ === 'function') {
          cProto.flushRenderStamperComponentBindings66_ = cProto.flushRenderStamperComponentBindings_;
          cProto.flushRenderStamperComponentBindings_ = function () {
            // console.log('flushRenderStamperComponentBindings_')
            this.flushRenderStamperComponentBindings66_();
            if (this.resolveForDOMRendering781) {
              this.resolveForDOMRendering781();
              this.resolveForDOMRendering781 = null;
            }
          };
        }
        cProto.__getAllParticipantsDOMRenderedLength__ = function () {
          const container = ((this || 0).$ || 0).participants;
          if (!container) return 0;
          return HTMLElement.prototype.querySelectorAll.call(container, 'yt-live-chat-participant-renderer').length;
        }
        const onPageElements = [...document.querySelectorAll('yt-live-chat-participant-list-renderer:not(.n9fJ3)')];
        cProto.__attached412__ = cProto.attached;
        const fpPList = function (hostElement) {
          const cnt = insp(hostElement);
          if (beforeParticipantsMap.has(cnt)) return;
          hostElement.classList.add('n9fJ3');
          assertor(() => (cnt.__dataEnabled === true && cnt.__dataReady === true));
          if (typeof cnt.notifyPath !== 'function' || typeof cnt.__notifyPath5036__ !== 'undefined') {
            console.warn("ERROR(0xE318): yt-live-chat-participant-list-renderer")
            return;
          }
          groupCollapsed("Participant List attached", "");
          // cnt.$.participants.appendChild = cnt.$.participants.__shady_native_appendChild =  function(){
          //   console.log(123, 'appendChild');
          //   return HTMLElement.prototype.appendChild.apply(this, arguments)
          // }
          // cnt.$.participants.insertBefore =cnt.$.participants.__shady_native_insertBefore =  function(){
          //   console.log(123, 'insertBefore');
          //   return HTMLElement.prototype.insertBefore.apply(this, arguments)
          // }
          cnt.__notifyPath5036__ = cnt.notifyPath
          const participants = ((cnt.participantsManager || 0).participants || 0);
          assertor(() => (participants.length > -1 && typeof participants.slice === 'function'));
          console.log(`initial number of participants: ${participants.length}`);
          const newParticipants = (participants.length >= 1 && typeof participants.slice === 'function') ? participants.slice(0) : [];
          beforeParticipantsMap.set(cnt, newParticipants);
          cnt.notifyPath = notifyPath7081;
          console.log(`CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = ${CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT}`);
          console.groupEnd();
        }
        cProto.attached = function () {
          fpPList(this.hostElement || this);
          this.__attached412__.apply(this, arguments);
        };
        if (ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST) {
          /** @type {boolean | (()=>boolean)} */
          let toUseMaintainStableList = USE_MAINTAIN_STABLE_LIST_ONLY_WHEN_KS_FLAG_IS_SET ? (() => ytcfg.data_.EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list === true) : true;
          if (typeof cProto.stampDomArray_ === 'function' && cProto.stampDomArray_.length === 6 && !cProto.stampDomArray_.nIegT && !cProto.stampDomArray66_) {
            let lastMessageDate = 0;
            cProto.stampDomArray66_ = cProto.stampDomArray_;
            cProto.stampDomArray_ = function (...args) {
              if (args[0] && args[0].length > 0 && args[1] === "participants" && args[2] && args[3] === true && !args[5]) {
                if (typeof toUseMaintainStableList === 'function') {
                  toUseMaintainStableList = toUseMaintainStableList();
                }
                args[5] = toUseMaintainStableList;
                let currentDate = Date.now();
                if (currentDate - lastMessageDate > 440) {
                  lastMessageDate = currentDate;
                  console.log('maintain_stable_list for participants list', toUseMaintainStableList);
                }
              }
              return this.stampDomArray66_.apply(this, args);
            }
            cProto.stampDomArray_.nIegT = 1;
          }
          console.log(`ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST - YES`);
        } else {
          console.log(`ENABLE_FLAGS_MAINTAIN_STABLE_LIST_FOR_PARTICIPANTS_LIST - NO`);
        }
        console.groupEnd();
        if (onPageElements.length >= 1) {
          for (const s of onPageElements) {
            if (insp(s).isAttached === true) {
              fpPList(s);
            }
          }
        }
      }).catch(console.warn);
    };
    if (DO_PARTICIPANT_LIST_HACKS) {
      promiseForCustomYtElementsReady.then(onRegistryReadyForDataManipulation);
    }
    const rafHub = (ENABLE_RAF_HACK_TICKERS || ENABLE_RAF_HACK_DOCKED_MESSAGE || ENABLE_RAF_HACK_INPUT_RENDERER || ENABLE_RAF_HACK_EMOJI_PICKER) ? new RAFHub() : null;
    const fixChildrenIssue = !!fixChildrenIssue801;
    if (fixChildrenIssue && typeof Object.getOwnPropertyDescriptor === 'function' && typeof Proxy !== 'undefined') {
      const divProto = HTMLDivElement.prototype;
      const polymerControllerSetData3 = function (c, d, e) {
        return insp(this).set(c, d, e);
      }
      const polymerControllerSetData2 = function (c, d) {
        return insp(this).set(c, d);
      }
      const dummyFn = function () {
        console.log('dummyFn', ...arguments);
      };
      const wm44 = new Map();
      function unPolymerSet(elem) {
        const is = elem.is;
        if (is && !elem.set) {
          let rt = wm44.get(is);
          if (!rt) {
            rt = 1;
            const cnt = insp(elem);
            if (cnt !== elem && cnt && typeof cnt.set === 'function') {
              const pcSet = cnt.constructor.prototype.set;
              if (pcSet && typeof pcSet === 'function' && pcSet.length === 3) {
                rt = polymerControllerSetData3;
              } else if (pcSet && typeof pcSet === 'function' && pcSet.length === 2) {
                rt = polymerControllerSetData2;
              }
            }
            wm44.set(is, rt);
          }
          if (typeof rt === 'function') {
            elem.set = rt;
          } else {
            elem.set = dummyFn;
          }
        }
      }
      if (!divProto.__children577__ && !divProto.__children578__) {
        const dp = Object.getOwnPropertyDescriptor(Element.prototype, 'children');
        const dp2 = Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'children');
        const dp3 = Object.getOwnPropertyDescriptor(divProto, 'children');
        if (dp && dp.configurable === true && dp.enumerable === true && typeof dp.get === 'function' && !dp2 && !dp3) {
          if (divProto instanceof HTMLElement && divProto instanceof Element) {
            let m = Object.assign({}, dp);
            divProto.__children577__ = dp.get;
            divProto.__children578__ = function () {
              if (this.__children803__) return this.__children803__;
              if (this.__children801__) {
                let arr = [];
                for (let elem = this.firstElementChild; elem !== null; elem = elem.nextElementSibling) {
                  if (elem.is) {
                    unPolymerSet(elem);
                    arr.push(elem);
                  }
                }
                if (this.__children801__ === 2) this.__children803__ = arr;
                return arr;
              }
              return 577;
            };
            m.get = function () {
              const r = this.__children578__();
              if (r !== 577) return r;
              return this.__children577__();
            };
            Object.defineProperty(divProto, 'children', m);
            console.log('fixChildrenIssue - set OK')
          }
        }
      }
    }
    const bnForDelayChatOccurrence = () => {
      document.addEventListener('animationstart', (evt) => {
        if (evt.animationName === 'dontRenderAnimation') {
          evt.target.classList.remove('dont-render');
          if (scrollChatFn) scrollChatFn();
        }
      }, true);
      const f = (elm) => {
        if (elm && elm.nodeType === 1) {
          if (!skipDontRender && allowDontRender === true) {
            // innerTextFixFn();
            elm.classList.add('dont-render');
          }
        }
      }
      Node.prototype.__appendChild931__ = function (a) {
        a = dr(a);
        if (this.id === 'items' && this.classList.contains('yt-live-chat-item-list-renderer')) {
          if (a && a.nodeType === 1) f(a);
          else if (a instanceof DocumentFragment) {
            for (let n = a.firstChild; n; n = n.nextSibling) {
              f(n);
            }
          }
        }
      }
      Node.prototype.__appendChild932__ = function () {
        this.__appendChild931__.apply(this, arguments);
        return Node.prototype.appendChild.apply(this, arguments);
      }
    };
    const watchUserCSS = () => {
      // if (!CSS.supports('contain-intrinsic-size', 'auto var(--wsr94)')) return;
      const getElemFromWR = (nr) => {
        const n = kRef(nr);
        if (n && n.isConnected) return n;
        return null;
      }
      const clearContentVisibilitySizing = () => {
        Promise.resolve().then(() => {
          const e = document.querySelector('#show-more[disabled]');
          let btnShowMoreWR = e ? mWeakRef(e) : null;
          let lastVisibleItemWR = null;
          for (const elm of document.querySelectorAll('[wSr93]')) {
            if (elm.getAttribute('wSr93') === 'visible') lastVisibleItemWR = mWeakRef(elm);
            elm.setAttribute('wSr93', '');
            // custom CSS property --wsr94 not working when attribute wSr93 removed
          }
          requestAnimationFrame(() => {
            const btnShowMore = getElemFromWR(btnShowMoreWR); btnShowMoreWR = null;
            if (btnShowMore) btnShowMore.click();
            else {
              // would not work if switch it frequently
              const lastVisibleItem = getElemFromWR(lastVisibleItemWR); lastVisibleItemWR = null;
              if (lastVisibleItem) {
                Promise.resolve()
                  .then(() => lastVisibleItem.scrollIntoView())
                  .then(() => lastVisibleItem.scrollIntoView(false))
                  .then(() => lastVisibleItem.scrollIntoView({ behavior: "instant", block: "end", inline: "nearest" }))
                  .catch(e => { }) // break the chain when method not callable
              }
            }
          });
        });
      }
      const mutObserver = new MutationObserver((mutations) => {
        for (const mutation of mutations) {
          if ((mutation.addedNodes || 0).length >= 1) {
            for (const addedNode of mutation.addedNodes) {
              if (addedNode.nodeName === 'STYLE') {
                clearContentVisibilitySizing();
                return;
              }
            }
          }
          if ((mutation.removedNodes || 0).length >= 1) {
            for (const removedNode of mutation.removedNodes) {
              if (removedNode.nodeName === 'STYLE') {
                clearContentVisibilitySizing();
                return;
              }
            }
          }
        }
      });
      mutObserver.observe(document.documentElement, {
        childList: true,
        subtree: false
      });
      mutObserver.observe(document.head, {
        childList: true,
        subtree: false
      });
      mutObserver.observe(document.body, {
        childList: true,
        subtree: false
      });
    }
    class WillChangeController {
      constructor(itemScroller, willChangeValue) {
        this.element = itemScroller;
        this.counter = 0;
        this.active = false;
        this.willChangeValue = willChangeValue;
      }
      beforeOper() {
        if (!this.active) {
          this.active = true;
          this.element.style.willChange = this.willChangeValue;
        }
        this.counter++;
      }
      afterOper() {
        const c = this.counter;
        requestAnimationFrame(() => {
          if (c === this.counter) {
            this.active = false;
            this.element.style.willChange = '';
          }
        });
      }
      release() {
        const element = this.element;
        this.element = null;
        this.counter = 1e16;
        this.active = false;
        try {
          element.style.willChange = '';
        } catch (e) { }
      }
    }
    const skzData = (skz) => skz.data = {
      "message": {
        "runs": [
          {
            "text": "em2o"
          },
          {
            "emoji": {
              "emojiId": "cm35z",
              "shortcuts": [
                ":_s:",
                ":s:"
              ],
              "searchTerms": [
                "_s",
                "s"
              ],
              "image": {
                "thumbnails": [
                  {
                    "url": dummyImgURL,
                    "width": 48,
                    "height": 48
                  }
                ],
                "accessibility": {
                  "accessibilityData": {
                    "label": "s"
                  }
                }
              },
              "isCustomEmoji": true
            }
          },
          {
            "text": "ji"
          }
        ]
      },
      "authorName": {
        "simpleText": "N"
      },
      "authorPhoto": {
        "thumbnails": [
          {
            "url": dummyImgURL,
            "width": 64,
            "height": 64
          }
        ]
      },
      "contextMenuEndpoint": {
        "commandMetadata": {
          "webCommandMetadata": {
            "ignoreNavigation": true
          }
        },
        "liveChatItemContextMenuEndpoint": {
          "params": "123=="
        }
      },
      "id": "sk35z",
      "timestampUsec": "1232302352350000",
      "authorBadges": [
        {
          "liveChatAuthorBadgeRenderer": {
            "customThumbnail": {
              "thumbnails": [
                {
                  "url": dummyImgURL,
                  "width": 16,
                  "height": 16
                },
                {
                  "url": dummyImgURL,
                  "width": 32,
                  "height": 32
                }
              ]
            },
            "tooltip": "T",
            "accessibility": {
              "accessibilityData": {
                "label": "E"
              }
            }
          }
        }
      ],
      "authorExternalChannelId": "A",
      "contextMenuAccessibility": {
        "accessibilityData": {
          "label": "E"
        }
      },
      "timestampText": {
        "simpleText": "0:43"
      }
    };
    const { lcRendererElm, visObserver } = (() => {
      let lcRendererWR = null;
      const lcRendererElm = () => {
        let lcRenderer = kRef(lcRendererWR);
        if (!lcRenderer || !lcRenderer.isConnected) {
          lcRenderer = document.querySelector('yt-live-chat-item-list-renderer.yt-live-chat-renderer');
          lcRendererWR = lcRenderer ? mWeakRef(lcRenderer) : null;
        }
        return lcRenderer;
      };
      let hasFirstShowMore = false;
      const visObserverFn = (entry) => {
        const target = entry.target;
        if (!target) return;
        // if(target.classList.contains('dont-render')) return;
        let isVisible = entry.isIntersecting === true && entry.intersectionRatio > 0.5;
        // const h = entry.boundingClientRect.height;
        /*
        if (h < 16) { // wrong: 8 (padding/margin); standard: 32; test: 16 or 20
            // e.g. under fullscreen. the element created but not rendered.
            target.setAttribute('wSr93', '');
            return;
        }
        */
        if (isVisible) {
          // target.style.setProperty('--wsr94', h + 'px');
          target.setAttribute('wSr93', 'visible');
          if (nNextElem(target) === null) {
            // firstVisibleItemDetected = true;
            /*
              if (dateNow() - lastScroll < 80) {
                  lastLShow = 0;
                  lastScroll = 0;
                  Promise.resolve().then(clickShowMore);
              } else {
                  lastLShow = dateNow();
              }
              */
            // lastLShow = dateNow();
          } else if (!hasFirstShowMore) { // should more than one item being visible
            // implement inside visObserver to ensure there is sufficient delay
            hasFirstShowMore = true;
            requestAnimationFrame(() => {
              // foreground page
              // page visibly ready -> load the latest comments at initial loading
              const lcRenderer = lcRendererElm();
              if (lcRenderer) {
                if (typeof window.nextBrowserTick !== 'function') {
                  insp(lcRenderer).scrollToBottom_();
                } else {
                  nextBrowserTick(() => {
                    const cnt = insp(lcRenderer);
                    if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
                    cnt.scrollToBottom_();
                  });
                }
              }
            });
          }
        }
        else if (target.getAttribute('wSr93') === 'visible') { // ignore target.getAttribute('wSr93') === '' to avoid wrong sizing
          // target.style.setProperty('--wsr94', h + 'px');
          target.setAttribute('wSr93', 'hidden');
        } // note: might consider 0 < entry.intersectionRatio < 0.5 and target.getAttribute('wSr93') === '' <new last item>
      }
      const visObserver = new IntersectionObserver((entries) => {
        for (const entry of entries) {
          Promise.resolve(entry).then(visObserverFn);
        }
      }, {
        // root: HTMLElement.prototype.closest.call(m2, '#item-scroller.yt-live-chat-item-list-renderer'), // nullable
        rootMargin: "0px",
        threshold: [0.05, 0.95],
      });
      return { lcRendererElm, visObserver }
    })();
    const { setupMutObserver } = (() => {
      async function asyncTickerBackgroundOverridedChecker() {
        try {
          await promiseForCustomYtElementsReady.then();
          await customElements.whenDefined('yt-live-chat-text-message-renderer');
          await new Promise(r => setTimeout(r, 800));
          if (!hasTimerModified) return;
          const tickerRenderer = document.querySelector('#ticker yt-live-chat-ticker-renderer.style-scope.yt-live-chat-renderer');
          if (!tickerRenderer) return;
          const tickerRendererDollar = indr(tickerRenderer);
          const items = (tickerRendererDollar || 0).items || 0;
          if (!items) return;
          const template = document.createElement('template');
          template.innerHTML = `<yt-live-chat-ticker-dummy777-item-renderer class="style-scope yt-live-chat-ticker-renderer" whole-message-clickable=""
            modern="" aria-label="¥1,000" role="button" tabindex="0" id="Chw777" style="width: 94px; overflow: hidden;"
            dimmed="" [dummy777]>
            <div id="container" dir="ltr" class="style-scope yt-live-chat-ticker-dummy777-item-renderer"
              style="--background:linear-gradient(90deg, rgba(1,2,3,1),rgba(1,2,3,1) 7%,rgba(4,0,0,1) 7%,rgba(4,0,0,1));">
              <div id="content" class="style-scope yt-live-chat-ticker-dummy777-item-renderer" style="color: rgb(255, 255, 255);">
                <yt-img-shadow777 id="author-photo" height="24" width="24"
                  class="style-scope yt-live-chat-ticker-dummy777-item-renderer no-transition"
                  style="background-color: transparent;" loaded=""><img id="img"
                    draggable="false" class="style-scope yt-img-shadow" alt="I" height="24" width="24"
                    src="${dummyImgURL}"></yt-img-shadow777>
                <span id="text" dir="ltr" class="style-scope yt-live-chat-ticker-dummy777-item-renderer">¥1,000</span>
              </div>
            </div>
          </yt-live-chat-ticker-dummy777-item-renderer>`;
          const dummy777 = template.content.firstElementChild;
          await Promise.resolve().then();
          let res = 0;
          if (items instanceof HTMLElement && items.isConnected === true) {
            try {
              items.appendChild(dummy777);
              let container = HTMLElement.prototype.querySelector.call(dummy777, '#container') || 0;
              if (container.isConnected === true) {
                const evaluated = `${getComputedStyleCached(container).background}`;
                container = null;
                res = evaluated.indexOf('0.') < 4 ? 1 : 2;
              }
            } catch (e) { console.warn(e) }
            HTMLElement.prototype.remove.call(dummy777);
          }
          await Promise.resolve().then();
          dummy777.textContent = '';
          if (res === 1) {
            // not fulfilling
            // rgba(0, 0, 0, 0.004) none repeat scroll 0% 0% / auto padding-box border-box
            console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | Incompatibility Found"}`,
              "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
              "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
            );
            console.warn(`%cWarning:\n\tYou might have added a userscript or extension that also modifies the ticker background.\n\tYouTube Super Fast Chat is taking over.`, 'color: #bada55');
            console.groupEnd();
            console.log('%cALLOW_ADVANCED_ANIMATED_TICKER_BACKGROUND (Overriding other scripting)', 'background-color: #7eb32b; color: #102624; padding: 2px 4px');
          } else if (res === 2) {
            console.log('%cALLOW_ADVANCED_ANIMATED_TICKER_BACKGROUND', 'background-color: #16c450; color: #102624; padding: 2px 4px');
          }
        } catch (e) {
          console.warn(e);
        }
      }
      async function asyncDelayChatOccurrence(m2) {
        try {
          await promiseForCustomYtElementsReady.then();
          await customElements.whenDefined('yt-live-chat-text-message-renderer');
          await new Promise(r => setTimeout(r, 1));
          const dummy888 = document.createElement('yt-live-chat-text-message-renderer');
          // const template = document.createElement('template');
          // template.innerHTML = "<yt-live-chat-text-message-renderer></yt-live-chat-text-message-renderer>"
          // const dummy888 = template.content.firstElementChild;
          const skzCnt = insp(dummy888);
          if (!(skzCnt && 'data' in skzCnt && 'attached' in skzCnt)) {
            return;
          }
          if (!skzCnt.hostElement) skzCnt.hostElement = dummy888;
          /** @type {HTMLTemplateElement} */
          const skzElem = dummy888;
          let cz1 = null;
          const deferredZy1 = new Promise(resolve => {
            skzCnt.attached = function () {
              cz1 = HTMLElement.prototype.querySelector.call(skzElem, '#message img') !== null;
              resolve(skzElem.textContent);
            }
            skzCnt.detached = function () {
            }
          });
          skzElem.id = 'sk35z';
          skzData(skzCnt);
          sk35zResolveFn = null;
          const deferredMutation = new Promise(resolve => {
            sk35zResolveFn = resolve;
            HTMLElement.prototype.appendChild.call(m2, skzElem);
          });
          const [zy1, _] = await Promise.all([deferredZy1, deferredMutation]);
          skzCnt.attached = function () { };
          function fn() {
            const zy2 = skzElem.textContent;
            const cz2 = HTMLElement.prototype.querySelector.call(skzElem, '#message img') !== null;
            if (typeof zy1 === 'string' && typeof zy2 === 'string') {
              allowDontRender = zy1 === zy2 && cz1 === cz2; // '0:43Nem2oji'
            }
            if (allowDontRender === true) return true;
            if (allowDontRender === false) {
              console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | Incompatibility Found"}`,
                "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
                "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
              );
              console.warn(`%cWarning:\n\tYou might have added a userscript or extension that stops YouTube Super Fast Chat's quick loading.\n\tTo figure out which one affects the script, turn them off one by one and let the author know.`, 'color: #bada55');
              console.groupEnd();
            }
          }
          await new Promise(r => setTimeout(r, 1));
          if (!fn()) return;
          await new Promise(r => requestAnimationFrame(r));
          if (!fn()) return;
          skzElem.remove();
          await Promise.resolve().then();
          skzElem.textContent = '';
          console.log('%cALLOW_DELAYED_CHAT_OCCURRENCE', 'background-color: #16c450; color: #102624; padding: 2px 4px');
        } catch (e) {
          console.warn(e);
        }
      }
      const mutFn = (items) => {
        let seqIndex = -1;
        const elementSet = new Set();
        for (let node = nLastElem(items); node !== null; node = nPrevElem(node)) {
          if (node.hasAttribute('wSr93')) {
            seqIndex = parseInt(node.getAttribute('yt-chat-item-seq'), 10);
            break;
          }
          node.setAttribute('wSr93', '');
          visObserver.observe(node);
          elementSet.add(node);
        }
        let iter = elementSet.values();
        let i = seqIndex + elementSet.size;
        for (let curr; curr = iter.next().value;) {
          curr.setAttribute('yt-chat-item-seq', i % 60);
          curr.classList.add('yt-chat-item-' + ((i % 2) ? 'odd' : 'even'));
          i--;
        }
        iter = null;
        elementSet.clear();
      }
      const mutObserver = new MutationObserver((mutations) => {
        const items = (mutations[0] || 0).target;
        if (!items) return;
        if (sk35zResolveFn) {
          sk35zResolveFn();
          sk35zResolveFn = null;
        }
        mutFn(items);
      });
      const setupMutObserver = (m2) => {
        scrollChatFn = null;
        mutObserver.disconnect();
        mutObserver.takeRecords();
        if (m2) {
          ENABLE_DELAYED_CHAT_OCCURRENCE && bnForDelayChatOccurrence();
          if (typeof m2.__appendChild932__ === 'function') {
            if (typeof m2.appendChild === 'function') m2.appendChild = m2.__appendChild932__;
            if (typeof m2.__shady_native_appendChild === 'function') m2.__shady_native_appendChild = m2.__appendChild932__;
          }
          mutObserver.observe(m2, {
            childList: true,
            subtree: false
          });
          mutFn(m2);
          const isFirstList = firstList;
          firstList = false;
          if (ENABLE_OVERFLOW_ANCHOR) {
            let items = m2;
            let addedAnchor = false;
            if (items) {
              if (items.nextElementSibling === null) {
                items.classList.add('no-anchor');
                addedAnchor = true;
                items.parentNode.appendChild(dr(document.createElement('item-anchor')));
              }
            }
            if (addedAnchor) {
              nodeParent(m2).classList.add('no-anchor'); // required
            }
          }
          // let div = document.createElement('div');
          // div.id = 'qwcc';
          // HTMLElement.prototype.appendChild.call(document.querySelector('yt-live-chat-item-list-renderer'), div )
          // bufferRegion =div;
          // buffObserver.takeRecords();
          // buffObserver.disconnect();
          // buffObserver.observe(div,  {
          //     childList: true,
          //     subtree: false
          // })
          if (ENABLE_DELAYED_CHAT_OCCURRENCE && isFirstList) {
            asyncDelayChatOccurrence(m2);
          }
          if (ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX) {
            (() => {
              const tag = 'yt-iframed-player-events-relay'
              const dummy = document.createElement(tag);
              const cProto = getProto(dummy);
              if (!cProto || !cProto.handlePostMessage_) {
                console.warn(`proto.handlePostMessage_ for ${tag} is unavailable.`);
                return;
              }
              if (typeof cProto.handlePostMessage_ === 'function' && !cProto.handlePostMessage66_) {
                cProto.handlePostMessage66_ = cProto.handlePostMessage_;
                cProto.handlePostMessage67_ = function (a) {
                  const da = a.data;
                  playEventsStack = playEventsStack.then(() => {
                    if ('yt-player-state-change' in da) {
                      const qc = da['yt-player-state-change'];
                      let isQcChanged = false;
                      if (qc === 2) { isQcChanged = qc !== _playerState; _playerState = 2; relayCount = 0; } // paused
                      else if (qc === 3) { isQcChanged = qc !== _playerState; _playerState = 3; } // playing
                      else if (qc === 1) { isQcChanged = qc !== _playerState; _playerState = 1; } // playing
                      if ((isQcChanged) && playerState !== _playerState) {
                        playerEventsByIframeRelay = true;
                        onPlayStateChangePromise = new Promise((resolve) => {
                          let k = _playerState;
                          foregroundPromiseFn().then(() => {
                            if (k === _playerState && playerState !== _playerState) playerState = _playerState;
                            onPlayStateChangePromise = null;
                            resolve();
                          })
                        }).catch(console.warn);
                      }
                    } else if ('yt-player-video-progress' in da) {
                      const vp = da['yt-player-video-progress'];
                      relayCount++;
                      lastPlayerProgress = vp > 0 ? vp : 0;
                      if (relayPromise && vp > 0 && relayCount >= 2) {
                        if (onPlayStateChangePromise) {
                          onPlayStateChangePromise.then(() => {
                            relayPromise && relayPromise.resolve();
                            relayPromise = null;
                          })
                        } else {
                          relayPromise.resolve();
                          relayPromise = null;
                        }
                      }
                    }
                    return this.handlePostMessage66_(a);
                  }).catch(console.warn);
                }
                cProto.handlePostMessage_ = function (a) {
                  const da = (a || 0).data || 0;
                  if (typeof da !== 'object') return;
                  if (waitForInitialDataCompletion === 1) return;
                  if (!isPlayProgressTriggered) {
                    isPlayProgressTriggered = true;
                    if ('yt-player-video-progress' in da) {
                      waitForInitialDataCompletion = 1;
                      const wrapWith = (data) => {
                        const { origin } = a;
                        return {
                          origin,
                          data
                        };
                      }
                      this.handlePostMessage67_(wrapWith({
                        "yt-iframed-parent-ready": true
                      }));
                      playEventsStack = playEventsStack.then(() => {
                        const lcr = document.querySelector('yt-live-chat-renderer');
                        const psc = document.querySelector("yt-player-seek-continuation");
                        if (lcr && psc && lcr.replayBuffer_) {
                          const rbProgress = lcr.replayBuffer_.lastVideoOffsetTimeMsec;
                          const daProgress = da['yt-player-video-progress'] * 1000
                          // document.querySelector('yt-live-chat-renderer').playerProgressChanged_(1e-5);
                          const front_ = (lcr.replayBuffer_.replayQueue || 0).front_;
                          const back_ = (lcr.replayBuffer_.replayQueue || 0).back_;
                          // console.log(deepCopy( front_))
                          // console.log(deepCopy( back_))
                          // console.log(rbProgress, daProgress, )
                          if (front_ && back_ && rbProgress > daProgress && back_.length > 2 && back_.some(e => e && +e.videoOffsetTimeMsec > daProgress) && back_.some(e => e && +e.videoOffsetTimeMsec < daProgress)) {
                            // no action
                            // console.log('ss1')
                          } else if (rbProgress < daProgress + 3400 && rbProgress > daProgress - 1200) {
                            //  daProgress - 1200 < rbProgress < daProgress + 3400
                            // console.log('ss2')
                          } else {
                            // console.log('ss3')
                            // lcr.replayBuffer_.replayQueue.back_.length= 0;
                            // lcr.replayBuffer_.replayQueue.front_.length= 0;
                            // lcr
                            lcr.previousProgressSec = 1E-5;
                            // lcr._setIsSeeking(!0),
                            lcr.replayBuffer_.clear()
                            psc.fireSeekContinuation_(da['yt-player-video-progress']);
                          }
                        }
                        waitForInitialDataCompletion = 2;
                        this.handlePostMessage_(a);
                      }).catch(console.warn);
                      return;
                    }
                  }
                  this.handlePostMessage67_(a);
                }
              }
            })();
          }
          if (isFirstList && DO_CHECK_TICKER_BACKGROUND_OVERRIDED) {
            asyncTickerBackgroundOverridedChecker();
          }
        }
      }
      return { setupMutObserver };
    })();
    const setupEvents = () => {
      let scrollCount = 0;
      const passiveCapture = typeof IntersectionObserver === 'function' ? { capture: true, passive: true } : true;
      const delayFlushActiveItemsAfterUserActionK_ = () => {
        const lcRenderer = lcRendererElm();
        if (lcRenderer) {
          const cnt = insp(lcRenderer);
          if (!cnt.hasUserJustInteracted11_) return;
          if (cnt.atBottom && cnt.allowScroll && cnt.activeItems_.length >= 1 && cnt.hasUserJustInteracted11_()) {
            cnt.delayFlushActiveItemsAfterUserAction11_ && cnt.delayFlushActiveItemsAfterUserAction11_();
          }
        }
      }
      document.addEventListener('scroll', (evt) => {
        if (!evt || !evt.isTrusted) return;
        // lastScroll = dateNow();
        if (++scrollCount > 1e9) scrollCount = 9;
      }, passiveCapture); // support contain => support passive
      let lastScrollCount = -1;
      document.addEventListener('wheel', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (lastScrollCount === scrollCount) return;
        lastScrollCount = scrollCount;
        lastWheel = dateNow();
        delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
      }, passiveCapture); // support contain => support passive
      document.addEventListener('mousedown', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (((evt || 0).target || 0).id !== 'item-scroller') return;
        lastMouseDown = dateNow();
        currentMouseDown = true;
        lastUserInteraction = lastMouseDown;
      }, passiveCapture);
      document.addEventListener('pointerdown', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (((evt || 0).target || 0).id !== 'item-scroller') return;
        lastMouseDown = dateNow();
        currentMouseDown = true;
        lastUserInteraction = lastMouseDown;
      }, passiveCapture);
      document.addEventListener('click', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (((evt || 0).target || 0).id !== 'item-scroller') return;
        lastMouseDown = lastMouseUp = dateNow();
        currentMouseDown = false;
        lastUserInteraction = lastMouseDown;
        delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
      }, passiveCapture);
      document.addEventListener('tap', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (((evt || 0).target || 0).id !== 'item-scroller') return;
        lastMouseDown = lastMouseUp = dateNow();
        currentMouseDown = false;
        lastUserInteraction = lastMouseDown;
        delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
      }, passiveCapture);
      document.addEventListener('mouseup', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (currentMouseDown) {
          lastMouseUp = dateNow();
          currentMouseDown = false;
          lastUserInteraction = lastMouseUp;
          delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
        }
      }, passiveCapture);
      document.addEventListener('pointerup', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (currentMouseDown) {
          lastMouseUp = dateNow();
          currentMouseDown = false;
          lastUserInteraction = lastMouseUp;
          delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
        }
      }, passiveCapture);
      document.addEventListener('touchstart', (evt) => {
        if (!evt || !evt.isTrusted) return;
        lastTouchDown = dateNow();
        currentTouchDown = true;
        lastUserInteraction = lastTouchDown;
      }, passiveCapture);
      document.addEventListener('touchmove', (evt) => {
        if (!evt || !evt.isTrusted) return;
        lastTouchDown = dateNow();
        currentTouchDown = true;
        lastUserInteraction = lastTouchDown;
      }, passiveCapture);
      document.addEventListener('touchend', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (currentTouchDown) {
          lastTouchUp = dateNow();
          currentTouchDown = false;
          lastUserInteraction = lastTouchUp;
          delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
        }
      }, passiveCapture);
      document.addEventListener('touchcancel', (evt) => {
        if (!evt || !evt.isTrusted) return;
        if (currentTouchDown) {
          lastTouchUp = dateNow();
          currentTouchDown = false;
          lastUserInteraction = lastTouchUp;
          delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
        }
      }, passiveCapture);
    }
    const getTimestampUsec = (itemRenderer) => {
      if (itemRenderer && 'timestampUsec' in itemRenderer) {
        return itemRenderer.timestampUsec
      } else if (itemRenderer && itemRenderer.showItemEndpoint) {
        const messageRenderer = ((itemRenderer.showItemEndpoint.showLiveChatItemEndpoint || 0).renderer || 0);
        if (messageRenderer) {
          const messageRendererKey = firstObjectKey(messageRenderer);
          if (messageRendererKey && messageRenderer[messageRendererKey]) {
            const messageRendererData = messageRenderer[messageRendererKey];
            if (messageRendererData && 'timestampUsec' in messageRendererData) {
              return messageRendererData.timestampUsec
            }
          }
        }
      }
      return null;
    }
    const onRegistryReadyForDOMOperations = () => {
      let firstCheckedOnYtInit = false;
      const assertorURL = () => assertor(() => location.pathname.startsWith('/live_chat') && (location.search.indexOf('continuation=') > 0 || location.search.indexOf('v=') > 0));
      const mightFirstCheckOnYtInit = () => {
        if (firstCheckedOnYtInit) return;
        firstCheckedOnYtInit = true;
        if (!document.body || !document.head) return;
        if (!assertorURL()) return;
        addCssManaged();
        let efsContainer = document.getElementById('elzm-fonts-yk75g');
        if (efsContainer && efsContainer.parentNode !== document.body) {
          document.body.appendChild(efsContainer);
        }
      };
      if (!assertorURL()) return;
      // if (!assertor(() => document.getElementById('yt-masthead') === null)) return;
      if (document.documentElement && document.head) {
        addCssManaged();
      }
      // console.log(document.body===null)
      if (ATTEMPT_TICKER_ANIMATION_START_TIME_DETECTION) {
        getLCRDummy().then(async (lcrDummy) => {
          const tag = "yt-live-chat-renderer"
          const dummy = lcrDummy;
          const cProto = getProto(dummy);
          if (!cProto || !cProto.attached) {
            console.warn(`proto.attached for ${tag} is unavailable.`);
            return;
          }
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-renderer hacks");
          console.log("[Begin]");
          if (typeof cProto.playerProgressChanged_ === 'function' && !cProto.playerProgressChanged32_) {
            cProto.playerProgressChanged32_ = cProto.playerProgressChanged_;
            const pop078 = function () {
              const r = this.pop78();
              if (r && (r.actions || 0).length >= 1 && r.videoOffsetTimeMsec) {
                for (const action of r.actions) {
                  const itemActionKey = !action ? null : 'addChatItemAction' in action ? 'addChatItemAction' : 'addLiveChatTickerItemAction' in action ? 'addLiveChatTickerItemAction' : null;
                  if (itemActionKey) {
                    const itemAction = action[itemActionKey];
                    const item = (itemAction || 0).item;
                    if (typeof item === 'object') {
                      const rendererKey = firstObjectKey(item);
                      if (rendererKey) {
                        const renderer = item[rendererKey];
                        if (renderer && typeof renderer === 'object') {
                          renderer.__videoOffsetTimeMsec__ = r.videoOffsetTimeMsec;
                          renderer.__progressAt__ = playerProgressChangedArg1;
                        }
                      }
                    }
                  }
                }
              }
              return r;
            }
            cProto.playerProgressChanged_ = function (a, b, c) {
              playerProgressChangedArg1 = a;
              playerProgressChangedArg2 = b;
              playerProgressChangedArg3 = c;
              const replayBuffer_ = this.replayBuffer_;
              if (replayBuffer_) {
                const replayQueue = replayBuffer_.replayQueue
                if (replayQueue && typeof replayQueue === 'object' && !replayQueue.qe3) {
                  replayBuffer_.replayQueue = new Proxy(replayBuffer_.replayQueue, {
                    get(target, prop, receiver) {
                      if (prop === 'qe3') return 1;
                      const v = target[prop];
                      if (prop === 'front_') {
                        if (v && typeof v.length === 'number') {
                          if (!v.pop78) {
                            v.pop78 = v.pop;
                            v.pop = pop078;
                          }
                        }
                      }
                      return v;
                    }
                  });
                }
              }
              return this.playerProgressChanged32_.apply(this, arguments);
            };
          }
          // if (typeof cProto.immediatelyApplyLiveChatActions === 'function' && !cProto.immediatelyApplyLiveChatActions32) {
          //   cProto.immediatelyApplyLiveChatActions32 = cProto.immediatelyApplyLiveChatActions;
          //   cProto.immediatelyApplyLiveChatActions = function (a) {
          //     // if (a.length > 8) {
          //     //   console.log(a)
          //     // }
          //     // console.log(a)
          //     /*
          //     let arr=a.slice();
          //     if(arr.length >= 2){
          //       arr.sort((a, b)=>{
          //         let ak = firstObjectKey(a);
          //         let bk = firstObjectKey(b);
          //         if(!ak||!bk) return 0;
          //         const ax = +a[ak]._timestampUsec57;
          //         const bx = +b[bk]._timestampUsec57;
          //         if(ax >0 && bx >0){
          //           const c =  bx - ax ;
          //           return c > 0.1 ? -1 : c< -0.1 ? 1 : 0;
          //         }
          //         return 0;
          //       });
          //       console.log('sort', JSON.parse(JSON.stringify(arr)));
          //     }
          //     a=arr;
          //     */
          //     if (a && typeof a === 'object' && a.length >= 1) {
          //       const d = Date.now();
          //       const m = [];
          //       for (let i = 0, l = a.length; i < l; i++) {
          //         const action = a[i];
          //         const key = !action ? null : 'addChatItemAction' in action ? 'addChatItemAction' : 'addLiveChatTickerItemAction' in action ? 'addLiveChatTickerItemAction' : null;
          //         if (key === 'addChatItemAction' || key === 'addLiveChatTickerItemAction') {
          //           const itemAction = action[key] || 0;
          //           const item = itemAction.item || 0;
          //           if (item && typeof item === 'object') {
          //             let rendererKey = firstObjectKey(item);
          //             const renderer = item[rendererKey];
          //             let timestampUsec = getTimestampUsec(renderer);
          //             if (timestampUsec !== null) {
          //               renderer._timestampUsec57 = timestampUsec;
          //             }
          //             m.push(renderer);
          //             // if(timestampUsec!==null){
          //             //   if(key==='addLiveChatTickerItemAction')console.log(renderer, rendererKey, key)
          //             //   m.push(renderer);
          //             // }
          //           }
          //         }
          //       }
          //       if (m.length >= 1) {
          //         let lastUsec = null;
          //         for (let i = 0, l = m.length; i < l; i++) {
          //           const renderer = m[i];
          //           if ('_timestampUsec57' in renderer) {
          //             lastUsec = +renderer._timestampUsec57 / 1E3;
          //             renderer.__lcrTime__ = d;
          //             renderer.__actionAt__ = d;
          //           }
          //         }
          //         if (lastUsec !== null) {
          //           const refUsec = lastUsec
          //           let prevUsec = null;
          //           for (let i = 0, l = m.length; i < l; i++) {
          //             const renderer = m[i];
          //             if ('_timestampUsec57' in renderer) {
          //               let actualTime = +renderer._timestampUsec57 / 1E3; // ms
          //               let lcrTime = d - Math.round(refUsec - actualTime); // ms
          //               renderer.__lcrTime__ = lcrTime; // ms
          //               renderer.__actionAt__ = d;
          //               prevUsec = lcrTime
          //             } else {
          //               renderer._prevUsec57 = prevUsec;
          //             }
          //           }
          //           let nextUsec = null;
          //           for (let i = m.length - 1; i >= 0; i--) {
          //             const renderer = m[i];
          //             if ('_timestampUsec57' in renderer) {
          //               nextUsec = renderer.__lcrTime__
          //             } else {
          //               renderer._nextUsec57 = nextUsec;
          //               if (renderer._nextUsec57 > 0 && renderer._prevUsec57 > 0 && renderer._nextUsec57 > renderer._prevUsec57) {
          //                 renderer.__lcrTime__ = (renderer._nextUsec57 + renderer._prevUsec57) / 2;
          //                 renderer.__actionAt__ = d;
          //               }
          //             }
          //           }
          //         }
          //       }
          //     }
          //     return this.immediatelyApplyLiveChatActions32.apply(this, arguments)
          //   }
          // }
          console.log("[End]");
          console.groupEnd();
        });
      }
      customElements.whenDefined('yt-live-chat-item-list-renderer').then(() => {
        const tag = "yt-live-chat-item-list-renderer"
        const dummy = document.createElement(tag);
        const cProto = getProto(dummy);
        if (!cProto || !cProto.attached) {
          console.warn(`proto.attached for ${tag} is unavailable.`);
          return;
        }
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-item-list-renderer hacks");
        console.log("[Begin]");
        const mclp = cProto;
        try {
          assertor(() => typeof mclp.scrollToBottom_ === 'function');
          assertor(() => typeof mclp.flushActiveItems_ === 'function');
          assertor(() => typeof mclp.canScrollToBottom_ === 'function');
          assertor(() => typeof mclp.setAtBottom === 'function');
          assertor(() => typeof mclp.scrollToBottom66_ === 'undefined');
          assertor(() => typeof mclp.flushActiveItems66_ === 'undefined');
        } catch (e) { }
        try {
          assertor(() => typeof mclp.attached === 'function');
          assertor(() => typeof mclp.detached === 'function');
          assertor(() => typeof mclp.canScrollToBottom_ === 'function');
          assertor(() => typeof mclp.isSmoothScrollEnabled_ === 'function');
          assertor(() => typeof mclp.maybeResizeScrollContainer_ === 'function');
          assertor(() => typeof mclp.refreshOffsetContainerHeight_ === 'function');
          assertor(() => typeof mclp.smoothScroll_ === 'function');
          assertor(() => typeof mclp.resetSmoothScroll_ === 'function');
        } catch (e) { }
        mclp.__intermediate_delay__ = null;
        let mzk = 0;
        let myk = 0;
        let mlf = 0;
        let myw = 0;
        let mzt = 0;
        let zarr = null;
        let mlg = 0;
        if ((mclp.clearList || 0).length === 0) {
          assertor(() => fnIntegrity(mclp.clearList, '0.106.50'));
          mclp.clearList66 = mclp.clearList;
          mclp.clearList = function () {
            mzk++;
            myk++;
            mlf++;
            myw++;
            mzt++;
            mlg++;
            zarr = null;
            this.__intermediate_delay__ = null;
            this.clearList66();
          };
          console.log("clearList", "OK");
        } else {
          console.log("clearList", "NG");
        }
        let onListRendererAttachedDone = false;
        function setList(itemOffset, items) {
          const isFirstTime = onListRendererAttachedDone === false;
          if (isFirstTime) {
            onListRendererAttachedDone = true;
            Promise.resolve().then(watchUserCSS);
            addCssManaged();
            setupEvents();
          }
          setupStyle(itemOffset, items);
          setupMutObserver(items);
        }
        mclp.attached419 = async function () {
          if (!this.isAttached) return;
          let maxTrial = 16;
          while (!this.$ || !this.$['item-scroller'] || !this.$['item-offset'] || !this.$['items']) {
            if (--maxTrial < 0 || !this.isAttached) return;
            await new Promise(requestAnimationFrame);
          }
          if (this.isAttached !== true) return;
          if (!this.$) {
            console.warn("!this.$");
            return;
          }
          if (!this.$) return;
          /** @type {HTMLElement | null} */
          const itemScroller = this.$['item-scroller'];
          /** @type {HTMLElement | null} */
          const itemOffset = this.$['item-offset'];
          /** @type {HTMLElement | null} */
          const items = this.$['items'];
          if (!itemScroller || !itemOffset || !items) {
            console.warn("items.parentNode !== itemOffset");
            return;
          }
          if (nodeParent(items) !== itemOffset) {
            console.warn("items.parentNode !== itemOffset");
            return;
          }
          if (items.id !== 'items' || itemOffset.id !== "item-offset") {
            console.warn("id incorrect");
            return;
          }
          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')
          if (!isTargetItems) {
            console.warn("!isTargetItems");
            return;
          }
          setList(itemOffset, items);
        }
        mclp.attached331 = mclp.attached;
        mclp.attached = function () {
          this.attached419 && this.attached419();
          return this.attached331();
        }
        mclp.detached331 = mclp.detached;
        mclp.detached = function () {
          setupMutObserver();
          return this.detached331();
        }
        const t29s = document.querySelectorAll("yt-live-chat-item-list-renderer");
        for (const t29 of t29s) {
          if (insp(t29).isAttached === true) {
            t29.attached419();
          }
        }
        if ((mclp.async || 0).length === 2 && (mclp.cancelAsync || 0).length === 1) {
          assertor(() => fnIntegrity(mclp.async, '2.24.15'));
          assertor(() => fnIntegrity(mclp.cancelAsync, '1.15.8'));
          /** @type {Map<number, any>} */
          const aMap = new Map();
          let count = 6150;
          mclp.async66 = mclp.async;
          mclp.async = function (e, f) {
            // ensure the previous operation is done
            // .async is usually after the time consuming functions like flushActiveItems_ and scrollToBottom_
            const hasF = arguments.length === 2;
            const stack = new Error().stack;
            const isFlushAsync = stack.indexOf('flushActiveItems_') >= 0;
            if (count > 1e9) count = 6159;
            const resId = ++count;
            aMap.set(resId, e);
            (this.__intermediate_delay__ || Promise.resolve()).then(rk => {
              const rp = aMap.get(resId);
              if (typeof rp !== 'function') {
                return;
              }
              let cancelCall = false;
              if (isFlushAsync) {
                if (rk < 0) {
                  cancelCall = true;
                } else if (rk === 2 && arguments[0] === this.maybeScrollToBottom_) {
                  cancelCall = true;
                }
              }
              if (cancelCall) {
                aMap.delete(resId);
              } else {
                const asyncEn = function () {
                  aMap.delete(resId);
                  return rp.apply(this, arguments);
                };
                aMap.set(resId, hasF ? this.async66(asyncEn, f) : this.async66(asyncEn));
              }
            });
            return resId;
          }
          mclp.cancelAsync66 = mclp.cancelAsync;
          mclp.cancelAsync = function (resId) {
            if (resId <= 6150) {
              this.cancelAsync66(resId);
            } else if (aMap.has(resId)) {
              const rp = aMap.get(resId);
              aMap.delete(resId);
              if (typeof rp !== 'function') {
                this.cancelAsync66(rp);
              }
            }
          }
          console.log("async", "OK");
        } else {
          console.log("async", "NG");
        }
        if ((mclp.showNewItems_ || 0).length === 0 && ENABLE_NO_SMOOTH_TRANSFORM) {
          assertor(() => fnIntegrity(mclp.showNewItems_, '0.170.79'));
          mclp.showNewItems66_ = mclp.showNewItems_;
          mclp.showNewItems77_ = async function () {
            if (myk > 1e9) myk = 9;
            let tid = ++myk;
            await new Promise(requestAnimationFrame);
            if (tid !== myk) {
              return;
            }
            const cnt = this;
            await Promise.resolve();
            cnt.showNewItems66_();
            await Promise.resolve();
          }
          mclp.showNewItems_ = function () {
            const cnt = this;
            cnt.__intermediate_delay__ = new Promise(resolve => {
              cnt.showNewItems77_().then(() => {
                resolve();
              });
            });
          }
          console.log("showNewItems_", "OK");
        } else {
          console.log("showNewItems_", "NG");
        }
        if ((mclp.flushActiveItems_ || 0).length === 0) {
          const sfi = fnIntegrity(mclp.flushActiveItems_);
          if (sfi === '0.156.86') {
            // https://www.youtube.com/s/desktop/f61c8d85/jsbin/live_chat_polymer.vflset/live_chat_polymer.js
            // added "refreshOffsetContainerHeight_"
            //   f.flushActiveItems_ = function() {
            //     var a = this;
            //     if (0 < this.activeItems_.length)
            //         if (this.canScrollToBottom_()) {
            //             var b = Math.max(this.visibleItems.length + this.activeItems_.length - this.data.maxItemsToDisplay, 0);
            //             b && this.splice("visibleItems", 0, b);
            //             if (this.isSmoothScrollEnabled_() || this.dockableMessages.length)
            //                 this.preinsertHeight_ = this.items.clientHeight;
            //             this.activeItems_.unshift("visibleItems");
            //             try {
            //                 this.push.apply(this, this.activeItems_)
            //             } catch (c) {
            //                 fm(c)
            //             }
            //             this.activeItems_ = [];
            //             this.isSmoothScrollEnabled_() ? this.canScrollToBottom_() && Mw(function() {
            //                 a.showNewItems_()
            //             }) : Mw(function() {
            //                 a.refreshOffsetContainerHeight_();
            //                 a.maybeScrollToBottom_()
            //             })
            //         } else
            //             this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay)
            // }
            // ;
          } else if (sfi === '0.150.84') {
            // https://www.youtube.com/s/desktop/e4d15d2c/jsbin/live_chat_polymer.vflset/live_chat_polymer.js
            // var b = Math.max(this.visibleItems.length + this.activeItems_.length - this.data.maxItemsToDisplay, 0);
            //     b && this.splice("visibleItems", 0, b);
            //     if (this.isSmoothScrollEnabled_() || this.dockableMessages.length)
            //         this.preinsertHeight_ = this.items.clientHeight;
            //     this.activeItems_.unshift("visibleItems");
            //     try {
            //         this.push.apply(this, this.activeItems_)
            //     } catch (c) {
            //         nm(c)
            //     }
            //     this.activeItems_ = [];
            //     this.isSmoothScrollEnabled_() ? this.canScrollToBottom_() && zQ(function() {
            //         a.showNewItems_()
            //     }) : zQ(function() {
            //         a.maybeScrollToBottom_()
            //     })
          } else if (sfi === '0.137.81' || sfi === '0.138.81') {
            // e.g. https://www.youtube.com/yts/jsbin/live_chat_polymer-vflCyWEBP/live_chat_polymer.js
          } else {
            assertor(() => fnIntegrity(mclp.flushActiveItems_, '0.150.84'));
          }
          let hasMoreMessageState = !ENABLE_SHOW_MORE_BLINKER ? -1 : 0;
          let contensWillChangeController = null;
          mclp.flushActiveItems66_ = mclp.flushActiveItems_;
          mclp.flushActiveItems78_ = async function (tid) {
            try {
              if (tid !== mlf) return;
              const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
              let logger = false;
              const cnt = this;
              let immd = cnt.__intermediate_delay__;
              await new Promise(requestAnimationFrame);
              if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
              if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
              mlf++;
              if (mlg > 1e9) mlg = 9;
              ++mlg;
              const tmpMaxItemsCount = this.data.maxItemsToDisplay;
              const reducedMaxItemsToDisplay = MAX_ITEMS_FOR_FULL_FLUSH;
              let changeMaxItemsToDisplay = false;
              const activeItemsLen = this.activeItems_.length;
              if (activeItemsLen > tmpMaxItemsCount && tmpMaxItemsCount > 0) {
                logger = true;
                groupCollapsed("YouTube Super Fast Chat", " | flushActiveItems78_");
                logger && console.log('[Begin]')
                console.log('this.activeItems_.length > N', activeItemsLen, tmpMaxItemsCount);
                if (ENABLE_REDUCED_MAXITEMS_FOR_FLUSH && lockedMaxItemsToDisplay === tmpMaxItemsCount && lockedMaxItemsToDisplay !== reducedMaxItemsToDisplay) {
                  console.log('reduce maxitems');
                  if (tmpMaxItemsCount > reducedMaxItemsToDisplay) {
                    // as all the rendered chats are already "outdated"
                    // all old chats shall remove and reduced number of few chats will be rendered
                    // then restore to the original number
                    changeMaxItemsToDisplay = true;
                    this.data.maxItemsToDisplay = reducedMaxItemsToDisplay;
                    console.log(`'maxItemsToDisplay' is reduced from ${tmpMaxItemsCount} to ${reducedMaxItemsToDisplay}.`)
                  }
                  this.activeItems_.splice(0, activeItemsLen - this.data.maxItemsToDisplay);
                  //   console.log('changeMaxItemsToDisplay 01', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
                  console.log('new this.activeItems_.length > N', this.activeItems_.length);
                } else {
                  this.activeItems_.splice(0, activeItemsLen - (tmpMaxItemsCount < 900 ? tmpMaxItemsCount : 900));
                  console.log('new this.activeItems_.length > N', this.activeItems_.length);
                }
              }
              // it is found that it will render all stacked chats after switching back from background
              // to avoid lagging in popular livestream with massive chats, trim first before rendering.
              // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
              const items = (cnt.$ || 0).items;
              if (USE_WILL_CHANGE_CONTROLLER) {
                if (contensWillChangeController && contensWillChangeController.element !== items) {
                  contensWillChangeController.release();
                  contensWillChangeController = null;
                }
                if (!contensWillChangeController) contensWillChangeController = new WillChangeController(items, 'contents');
              }
              const wcController = contensWillChangeController;
              cnt.__intermediate_delay__ = Promise.all([cnt.__intermediate_delay__ || null, immd || null]);
              wcController && wcController.beforeOper();
              await Promise.resolve();
              const acItems = cnt.activeItems_;
              const len1 = acItems.length;
              if (!len1) console.warn('cnt.activeItems_.length = 0');
              let waitFor = [];
              /** @type {Set<string>} */
              const imageLinks = new Set();
              if (ENABLE_PRELOAD_THUMBNAIL || EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL) {
                for (const item of acItems) {
                  fixLiveChatItem(item, imageLinks);
                }
              }
              if (ENABLE_PRELOAD_THUMBNAIL && kptPF !== null && (kptPF & (8 | 4)) && imageLinks.size > 0) {
                if (emojiPrefetched.size > PREFETCH_LIMITED_SIZE_EMOJI) emojiPrefetched.clear();
                if (authorPhotoPrefetched.size > PREFETCH_LIMITED_SIZE_AUTHOR_PHOTO) authorPhotoPrefetched.clear();
                // reference: https://github.com/Yuanfang-fe/Blog-X/issues/34
                const rel = kptPF & 8 ? 'subresource' : kptPF & 16 ? 'preload' : kptPF & 4 ? 'prefetch' : '';
                // preload performs the high priority fetching.
                // prefetch delays the chat display if the video resoruce is demanding.
                if (rel) {
                  imageLinks.forEach(imageLink => {
                    let d = false;
                    const isEmoji = imageLink.includes('/emoji/');
                    const pretechedSet = isEmoji ? emojiPrefetched : authorPhotoPrefetched;
                    if (!pretechedSet.has(imageLink)) {
                      pretechedSet.add(imageLink);
                      d = true;
                    }
                    if (d) {
                      waitFor.push(linker(null, rel, imageLink, 'image'));
                    }
                  })
                }
              }
              const noVisibleItem1 = ((cnt.visibleItems || 0).length || 0) === 0;
              skipDontRender = noVisibleItem1;
              // console.log('ss1', Date.now())
              if (waitFor.length > 0) {
                await Promise.race([new Promise(r => setTimeout(r, 250)), Promise.all(waitFor)]);
              }
              waitFor.length = 0;
              waitFor = null;
              // console.log('ss2', Date.now())
              cnt.flushActiveItems66_();
              const noVisibleItem2 = ((cnt.visibleItems || 0).length || 0) === 0;
              skipDontRender = noVisibleItem2;
              const len2 = cnt.activeItems_.length;
              const bAsync = len1 !== len2;
              await Promise.resolve();
              if (wcController) {
                if (bAsync) {
                  cnt.async(() => {
                    wcController.afterOper();
                  });
                } else {
                  wcController.afterOper();
                }
              }
              if (changeMaxItemsToDisplay && this.data.maxItemsToDisplay === reducedMaxItemsToDisplay && tmpMaxItemsCount > reducedMaxItemsToDisplay) {
                this.data.maxItemsToDisplay = tmpMaxItemsCount;
                logger && console.log(`'maxItemsToDisplay' is restored from ${reducedMaxItemsToDisplay} to ${tmpMaxItemsCount}.`);
                //   console.log('changeMaxItemsToDisplay 02', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
              } else if (changeMaxItemsToDisplay) {
                logger && console.log(`'maxItemsToDisplay' cannot be restored`, {
                  maxItemsToDisplay: this.data.maxItemsToDisplay,
                  reducedMaxItemsToDisplay,
                  originalMaxItemsToDisplay: tmpMaxItemsCount
                });
              }
              logger && console.log('[End]');
              logger && console.groupEnd();
              if (noVisibleItem1 && !noVisibleItem2) {
                // fix possible no auto scroll issue.
                setTimeout(() => cnt.setAtBottom(), 1);
              }
              if (!ENABLE_NO_SMOOTH_TRANSFORM) {
                const ff = () => {
                  if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
                  //   if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
                  if (!cnt.atBottom && cnt.allowScroll && cnt.hasUserJustInteracted11_ && !cnt.hasUserJustInteracted11_()) {
                    if (typeof window.nextBrowserTick !== 'function') {
                      cnt.scrollToBottom_();
                      Promise.resolve().then(() => {
                        if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
                        if (!cnt.canScrollToBottom_()) cnt.scrollToBottom_();
                      });
                    } else {
                      nextBrowserTick(() => {
                        if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
                        cnt.scrollToBottom_();
                      });
                    }
                  }
                }
                ff();
                Promise.resolve().then(ff);
                // requestAnimationFrame(ff);
              } else if (true) { // it might not be sticky to bottom when there is a full refresh.
                const knt = cnt;
                if (!scrollChatFn) {
                  const cnt = knt;
                  const f = () => {
                    const itemScroller = cnt.itemScroller;
                    if (!itemScroller || itemScroller.isConnected === false || cnt.isAttached === false) return;
                    if (!cnt.atBottom) {
                      cnt.scrollToBottom_();
                    } else if (itemScroller.scrollTop === 0) { // not yet interacted by user; cannot stick to bottom
                      itemScroller.scrollTop = itemScroller.scrollHeight;
                    }
                  };
                  if (typeof window.nextBrowserTick !== 'function') {
                    scrollChatFn = () => Promise.resolve().then(f).then(f);
                  } else {
                    scrollChatFn = () => nextBrowserTick(f);
                  }
                }
                if (!ENABLE_DELAYED_CHAT_OCCURRENCE) scrollChatFn();
              }
              return 1;
            } catch (e) {
              console.warn(e);
            }
          }
          mclp.flushActiveItems77_ = function () {
            return new Promise(resResolve => {
              try {
                const cnt = this;
                if (mlf > 1e9) mlf = 9;
                let tid = ++mlf;
                const hostElement = cnt.hostElement || cnt;
                if (tid !== mlf || cnt.isAttached === false || hostElement.isConnected === false) return resResolve();
                if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return resResolve();
                // 4 times to maxItems to avoid frequent trimming.
                // 1 ... 10 ... 20 ... 30 ... 40 ... 50 ... 60 => 16 ... 20 ... 30 ..... 60 ... => 16
                const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
                this.activeItems_.length > lockedMaxItemsToDisplay * 4 && lockedMaxItemsToDisplay > 4 && this.activeItems_.splice(0, this.activeItems_.length - lockedMaxItemsToDisplay - 1);
                if (cnt.canScrollToBottom_()) {
                  cnt.mutexPromiseFA78 = (cnt.mutexPromiseFA78 || Promise.resolve())
                    .then(() => cnt.flushActiveItems78_(tid)) // async function
                    .then((asyncResult) => {
                      resResolve(asyncResult); // either undefined or 1
                      resResolve = null;
                    }).catch((e) => {
                      console.warn(e);
                      if (resResolve) resResolve();
                    });
                } else {
                  resResolve(2);
                  resResolve = null;
                }
              } catch (e) {
                console.warn(e);
                if (resResolve) resResolve();
              }
            });
          }
          mclp.flushActiveItems_ = function () {
            const cnt = this;
            if (arguments.length !== 0 || !cnt.activeItems_ || !cnt.canScrollToBottom_) return cnt.flushActiveItems66_.apply(this, arguments);
            if (cnt.activeItems_.length === 0) {
              cnt.__intermediate_delay__ = null;
              return;
            }
            const cntData = ((cnt || 0).data || 0);
            if (cntData.maxItemsToDisplay944 === undefined) {
              cntData.maxItemsToDisplay944 = null;
              if (cntData.maxItemsToDisplay > MAX_ITEMS_FOR_TOTAL_DISPLAY) cntData.maxItemsToDisplay = MAX_ITEMS_FOR_TOTAL_DISPLAY;
              cntData.maxItemsToDisplay944 = cntData.maxItemsToDisplay || null;
            }
            // ignore previous __intermediate_delay__ and create a new one
            cnt.__intermediate_delay__ = new Promise(resolve => {
              cnt.flushActiveItems77_().then(rt => {  // either undefined or 1 or 2
                if (rt === 1) {
                  resolve(1); // success, scroll to bottom
                  if (hasMoreMessageState === 1) {
                    hasMoreMessageState = 0;
                    const showMore = (cnt.$ || 0)['show-more'];
                    if (showMore) {
                      showMore.classList.remove('has-new-messages-miuzp');
                    }
                  }
                }
                else if (rt === 2) {
                  resolve(2); // success, trim
                  if (hasMoreMessageState === 0) {
                    hasMoreMessageState = 1;
                    const showMore = cnt.$['show-more'];
                    if (showMore) {
                      showMore.classList.add('has-new-messages-miuzp');
                    }
                  }
                }
                else resolve(-1); // skip
              }).catch(e => {
                console.warn(e);
              });
            });
          }
          console.log("flushActiveItems_", "OK");
        } else {
          console.log("flushActiveItems_", "NG");
        }
        if (SUPPRESS_refreshOffsetContainerHeight_ && typeof mclp.refreshOffsetContainerHeight_ === 'function' && !mclp.refreshOffsetContainerHeight26_ && mclp.refreshOffsetContainerHeight_.length === 0) {
          assertor(() => fnIntegrity(mclp.refreshOffsetContainerHeight_, '0.31.21'));
          mclp.refreshOffsetContainerHeight26_ = mclp.refreshOffsetContainerHeight_;
          mclp.refreshOffsetContainerHeight_ = function () {
            // var a = this.itemScroller.clientHeight;
            // this.itemOffset.style.height = this.items.clientHeight + "px";
            // this.bottomAlignMessages && (this.itemOffset.style.minHeight = a + "px")
          }
          console.log("refreshOffsetContainerHeight_", "OK");
        } else {
          console.log("refreshOffsetContainerHeight_", "NG");
        }
        mclp.delayFlushActiveItemsAfterUserAction11_ = async function () {
          try {
            if (mlg > 1e9) mlg = 9;
            const tid = ++mlg;
            const keepTrialCond = () => this.atBottom && this.allowScroll && (tid === mlg) && this.isAttached === true && this.activeItems_.length >= 1 && (this.hostElement || 0).isConnected === true;
            const runCond = () => this.canScrollToBottom_();
            if (!keepTrialCond()) return;
            if (runCond()) return this.flushActiveItems_() | 1; // avoid return promise
            await new Promise(r => setTimeout(r, 80));
            if (!keepTrialCond()) return;
            if (runCond()) return this.flushActiveItems_() | 1;
            await new Promise(requestAnimationFrame);
            if (runCond()) return this.flushActiveItems_() | 1;
          } catch (e) {
            console.warn(e);
          }
        }
        if ((mclp.atBottomChanged_ || 0).length === 1) {
          // note: if the scrolling is too frequent, the show more visibility might get wrong.
          const sfi = fnIntegrity(mclp.atBottomChanged_);
          if (sfi === '1.73.37') {
            // https://www.youtube.com/s/desktop/e4d15d2c/jsbin/live_chat_polymer.vflset/live_chat_polymer.js
          } else if (sfi === '1.75.39') {
            // e.g. https://www.youtube.com/yts/jsbin/live_chat_polymer-vflCyWEBP/live_chat_polymer.js
          } else {
            assertor(() => fnIntegrity(mclp.atBottomChanged_, '1.73.37'));
          }
          const querySelector = HTMLElement.prototype.querySelector;
          const U = (element) => ({
            querySelector: (selector) => querySelector.call(element, selector)
          });
          let qid = 0;
          mclp.atBottomChanged_ = function (a) {
            let tid = ++qid;
            let b = this;
            a ? this.hideShowMoreAsync_ || (this.hideShowMoreAsync_ = this.async(function () {
              if (tid !== qid) return;
              U(b.hostElement).querySelector("#show-more").style.visibility = "hidden"
            }, 200)) : (this.hideShowMoreAsync_ && this.cancelAsync(this.hideShowMoreAsync_),
              this.hideShowMoreAsync_ = null,
              U(this.hostElement).querySelector("#show-more").style.visibility = "visible")
          }
          console.log("atBottomChanged_", "OK");
        } else {
          console.log("atBottomChanged_", "NG");
        }
        if ((mclp.onScrollItems_ || 0).length === 1) {
          assertor(() => fnIntegrity(mclp.onScrollItems_, '1.17.9'));
          mclp.onScrollItems66_ = mclp.onScrollItems_;
          mclp.onScrollItems77_ = async function (evt) {
            if (myw > 1e9) myw = 9;
            let tid = ++myw;
            await new Promise(requestAnimationFrame);
            if (tid !== myw) {
              return;
            }
            const cnt = this;
            await Promise.resolve();
            if (USE_OPTIMIZED_ON_SCROLL_ITEMS) {
              await Promise.resolve().then(() => {
                this.ytRendererBehavior.onScroll(evt);
              }).then(() => {
                if (this.canScrollToBottom_()) {
                  const hasUserJustInteracted = this.hasUserJustInteracted11_ ? this.hasUserJustInteracted11_() : true;
                  if (hasUserJustInteracted) {
                    // only when there is an user action
                    this.setAtBottom();
                    return 1;
                  }
                } else {
                  // no message inserting
                  this.setAtBottom();
                  return 1;
                }
              }).then((r) => {
                if (this.activeItems_.length) {
                  if (this.canScrollToBottom_()) {
                    this.flushActiveItems_();
                    return 1 && r;
                  } else if (this.atBottom && this.allowScroll && (this.hasUserJustInteracted11_ && this.hasUserJustInteracted11_())) {
                    // delayed due to user action
                    this.delayFlushActiveItemsAfterUserAction11_ && this.delayFlushActiveItemsAfterUserAction11_();
                    return 0;
                  }
                }
              }).then((r) => {
                if (r) {
                  // ensure setAtBottom is correctly set
                  this.setAtBottom();
                }
              });
            } else {
              cnt.onScrollItems66_(evt);
            }
            await Promise.resolve();
          }
          mclp.onScrollItems_ = function (evt) {
            const cnt = this;
            cnt.__intermediate_delay__ = new Promise(resolve => {
              cnt.onScrollItems77_(evt).then(() => {
                resolve();
              });
            });
          }
          console.log("onScrollItems_", "OK");
        } else {
          console.log("onScrollItems_", "NG");
        }
        if ((mclp.handleLiveChatActions_ || 0).length === 1) {
          const sfi = fnIntegrity(mclp.handleLiveChatActions_);
          if (sfi === '1.39.20') {
            // TBC
          } else if (sfi === '1.31.17') {
            // original
          } else {
            assertor(() => fnIntegrity(mclp.handleLiveChatActions_, '1.31.17'));
          }
          mclp.handleLiveChatActions66_ = mclp.handleLiveChatActions_;
          mclp.handleLiveChatActions77_ = async function (arr) {
            if (typeof (arr || 0).length !== 'number') {
              this.handleLiveChatActions66_(arr);
              return;
            }
            if (mzt > 1e9) mzt = 9;
            let tid = ++mzt;
            if (zarr === null) zarr = arr;
            else Array.prototype.push.apply(zarr, arr);
            arr = null;
            await new Promise(requestAnimationFrame);
            if (tid !== mzt || zarr === null) {
              return;
            }
            const carr = zarr;
            zarr = null;
            await Promise.resolve();
            this.handleLiveChatActions66_(carr);
            await Promise.resolve();
          }
          mclp.handleLiveChatActions_ = function (arr) {
            const cnt = this;
            cnt.__intermediate_delay__ = new Promise(resolve => {
              cnt.handleLiveChatActions77_(arr).then(() => {
                resolve();
              });
            });
          }
          console.log("handleLiveChatActions_", "OK");
        } else {
          console.log("handleLiveChatActions_", "NG");
        }
        mclp.hasUserJustInteracted11_ = () => {
          const t = dateNow();
          return (t - lastWheel < 80) || currentMouseDown || currentTouchDown || (t - lastUserInteraction < 80);
        }
        if ((mclp.canScrollToBottom_ || 0).length === 0) {
          assertor(() => fnIntegrity(mclp.canScrollToBottom_, '0.9.5'));
          mclp.canScrollToBottom_ = function () {
            return this.atBottom && this.allowScroll && !this.hasUserJustInteracted11_();
          }
          console.log("canScrollToBottom_", "OK");
        } else {
          console.log("canScrollToBottom_", "NG");
        }
        if (ENABLE_NO_SMOOTH_TRANSFORM) {
          mclp.isSmoothScrollEnabled_ = function () {
            return false;
          }
          mclp.maybeResizeScrollContainer_ = function () {
            //
          }
          mclp.refreshOffsetContainerHeight_ = function () {
            //
          }
          mclp.smoothScroll_ = function () {
            //
          }
          mclp.resetSmoothScroll_ = function () {
            //
          }
          console.log("ENABLE_NO_SMOOTH_TRANSFORM", "OK");
        } else {
          console.log("ENABLE_NO_SMOOTH_TRANSFORM", "NG");
        }
        if (typeof mclp.forEachItem_ === 'function' && !mclp.forEachItem66_ && skipErrorForhandleAddChatItemAction_ && mclp.forEachItem_.length === 1) {
          mclp.forEachItem66_ = mclp.forEachItem_;
          mclp.forEachItem_ = function (a) {
            // ƒ (a){this.visibleItems.forEach(a.bind(this,"visibleItems"));this.activeItems_.forEach(a.bind(this,"activeItems_"))}
            try {
              let items801 = false;
              if (typeof a === 'function') {
                const items = this.items;
                if (items instanceof HTMLDivElement) {
                  const ev = this.visibleItems;
                  const ea = this.activeItems_;
                  if (ev && ea && ev.length >= 0 && ea.length >= 0) {
                    items801 = items;
                  }
                }
              }
              if (items801) {
                items801.__children801__ = 1;
                const res = this.forEachItem66_(a);
                items801.__children801__ = 0;
                return res;
              }
            } catch (e) { }
            return this.forEachItem66_(a);
            // this.visibleItems.forEach((val, idx, arr)=>{
            //   a.call(this, 'visibleItems', val, idx, arr);
            // });
            // this.activeItems_.forEach((val, idx, arr)=>{
            //   a.call(this, 'activeItems_', val, idx, arr);
            // });
          }
        }
        if (typeof mclp.handleAddChatItemAction_ === 'function' && !mclp.handleAddChatItemAction66_ && FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION && (EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL)) {
          mclp.handleAddChatItemAction66_ = mclp.handleAddChatItemAction_;
          mclp.handleAddChatItemAction_ = function (a) {
            try {
              if (a && typeof a === 'object' && !('length' in a)) {
                fixLiveChatItem(a.item, null);
                console.assert(arguments[0] === a);
              }
            } catch (e) { console.warn(e) }
            let res;
            if (skipErrorForhandleAddChatItemAction_) { // YouTube Native Engine Issue
              try {
                res = this.handleAddChatItemAction66_.apply(this, arguments);
              } catch (e) {
                if (e && (e.message || '').includes('.querySelector(')) {
                  console.log("skipErrorForhandleAddChatItemAction_", e.message);
                } else {
                  throw e;
                }
              }
            } else {
              res = this.handleAddChatItemAction66_.apply(this, arguments);
            }
            return res;
          }
          if (FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION) console.log("handleAddChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION ]", "OK");
        } else {
          if (FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION) console.log("handleAddChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_ADDITION ]", "OK");
        }
        if (typeof mclp.handleReplaceChatItemAction_ === 'function' && !mclp.handleReplaceChatItemAction66_ && FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT && (EMOJI_IMAGE_SINGLE_THUMBNAIL || AUTHOR_PHOTO_SINGLE_THUMBNAIL)) {
          mclp.handleReplaceChatItemAction66_ = mclp.handleReplaceChatItemAction_;
          mclp.handleReplaceChatItemAction_ = function (a) {
            try {
              if (a && typeof a === 'object' && !('length' in a)) {
                fixLiveChatItem(a.replacementItem, null);
                console.assert(arguments[0] === a);
              }
            } catch (e) { console.warn(e) }
            return this.handleReplaceChatItemAction66_.apply(this, arguments);
          }
          if (FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT) console.log("handleReplaceChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT ]", "OK");
        } else {
          if (FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT) console.log("handleReplaceChatItemAction_ [ FIX_THUMBNAIL_SIZE_ON_ITEM_REPLACEMENT ]", "OK");
        }
        console.log("[End]");
        console.groupEnd();
      }).catch(console.warn);
      const tickerContainerSetAttribute = function (attrName, attrValue) { // ensure '14.30000001%'.toFixed(1)
        let yd = (this.__dataHost || insp(this).__dataHost || 0).__data;
        if (arguments.length === 2 && attrName === 'style' && yd && attrValue) {
          // let v = yd.containerStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_;
          let v = `${attrValue}`;
          // conside a ticker is 101px width
          // 1% = 1.01px
          // 0.2% = 0.202px
          const ratio1 = (yd.ratio * 100);
          if (ratio1 > -1) { // avoid NaN
            // countdownDurationMs
            // 600000 - 0.2%    <1% = 6s>  <0.2% = 1.2s>
            // 300000 - 0.5%    <1% = 3s>  <0.5% = 1.5s>
            // 150000 - 1%    <1% = 1.5s>
            // 75000 - 2%    <1% =0.75s > <2% = 1.5s>
            // 30000 - 5%    <1% =0.3s > <5% = 1.5s>
            // 99px * 5% = 4.95px
            // 15000 - 10%    <1% =0.15s > <10% = 1.5s>
            // 1% Duration
            let ratio2 = ratio1;
            const ydd = yd.data;
            if (ydd) {
              const d1 = ydd.durationSec;
              const d2 = ydd.fullDurationSec;
              // @ step timing [min. 0.2%]
              let numOfSteps = 500;
              if ((d1 === d2 || (d1 + 1 === d2)) && d1 > 1) {
                if (d2 > 400) numOfSteps = 500; // 0.2%
                else if (d2 > 200) numOfSteps = 200; // 0.5%
                else if (d2 > 100) numOfSteps = 100; // 1%
                else if (d2 > 50) numOfSteps = 50; // 2%
                else if (d2 > 25) numOfSteps = 20; // 5% (max => 99px * 5% = 4.95px)
                else numOfSteps = 20;
              }
              if (numOfSteps > TICKER_MAX_STEPS_LIMIT) numOfSteps = TICKER_MAX_STEPS_LIMIT;
              if (numOfSteps < 5) numOfSteps = 5;
              const rd = numOfSteps / 100.0;
              ratio2 = Math.round(ratio2 * rd) / rd;
              // ratio2 = Math.round(ratio2 * 5) / 5;
              ratio2 = ratio2.toFixed(1);
              v = v.replace(`${ratio1}%`, `${ratio2}%`).replace(`${ratio1}%`, `${ratio2}%`);
              if (yd.__style_last__ === v) return;
              yd.__style_last__ = v;
              // do not consider any delay here.
              // it shall be inside the looping for all properties changes. all the css background ops are in the same microtask.
            }
          }
          HTMLElement.prototype.setAttribute.call(dr(this), attrName, v);
        } else {
          HTMLElement.prototype.setAttribute.apply(dr(this), arguments);
        }
      };
      const fpTicker = (renderer) => {
        const cnt = insp(renderer);
        assertor(() => typeof (cnt || 0).is === 'string');
        assertor(() => ((cnt || 0).hostElement || 0).nodeType === 1);
        const container = (cnt.$ || 0).container;
        if (container) {
          assertor(() => (container || 0).nodeType === 1);
          assertor(() => typeof container.setAttribute === 'function');
          container.setAttribute = tickerContainerSetAttribute;
        } else {
          console.warn(`"container" does not exist in ${cnt.is}`);
        }
      };
      const tags = [
        "yt-live-chat-ticker-paid-message-item-renderer",
        "yt-live-chat-ticker-paid-sticker-item-renderer",
        "yt-live-chat-ticker-renderer",
        "yt-live-chat-ticker-sponsor-item-renderer"
      ];
      const tagsItemRenderer = [
        "yt-live-chat-ticker-paid-message-item-renderer",
        "yt-live-chat-ticker-paid-sticker-item-renderer",
        "yt-live-chat-ticker-renderer",
        "yt-live-chat-ticker-sponsor-item-renderer"
      ];
      Promise.all(tags.map(tag => customElements.whenDefined(tag))).then(() => {
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-... hacks");
        console.log("[Begin]");
        let dummyValueForStyleReturn = null;
        const genDummyValueForStyleReturn = () => {
          let s = `--nx:82;`
          let ro = {
            "privateDoNotAccessOrElseSafeStyleWrappedValue_": s,
            "implementsGoogStringTypedString": true
          };
          ro.getTypedStringValue = ro.toString = function () { return this.privateDoNotAccessOrElseSafeStyleWrappedValue_ };
          return ro;
        }
        let isCSSPropertySupported_ = null;
        const isCSSPropertySupported = () => {
          // @property --ticker-rtime
          if (typeof isCSSPropertySupported_ === 'boolean') return isCSSPropertySupported_;
          isCSSPropertySupported_ = false;
          if (typeof CSS !== 'object' || typeof (CSS || 0).registerProperty !== 'function') return false;
          const documentElement = document.documentElement;
          if (!documentElement) {
            console.warn('document.documentElement is not found');
            return false;
          }
          if (`${getComputedStyleCached(documentElement).getPropertyValue('--ticker-rtime')}`.length === 0) {
            return false;
          }
          const ae = animate.call(documentElement,
            [
              { '--ticker-rtime': '70%' },
              { '--ticker-rtime': '30%' }
            ],
            {
              fill: "forwards",
              duration: 1000 * 40,
              easing: 'linear'
            }
          );
          let animatedValue = getComputedStyleCached(document.documentElement).getPropertyValue('--ticker-rtime');
          ae.finish();
          if (`${animatedValue}`.length !== 3) return false;
          isCSSPropertySupported_ = true;
          return true;
        };
        let windowShownAt = -1;
        const setupEventForWindowShownAt = () => {
          window.addEventListener('visibilitychange', () => {
            if (document.visibilityState === 'visible') windowShownAt = Date.now();
            else windowShownAt = 0;
          }, false);
        }
        const dProto = {
          attachedForTickerInit: function () {
            fpTicker(this.hostElement || this);
            return this.attached77();
          },
          // doAnimator
          _makeAnimator: function () {
            if (this._r782) return;
            // if (!this.isAttached) return;
            if (!this._runnerAE) {
              /** @type {HTMLElement | null} */
              const aElement = (this.$ || 0).container;
              if (!aElement) return console.warn("this.$.container is undefined");
              const da = this.data;
              if (!da || !da.startBackgroundColor || !da.endBackgroundColor) return console.warn("this.data is undefined or incorrect");
              const c1 = this.colorFromDecimal(da.startBackgroundColor);
              const c2 = this.colorFromDecimal(da.endBackgroundColor);
              if (typeof c1 !== 'string' || typeof c2 !== 'string') return console.warn('c1, c2 is not a string');
              // if (!this.__tickerBackgroundInitialChecked__) {
              //   this.constructor.prototype.__tickerBackgroundInitialChecked__ = true;
              //   console.log('__tickerBackgroundInitialChecked__')
              //   this._checkTickerBackgroundChanged();
              // }
              aElement.style.setProperty('--ticker-c1', c1);
              aElement.style.setProperty('--ticker-c2', c2);
              aElement.classList.add(runTickerClassName);
              const p = (this.countdownMs / this.countdownDurationMs) * 100;
              // this._aeStartV = this.countdownMs;
              // this._aeStartT = this.countdownDurationMs;
              if (!(p >= 0 && p <= 100)) {
                console.warn('incorrect time ratio', p);
              } else {
                /*
                const u0 = p.toFixed(4) + '%';
                this._runnerAE = animate.call(aElement,
                  [
                    { '--ticker-rtime': u0 },
                    { '--ticker-rtime': '0%' }
                  ]
                  ,
                  {
                    fill: "forwards",
                    duration: this.countdownMs,
                    easing: "linear"
                  }
                );
                */
                let timingFn = 'linear';
                const totalDuration = this.countdownDurationMs;
                if (ATTEMPT_ANIMATED_TICKER_BACKGROUND === 'steps') {
                  // @ step timing [min. 0.2%]
                  let stepInterval = 0.2; // unit: %
                  if (totalDuration > 400000) stepInterval = 0.2;
                  else if (totalDuration > 200000) stepInterval = 0.5;
                  else if (totalDuration > 100000) stepInterval = 1;
                  else if (totalDuration > 50000) stepInterval = 2;
                  else if (totalDuration > 25000) stepInterval = 5;
                  else stepInterval = 5;
                  let numOfSteps = Math.round(100 / stepInterval);
                  if (numOfSteps > TICKER_MAX_STEPS_LIMIT) numOfSteps = TICKER_MAX_STEPS_LIMIT;
                  if (numOfSteps < 5) numOfSteps = 5;
                  timingFn = `steps(${numOfSteps}, end)`;
                }
                /** @type {Animation} */
                const ae = animate.call(aElement,
                  [
                    { '--ticker-rtime': '100%' },
                    { '--ticker-rtime': '0%' }
                  ]
                  ,
                  {
                    fill: "forwards",
                    duration: totalDuration,
                    easing: timingFn
                  }
                );
                this._runnerAE = ae;
                ae.onfinish = (event) => {
                  this.onfinish = null;
                  if (this._runnerAE !== ae) return;
                  if (this.isAttached === true && !this._r782 && ((this.$ || 0).container || 0).isConnected === true) {
                    this._aeFinished(event);
                  }
                }
                let bq = (1.0 - (this.countdownMs / totalDuration)) * totalDuration;
                if (bq >= 0 && bq <= totalDuration) {
                  if (bq > totalDuration - 1) {
                    ae.currentTime = bq;
                    // setTimeout(() => {
                    //   if (this._runnerAE === ae && ae.onfinish) ae.onfinish();
                    // }, 1);
                  } else {
                    ae.currentTime = bq;
                  }
                } else {
                  console.warn('Error on setting _runnerAE.currentTime!');
                }
                aeConstructor = ae.constructor; // constructor is from iframe
                return ae;
              }
            } else {
              if (!aeConstructor) return console.warn('aeConstructor is undefined');
              // assume just time update
              const ae = this._runnerAE;
              if (!(ae instanceof aeConstructor)) return console.warn('this._runnerAE is not Animation');
              if (ae.playState !== 'paused') console.warn('ae.playState !== paused');
              let p = (this.countdownMs / this.countdownDurationMs) * 100;
              if (!(p >= 0 && p <= 100)) {
                console.warn('incorrect time ratio', p);
              } else {
                // let u0 = p.toFixed(4) + '%'
                /*
                ae.effect.setKeyframes([
                  { '--ticker-rtime': u0 },
                  { '--ticker-rtime': '0%' }
                ]);
                ae.effect.updateTiming({ duration: this.countdownMs });
                */
                // ae.currentTime = 0;
                let bq = (1.0 - (this.countdownMs / this.countdownDurationMs)) * this.countdownDurationMs;
                if (bq >= 0 && bq <= this.countdownDurationMs) {
                  this._runnerAE.currentTime = bq
                } else {
                  console.warn('Error on setting _runnerAE.currentTime!');
                }
                ae.play();
                return ae;
              }
            }
          },
          _aeFinished: function (event) {
            if (this._r782) return;
            if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
              this._throwOut();
              return;
            }
            if (!this._runnerAE) console.warn('Error in .updateTimeout; this._runnerAE is undefined');
            let lc = window.performance.now();
            this.countdownMs = Math.max(0, this.countdownMs - (lc - this.lastCountdownTimeMs));
            if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
            this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = lc;
            if (this.countdownMs > 76) console.warn('Warning: this.countdownMs is not zero when finished!', this.countdownMs, this, event); // just warning.
            this.countdownMs = 0;
            this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = null;
            if (this.isAttached) {
              let fastRemoved = false;
              if (Date.now() - windowShownAt < 80 && typeof this.requestRemoval === 'function') {
                // no animation if the video page is switched from background to foreground
                // this.hostElement.style.display = 'none';
                const id = (this.data || 0).id || 0;
                if (!id) this.data = { id: 1 }
                try {
                  this.requestRemoval();
                  fastRemoved = true;
                } catch (e) {
                }
              }
              if (!fastRemoved) {
                "auto" === this.hostElement.style.width && this.setContainerWidth();
                this.slideDown();
              }
            }
          },
          /** @type {()} */
          _throwOut: function () {
            this._r782 = 1;
            Promise.resolve().then(() => {
              if (typeof this.requestRemoval === 'function') {
                const id = (this.data || 0).id;
                if (!id) this.data = { id: 1 };
                try {
                  this.requestRemoval();
                } catch (e) { }
              }
              this.detached();
              if (this.__dataClientsReady === true) this.__dataClientsReady = false;
              if (this.__dataEnabled === true) this.__dataEnabled = false;
              if (this.__dataReady === true) this.__dataReady = false;
              this.data = null;
              this.countdownMs = 0;
              this.lastCountdownTimeMs = null;
              const hm = this.hostElement || this;
              if (hm.parentNode) hm.remove();
              for (let t; t = hm.firstChild;) t.remove();
            }).catch(e => {
              console.warn(e);
            });
          },
          // doTimerFnModification
          /** @type {(a, b)} */
          startCountdownForTimerFnModA: function (a, b) { // .startCountdown(a.durationSec, a.fullDurationSec)
            try {
              // a.durationSec [s] => countdownMs [ms]
              // a.fullDurationSec [s] => countdownDurationMs [ms] OR countdownMs [ms]
              // lastCountdownTimeMs => raf ongoing
              // lastCountdownTimeMs = 0 when rafId = 0 OR countdownDurationMs = 0
              if (this._r782) return;
              if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
                this._throwOut();
                return;
              }
              // TimerFnModA
              b = void 0 === b ? 0 : b;
              if (void 0 !== a) {
                this.countdownMs = 1E3 * a; // decreasing from durationSec[s] to zero
                this.countdownDurationMs = b ? 1E3 * b : this.countdownMs; // constant throughout the animation
                if (!(this.lastCountdownTimeMs || this.isAnimationPaused)) {
                  this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = performance.now()
                  this.rafId = 1
                  if (this._runnerAE) console.warn('Error in .startCountdown; this._runnerAE already created.')
                  this.detlaSincePausedSecs = 0;
                  const ae = this._makeAnimator();
                  if (!ae) console.warn('Error in startCountdown._makeAnimator()');
                  // if (playerProgressChangedArg1 === null) {
                  //   console.log('startCountdownForTimerFnModA', this.data)
                  // }
                  if (isPlayProgressTriggered && this.isAnimationPaused !== true && this.__ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED__) {
                    this.playerProgressSec = lastPlayerProgress > 0 ? lastPlayerProgress : 0; // save the progress first
                    this.isAnimationPaused = true; // trigger isAnimationPausedChanged
                    this.detlaSincePausedSecs = 0;
                    this._forceNoDetlaSincePausedSecs783 = 1; // reset this.detlaSincePausedSecs = 0 when resumed
                    relayPromise = relayPromise || new PromiseExternal();
                    relayPromise.then(() => {
                      if (this.isAttached === true && this.countdownDurationMs > 0 && this.isAnimationPaused === true && this.isReplayPaused !== true) {
                        this.isAnimationPaused = false;
                      }
                    });
                  }
                }
              }
            } catch (e) {
              console.warn(e);
            }
          },
          /** @type {(a, b)} */
          startCountdownForTimerFnModT: function (a, b) { // .startCountdown(a.durationSec, a.fullDurationSec)
            try {
              // a.durationSec [s] => countdownMs [ms]
              // a.fullDurationSec [s] => countdownDurationMs [ms] OR countdownMs [ms]
              // lastCountdownTimeMs => raf ongoing
              // lastCountdownTimeMs = 0 when rafId = 0 OR countdownDurationMs = 0
              if (this._r782) return;
              if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
                this._throwOut();
                return;
              }
              // TimerFnModT
              // console.log('cProto.startCountdown', tag) // yt-live-chat-ticker-sponsor-item-renderer
              if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
              b = void 0 === b ? 0 : b;
              void 0 !== a && (this.countdownMs = 1E3 * a,
                this.countdownDurationMs = b ? 1E3 * b : this.countdownMs,
                this.ratio = 1,
                this.lastCountdownTimeMs || this.isAnimationPaused || (this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = performance.now(),
                  this.rafId = rafHub.request(this.boundUpdateTimeout37_)))
            } catch (e) {
              console.warn(e);
            }
          },
          /** @type {(a,)} */
          updateTimeoutForTimerFnModA: function (a) {
            try {
              // _lastCountdownTimeMsX0 is required since performance.now() is not fully the same with rAF timestamp
              if (this._r782) return;
              if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
                this._throwOut();
                return;
              }
              // TimerFnModA
              if (!this._runnerAE) console.warn('Error in .updateTimeout; this._runnerAE is undefined');
              if (this.lastCountdownTimeMs !== this._lastCountdownTimeMsX0) {
                this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
              }
              if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
              if (this.isAttached && this.countdownMs) {
                this.lastCountdownTimeMs = a
                const ae = this._makeAnimator(); // request raf
                if (!ae) console.warn('Error in startCountdown._makeAnimator()');
              } else {
                (this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = null,
                  this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
                    this.slideDown()));
              }
            } catch (e) {
              console.warn(e);
            }
          },
          /** @type {(a,)} */
          updateTimeoutForTimerFnModT: function (a) {
            try {
              // _lastCountdownTimeMsX0 is required since performance.now() is not fully the same with rAF timestamp
              if (this._r782) return;
              if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
                this._throwOut();
                return;
              }
              // TimerFnModT
              // console.log('cProto.updateTimeout', tag) // yt-live-chat-ticker-sponsor-item-renderer
              if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
              if (this.lastCountdownTimeMs !== this._lastCountdownTimeMsX0) {
                this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
              }
              // console.log(703, this.countdownMs)
              this.ratio = this.countdownMs / this.countdownDurationMs;
              this.isAttached && this.countdownMs ? (this.lastCountdownTimeMs = a,
                this.rafId = rafHub.request(this.boundUpdateTimeout37_)) : (this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = null,
                  this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
                    this.slideDown()))
            } catch (e) {
              console.warn(e);
            }
          },
          /** @type {(a,b)} */
          isAnimationPausedChangedForTimerFnModA: function (a, b) {
            if (this._r782) return;
            if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
              this._throwOut();
              return;
            }
            let forceNoDetlaSincePausedSecs783 = this._forceNoDetlaSincePausedSecs783;
            this._forceNoDetlaSincePausedSecs783 = 0;
            Promise.resolve().then(() => {
              if (a) {
                if (this._runnerAE && this._runnerAE.playState === 'running') {
                  this._runnerAE.pause()
                  let lc = window.performance.now();
                  this.countdownMs = Math.max(0, this.countdownMs - (lc - this.lastCountdownTimeMs));
                  if (this.countdownMs > this.countdownDurationMs) this.countdownMs = this.countdownDurationMs;
                  this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = lc;
                }
              } else if (!a && b) {
                if (forceNoDetlaSincePausedSecs783) this.detlaSincePausedSecs = 0;
                a = this.detlaSincePausedSecs ? (this.lastCountdownTimeMs || 0) + 1000 * this.detlaSincePausedSecs : (this.lastCountdownTimeMs || 0);
                this.detlaSincePausedSecs = 0;
                this.updateTimeout(a);
                this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = window.performance.now();
              }
            }).catch(e => {
              console.log(e);
            });
          },
          /** @type {(a,b)} */
          isAnimationPausedChangedForTimerFnModT: function (a, b) {
            if (this._r782) return;
            if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
              this._throwOut();
              return;
            }
            let forceNoDetlaSincePausedSecs783 = this._forceNoDetlaSincePausedSecs783;
            this._forceNoDetlaSincePausedSecs783 = 0;
            Promise.resolve().then(() => {
              // TimerFnModT
              // ez++;
              // if(ez> 1e9) ez=9;
              if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
              a ? rafHub.cancel(this.rafId) : !a && b && (a = this.lastCountdownTimeMs || 0,
                this.detlaSincePausedSecs && (a = (this.lastCountdownTimeMs || 0) + 1E3 * this.detlaSincePausedSecs,
                  this.detlaSincePausedSecs = 0),
                this.boundUpdateTimeout37_(a),
                this.lastCountdownTimeMs = this._lastCountdownTimeMsX0 = window.performance.now())
            }).catch(e => {
              console.log(e);
            });
          },
          /** @type {(a,b)} */
          computeContainerStyleForAnimatorEnabled: function (a, b) {
            if (this._r782) return;
            if (this.isAttached === false && ((this.$ || 0).container || 0).isConnected === false) {
              this._throwOut();
              return;
            }
            return (dummyValueForStyleReturn || (dummyValueForStyleReturn = genDummyValueForStyleReturn()));
          },
          /** @type {()} */
          handlePauseReplayForPlaybackProgressState: function () {
            if (!playerEventsByIframeRelay) return this.handlePauseReplay66.apply(this, arguments);
            if (onPlayStateChangePromise) {
              if (this.rtu > 1e9) this.rtu = this.rtu % 1e4;
              const tid = ++this.rtu;
              onPlayStateChangePromise.then(() => {
                if (tid === this.rtu && !onPlayStateChangePromise) this.handlePauseReplay.apply(this, arguments);
              });
              return;
            }
            if (playerState !== 2) return;
            if (this.isAttached) {
              if (this.rtk > 1e9) this.rtk = this.rtk % 1e4;
              const tid = ++this.rtk;
              const tc = relayCount;
              foregroundPromiseFn().then(() => {
                if (tid === this.rtk && tc === relayCount && playerState === 2 && _playerState === playerState) {
                  this.handlePauseReplay66();
                }
              })
            }
          },
          /** @type {()} */
          handleResumeReplayForPlaybackProgressState: function () {
            if (!playerEventsByIframeRelay) return this.handleResumeReplay66.apply(this, arguments);
            if (onPlayStateChangePromise) {
              if (this.rtv > 1e9) this.rtv = this.rtv % 1e4;
              const tid = ++this.rtv;
              onPlayStateChangePromise.then(() => {
                if (tid === this.rtv && !onPlayStateChangePromise) this.handleResumeReplay.apply(this, arguments);
              });
              return;
            }
            if (playerState !== 1) return;
            if (this.isAttached) {
              const tc = relayCount;
              relayPromise = relayPromise || new PromiseExternal();
              relayPromise.then(() => {
                if (relayCount > tc && playerState === 1 && _playerState === playerState) {
                  this.handleResumeReplay66();
                }
              });
            }
          },
          /** @type {(a,)} */
          handleReplayProgressForPlaybackProgressState: function (a) {
            if (this.isAttached) {
              const tid = ++this.rtk;
              foregroundPromiseFn().then(() => {
                if (tid === this.rtk) {
                  this.handleReplayProgress66(a);
                }
              })
            }
          }
        }
        for (const tag of tagsItemRenderer) { // ##tag##
          const dummy = document.createElement(tag);
          const cProto = getProto(dummy);
          if (!cProto || !cProto.attached) {
            console.warn(`proto.attached for ${tag} is unavailable.`);
            continue;
          }
          cProto.attached77 = cProto.attached;
          cProto.attached = dProto.attachedForTickerInit;
          let rafHackState = 0;
          let isTimingFunctionHackable = false;
          let urt = 0;
          if (typeof cProto.startCountdown === 'function' && typeof cProto.updateTimeout === 'function' && typeof cProto.isAnimationPausedChanged === 'function') {
            // console.log('startCountdown', typeof cProto.startCountdown)
            // console.log('updateTimeout', typeof cProto.updateTimeout)
            // console.log('isAnimationPausedChanged', typeof cProto.isAnimationPausedChanged)
            isTimingFunctionHackable = fnIntegrity(cProto.startCountdown, '2.66.37') && fnIntegrity(cProto.updateTimeout, '1.76.45') && fnIntegrity(cProto.isAnimationPausedChanged, '2.56.30')
          } else {
            console.log("ATTEMPT_ANIMATED_TICKER_BACKGROUND", ` ${tag}`, "Skip Timing Function Modification");
            continue;
          }
          if (ENABLE_RAF_HACK_TICKERS && rafHub !== null) {
            // cancelable - this.rafId < isAnimationPausedChanged >
            rafHackState = 1;
            if (isTimingFunctionHackable) {
              rafHackState = 2;
            } else {
              rafHackState = 4;
            }
          }
          const doAnimator = !!ATTEMPT_ANIMATED_TICKER_BACKGROUND && isTimingFunctionHackable && typeof KeyframeEffect === 'function' && typeof animate === 'function' && typeof cProto.computeContainerStyle === 'function' && typeof cProto.colorFromDecimal === 'function' && isCSSPropertySupported();
          const doRAFHack = rafHackState === 2;
          cProto._throwOut = dProto._throwOut;
          cProto._makeAnimator = doAnimator ? dProto._makeAnimator : null;
          cProto._aeFinished = doAnimator ? dProto._aeFinished : null;
          if (ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX) {
            if (typeof cProto.handlePauseReplay === 'function' && !cProto.handlePauseReplay66 && cProto.handlePauseReplay.length === 0) {
              urt++;
              assertor(() => fnIntegrity(cProto.handlePauseReplay, '0.12.4'));
            } else {
              console.log('Error for setting cProto.handlePauseReplay', tag)
            }
            if (typeof cProto.handleResumeReplay === 'function' && !cProto.handleResumeReplay66 && cProto.handlePauseReplay.length === 0) {
              urt++;
              assertor(() => fnIntegrity(cProto.handleResumeReplay, '0.8.2'));
            } else {
              console.log('Error for setting cProto.handleResumeReplay', tag)
            }
            if (typeof cProto.handleReplayProgress === 'function' && !cProto.handleReplayProgress66 && cProto.handleReplayProgress.length === 1) {
              urt++;
              assertor(() => fnIntegrity(cProto.handleReplayProgress, '1.16.13'));
            } else {
              console.log('Error for setting cProto.handleReplayProgress', tag)
            }
          }
          const ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED = ENABLE_VIDEO_PLAYBACK_PROGRESS_STATE_FIX && urt === 3;
          cProto.__ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED__ = ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED;
          if (ENABLE_VIDEO_PROGRESS_STATE_FIX_AND_URT_PASSED) {
            cProto.rtk = 0;
            cProto.rtu = 0;
            cProto.rtv = 0;
            cProto.handlePauseReplay66 = cProto.handlePauseReplay;
            cProto.handlePauseReplay = dProto.handlePauseReplayForPlaybackProgressState;
            cProto.handleResumeReplay66 = cProto.handleResumeReplay;
            cProto.handleResumeReplay = dProto.handleResumeReplayForPlaybackProgressState;
            cProto.handleReplayProgress66 = cProto.handleReplayProgress;
            cProto.handleReplayProgress = dProto.handleReplayProgressForPlaybackProgressState;
          }
          const doTimerFnModification = (doRAFHack || doAnimator);
          if (doAnimator && windowShownAt < 0) {
            windowShownAt = 0;
            setupEventForWindowShownAt();
          }
          if (doTimerFnModification) {
            cProto.startCountdown = (
              doAnimator ? dProto.startCountdownForTimerFnModA : dProto.startCountdownForTimerFnModT
            );
            // _lastCountdownTimeMsX0 is required since performance.now() is not fully the same with rAF timestamp
            cProto.updateTimeout = (
              doAnimator ? dProto.updateTimeoutForTimerFnModA : dProto.updateTimeoutForTimerFnModT
            );
            // let ez = 0;
            cProto.isAnimationPausedChanged = (
              doAnimator ? dProto.isAnimationPausedChangedForTimerFnModA : dProto.isAnimationPausedChangedForTimerFnModT
            );
          }
          if (doAnimator) {
            const s = fnIntegrity(cProto.computeContainerStyle);
            // 2.44.29 or 2.81.31
            if (s === '2.44.29' || s === '2.81.31') {
              //     var ofb = da([""])
              //         pfb = da("background:linear-gradient(90deg, {,{ {,{ {,{);".split("{"))
              // f.computeContainerStyle = function(a, b) {
              //     if (!a)
              //         return pi(ofb);
              //     var c = this.colorFromDecimal(a.startBackgroundColor);
              //     a = this.colorFromDecimal(a.endBackgroundColor);
              //     b = 100 * b + "%";
              //     return pi(pfb, c, c, b, a, b, a)
              // }
            } else {
              assertor(() => fnIntegrity(cProto.computeContainerStyle, '2.44.29'));
            }
            cProto.computeContainerStyle66 = cProto.computeContainerStyle;
            cProto.computeContainerStyle = dProto.computeContainerStyleForAnimatorEnabled;
          }
          if (doTimerFnModification === true) hasTimerModified = true;
          if (!!ATTEMPT_ANIMATED_TICKER_BACKGROUND) {
            console.log('ATTEMPT_ANIMATED_TICKER_BACKGROUND', tag, doAnimator ? 'OK' : 'NG');
          }
          if (!doAnimator && (rafHackState === 2 || rafHackState === 4)) {
            console.log('RAF_HACK_TICKERS', tag, doRAFHack ? "OK" : "NG");
          }
        }
        const selector = tags.join(', ');
        const elements = document.querySelectorAll(selector);
        if (elements.length >= 1) {
          for (const elm of elements) {
            if (insp(elm).isAttached === true) {
              fpTicker(elm);
            }
          }
        }
        console.log("[End]");
        console.groupEnd();
      }).catch(console.warn);
      customElements.whenDefined('yt-live-chat-ticker-renderer').then(() => {
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-renderer hacks");
        console.log("[Begin]");
        (() => {
          /* pending!!
          handleLiveChatAction
          removeTickerItemById
          _itemsChanged
          itemsChanged
          handleMarkChatItemAsDeletedAction
          handleMarkChatItemsByAuthorAsDeletedAction
          handleRemoveChatItemByAuthorAction
          */
          const tag = "yt-live-chat-ticker-renderer"
          const dummy = document.createElement(tag);
          const cProto = getProto(dummy);
          if (!cProto || !cProto.attached) {
            console.warn(`proto.attached for ${tag} is unavailable.`);
            return;
          }
          const do_amend_ticker_handleLiveChatAction = AMEND_TICKER_handleLiveChatAction
            && typeof cProto.handleLiveChatAction === 'function' && !cProto.handleLiveChatAction45 && cProto.handleLiveChatAction.length === 1
            && typeof cProto.handleLiveChatActions === 'function' && !cProto.handleLiveChatActions45 && cProto.handleLiveChatActions.length === 1
            && typeof cProto.unshift === 'function' && cProto.unshift.length === 1
            && typeof cProto.handleMarkChatItemAsDeletedAction === 'function' && cProto.handleMarkChatItemAsDeletedAction.length === 1
            && typeof cProto.removeTickerItemById === 'function' && cProto.removeTickerItemById.length === 1
            && typeof cProto.handleMarkChatItemsByAuthorAsDeletedAction === 'function' && cProto.handleMarkChatItemsByAuthorAsDeletedAction.length === 1
            && typeof cProto.handleRemoveChatItemByAuthorAction === 'function' && cProto.handleRemoveChatItemByAuthorAction.length === 1
            ;
          console.log('do_amend_ticker_handleLiveChatAction', fnIntegrity(cProto.handleLiveChatAction), fnIntegrity(cProto.handleLiveChatActions))
          if (do_amend_ticker_handleLiveChatAction) {
            if (fnIntegrity(cProto.handleLiveChatActions) === '1.23.12') {
              console.log(`handleLiveChatActions`, 'modified');
              cProto.handleLiveChatActions45 = cProto.handleLiveChatActions;
              cProto.handleLiveChatActions = function (a) {
                /**
                 *
                    f.handleLiveChatActions = function(a) {
                        a.length && (a.forEach(this.handleLiveChatAction, this),
                        this.updateHighlightedItem(),
                        this.shouldAnimateIn = !0)
                    }
                 *
                 */
                const len = a.length;
                if (len) {
                  const batchToken = String.fromCharCode(Date.now() % 26 + 97) + Math.floor(Math.random() * 19861 + 19861).toString(36);
                  if (FIX_BATCH_TICKER_ORDER && len >= 2) {
                    
                    // Primarily for the initial batch, this is due to replayBuffer._back.
                    const entries = [];
                    const entriesI = [];
                    for (let i = 0; i < len; i++) {
                      const item = ((a[i] || 0).addLiveChatTickerItemAction || 0).item || 0;
                      const timestampUsec = item ? parseInt(getTimestampUsec(item[firstObjectKey(item)]), 10) : 0;
                      if (timestampUsec > 0) {
                        entriesI.push(i);
                        binaryInsert(entries, { e: a[i], timestampUsec }, (a, b) => {
                          const diff = a.timestampUsec - b.timestampUsec;
                          return diff > 0.1 ? 1 : diff < -0.1 ? -1 : 0;
                        });
                      }
                    }
                    const mLen = entries.length;
                    if (mLen >= 2) {
                      for (let j = 0; j < mLen; j++) {
                        a[entriesI[j]] = entries[j].e;
                      }
                    }
                    entries.length = 0;
                    entriesI.length = 0;
                  }
                  for (const action of a) {
                    action.__batchId45__ = batchToken;
                    this.handleLiveChatAction(action);
                  }
                }
              }
            }
            console.log(`handleLiveChatAction`, 'modified');
            const cacheChatActions = new LimitedSizeSet(16);
            cProto.handleLiveChatAction45 = cProto.handleLiveChatAction;
            cProto.handleLiveChatAction = function (a) {
              const key = firstObjectKey(a);
              if (!key) return;
              const val = a[key];
              let itemKey = '';
              let itemId = '';
              const valItem = val ? val.item : null;
              if (valItem) {
                itemKey = firstObjectKey(valItem);
                if (itemKey) {
                  const itemVal = valItem[itemKey];
                  itemId = itemVal ? itemVal.id : '';
                  if (itemId) {
                    const cacheKey = `${key}.${itemKey}::${itemId}`;
                    if (key === 'addChatItemAction' && itemId) return; // no need
                    if (cacheChatActions.has(cacheKey)) {
                      console.log('handleLiveChatAction Repeated Item', cacheKey);
                      return;
                    } else {
                      cacheChatActions.add(cacheKey);
                    }
                  }
                }
              }
              return this.handleLiveChatAction45(a);
            };
            console.log("AMEND_TICKER_handleLiveChatAction - OK (v2)");
          } else if (0 && do_amend_ticker_handleLiveChatAction
            && '|1.63.48|1.64.48|'.includes(`|${fnIntegrity(cProto.handleLiveChatAction)}|`)
            && fnIntegrity(cProto.handleLiveChatActions) === '1.23.12'
          ) {
            cProto.handleLiveChatActions45 = cProto.handleLiveChatActions;
            cProto.handleLiveChatActions = function (a) {
              /**
               *
                  f.handleLiveChatActions = function(a) {
                      a.length && (a.forEach(this.handleLiveChatAction, this),
                      this.updateHighlightedItem(),
                      this.shouldAnimateIn = !0)
                  }
               *
               */
              if (a.length) {
                const batchToken = String.fromCharCode(Date.now() % 26 + 97) + Math.floor(Math.random() * 19861 + 19861).toString(36);
                const len = a.length;
                if (FIX_BATCH_TICKER_ORDER && len >= 2) {
                  // Primarily for the initial batch, this is due to replayBuffer._back.
                  const entries = [];
                  const entriesI = [];
                  for (let i = 0; i < len; i++) {
                    const item = ((a[i] || 0).addLiveChatTickerItemAction || 0).item || 0;
                    if (item) {
                      const itemRendererKey = firstObjectKey(item);
                      const itemRenderer = item[itemRendererKey];
                      if (itemRenderer) {
                        let timestampUsec = getTimestampUsec(itemRenderer);
                        if (timestampUsec !== null) {
                          timestampUsec = parseInt(timestampUsec, 10);
                          if (timestampUsec > 0) {
                            entriesI.push(i);
                            entries.push({ e: a[i], timestampUsec })
                          }
                        }
                      }
                    }
                  }
                  const mLen = entries.length;
                  if (mLen >= 2) {
                    entries.sort((a, b) => {
                      const diff = a.timestampUsec - b.timestampUsec;
                      return diff > 0.1 ? 1 : diff < -0.1 ? -1 : 0;
                    });
                    for (let j = 0; j < mLen; j++) {
                      const i = entriesI[j];
                      a[i] = entries[j].e;
                    }
                  }
                  entries.length = 0;
                  entriesI.length = 0;
                }
                for (const action of a) {
                  action.__batchId45__ = batchToken;
                  this.handleLiveChatAction(action);
                }
              }
            }
            cProto.handleLiveChatAction45 = cProto.handleLiveChatAction;
            cProto._nszlv_ = 0;
            cProto._stackedLCAs_ = null;
            cProto._lastAddItem_ = null;
            cProto._lastAddItemInStack_ = false;
            cProto.handleLiveChatAction = function (a) {
              /**
               *
               *
                f.handleLiveChatAction = function(a) {
                    var b = C(a, xO)
                      , c = C(a, yO)
                      , d = C(a, o1a)
                      , e = C(a, p1a);
                    a = C(a, A1a);
                    b ? this.unshift("items", b.item) : c ? this.handleMarkChatItemAsDeletedAction(c) : d ? this.removeTickerItemById(d.targetItemId) : e ? this.handleMarkChatItemsByAuthorAsDeletedAction(e) : a && this.handleRemoveChatItemByAuthorAction(a)
                }
               *
               */
              // return this.handleLiveChatAction45(a)
              const { addChatItemAction, addLiveChatTickerItemAction, markChatItemAsDeletedAction,
                removeChatItemAction, markChatItemsByAuthorAsDeletedAction, removeChatItemByAuthorAction, __batchId45__ } = a
              if (addChatItemAction) return;
              const d = Date.now();
              // console.log(Object.keys(a));
              if (this._stackedLCAs_ === null) this._stackedLCAs_ = [];
              const stackArr = this._stackedLCAs_;
              let newStackEntry = null;
              if (addLiveChatTickerItemAction) {
                let isDuplicated = false;
                const newItem = addLiveChatTickerItemAction.item;
                const tickerType = firstObjectKey(newItem);
                if (!tickerType) return;
                const tickerItem = newItem[tickerType];
                const tickerId = tickerItem.id;
                if (!tickerId) return;
                if (this._lastAddItem_ && this._lastAddItem_.id === tickerId) {
                  let prevTickerItem = null;
                  if (this._lastAddItemInStack_) {
                    const entry = stackArr[stackArr.length - 1]; // only consider the last entry
                    if (entry && entry.action === 'addItem') {
                      prevTickerItem = entry.data; // only consider the first item;
                    }
                  } else {
                    prevTickerItem = this.items[0]; // only consider the first item;
                  }
                  if (prevTickerItem && prevTickerItem[tickerType]) {
                    if (prevTickerItem[tickerType].id === tickerId) {
                      isDuplicated = true;
                    }
                  }
                }
                if (!isDuplicated) {
                  this._lastAddItem_ = tickerItem;
                  this._lastAddItemInStack_ = true;
                  // console.log('newItem', newItem)
                  const item = newItem;
                  const key = firstObjectKey(item);
                  if (key) {
                    const itemRenderer = item[key] || 0;
                    if (itemRenderer.fullDurationSec > 0) {
                      itemRenderer.__actionAt__ = d;
                    }
                  }
                  newStackEntry = { action: 'addItem', data: newItem };
                } else {
                  console.log('handleLiveChatAction Repeated Item', tickerItem.id, tickerItem); // happen in both live and playback. Reason Unknown.
                  return;
                }
              } else {
                markChatItemAsDeletedAction && (newStackEntry = { action: 'mcItemD', data: markChatItemAsDeletedAction });
                removeChatItemAction && (newStackEntry = { action: 'removeItemById', data: removeChatItemAction.targetId });
                markChatItemsByAuthorAsDeletedAction && (newStackEntry = { action: 'mcItemAD', data: markChatItemsByAuthorAsDeletedAction });
                removeChatItemByAuthorAction && (newStackEntry = { action: 'removeItemA', data: removeChatItemByAuthorAction })
              }
              if (!newStackEntry) return;
              stackArr.push(newStackEntry);
              this._nszlv_++;
              if (this._nszlv_ > 1e9) this._nszlv_ = 9;
              const tid = this._nszlv_;
              newStackEntry.__batchId45__ = __batchId45__ || '';
              newStackEntry.dateTime = Date.now();
              foregroundPromiseFn().then(() => {
                if (tid !== this._nszlv_) return;
                const dateNow = Date.now(); // time difference to shift animation start time shall be considered. (pending)
                const stackArr = this._stackedLCAs_.slice(0);
                this._stackedLCAs_.length = 0;
                this._lastAddItemInStack_ = false;
                let lastDateTime = 0;
                let prevBatchId = '';
                const addItems = [];
                // const previousShouldAnimateIn = this.shouldAnimateIn;
                const addItemsFx = () => {
                  if (addItems.length >= 1) {
                    const eArr = addItems.slice(0);
                    addItems.length = 0;
                    if (ADJUST_TICKER_DURATION_ALIGN_RENDER_TIME) {
                      const arr = []; // size of arr <= size of eArr
                      const d = Date.now();
                      for (const item of eArr) {
                        const key = firstObjectKey(item);
                        if (key) {
                          const itemRenderer = item[key] || 0;
                          const { durationSec, fullDurationSec, __actionAt__ } = itemRenderer;
                          if (__actionAt__ > 0 && durationSec > 0 && fullDurationSec > 0) {
                            const offset = d - __actionAt__;
                            if (offset > 0 && typeof durationSec === 'number' && typeof fullDurationSec === 'number' && fullDurationSec >= durationSec) {
                              const adjustedDurationSec = durationSec - Math.floor(offset / 1000);
                              if (adjustedDurationSec < durationSec) { // prevent NaN
                                // console.log('adjustedDurationSec', adjustedDurationSec);
                                if (adjustedDurationSec > 0) {
                                  // console.log('offset Sec', Math.floor(offset / 1000));
                                  itemRenderer.durationSec = adjustedDurationSec;
                                } else {
                                  // if adjustedDurationSec equal 0 or invalid
                                  continue; // skip adding
                                }
                              }
                            }
                          }
                          if (fullDurationSec > 0 && durationSec < 1) continue; // fallback check
                        }
                        arr.push(item)
                        // arr.unshift(item);
                      }
                      // console.log(arr.slice(0))
                      this.unshift("items", ...arr);
                    } else {
                      this.unshift("items", ...eArr);
                    }
                  }
                }
                for (const entry of stackArr) {
                  const { action, data, dateTime, __batchId45__ } = entry;
                  const finishLastAction = (
                    (prevBatchId !== __batchId45__ && prevBatchId)
                    || (dateNow - lastDateTime >= 1000 && dateNow - dateTime < 1000)
                  );
                  const addPrevItems = addItems.length >= 1 && (finishLastAction || action !== 'addItem');
                  lastDateTime = dateTime;
                  prevBatchId = __batchId45__;
                  // if (dateNow - dateTime >= 1000 && this.shouldAnimateIn) this.shouldAnimateIn = false;
                  if (addPrevItems) {
                    addItemsFx();
                  }
                  // if (finishLastAction) {
                  //   this.updateHighlightedItem();
                  //   if (!this.shouldAnimateIn) this.shouldAnimateIn = true;
                  // }
                  if (action === 'addItem') addItems.unshift(data);
                  else if (action === 'mcItemD') this.handleMarkChatItemAsDeletedAction(data);
                  else if (action === 'removeItemById') this.removeTickerItemById(data);
                  else if (action === 'mcItemAD') this.handleMarkChatItemsByAuthorAsDeletedAction(data);
                  else if (action === 'removeItemA') this.handleRemoveChatItemByAuthorAction(data);
                }
                // if (previousShouldAnimateIn && !this.shouldAnimateIn) this.shouldAnimateIn = true;
                addItemsFx();
                // if (prevBatchId || dateNow - lastDateTime >= 1000) {
                //   this.updateHighlightedItem();
                //   if (!this.shouldAnimateIn) this.shouldAnimateIn = true;
                // }
              })
            }
            console.log("AMEND_TICKER_handleLiveChatAction - OK (v1)");
          } else {
            console.log("AMEND_TICKER_handleLiveChatAction - NG");
          }
          if (RAF_FIX_keepScrollClamped) {
            // to be improved
            if (typeof cProto.keepScrollClamped === 'function' && !cProto.keepScrollClamped72 && fnIntegrity(cProto.keepScrollClamped) === '0.17.10') {
              cProto.keepScrollClamped72 = cProto.keepScrollClamped;
              cProto.keepScrollClamped = function () {
                this._bound_keepScrollClamped = this._bound_keepScrollClamped || this.keepScrollClamped.bind(this);
                this.scrollClampRaf = requestAnimationFrame(this._bound_keepScrollClamped);
                this.maybeClampScroll()
              }
              console.log('RAF_FIX: keepScrollClamped', tag, "OK")
            } else {
              assertor(() => fnIntegrity(cProto.keepScrollClamped, '0.17.10'));
              console.log('RAF_FIX: keepScrollClamped', tag, "NG")
            }
          }
          if (RAF_FIX_scrollIncrementally && typeof cProto.startScrolling === 'function' && typeof cProto.scrollIncrementally === 'function' && fnIntegrity(cProto.startScrolling) === '1.43.31' && '|1.78.45|1.82.43|'.indexOf('|' + fnIntegrity(cProto.scrollIncrementally) + '|') >= 0) {
            // to be replaced by animator
            cProto.startScrolling = function (a) {
              this.scrollStopHandle && this.cancelAsync(this.scrollStopHandle);
              this.asyncHandle && cancelAnimationFrame(this.asyncHandle);
              this.lastFrameTimestamp = this.scrollStartTime = performance.now();
              this.scrollRatePixelsPerSecond = a;
              this._bound_scrollIncrementally = this._bound_scrollIncrementally || this.scrollIncrementally.bind(this);
              this.asyncHandle = requestAnimationFrame(this._bound_scrollIncrementally)
            };
            // related functions: startScrollBack, startScrollingLeft, startScrollingRight, etc.
            // 2024.03.26
            // https://www.youtube.com/s/desktop/436f2749/jsbin/live_chat_polymer.vflset/live_chat_polymer.js
            /*
                f.scrollIncrementally = function(a) {
                    var b = a - (this.lastFrameTimestamp || 0);
                    Q(this.hostElement).querySelector(this.tickerBarQuery).scrollLeft += b / 1E3 * (this.scrollRatePixelsPerSecond || 0);
                    this.maybeClampScroll();
                    this.updateArrows();
                    this.lastFrameTimestamp = a;
                    0 < Q(this.hostElement).querySelector(this.tickerBarQuery).scrollLeft || this.scrollRatePixelsPerSecond && 0 < this.scrollRatePixelsPerSecond ? this.asyncHandle = window.requestAnimationFrame(this.scrollIncrementally.bind(this)) : this.stopScrolling()
                }
            */
            cProto.__getTickerBarQuery__ = function () {
              const tickerBarQuery = this.tickerBarQuery === '#items' ? this.$.items : this.hostElement.querySelector(this.tickerBarQuery);
              return tickerBarQuery;
            }
            cProto.scrollIncrementally = (RAF_FIX_scrollIncrementally === 2) ? function (a) {
              const b = a - (this.lastFrameTimestamp || 0);
              const rate = this.scrollRatePixelsPerSecond
              const q = b / 1E3 * (rate || 0);
              const tickerBarQuery = this.__getTickerBarQuery__();
              const sl = tickerBarQuery.scrollLeft;
              // console.log(rate, sl, q)
              if (this.lastFrameTimestamp == this.scrollStartTime) {
              } else if (q > -1e-5 && q < 1e-5) {
              } else {
                let cond1 = sl > 0 && rate > 0 && q > 0;
                let cond2 = sl > 0 && rate < 0 && q < 0;
                let cond3 = sl < 1e-5 && sl > -1e-5 && rate > 0 && q > 0;
                if (cond1 || cond2 || cond3) {
                  tickerBarQuery.scrollLeft += q;
                  this.maybeClampScroll();
                  this.updateArrows();
                }
              }
              this.lastFrameTimestamp = a;
              this._bound_scrollIncrementally = this._bound_scrollIncrementally || this.scrollIncrementally.bind(this);
              0 < tickerBarQuery.scrollLeft || rate && 0 < rate ? this.asyncHandle = requestAnimationFrame(this._bound_scrollIncrementally) : this.stopScrolling()
            } : function (a) {
              const b = a - (this.lastFrameTimestamp || 0);
              const tickerBarQuery = this.__getTickerBarQuery__();
              tickerBarQuery.scrollLeft += b / 1E3 * (this.scrollRatePixelsPerSecond || 0);
              this.maybeClampScroll();
              this.updateArrows();
              this.lastFrameTimestamp = a;
              this._bound_scrollIncrementally = this._bound_scrollIncrementally || this.scrollIncrementally.bind(this);
              0 < tickerBarQuery.scrollLeft || this.scrollRatePixelsPerSecond && 0 < this.scrollRatePixelsPerSecond ? this.asyncHandle = requestAnimationFrame(this._bound_scrollIncrementally) : this.stopScrolling()
            };
            console.log(`RAF_FIX: scrollIncrementally${RAF_FIX_scrollIncrementally}`, tag, "OK")
          } else {
            assertor(() => fnIntegrity(cProto.startScrolling, '1.43.31'));
            assertor(() => fnIntegrity(cProto.scrollIncrementally, '1.82.43'));
            console.log('cProto.startScrolling', cProto.startScrolling);
            console.log('cProto.scrollIncrementally', cProto.scrollIncrementally);
            console.log('RAF_FIX: scrollIncrementally', tag, "NG")
          }
          if (CLOSE_TICKER_PINNED_MESSAGE_WHEN_HEADER_CLICKED && typeof cProto.attached === 'function' && !cProto.attached37 && typeof cProto.detached === 'function' && !cProto.detached37) {
            cProto.attached37 = cProto.attached;
            cProto.detached37 = cProto.detached;
            let naohzId = 0;
            cProto.__naohzId__ = 0;
            cProto.attached = function () {
              Promise.resolve().then(() => {
                const hostElement = this.hostElement || this;
                if (!(hostElement instanceof HTMLElement)) return;
                if (!HTMLElement.prototype.matches.call(hostElement, '.yt-live-chat-renderer')) return;
                const ironPage = HTMLElement.prototype.closest.call(hostElement, 'iron-pages.yt-live-chat-renderer');
                // or #chat-messages
                if (!ironPage) return;
                if (this.__naohzId__) removeEventListener.call(ironPage, 'click', this.messageBoxClickHandlerForFade, { capture: false, passive: true });
                if (naohzId > 1e9) naohzId = naohzId % 1e4;
                this.__naohzId__ = ++naohzId;
                ironPage.setAttribute('naohz', `${+this.__naohzId__}`);
                addEventListener.call(ironPage, 'click', this.messageBoxClickHandlerForFade, { capture: false, passive: true });
              });
              return this.attached37.apply(this, arguments);
            };
            cProto.detached = function () {
              Promise.resolve().then(() => {
                const ironPage = document.querySelector(`iron-pages[naohz="${+this.__naohzId__}"]`);
                if (!ironPage) return;
                removeEventListener.call(ironPage, 'click', this.messageBoxClickHandlerForFade, { capture: false, passive: true });
              });
              return this.detached37.apply(this, arguments);
            };
            const clickFade = (u) => {
              u.click();
            };
            cProto.messageBoxClickHandlerForFade = async (evt) => {
              const target = (evt || 0).target || 0;
              if (!target) return;
              for (let p = target; p instanceof HTMLElement; p = nodeParent(p)) {
                const is = p.is;
                if (typeof is === 'string' && is) {
                  if (is === 'yt-live-chat-pinned-message-renderer') {
                    return;
                  }
                  if (is === 'iron-pages' || is === 'yt-live-chat-renderer' || is === 'yt-live-chat-app') {
                    const fade = HTMLElement.prototype.querySelector.call(p, 'yt-live-chat-pinned-message-renderer:not([hidden]) #fade');
                    if (fade) {
                      Promise.resolve(fade).then(clickFade);
                      evt && evt.stopPropagation();
                    }
                    return;
                  }
                  if (is !== 'yt-live-chat-ticker-renderer') {
                    if (is.startsWith('yt-live-chat-ticker-')) return;
                    if (!is.endsWith('-renderer')) return;
                  }
                } else {
                  if ((p.nodeName || '').includes('BUTTON')) return;
                }
              }
            };
            console.log("CLOSE_TICKER_PINNED_MESSAGE_WHEN_HEADER_CLICKED - OK")
          } else {
            console.log("CLOSE_TICKER_PINNED_MESSAGE_WHEN_HEADER_CLICKED - NG")
          }
        })();
        console.log("[End]");
        console.groupEnd();
      }).catch(console.warn);
      if (ENABLE_RAF_HACK_INPUT_RENDERER || DELAY_FOCUSEDCHANGED) {
        customElements.whenDefined("yt-live-chat-message-input-renderer").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-message-input-renderer hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-live-chat-message-input-renderer"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (ENABLE_RAF_HACK_INPUT_RENDERER && rafHub !== null) {
              let doHack = false;
              if (typeof cProto.handleTimeout === 'function' && typeof cProto.updateTimeout === 'function') {
                // not cancellable
                doHack = fnIntegrity(cProto.handleTimeout, '1.27.16') && fnIntegrity(cProto.updateTimeout, '1.50.33');
              }
              if (doHack) {
                cProto.handleTimeout = function (a) {
                  console.log('cProto.handleTimeout', tag)
                  if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
                  this.timeoutDurationMs = this.timeoutMs = a;
                  this.countdownRatio = 1;
                  0 === this.lastTimeoutTimeMs && rafHub.request(this.boundUpdateTimeout38_)
                };
                cProto.updateTimeout = function (a) {
                  console.log('cProto.updateTimeout', tag)
                  if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
                  this.lastTimeoutTimeMs && (this.timeoutMs = Math.max(0, this.timeoutMs - (a - this.lastTimeoutTimeMs)),
                    this.countdownRatio = this.timeoutMs / this.timeoutDurationMs);
                  this.isAttached && this.timeoutMs ? (this.lastTimeoutTimeMs = a,
                    rafHub.request(this.boundUpdateTimeout38_)) : this.lastTimeoutTimeMs = 0
                };
                console.log('RAF_HACK_INPUT_RENDERER', tag, "OK")
              } else {
                console.log('typeof handleTimeout', typeof cProto.handleTimeout)
                console.log('typeof updateTimeout', typeof cProto.updateTimeout)
                console.log('RAF_HACK_INPUT_RENDERER', tag, "NG")
              }
            }
            if (DELAY_FOCUSEDCHANGED && typeof cProto.onFocusedChanged === 'function' && cProto.onFocusedChanged.length === 1 && !cProto.onFocusedChanged372) {
              cProto.onFocusedChanged372 = cProto.onFocusedChanged;
              cProto.onFocusedChanged = function (a) {
                Promise.resolve().then(() => {
                  if (this.isAttached === true) this.onFocusedChanged372(a);
                }).catch(console.warn);
              }
            }
          })();
          console.log("[End]");
          console.groupEnd();
        })
      }
      if (ENABLE_RAF_HACK_EMOJI_PICKER && rafHub !== null) {
        customElements.whenDefined("yt-emoji-picker-renderer").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-emoji-picker-renderer hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-emoji-picker-renderer"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            let doHack = false;
            if (typeof cProto.animateScroll_ === 'function') {
              // not cancellable
              console.log('animateScroll_', typeof cProto.animateScroll_)
              doHack = fnIntegrity(cProto.animateScroll_, '1.102.49')
            }
            if (doHack) {
              const querySelector = HTMLElement.prototype.querySelector;
              const U = (element) => ({
                querySelector: (selector) => querySelector.call(element, selector)
              });
              cProto.animateScroll_ = function (a) {
                // console.log('cProto.animateScroll_', tag) // yt-emoji-picker-renderer
                if (!this.boundAnimateScroll39_) this.boundAnimateScroll39_ = this.animateScroll_.bind(this);
                this.lastAnimationTime_ || (this.lastAnimationTime_ = a);
                a -= this.lastAnimationTime_;
                200 > a ? (U(this.hostElement).querySelector("#categories").scrollTop = this.animationStart_ + (this.animationEnd_ - this.animationStart_) * a / 200,
                  rafHub.request(this.boundAnimateScroll39_)) : (null != this.animationEnd_ && (U(this.hostElement).querySelector("#categories").scrollTop = this.animationEnd_),
                    this.animationEnd_ = this.animationStart_ = null,
                    this.lastAnimationTime_ = 0);
                this.updateButtons_()
              }
              console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "OK")
            } else {
              console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "NG")
            }
          })();
          console.log("[End]");
          console.groupEnd();
        });
      }
      if (ENABLE_RAF_HACK_DOCKED_MESSAGE && rafHub !== null) {
        customElements.whenDefined("yt-live-chat-docked-message").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-docked-message hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-live-chat-docked-message"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            let doHack = false;
            if (typeof cProto.detached === 'function' && typeof cProto.checkIntersections === 'function' && typeof cProto.onDockableMessagesChanged === 'function' && typeof cProto.boundCheckIntersections === 'undefined') {
              // cancelable - this.intersectRAF <detached>
              // yt-live-chat-docked-message
              // boundCheckIntersections <-> checkIntersections
              // onDockableMessagesChanged
              //  this.intersectRAF = window.requestAnimationFrame(this.boundCheckIntersections);
              console.log('detached', typeof cProto.detached)
              console.log('checkIntersections', typeof cProto.checkIntersections)
              console.log('onDockableMessagesChanged', typeof cProto.onDockableMessagesChanged)
              doHack = fnIntegrity(cProto.detached, '0.32.22') && fnIntegrity(cProto.checkIntersections, '0.128.85') && fnIntegrity(cProto.onDockableMessagesChanged, '0.20.11')
            }
            if (doHack) {
              cProto.checkIntersections = function () {
                // console.log('cProto.checkIntersections', tag)
                if (this.dockableMessages.length) {
                  this.intersectRAF = rafHub.request(this.boundCheckIntersections);
                  let a = this.dockableMessages[0]
                    , b = this.hostElement.getBoundingClientRect();
                  a = a.getBoundingClientRect();
                  let c = a.top - b.top
                    , d = 8 >= c;
                  c = 8 >= c - this.hostElement.clientHeight;
                  if (d) {
                    let e;
                    for (; d;) {
                      e = this.dockableMessages.shift();
                      d = this.dockableMessages[0];
                      if (!d)
                        break;
                      d = d.getBoundingClientRect();
                      c = d.top - b.top;
                      let f = 8 >= c;
                      if (8 >= c - a.height)
                        if (f)
                          a = d;
                        else
                          return;
                      d = f
                    }
                    this.dock(e)
                  } else
                    c && this.dockedItem && this.clear()
                } else
                  this.intersectRAF = 0
              }
              cProto.onDockableMessagesChanged = function () {
                // console.log('cProto.onDockableMessagesChanged', tag) // yt-live-chat-docked-message
                this.dockableMessages.length && !this.intersectRAF && (this.intersectRAF = rafHub.request(this.boundCheckIntersections))
              }
              cProto.detached = function () {
                this.intersectRAF && rafHub.cancel(this.intersectRAF)
              }
              console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "OK")
            } else {
              console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "NG")
            }
          })();
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
      }
      if (FIX_SETSRC_AND_THUMBNAILCHANGE_) {
        customElements.whenDefined("yt-img-shadow").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-img-shadow hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-img-shadow"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (typeof cProto.thumbnailChanged_ === 'function' && !cProto.thumbnailChanged66_) {
              cProto.thumbnailChanged66_ = cProto.thumbnailChanged_;
              cProto.thumbnailChanged_ = function (a) {
                if (this.oldThumbnail_ && this.thumbnail && this.oldThumbnail_.thumbnails === this.thumbnail.thumbnails) return;
                if (!this.oldThumbnail_ && !this.thumbnail) return;
                return this.thumbnailChanged66_.apply(this, arguments)
              }
              console.log("cProto.thumbnailChanged_ - OK");
            } else {
              console.log("cProto.thumbnailChanged_ - NG");
            }
            if (typeof cProto.setSrc_ === 'function' && !cProto.setSrc66_) {
              cProto.setSrc66_ = cProto.setSrc_;
              cProto.setSrc_ = function (a) {
                if ((((this || 0).$ || 0).img || 0).src === a) return;
                return this.setSrc66_.apply(this, arguments)
              }
              console.log("cProto.setSrc_ - OK");
            } else {
              console.log("cProto.setSrc_ - NG");
            }
          })();
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
      }
      if (FIX_THUMBNAIL_DATACHANGED) {
        customElements.whenDefined("yt-live-chat-author-badge-renderer").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-author-badge-renderer hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-live-chat-author-badge-renderer"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (typeof cProto.dataChanged === 'function' && !cProto.dataChanged86 && '|1.160.97|1.159.97|'.includes(`|${fnIntegrity(cProto.dataChanged)}|`)) {
              cProto.dataChanged86 = cProto.dataChanged;
              cProto.dataChanged = function (a) {
                /*
                  for (var b = xC(Z(this.hostElement).querySelector("#image")); b.firstChild; )
                      b.removeChild(b.firstChild);
                  if (a)
                      if (a.icon) {
                          var c = document.createElement("yt-icon");
                          "MODERATOR" === a.icon.iconType && this.enableNewModeratorBadge ? (c.icon = "yt-sys-icons:shield-filled",
                          c.defaultToFilled = !0) : c.icon = "live-chat-badges:" + a.icon.iconType.toLowerCase();
                          b.appendChild(c)
                      } else if (a.customThumbnail) {
                          c = document.createElement("img");
                          var d;
                          (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null) ? (c.src = d,
                          b.appendChild(c),
                          c.setAttribute("alt", this.hostElement.ariaLabel || "")) : lq(new tm("Could not compute URL for thumbnail",a.customThumbnail))
                      }
                */
                const image = ((this || 0).$ || 0).image
                if (image && a && image.firstElementChild) {
                  let exisiting = image.firstElementChild;
                  if (exisiting === image.lastElementChild) {
                    if (a.icon && exisiting.nodeName.toUpperCase() === 'YT-ICON') {
                      let c = exisiting;
                      if ("MODERATOR" === a.icon.iconType && this.enableNewModeratorBadge) {
                        if (c.icon !== "yt-sys-icons:shield-filled") c.icon = "yt-sys-icons:shield-filled";
                        if (c.defaultToFilled !== true) c.defaultToFilled = true;
                      } else {
                        let p = "live-chat-badges:" + a.icon.iconType.toLowerCase();;
                        if (c.icon !== p) c.icon = p;
                        if (c.defaultToFilled !== false) c.defaultToFilled = false;
                      }
                      return;
                    } else if (a.customThumbnail && exisiting.nodeName.toUpperCase() == 'IMG') {
                      let c = exisiting;
                      if (a.customThumbnail.thumbnails.map(e => e.url).includes(c.src)) {
                        c.setAttribute("alt", this.hostElement.ariaLabel || "");
                        return;
                      }
                      /*
                      var d;
                      (d = (d = KC(a.customThumbnail.thumbnails, 16)) ? lc(oc(d)) : null) ? (c.src = d,
                        c.setAttribute("alt", this.hostElement.ariaLabel || "")) : lq(new tm("Could not compute URL for thumbnail", a.customThumbnail))
                        */
                    }
                  }
                }
                return this.dataChanged86.apply(this, arguments)
              }
              console.log("cProto.dataChanged - OK");
            } else {
              assertor(() => fnIntegrity(cProto.dataChanged, '1.160.97'));
              console.log("cProto.dataChanged - NG");
            }
          })();
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
      }
      if (FIX_TOOLTIP_DISPLAY) {
        customElements.whenDefined("tp-yt-paper-tooltip").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | tp-yt-paper-tooltip hacks");
          console.log("[Begin]");
          (() => {
            const tag = "tp-yt-paper-tooltip"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (typeof cProto.attached === 'function' && typeof cProto.detached === 'function' && cProto._readyClients && cProto._attachDom && cProto.ready && !cProto._readyClients43) {
              cProto._readyClients43 = cProto._readyClients;
              cProto._readyClients = function () {
                let r = cProto._readyClients43.apply(this, arguments);
                if (this.$ && this.$$ && this.$.tooltip) this.root = null; // fix this.root = null != (b = a.root) ? b : this.host
                return r;
              }
              console.log("_readyClients - OK");
            } else {
              console.log("_readyClients - NG");
            }
            if (typeof cProto.show === 'function' && !cProto.show17) {
              cProto.show17 = cProto.show;
              cProto.show = function () {
                let r = this.show17.apply(this, arguments);
                this._showing === true && Promise.resolve().then(() => {
                  const tooltip = (this.$ || 0).tooltip;
                  if (tooltip && tooltip.firstElementChild === null) {
                    let text = tooltip.textContent;
                    if (typeof text === 'string' && text.length >= 2) {
                      tooltip.textContent = text.trim();
                    }
                  }
                }).catch(console.warn)
                return r;
              }
              console.log("trim tooltip content - OK");
            } else {
              console.log("trim tooltip content - NG");
            }
            /*
            cProto.updatePosition61 = cProto.updatePosition;
            cProto.updatePosition = function () {
              if (this._target && this.offsetParent) {
                var a = this.offset;
                14 != this.marginTop && 14 == this.offset && (a = this.marginTop);
                var b = this.offsetParent.getBoundingClientRect()
                  , c = this._target.getBoundingClientRect()
                  , d = this.getBoundingClientRect()
                  , e = (c.width - d.width) / 2
                  , h = (c.height - d.height) / 2
                  , l = c.left - b.left
                  , m = c.top - b.top;
                switch (this.position) {
                  case "top":
                    var p = l + e;
                    var q = m - d.height - a;
                    break;
                  case "bottom":
                    p = l + e;
                    q = m + c.height + a;
                    break;
                  case "left":
                    p = l - d.width - a;
                    q = m + h;
                    break;
                  case "right":
                    p = l + c.width + a,
                      q = m + h;
                }
              if(this.ascee) {
                this.fitToVisibleBounds = false;
              }
                this.fitToVisibleBounds ? (b.left + p + d.width > window.innerWidth ? (this.style.right = "0px",
                  this.style.left = "auto") : (this.style.left = Math.max(0, p) + "px",
                    this.style.right = "auto"),
                  b.top + q + d.height > window.innerHeight ? (this.style.bottom = b.height + "px",
                    this.style.top = "auto") : (this.style.top = Math.max(-b.top, q) + "px",
                      this.style.bottom = "auto")) : (this.style.left = p + "px",
                        this.style.top = q + "px")
              }
            }
            cProto.updateStyles61 = cProto.updateStyles;
            cProto.updateStyles= function(){
              if(this.ascee) return;
              return this.updateStyles61.apply(this,arguments);
            }
            */
          })();
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
      }
      if (FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK) {
        const hookDocumentMouseDownSetupFn = () => {
          let muzTimestamp = 0;
          let nszDropdown = null;
          const handlerObject = {
            // mdHandler282 : function (evt) {
            //   // console.log(evt, 1, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
            //   if (!evt || !evt.isTrusted) return;
            //   muzTimestamp = 0;
            //   nszDropdown = null;
            //   const hostElement = this.hostElement || this;
            //   if (!evt || !evt.isTrusted || !hostElement.hasAttribute('menu-visible')) return;
            //   if (!hostElement.contains(evt.target)) return;
            //   let targetDropDown = null;
            //   for(const dropdown of document.querySelectorAll('tp-yt-iron-dropdown.style-scope.yt-live-chat-app')){
            //     if(dropdown && dropdown.positionTarget && hostElement.contains( dropdown.positionTarget)){
            //       targetDropDown = dropdown;
            //     }
            //   }
            //   if ((nszDropdown = targetDropDown)) {
            //     muzTimestamp = Date.now();
            //     evt.stopImmediatePropagation();
            //     evt.stopPropagation();
            //   }
            // },
            muHandler282: function (evt) {
              // console.log(evt, 7, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
              if (!evt || !evt.isTrusted || !muzTimestamp) return;
              const dropdown = nszDropdown;
              muzTimestamp = 0;
              nszDropdown = null;
              const kurMPC = kRef(currentMenuPivotWR) || 0;
              const hostElement = kurMPC.hostElement || kurMPC;
              if (!hostElement.hasAttribute('menu-visible')) return;
              const chatBanner = HTMLElement.prototype.closest.call(hostElement, 'yt-live-chat-banner-renderer') || 0;
              if (chatBanner) return;
              if (dropdown && dropdown.positionTarget && hostElement.contains(dropdown.positionTarget)) {
                /*
                const parentButton = HTMLElement.prototype.closest.call(evt.target, 'button, yt-icon, yt-icon-shape, icon-shape');
                if(parentButton) return;
                */
                muzTimestamp = Date.now();
                evt.stopImmediatePropagation();
                evt.stopPropagation();
                Promise.resolve(dropdown).then((dropdown) => {
                  dropdown.cancel();
                });
                // document.body.click();
              }
            },
            mlHandler282: function (evt) {
              muzTimestamp = 0;
              nszDropdown = null;
            },
            ckHandler282: function (evt) {
              // console.log(evt, 3, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
              if (!evt || !evt.isTrusted || !muzTimestamp) return;
              if (Date.now() - muzTimestamp < 40) {
                /*
                const parentButton = HTMLElement.prototype.closest.call(evt.target, 'button, yt-icon, yt-icon-shape, icon-shape');
                if(parentButton) return;
                */
                muzTimestamp = Date.now();
                evt.stopImmediatePropagation();
                evt.stopPropagation();
              }
            },
            tapHandler282: function (evt) {
              // console.log(evt, 2, document.querySelector('tp-yt-iron-dropdown[focused].style-scope.yt-live-chat-app'))
              if (!evt || !evt.isTrusted || !muzTimestamp) return;
              if (Date.now() - muzTimestamp < 40) {
                /*
                const parentButton = HTMLElement.prototype.closest.call(evt.target, 'button, yt-icon, yt-icon-shape, icon-shape');
                if(parentButton) return;
                */
                muzTimestamp = Date.now();
                evt.stopImmediatePropagation();
                evt.stopPropagation();
              }
            },
            handleEvent(evt) {
              if (evt) {
                const kurMPC = kRef(currentMenuPivotWR) || 0;
                const cnt = insp(kurMPC);
                const hostElement = cnt.hostElement || cnt;
                if (!cnt || cnt.isAttached !== true || hostElement.isConnected !== true) return;
                switch (evt.type) {
                  // case 'mousedown':
                  // return this.mdHandler282.call(kurMPC, evt);
                  case 'mouseup':
                    return this.muHandler282(evt);
                  case 'mouseleave':
                    return this.mlHandler282(evt);
                  case 'tap':
                    return this.tapHandler282(evt);
                  case 'click':
                    return this.ckHandler282(evt);
                }
              }
            }
          }
          document.addEventListener('mousedown', function (evt) {
            if (!evt || !evt.isTrusted || !evt.target) return;
            muzTimestamp = 0;
            nszDropdown = null;
            /*
            const parentButton = HTMLElement.prototype.closest.call(evt.target, 'button, yt-icon, yt-icon-shape, icon-shape');
            if(parentButton){
              const kurMPC = HTMLElement.prototype.closest.call(parentButton, '[whole-message-clickable]') || 0;
              if(kurMPC){
                evt.preventDefault();
                evt.stopImmediatePropagation();
                evt.stopPropagation();
              }
              return;
            }
            */
            /** @type {HTMLElement | null} */
            const kurMP = kRef(currentMenuPivotWR);
            if (!kurMP) return;
            const kurMPC = HTMLElement.prototype.closest.call(kurMP, '[menu-visible]') || 0;
            if (!kurMPC || !kurMPC.hasAttribute('whole-message-clickable')) return;
            if (!kurMPC.isClickableChatRow111 || !kurMPC.isClickableChatRow111() || !HTMLElement.prototype.contains.call(kurMPC, evt.target)) return;
            const chatBanner = HTMLElement.prototype.closest.call(kurMPC, 'yt-live-chat-banner-renderer') || 0;
            if (chatBanner) return;
            let targetDropDown = null;
            for (const dropdown of document.querySelectorAll('tp-yt-iron-dropdown.style-scope.yt-live-chat-app')) {
              if (dropdown && dropdown.positionTarget === kurMP) {
                targetDropDown = dropdown;
              }
            }
            if (!targetDropDown) return;
            /*
            if (parentButton) {
              evt.preventDefault();
              evt.stopImmediatePropagation();
              evt.stopPropagation();
              currentMenuPivotWR = mWeakRef(kurMPC);
              return;
            }
            */
            if ((nszDropdown = targetDropDown)) {
              muzTimestamp = Date.now();
              evt.stopImmediatePropagation();
              evt.stopPropagation();
              currentMenuPivotWR = mWeakRef(kurMPC);
              const listenOpts = { capture: true, passive: false, once: true };
              // remove unexcecuted eventHandler
              document.removeEventListener('mouseup', handlerObject, listenOpts);
              document.removeEventListener('mouseleave', handlerObject, listenOpts);
              document.removeEventListener('tap', handlerObject, listenOpts);
              document.removeEventListener('click', handlerObject, listenOpts);
              // inject one time eventHandler to by pass events
              document.addEventListener('mouseup', handlerObject, listenOpts);
              document.addEventListener('mouseleave', handlerObject, listenOpts);
              document.addEventListener('tap', handlerObject, listenOpts);
              document.addEventListener('click', handlerObject, listenOpts);
            }
          }, true);
        }
        // yt-live-chat-paid-message-renderer ??
        /*
        [...(new Set([...document.querySelectorAll('*')].filter(e=>e.is&&('shouldSupportWholeItemClick' in e)).map(e=>e.is))).keys()]
        "yt-live-chat-ticker-paid-message-item-renderer"
        "yt-live-chat-ticker-paid-sticker-item-renderer"
        "yt-live-chat-paid-message-renderer"
        "yt-live-chat-text-message-renderer"
        "yt-live-chat-paid-sticker-renderer"
        */
        whenDefinedMultiple([
          "yt-live-chat-paid-message-renderer",
          "yt-live-chat-membership-item-renderer",
          "yt-live-chat-paid-sticker-renderer",
          "yt-live-chat-text-message-renderer",
          "yt-live-chat-auto-mod-message-renderer",
          /*
          "yt-live-chat-ticker-paid-message-item-renderer",
          "yt-live-chat-ticker-paid-sticker-item-renderer",
          "yt-live-chat-paid-message-renderer",
          "yt-live-chat-text-message-renderer",
          "yt-live-chat-paid-sticker-renderer",
          "yt-live-chat-ticker-sponsor-item-renderer",
          "yt-live-chat-banner-header-renderer",
          "ytd-sponsorships-live-chat-gift-purchase-announcement-renderer",
          "ytd-sponsorships-live-chat-header-renderer",
          "ytd-sponsorships-live-chat-gift-redemption-announcement-renderer",
          "yt-live-chat-auto-mod-message-renderer",
          "yt-live-chat-text-message-renderer",
          "yt-live-chat-paid-message-renderer",
          "yt-live-chat-legacy-paid-message-renderer",
          "yt-live-chat-membership-item-renderer",
          "yt-live-chat-paid-sticker-renderer",
          "yt-live-chat-donation-announcement-renderer",
          "yt-live-chat-moderation-message-renderer",
          "ytd-sponsorships-live-chat-gift-purchase-announcement-renderer",
          "ytd-sponsorships-live-chat-gift-redemption-announcement-renderer",
          "yt-live-chat-viewer-engagement-message-renderer",
          */
        ]).then(sTags => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-message-renderer(s)... hacks");
          console.log("[Begin]");
          let doMouseHook = false;
          const dProto = {
            isClickableChatRow111: function () {
              return (
                this.data && typeof this.shouldSupportWholeItemClick === 'function' && typeof this.hasModerationOverlayVisible === 'function' &&
                this.data.contextMenuEndpoint && this.wholeMessageClickable && this.shouldSupportWholeItemClick() && !this.hasModerationOverlayVisible()
              ); // follow .onItemTap(a)
            }
          };
          for (const sTag of sTags) { // ##tag##
            (() => {
              const tag = sTag;
              const dummy = document.createElement(tag);
              const cProto = getProto(dummy);
              if (!cProto || !cProto.attached) {
                console.warn(`proto.attached for ${tag} is unavailable.`);
                return;
              }
              const dCnt = insp(dummy);
              if ('wholeMessageClickable' in dCnt && typeof dCnt.hasModerationOverlayVisible === 'function' && typeof dCnt.shouldSupportWholeItemClick === 'function') {
                cProto.isClickableChatRow111 = dProto.isClickableChatRow111;
                const toHookDocumentMouseDown = typeof cProto.shouldSupportWholeItemClick === 'function' && typeof cProto.hasModerationOverlayVisible === 'function';
                if (toHookDocumentMouseDown) {
                  doMouseHook = true;
                }
                console.log("shouldSupportWholeItemClick Y", tag);
              } else {
                console.log("shouldSupportWholeItemClick N", tag);
              }
            })();
          }
          if (doMouseHook) {
            hookDocumentMouseDownSetupFn();
            console.log("FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK - Doc MouseEvent OK");
          }
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
        // https://www.youtube.com/watch?v=oQzFi1NO7io
      }
      if (NO_ITEM_TAP_FOR_NON_STATIONARY_TAP) {
        let targetElementCntWR = null;
        let _e0 = null;
        document.addEventListener('mousedown', (e) => {
          if (!e || !e.isTrusted) return;
          let element = e.target;
          for (; element instanceof HTMLElement; element = element.parentNode) {
            if (element.is) break;
          }
          if (!element || !element.is) return;
          const cnt = insp(element);
          if (typeof cnt.onItemTap === 'function') {
            cnt._onItemTap_isNonStationary = 0;
            const cProto = getProto(element);
            if (!cProto.onItemTap366 && typeof cProto.onItemTap === 'function' && cProto.onItemTap.length === 1) {
              cProto.onItemTap366 = cProto.onItemTap;
              cProto.onItemTap = function (a) {
                const t = this._onItemTap_isNonStationary;
                this._onItemTap_isNonStationary = 0;
                if (t > Date.now()) return;
                return this.onItemTap366.apply(this, arguments)
              }
            }
            _e0 = e;
            targetElementCntWR = mWeakRef(cnt);
          } else {
            _e0 = null;
            targetElementCntWR = null;
          }
        }, { capture: true, passive: true });
        document.addEventListener('mouseup', (e) => {
          if (!e || !e.isTrusted) return;
          const e0 = _e0;
          _e0 = null;
          if (!e0) return;
          const cnt = kRef(targetElementCntWR);
          targetElementCntWR = null;
          if (!cnt) return;
          if (e.timeStamp - e0.timeStamp > TAP_ACTION_DURATION) {
            cnt._onItemTap_isNonStationary = Date.now() + 40;
          } else if ((window.getSelection() + "").trim().replace(/[\u2000-\u200a\u202f\u2800\u200B\u200C\u200D\uFEFF]+/g, '').length >= 1) {
            cnt._onItemTap_isNonStationary = Date.now() + 40;
          } else {
            const dx = e.clientX - e0.clientX;
            const dy = e.clientY - e0.clientY;
            const dd = Math.sqrt(dx * dx + dy * dy);
            const ddmm = px2mm(dd);
            if (ddmm > 1.0) {
              cnt._onItemTap_isNonStationary = Date.now() + 40;
            } else {
              cnt._onItemTap_isNonStationary = 0;
            }
          }
        }, { capture: true, passive: true });
      }
      const __showContextMenu_assign_lock_with_external_unlock_ = function (targetCnt) {
        let rr = null;
        const p1 = new Promise(resolve => {
          rr = resolve;
        });
        const p1unlock = () => {
          const f = rr;
          if (f) {
            rr = null;
            f();
          }
        }
        return {
          p1,
          p1unlock,
          assignLock: (targetCnt, timeout) => {
            targetCnt.__showContextMenu_assign_lock__(p1);
            if (timeout) setTimeout(p1unlock, timeout);
          }
        }
      }
      if (PREREQUEST_CONTEXT_MENU_ON_MOUSE_DOWN) {
        document.addEventListener('mousedown', function (evt) {
          const maxloopDOMTreeElements = 4;
          const maxloopYtCompontents = 4;
          let j1 = 0;
          let j2 = 0;
          let target = (evt || 0).target || 0;
          if (!target) return;
          while (target instanceof HTMLElement) {
            if (++j1 > maxloopDOMTreeElements) break;
            if (typeof (target.is || insp(target).is || null) === 'string') break;
            target = nodeParent(target);
          }
          const components = [];
          while (target instanceof HTMLElement) {
            if (++j2 > maxloopYtCompontents) break;
            const cnt = insp(target);
            if (typeof (target.is || cnt.is || null) === 'string') {
              components.push(target);
            }
            if (typeof cnt.showContextMenu === 'function') break;
            target = target.parentComponent || cnt.parentComponent || null;
          }
          if (!(target instanceof HTMLElement)) return;
          const targetCnt = insp(target);
          if (typeof targetCnt.handleGetContextMenuResponse_ !== 'function' || typeof targetCnt.handleGetContextMenuError !== 'function') {
            console.log('Error Found: handleGetContextMenuResponse_ OR handleGetContextMenuError is not defined on a component with showContextMenu')
            return;
          }
          const endpoint = (targetCnt.data || 0).contextMenuEndpoint
          if (!endpoint) return;
          if (targetCnt.opened || !targetCnt.isAttached) return;
          if (typeof targetCnt.__cacheResolvedEndpointData__ !== 'function') {
            console.log(`preRequest for showContextMenu in ${targetCnt.is} is not yet supported.`)
          }
          const targetDollar = indr(target);
          let doPreRequest = false;
          if (components.length >= 2 && components[0].id === 'menu-button' && (targetDollar || 0)['menu-button'] === components[0]) {
            doPreRequest = true;
          } else if (components.length === 1 && components[0] === target) {
            doPreRequest = true;
          } else if (components.length >= 2 && components[0].id === 'author-photo' && (targetDollar || 0)['author-photo'] === components[0]) {
            doPreRequest = true;
          }
          if (doPreRequest === false) {
            console.log('doPreRequest = fasle on showContextMenu', components);
            return;
          }
          if (typeof targetCnt.__getCachedEndpointData__ !== 'function' || targetCnt.__getCachedEndpointData__(endpoint)) return;
          if ((typeof targetCnt.__showContextMenu_mutex_unlock_isEmpty__ === 'function') && !targetCnt.__showContextMenu_mutex_unlock_isEmpty__()) {
            console.log('preRequest on showContextMenu aborted due to stacked network request');
            return;
          }
          const onSuccess = (a) => {
            /*
              dQ() && (a = a.response);
              a.liveChatItemContextMenuSupportedRenderers && a.liveChatItemContextMenuSupportedRenderers.menuRenderer && this.showContextMenu_(a.liveChatItemContextMenuSupportedRenderers.menuRenderer);
              a.actions && Eu(this.hostElement, "yt-live-chat-actions", [a.actions])
            */
            a = a.response || a;
            if (!a) {
              console.log('unexpected error in prerequest for showContextMenu.onSuccess');
              return;
            }
            let z = null;
            a.liveChatItemContextMenuSupportedRenderers && a.liveChatItemContextMenuSupportedRenderers.menuRenderer && (z = a.liveChatItemContextMenuSupportedRenderers.menuRenderer);
            if (z) {
              a = z;
              targetCnt.__cacheResolvedEndpointData__(endpoint, a, true);
            }
          };
          const onFailure = (a) => {
            /*
              if (a instanceof Error || a instanceof Object || a instanceof String)
                  var b = a;
              hq(new xm("Error encountered calling GetLiveChatItemContextMenu",b))
            */
            targetCnt.__cacheResolvedEndpointData__(endpoint, null);
            // console.log('onFailure', a)
          };
          if (doPreRequest) {
            let propertyCounter = 0;
            const pm1 = __showContextMenu_assign_lock_with_external_unlock_(targetCnt);
            const p1Timeout = 800;
            const proxyKey = '__$$__proxy_to_this__$$__' + Date.now();
            try {
              const onSuccessHelperFn = function () {
                pm1.p1unlock();
                if (propertyCounter !== 5) {
                  console.log('Error in prerequest for showContextMenu.onSuccessHelperFn')
                  return;
                }
                if (this[proxyKey] !== targetCnt) {
                  console.log('Error in prerequest for showContextMenu.this');
                  return;
                }
                onSuccess(...arguments);
              };
              const onFailureHelperFn = function () {
                pm1.p1unlock();
                if (propertyCounter !== 5) {
                  console.log('Error in prerequest for showContextMenu.onFailureHelperFn')
                  return;
                }
                if (this[proxyKey] !== targetCnt) {
                  console.log('Error in prerequest for showContextMenu.this');
                  return;
                }
                onFailure(...arguments);
              }
              const fakeTargetCnt = new Proxy({
                __showContextMenu_forceNativeRequest__: 1,
                __showContextMenu_sync_mode_request__: 1,
                get handleGetContextMenuResponse_() {
                  propertyCounter += 2;
                  return onSuccessHelperFn;
                },
                get handleGetContextMenuError() {
                  propertyCounter += 3;
                  return onFailureHelperFn;
                }
              }, {
                get(_, key, receiver) {
                  if (key in _) return _[key];
                  if (key === proxyKey) return targetCnt;
                  let giveNative = false;
                  if (key in targetCnt) {
                    if (key === 'data') giveNative = true;
                    else if (typeof targetCnt[key] === 'function') giveNative = true;
                  }
                  if (giveNative) return targetCnt[key];
                }
              });
              const fakeEvent = (() => {
                const { target, bubbles, cancelable, cancelBubble, srcElement, timeStamp, defaultPrevented, currentTarget, composed } = evt;
                const nf = function () { }
                const [stopPropagation, stopImmediatePropagation, preventDefault] = [nf, nf, nf];
                return {
                  type: 'tap',
                  eventPhase: 0,
                  isTrusted: false,
                  __composed: true,
                  bubbles, cancelable, cancelBubble, timeStamp,
                  target, srcElement, defaultPrevented, currentTarget, composed,
                  stopPropagation, stopImmediatePropagation, preventDefault
                };
              })(evt);
              targetCnt.showContextMenu.call(fakeTargetCnt, fakeEvent);
            } catch (e) {
              console.warn(e);
              propertyCounter = 7;
            }
            if (propertyCounter !== 5) {
              console.log('Error in prerequest for showContextMenu', propertyCounter);
              return;
            }
            pm1.assignLock(targetCnt, p1Timeout);
          }
        }, true);
      }
      /*
      const w=new Set(); for(const a of document.getElementsByTagName('*')) if(a.showContextMenu && a.showContextMenu_) w.add(a.is||''); console.log([...w.keys()])
      */
      whenDefinedMultiple([
        "yt-live-chat-ticker-sponsor-item-renderer",
        "yt-live-chat-banner-header-renderer",
        "yt-live-chat-text-message-renderer",
        "ytd-sponsorships-live-chat-gift-purchase-announcement-renderer",
        "ytd-sponsorships-live-chat-header-renderer",
        "ytd-sponsorships-live-chat-gift-redemption-announcement-renderer",
        "yt-live-chat-paid-sticker-renderer",
        "yt-live-chat-viewer-engagement-message-renderer",
        "yt-live-chat-paid-message-renderer"
      ]).then(sTags => {
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | fixShowContextMenu");
        console.log("[Begin]");
        const __showContextMenu_mutex__ = new Mutex();
        let __showContextMenu_mutex_unlock__ = null;
        let lastShowMenuTarget = null;
        const wm37 = new WeakMap();
        const dProto = {
          // CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN
          __cacheResolvedEndpointData__: (endpoint, a, doDeepCopy) => {
            if (a) {
              if (doDeepCopy) a = deepCopy(a);
              wm37.set(endpoint, a);
            } else {
              wm37.remove(endpoint);
            }
          },
          __getCachedEndpointData__: function (endpoint) {
            endpoint = endpoint || (this.data || 0).contextMenuEndpoint || 0;
            if (endpoint) return wm37.get(endpoint);
            return null;
          },
          /** @type {(resolvedEndpoint: any) => void 0} */
          __showCachedContextMenu__: function (resolvedEndpoint) { // non-null
            resolvedEndpoint = deepCopy(resolvedEndpoint);
            // let b = deepCopy(resolvedEndpoint, ['trackingParams', 'clickTrackingParams'])
            Promise.resolve(resolvedEndpoint).then(() => {
              this.__showContextMenu_skip_cacheResolvedEndpointData__ = 1;
              this.showContextMenu_(resolvedEndpoint);
              this.__showContextMenu_skip_cacheResolvedEndpointData__ = 0;
            });
          },
          showContextMenuForCacheReopen: function (a) {
            if (!this.__showContextMenu_forceNativeRequest__) {
              const endpoint = (this.data || 0).contextMenuEndpoint || 0;
              if (endpoint) {
                const resolvedEndpoint = this.__getCachedEndpointData__(endpoint);
                if (resolvedEndpoint) {
                  this.__showCachedContextMenu__(resolvedEndpoint);
                  a && a.stopPropagation()
                  return;
                }
              }
            }
            return this.showContextMenu37(a);
          },
          showContextMenuForCacheReopen_: function (a) {
            if (!this.__showContextMenu_skip_cacheResolvedEndpointData__) {
              const endpoint = (this.data || 0).contextMenuEndpoint || 0;
              if (endpoint) {
                const f = this.__cacheResolvedEndpointData__;
                if (typeof f === 'function') f(endpoint, a, true);
              }
            }
            return this.showContextMenu37_(a);
          },
          // ADVANCED_NOT_ALLOW_SCROLL_FOR_SHOW_CONTEXT_MENU
          showContextMenuWithDisableScroll: function (a) {
            const endpoint = (this.data || 0).contextMenuEndpoint || 0;
            if (endpoint && typeof this.is === 'string' && this.menuVisible === false && this.menuOpen === false) {
              const parentComponent = this.parentComponent;
              if (parentComponent && parentComponent.is === 'yt-live-chat-item-list-renderer' && parentComponent.contextMenuOpen === false && parentComponent.allowScroll === true) {
                parentComponent.allowScroll = false;
              }
            }
            return this.showContextMenu48.apply(this, arguments);
          },
          // ENABLE_MUTEX_FOR_SHOW_CONTEXT_MENU
          __showContextMenu_mutex_unlock_isEmpty__: () => {
            return __showContextMenu_mutex_unlock__ === null;
          },
          __showContextMenu_assign_lock__: function (p) {
            const mutex = __showContextMenu_mutex__;
            mutex.lockWith(unlock => {
              p.then(unlock);
            });
          },
          showContextMenuWithMutex: function (a) {
            lastShowMenuTarget = this;
            if (this.__showContextMenu_sync_mode_request__) {
              return this.showContextMenu47(a);
            } else {
              const mutex = __showContextMenu_mutex__;
              mutex.lockWith(unlock => {
                if (lastShowMenuTarget !== this) {
                  unlock();
                  return;
                }
                setTimeout(unlock, 800); // in case network failure
                __showContextMenu_mutex_unlock__ = unlock;
                try {
                  this.showContextMenu47(a);
                } catch (e) {
                  console.warn(e);
                  unlock(); // in case function script error
                }
              });
            }
          },
          showContextMenuWithMutex_: function (a) {
            if (__showContextMenu_mutex_unlock__ && this === lastShowMenuTarget) {
              __showContextMenu_mutex_unlock__();
              __showContextMenu_mutex_unlock__ = null;
            }
            return this.showContextMenu47_(a);
          }
        }
        for (const tag of sTags) { // ##tag##
          (() => {
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN && typeof cProto.showContextMenu === 'function' && typeof cProto.showContextMenu_ === 'function' && !cProto.showContextMenu37 && !cProto.showContextMenu37_ && cProto.showContextMenu.length === 1 && cProto.showContextMenu_.length === 1) {
              cProto.showContextMenu37_ = cProto.showContextMenu_;
              cProto.showContextMenu37 = cProto.showContextMenu;
              cProto.__showContextMenu_forceNativeRequest__ = 0;
              cProto.__cacheResolvedEndpointData__ = dProto.__cacheResolvedEndpointData__
              cProto.__getCachedEndpointData__ = dProto.__getCachedEndpointData__
              cProto.__showCachedContextMenu__ = dProto.__showCachedContextMenu__
              cProto.showContextMenu = dProto.showContextMenuForCacheReopen;
              cProto.showContextMenu_ = dProto.showContextMenuForCacheReopen_;
              console.log("CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN - OK", tag);
            } else {
              console.log("CACHE_SHOW_CONTEXT_MENU_FOR_REOPEN - NG", tag);
            }
            if (ADVANCED_NOT_ALLOW_SCROLL_FOR_SHOW_CONTEXT_MENU && typeof cProto.showContextMenu === 'function' && typeof cProto.showContextMenu_ === 'function' && !cProto.showContextMenu48 && !cProto.showContextMenu48_ && cProto.showContextMenu.length === 1 && cProto.showContextMenu_.length === 1) {
              cProto.showContextMenu48 = cProto.showContextMenu;
              cProto.showContextMenu = dProto.showContextMenuWithDisableScroll;
              console.log("ADVANCED_NOT_ALLOW_SCROLL_FOR_SHOW_CONTEXT_MENU - OK", tag);
            } else {
              console.log("ADVANCED_NOT_ALLOW_SCROLL_FOR_SHOW_CONTEXT_MENU - NG", tag);
            }
            if (ENABLE_MUTEX_FOR_SHOW_CONTEXT_MENU && typeof cProto.showContextMenu === 'function' && typeof cProto.showContextMenu_ === 'function' && !cProto.showContextMenu47 && !cProto.showContextMenu47_ && cProto.showContextMenu.length === 1 && cProto.showContextMenu_.length === 1) {
              cProto.showContextMenu47_ = cProto.showContextMenu_;
              cProto.showContextMenu47 = cProto.showContextMenu;
              cProto.__showContextMenu_mutex_unlock_isEmpty__ = dProto.__showContextMenu_mutex_unlock_isEmpty__;
              cProto.__showContextMenu_assign_lock__ = dProto.__showContextMenu_assign_lock__;
              cProto.showContextMenu = dProto.showContextMenuWithMutex;
              cProto.showContextMenu_ = dProto.showContextMenuWithMutex_;
              console.log("ENABLE_MUTEX_FOR_SHOW_CONTEXT_MENU - OK", tag);
            } else {
              console.log("ENABLE_MUTEX_FOR_SHOW_CONTEXT_MENU - NG", tag);
            }
          })();
        }
        console.log("[End]");
        console.groupEnd();
      }).catch(console.warn);
      customElements.whenDefined('tp-yt-iron-dropdown').then(() => {
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | tp-yt-iron-dropdown hacks");
        console.log("[Begin]");
        (() => {
          const tag = "tp-yt-iron-dropdown";
          const dummy = document.createElement(tag);
          const cProto = getProto(dummy);
          if (!cProto || !cProto.attached) {
            console.warn(`proto.attached for ${tag} is unavailable.`);
            return;
          }
          if (USE_VANILLA_DEREF && typeof cProto.__deraf === 'function' && cProto.__deraf.length === 2 && !cProto.__deraf34 && fnIntegrity(cProto.__deraf) === '2.42.24') {
            cProto.__deraf_hn__ = function (sId, fn) {
              const rhKey = `_rafHandler_${sId}`;
              const m = this[rhKey] || (this[rhKey] = new WeakMap());
              if (m.has(fn)) return m.get(fn);
              const resFn = () => {
                this.__rafs[sId] = null;
                fn.call(this)
              };
              m.set(fn, resFn);
              m.set(resFn, resFn);
              return resFn;
            };
            cProto.__deraf34 = cProto.__deraf;
            cProto.__deraf = function (a, b) { // sId, fn
              let c = this.__rafs;
              null !== c[a] && cancelAnimationFrame(c[a]);
              c[a] = requestAnimationFrame(this.__deraf_hn__(a, b));
            };
            console.log("USE_VANILLA_DEREF - OK");
          } else {
            console.log("USE_VANILLA_DEREF - NG");
          }
          if (FIX_DROPDOWN_DERAF && typeof cProto.__deraf === 'function' && cProto.__deraf.length === 2 && !cProto.__deraf66) {
            cProto.__deraf66 = cProto.__deraf;
            cProto.__deraf = function (sId, fn) {
              if (this.__byPassRAF__) {
                Promise.resolve().then(() => {
                  fn.call(this);
                });
              }
              let r = this.__deraf66.apply(this, arguments);
              return r;
            }
            console.log("FIX_DROPDOWN_DERAF - OK");
          } else {
            console.log("FIX_DROPDOWN_DERAF - NG");
          }
          if (BOOST_MENU_OPENCHANGED_RENDERING && typeof cProto.__openedChanged === 'function' && !cProto.__mtChanged__ && fnIntegrity(cProto.__openedChanged) === '0.46.20') {
            let lastClose = null;
            let lastOpen = null;
            let cid = 0;
            cProto.__mtChanged__ = function (b) {
              Promise.resolve().then(() => {
                this._applyFocus();
              }).then(() => {
                b ? this._renderOpened() : this._renderClosed();
              }).catch(console.warn);
            };
            const __moChanged__ = () => {
              if (!cid) return;
              // console.log(553, !!lastOpen, !!lastClose);
              cid = 0;
              if (lastOpen && !lastClose && lastOpen.isAttached) {
                lastOpen.__mtChanged__(1)
              } else if (lastClose && !lastOpen && lastClose.isAttached) {
                lastClose.__mtChanged__(0);
              }
              lastOpen = null;
              lastClose = null;
            };
            if (typeof cProto._openedChanged === 'function' && !cProto._openedChanged66) {
              cProto._openedChanged66 = cProto._openedChanged;
              cProto._openedChanged = function () {
                // this.__byPassRAF__ = !lastOpen ? true : false; // or just true?
                this.__byPassRAF__ = true;
                let r = this._openedChanged66.apply(this, arguments);
                this.__byPassRAF__ = false;
                return r;
              }
            }
            const pSetGet = (key, pdThis, pdBase) => {
              // note: this is not really a standard way for the getOwnPropertyDescriptors; but it is sufficient to make the job done
              return {
                get: (pdThis[key] || 0).get || (pdBase[key] || 0).get,
                set: (pdThis[key] || 0).set || (pdBase[key] || 0).set
              };
            };
            cProto.__modifiedMenuPropsFn__ = function () {
              const pdThis = Object.getOwnPropertyDescriptors(this.constructor.prototype)
              const pdBase = Object.getOwnPropertyDescriptors(this)
              const pdAutoFitOnAttach = pSetGet('autoFitOnAttach', pdThis, pdBase);
              const pdExpandSizingTargetForScrollbars = pSetGet('expandSizingTargetForScrollbars', pdThis, pdBase);
              const pdAllowOutsideScroll = pSetGet('allowOutsideScroll', pdThis, pdBase);
              if (pdAutoFitOnAttach.get || pdAutoFitOnAttach.set) {
                console.warn('there is setter/getter for autoFitOnAttach');
                return;
              }
              if (pdExpandSizingTargetForScrollbars.get || pdExpandSizingTargetForScrollbars.set) {
                console.warn('there is setter/getter for expandSizingTargetForScrollbars');
                return;
              }
              if (!pdAllowOutsideScroll.get || !pdAllowOutsideScroll.set) {
                console.warn('there is NO setter-getter for allowOutsideScroll');
                return;
              }
              let { autoFitOnAttach, expandSizingTargetForScrollbars, allowOutsideScroll } = this;
              this.__AllowOutsideScrollPD__ = pdAllowOutsideScroll;
              const fitEnable = CHAT_MENU_REFIT_ALONG_SCROLLING === 2;
              Object.defineProperties(this, {
                autoFitOnAttach: {
                  get() {
                    if (fitEnable && this._modifiedMenuPropOn062__) return true;
                    return autoFitOnAttach;
                  },
                  set(nv) {
                    autoFitOnAttach = nv;
                    return true;
                  },
                  enumerable: true,
                  configurable: true
                }, expandSizingTargetForScrollbars: {
                  get() {
                    if (fitEnable && this._modifiedMenuPropOn062__) return true;
                    return expandSizingTargetForScrollbars;
                  },
                  set(nv) {
                    expandSizingTargetForScrollbars = nv;
                    return true;
                  },
                  enumerable: true,
                  configurable: true
                }, allowOutsideScroll: {
                  get() {
                    if (this._modifiedMenuPropOn062__) return true;
                    return allowOutsideScroll;
                  },
                  set(nv) {
                    allowOutsideScroll = nv;
                    this.__AllowOutsideScrollPD__.set.call(this, nv);
                    return true;
                  },
                  enumerable: true,
                  configurable: true
                }
              })
            };
            /*
               // ***** position() to be changed. *****
              tp-yt-iron-dropdown[class], tp-yt-iron-dropdown[class] #contentWrapper, tp-yt-iron-dropdown[class] ytd-menu-popup-renderer[class] {
                  overflow: visible !important;
                  min-width: max-content !important;
                  max-width: max-content !important;
                  max-height: max-content !important;
                  min-height: max-content !important;
                  white-space: nowrap;
              }
            */
            if (FIX_MENU_POSITION_N_SIZING_ON_SHOWN && typeof cProto.position === 'function' && !cProto.position34 && typeof cProto.refit === 'function') {
              let m34 = 0;
              cProto.__refitByPosition__ = function () {
                m34++;
                if (m34 <= 0) m34 = 0;
                if (m34 !== 1) return;
                const hostElement = this.hostElement || this;
                if (document.visibilityState === 'visible') {
                  const sizingTarget = this.sizingTarget;
                  if (!sizingTarget) {
                    m34 = 0;
                    return;
                  }
                  /*
                  let useVisibilityCollapse = true;
                  if (HTMLElement.prototype.querySelector.call(sizingTarget, 'yt-icon:empty')) {
                    useVisibilityCollapse = false;
                  }
                  if (useVisibilityCollapse) {
                    hostElement.style.visibility = 'collapse';
                    sizingTarget.style.visibility = 'collapse';
                  } else {
                    hostElement.setAttribute('rNgzQ', '');
                    sizingTarget.setAttribute('rNgzQ', '');
                  }
                  */
                  hostElement.setAttribute('rNgzQ', '');
                  sizingTarget.setAttribute('rNgzQ', '');
                  const gn = () => {
                    /*
                    if (useVisibilityCollapse) {
                      hostElement.style.visibility = '';
                      sizingTarget.style.visibility = '';
                    } else {
                      hostElement.removeAttribute('rNgzQ');
                      sizingTarget.removeAttribute('rNgzQ');
                    }
                    */
                    hostElement.removeAttribute('rNgzQ');
                    sizingTarget.removeAttribute('rNgzQ');
                  }
                  const an = async () => {
                    while (m34 >= 1) {
                      await renderReadyPn(sizingTarget);
                      if (this.opened && this.isAttached && sizingTarget.isConnected === true && sizingTarget === this.sizingTarget) {
                        if (sizingTarget.matches('ytd-menu-popup-renderer[slot="dropdown-content"].yt-live-chat-app')) this.refit();
                      }
                      m34--;
                    }
                    m34 = 0;
                    Promise.resolve().then(gn);
                  }
                  setTimeout(an, 4); // wait those resizing function calls
                } else {
                  m34 = 0;
                }
              }
              cProto.position34 = cProto.position
              cProto.position = function () {
                if (this._positionInitialize_) {
                  this._positionInitialize_ = 0;
                  this.__refitByPosition__();
                }
                let r = cProto.position34.apply(this, arguments);
                return r;
              }
              console.log("FIX_MENU_POSITION_ON_SHOWN - OK");
            } else {
              console.log("FIX_MENU_POSITION_ON_SHOWN - NG");
            }
            cProto.__openedChanged = function () {
              this._positionInitialize_ = 1;
              // this.removeAttribute('horizontal-align')
              // this.removeAttribute('vertical-align')
              if (typeof this.__menuTypeCheck__ !== 'boolean') {
                this.__menuTypeCheck__ = true;
                if (CHAT_MENU_SCROLL_UNLOCKING) {
                  this._modifiedMenuPropOn062__ = false;
                  // console.log(513, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
                  // this.autoFitOnAttach = true;
                  // this.expandSizingTargetForScrollbars = true;
                  // this.allowOutsideScroll = true;
                  // console.log(519,Object.getOwnPropertyDescriptors(this.constructor.prototype))
                  this.__modifiedMenuPropsFn__();
                  // this.constrain= function(){}
                  // this.position= function(){}
                  // this.autoFitOnAttach = true;
                  // this.expandSizingTargetForScrollbars = true;
                  // this.allowOutsideScroll = true;
                }
              }
              if (CHAT_MENU_SCROLL_UNLOCKING && this.opened) {
                let newValue = null;
                const positionTarget = this.positionTarget;
                if (positionTarget && positionTarget.classList.contains('yt-live-chat-text-message-renderer')) {
                  if (this._modifiedMenuPropOn062__ === false) {
                    newValue = true;
                  }
                } else if (this._modifiedMenuPropOn062__ === true) {
                  newValue = false;
                }
                if (newValue !== null) {
                  const beforeAllowOutsideScroll = this.allowOutsideScroll;
                  this._modifiedMenuPropOn062__ = newValue;
                  const afterAllowOutsideScroll = this.allowOutsideScroll;
                  if (beforeAllowOutsideScroll !== afterAllowOutsideScroll) this.__AllowOutsideScrollPD__.set.call(this, afterAllowOutsideScroll);
                }
              }
              if (this.opened) {
                Promise.resolve().then(() => {
                  this._prepareRenderOpened();
                }).then(() => {
                  this._manager.addOverlay(this);
                  if (this._manager._overlays.length === 1) {
                    lastOpen = this;
                    lastClose = null;
                  } else {
                    return 1;
                  }
                  // if (cid) {
                  //   clearTimeout(cid);
                  //   cid = -1;
                  //   this.__moChanged__();
                  //   cid = 0;
                  // } else {
                  //   cid = -1;
                  //   this.__moChanged__();
                  //   cid = 0;
                  // }
                  // cid = cid > 0 ? clearTimeout(cid) : 0;
                  // console.log(580, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
                  // cid = cid || setTimeout(__moChanged__, delay1);
                  cid = cid || requestAnimationFrame(__moChanged__);
                }).then((r) => {
                  if (r) this.__mtChanged__(1);
                }).catch(console.warn);
              } else {
                Promise.resolve().then(() => {
                  this._manager.removeOverlay(this);
                  if (this._manager._overlays.length === 0) {
                    lastClose = this;
                    lastOpen = null;
                  } else {
                    return 1;
                  }
                  // cid = cid > 0 ? clearTimeout(cid) : 0;
                  // console.log(581, this.positionTarget && this.positionTarget.classList.contains('yt-live-chat-text-message-renderer'))
                  // cid = cid || setTimeout(__moChanged__, delay1);
                  cid = cid || requestAnimationFrame(__moChanged__);
                }).then((r) => {
                  if (r) this.__mtChanged__(0);
                }).catch(console.warn);
              }
            }
            console.log("BOOST_MENU_OPENCHANGED_RENDERING - OK");
          } else {
            assertor(() => fnIntegrity(cProto.__openedChanged, '0.46.20'));
            console.log("FIX_MENU_REOPEN_RENDER_PERFORMANC_1 - NG");
          }
          if (FIX_CLICKING_MESSAGE_MENU_DISPLAY_ON_MOUSE_CLICK && typeof cProto.__openedChanged === 'function' && !cProto.__openedChanged82) {
            cProto.__openedChanged82 = cProto.__openedChanged;
            cProto.__openedChanged = function () {
              // currentMenuPivotWR = null;
              // console.log(1480, '__openedChanged.A', this.positionTarget)
              // if (this.opened && this.positionTarget) {
              //   const positionTarget = this.positionTarget;
              //   console.log(1480, '__openedChanged.B', positionTarget)
              //   currentMenuPivotWR = mWeakRef(positionTarget);
              // }
              const positionTarget = this.positionTarget;
              currentMenuPivotWR = positionTarget ? mWeakRef(positionTarget) : null;
              return this.__openedChanged82.apply(this, arguments);
            }
          }
          // if(FIX_MENU_CAPTURE_SCROLL && typeof cProto.__onCaptureScroll === 'function' && !cProto.__onCaptureScroll66){
          //   cProto.__onCaptureScroll66 = cProto.__onCaptureScroll;
          //   cProto.__onCaptureScroll = function(a){
          //     const q = true;
          //     if(this.scrollAction === 'lock'  && q && this.opened){
          //       // console.log(9107, this.scrollAction, this.__isAnimating, this.opened, a); // lock; __isAnimating = false
          //       async function af() {
          //         this.__isAnimating && this._finishRenderOpened();
          //         if (!this.opened) return;
          //         this.__restoreScrollPosition();
          //         await new Promise(r => requestAnimationFrame(r));
          //         if (!this.opened) return;
          //         this.opened && this.__isAnimating && this._finishRenderOpened();
          //         if (!this.opened) return;
          //         this.__restoreScrollPosition();
          //         await new Promise(r => requestAnimationFrame(r));
          //         if (!this.opened) return;
          //         this.opened && this.__isAnimating && this._finishRenderOpened();
          //         if (!this.opened) return;
          //         this.opened && !this.__isAnimating && this.refit();
          //       }
          //       Promise.resolve().then(af);
          //        return cProto.__onCaptureScroll66.apply(this, arguments);
          //     }else{
          //       // console.log(9102, this.scrollAction, this.__isAnimating, this.opened, a); // lock
          //       return cProto.__onCaptureScroll66.apply(this, arguments);
          //     }
          //   }
          //   console.log("FIX_MENU_CAPTURE_SCROLL - OK");
          // }else{
          //   console.log("FIX_MENU_CAPTURE_SCROLL - NG");
          // }
        })();
        console.log("[End]");
        console.groupEnd();
      }).catch(console.warn);
      /*
          var FU = function() {
              var a = this;
              this.nextHandle_ = 1;
              this.clients_ = {};
              this.JSC$10323_callbacks_ = {};
              this.unsubscribeAsyncHandles_ = {};
              this.subscribe = vl(function(b, c, d) {
                  var e = Geb(b);
                  if (e in a.clients_)
                      e in a.unsubscribeAsyncHandles_ && Jq.cancel(a.unsubscribeAsyncHandles_[e]);
                  else {
                      a: {
                          var h = Geb(b), l;
                          for (l in a.unsubscribeAsyncHandles_) {
                              var m = a.clients_[l];
                              if (m instanceof KO) {
                                  delete a.clients_[l];
                                  delete a.JSC$10323_callbacks_[l];
                                  Jq.cancel(a.unsubscribeAsyncHandles_[l]);
                                  delete a.unsubscribeAsyncHandles_[l];
                                  i6a(m);
                                  m.objectId_ = new FQa(h);
                                  m.register();
                                  d = m;
                                  break a
                              }
                          }
                          d.objectSource = b.invalidationId.objectSource;
                          d.objectId = h;
                          if (b = b.webAuthConfigurationData)
                              b.multiUserSessionIndex && (d.sessionIndex = parseInt(b.multiUserSessionIndex, 10)),
                              b.pageId && (d.pageId = b.pageId);
                          d = new KO(d,a.handleInvalidationData_.bind(a));
                          d.register()
                      }
                      a.clients_[e] = d;
                      a.JSC$10323_callbacks_[e] = {}
                  }
                  d = a.nextHandle_++;
                  a.JSC$10323_callbacks_[e][d] = c;
                  return d
              })
          };
          FU.prototype.unsubscribe = function(a, b) {
              var c = Geb(a);
              if (c in this.JSC$10323_callbacks_ && (delete this.JSC$10323_callbacks_[c][b],
              !this.JSC$10323_callbacks_[c].length)) {
                  var d = this.clients_[c];
                  b = Jq.run(function() {
                      ei(d);
                      delete this.clients_[c];
                      delete this.unsubscribeAsyncHandles_[c]
                  }
                  .bind(this));
                  this.unsubscribeAsyncHandles_[c] = b
              }
          }
          ;
      */
      const onManagerFound = (dummyManager) => {
        if (!dummyManager || typeof dummyManager !== 'object') return;
        const mgrProto = dummyManager.constructor.prototype;
        let keyCallbackStore = '';
        for (const [key, v] of Object.entries(dummyManager)) {
          if (key.includes('_callbacks_')) keyCallbackStore = key;
        }
        if (!keyCallbackStore || typeof mgrProto.unsubscribe !== 'function' || mgrProto.unsubscribe.length !== 2) return;
        if (mgrProto.unsubscribe16) return;
        mgrProto.unsubscribe16 = mgrProto.unsubscribe;
        groupCollapsed("YouTube Super Fast Chat", " | *live-chat-manager* hacks");
        console.log("[Begin]");
        // const isEmptyObject = (a) => Object.keys(a).length === 0;
        const isEmptyObject = ((obj) => (firstKey(obj) === null));
        const idMapper = new Map();
        const convertId = function (objectId) {
          if (!objectId || typeof objectId !== 'string') return null;
          let result = idMapper.get(objectId)
          if (result) return result;
          result = atob(objectId.replace(/-/g, "+").replace(/_/g, "/"));
          idMapper.set(objectId, result)
          return result;
        }
        const rafHandleHolder = [];
        let pzw = 0;
        let lza = 0;
        const rafHandlerFn = () => {
          pzw = 0;
          if (rafHandleHolder.length === 1) {
            const f = rafHandleHolder[0];
            rafHandleHolder.length = 0;
            f();
          } else if (rafHandleHolder.length > 1) {
            const arr = rafHandleHolder.slice(0);
            rafHandleHolder.length = 0;
            for (const fn of arr) fn();
          }
        };
        if (CHANGE_MANAGER_UNSUBSCRIBE) {
          const checkIntegrityForSubscribe = (mgr) => {
            if (mgr
              && typeof mgr.unsubscribe16 === 'function' && mgr.unsubscribe16.length === 2
              && typeof mgr.subscribe18 === 'function' && (mgr.subscribe18.length === 0 || mgr.subscribe18.length === 3)) {
              const ns = new Set(Object.keys(mgr));
              const ms = new Set(Object.keys(mgr.constructor.prototype));
              if (ns.size >= 6 && ms.size >= 4) {
                // including 'subscribe18'
                // 'unsubscribe16', 'subscribe19'
                let r = 0;
                for (const k of ['nextHandle_', 'clients_', keyCallbackStore, 'unsubscribeAsyncHandles_', 'subscribe', 'subscribe18']) {
                  r += ns.has(k) ? 1 : 0;
                }
                for (const k of ['unsubscribe', 'handleInvalidationData_', 'unsubscribe16', 'subscribe19']) {
                  r += ms.has(k) ? 1 : 0;
                }
                if (r === 10) {
                  const isObject = (c) => (c || 0).constructor === Object;
                  if (isObject(mgr['clients_']) && isObject(mgr[keyCallbackStore]) && isObject(mgr['unsubscribeAsyncHandles_'])) {
                    return true;
                  }
                }
              }
            }
            return false;
          }
          mgrProto.subscribe19 = function (o, f, opts) {
            const ct_clients_ = this.clients_ || 0;
            const ct_handles_ = this.unsubscribeAsyncHandles_ || 0;
            if (this.__doCustomSubscribe__ !== true || !ct_clients_ || !ct_handles_) return this.subscribe18.apply(this, arguments);
            let objectId = ((o || 0).invalidationId || 0).objectId;
            if (!objectId) return this.subscribe18.apply(this, arguments);
            objectId = convertId(objectId);
            // console.log('subscribe', objectId, ct_clients_[objectId], arguments);
            if (ct_clients_[objectId]) {
              if (ct_handles_[objectId] < 0) delete ct_handles_[objectId];
            }
            return this.subscribe18.apply(this, arguments);
          }
          mgrProto.unsubscribe = function (o, d) {
            if (!this.subscribe18 && typeof this.subscribe === 'function') {
              this.subscribe18 = this.subscribe;
              this.subscribe = this.subscribe19;
              this.__doCustomSubscribe__ = checkIntegrityForSubscribe(this);
            }
            const ct_clients_ = this.clients_;
            const ct_handles_ = this.unsubscribeAsyncHandles_;
            if (this.__doCustomSubscribe__ !== true || !ct_clients_ || !ct_handles_) return this.unsubscribe16.apply(this, arguments);
            let objectId = ((o || 0).invalidationId || 0).objectId;
            if (!objectId) return this.unsubscribe16.apply(this, arguments);
            objectId = convertId(objectId);
            // console.log('unsubscribe', objectId, ct_clients_[objectId], arguments);
            const callbacks = this[keyCallbackStore] || 0;
            const callbackObj = callbacks[objectId] || 0;
            if (callbackObj && (delete callbackObj[d], isEmptyObject(callbackObj))) {
              const w = ct_clients_[objectId];
              --lza;
              if (lza < -1e9) lza = -1;
              const qta = lza;
              rafHandleHolder.push(() => {
                if (qta === ct_handles_[objectId]) {
                  const o = {
                    callbacks, callbackObj,
                    client: ct_clients_[objectId],
                    handle: ct_handles_[objectId]
                  };
                  let p = 0;
                  try {
                    if (ct_clients_[objectId] === w) {
                      w && "function" === typeof w.dispose && w.dispose();
                      delete ct_clients_[objectId];
                      delete ct_handles_[objectId];
                      p = 1;
                    } else {
                      // w && "function" === typeof w.dispose && w.dispose();
                      // delete ct_clients_[objectId];
                      // delete ct_handles_[objectId];
                      p = 2;
                    }
                  } catch (e) {
                    console.warn(e);
                  }
                  console.log(`unsubscribed: ${p}`, this, o);
                }
              });
              ct_handles_[objectId] = qta;
              if (pzw === 0) {
                pzw = requestAnimationFrame(rafHandlerFn);
              }
            }
          }
          console.log("CHANGE_MANAGER_UNSUBSCRIBE - OK")
        } else {
          console.log("CHANGE_MANAGER_UNSUBSCRIBE - NG")
        }
        console.log("[End]");
        console.groupEnd();
      }
      /*
              a.prototype.async = function(e, h) {
                  return 0 < h ? Iq.run(e.bind(this), h) : ~Kq.run(e.bind(this))
              }
              ;
              a.prototype.cancelAsync = function(e) {
                  0 > e ? Kq.cancel(~e) : Iq.cancel(e)
              }
      */
      (FASTER_ICON_RENDERING && Promise.all(
        [
          customElements.whenDefined("yt-icon-shape"),
          customElements.whenDefined("yt-icon")
          //  document.createElement('icon-shape'),
        ]
      )).then(() => {
        let cq = 0;
        let dummys = [document.createElement('yt-icon-shape'), document.createElement('yt-icon')]
        for (const dummy of dummys) {
          let cProto = getProto(dummy);
          if (cProto && typeof cProto.shouldRenderIconShape === 'function' && !cProto.shouldRenderIconShape571 && cProto.shouldRenderIconShape.length === 1) {
            assertor(() => fnIntegrity(cProto.shouldRenderIconShape, '1.70.38'));
            cq++;
            cProto.shouldRenderIconShape571 = cProto.shouldRenderIconShape;
            cProto.shouldRenderIconShape = function (a) {
              if (this.isAnimatedIcon) return this.shouldRenderIconShape571(a);
              if (!this.iconType || !this.iconShapeData) return this.shouldRenderIconShape571(a);
              if (!this.iconName) return this.shouldRenderIconShape571(a);
              return false;
              // console.log(1051, this.iconType)
              // console.log(1052, this.iconShapeData)
              // console.log(1053, this.isAnimatedIcon)
            }
          }
          // if(cProto && cProto.switchTemplateAtRegistration){
          //   cProto.switchTemplateAtRegistration = false;
          // }
        }
        if (cq === 1) {
          console.log("modified shouldRenderIconShape - Y")
        } else {
          console.log("modified shouldRenderIconShape - N", cq)
        }
      });
      customElements.whenDefined("yt-invalidation-continuation").then(() => {
        let __dummyManager__ = null;
        mightFirstCheckOnYtInit();
        groupCollapsed("YouTube Super Fast Chat", " | yt-invalidation-continuation hacks");
        console.log("[Begin]");
        (() => {
          const tag = "yt-invalidation-continuation"
          const dummy = document.createElement(tag);
          const cProto = getProto(dummy);
          if (!cProto || !cProto.attached) {
            console.warn(`proto.attached for ${tag} is unavailable.`);
            return;
          }
          const dummyManager = insp(dummy).manager_ || 0;
          __dummyManager__ = dummyManager;
          if (CHANGE_DATA_FLUSH_ASYNC && typeof cProto.async === 'function' && !cProto.async71 && cProto.async.length === 2 && typeof cProto.cancelAsync === 'function' && !cProto.cancelAsync71 && cProto.cancelAsync.length === 1) {
            const rafHub = new RAFHub();
            rafHub.keepRAF = true;
            cProto.async71 = cProto.async;
            cProto.cancelAsync71 = cProto.cancelAsync;
            // mostly for subscription timeoutMs 10000ms
            let mcw = 1; // 1, 3, 5, ...
            let arr = new Map();
            let __asyncInited__ = 0;
            let __timeoutStartId__ = null;
            const __asyncInit__ = () => {
              if (__asyncInited__) return;
              __asyncInited__ = 1;
              __timeoutStartId__ = setTimeout(() => { });
              mcw = __timeoutStartId__ * 2 + 1;
              setInterval(() => {
                if (!arr.length) return;
                const p = Date.now();
                let deleteKeys = [];
                arr.forEach((entry, key) => {
                  if (entry.cid === -1) {
                    entry.cid = -2;
                  } else if (entry.cid === -2) {
                    let offset = p - entry.add
                    if (offset < 0) offset = 0;
                    let delay2 = entry.delay - offset;
                    if (delay2 < 0) delay2 = 0;
                    entry.cid = setTimeout(entry.q(), delay2);
                    entry.q = null;
                  } else if (entry.add + entry.delay < p) {
                    deleteKeys.push(key);
                  }
                })
                for (const key of deleteKeys) arr.delete(key);
              }, 2000)
            }
            cProto.async = function (e, h) {
              if (!(0 < h)) return this.async71(e, h); // unknown timing Fn
              if (h < 8000) return this.async71(e, h) * 2; // native setTimeout
              if (typeof h !== 'number') return this.async71(e, h); // exceptional case
              if (!this.__asyncInited__) {
                this.__asyncInited__ = 1;
                __asyncInit__();
              }
              mcw += 2; // 2K+3, 2K+4, ...
              if (mcw > 1e9) mcw = mcw % 1e4;
              const cid = mcw;
              const q = () => {
                return () => {
                  console.log('async h > 8000');
                  e.call(this);
                }
              }
              // setTimeout(q, delay)
              arr.set(cid, {
                cid: -1, // -1 -> -2 -> cid
                add: Date.now(),
                q,
                delay: h
              });
              // console.log('cid-async', cid)
              return cid;
            }
            cProto.cancelAsync = function (e) {
              if (typeof e !== 'number') return this.cancelAsync71(e); // exceptional case
              // console.log('cid-unasync', e)
              if (0 > e) return this.cancelAsync71(e); // unknown timing fn
              if (e > __timeoutStartId__ * 2) { // __timeoutStartId__ is recorded and min is 2K+1
                if ((e % 2) === 0) return this.cancelAsync71(e / 2); // 2(K+1), 2(K+2), ...
                if (!arr.has(e)) return; // duplciated cancel
                const entry = arr.get(e);
                if (entry.cid < 0) {
                  entry.cid = 0;
                  arr.delete(e);
                } else {
                  clearTimeout(entry.cid); // cid >= 1
                  entry.cid = 0;
                  arr.delete(e);
                }
              } else {
                return this.cancelAsync71(e);
              }
            }
            console.log("CHANGE_DATA_FLUSH_ASYNC - OK");
          } else {
            console.log("CHANGE_DATA_FLUSH_ASYNC - NOT REQUIRED");
          }
        })();
        console.log("[End]");
        console.groupEnd();
        onManagerFound(__dummyManager__);
      }).catch(console.warn);
      if (INTERACTIVITY_BACKGROUND_ANIMATION >= 1) {
        customElements.whenDefined("yt-live-interactivity-component-background").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-interactivity-component-background hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-live-interactivity-component-background"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            cProto.__toStopAfterRun__ = function (hostElement) {
              let mo = new MutationObserver(() => {
                mo.disconnect();
                mo.takeRecords();
                mo = null;
                this.lottieAnimation && this.lottieAnimation.stop(); // primary
                foregroundPromiseFn().then(() => { // if the lottieAnimation is started with rAf triggering
                  this.lottieAnimation && this.lottieAnimation.stop(); // fallback
                });
              });
              mo.observe(hostElement, { subtree: true, childList: true });
            }
            if (INTERACTIVITY_BACKGROUND_ANIMATION >= 1 && typeof cProto.maybeLoadAnimationBackground === 'function' && !cProto.maybeLoadAnimationBackground77 && cProto.maybeLoadAnimationBackground.length === 0) {
              cProto.maybeLoadAnimationBackground77 = cProto.maybeLoadAnimationBackground;
              cProto.maybeLoadAnimationBackground = function () {
                let toRun = true;
                let stopAfterRun = false;
                if (!this.__bypassDisableAnimationBackground__) {
                  let doFix = false;
                  if (INTERACTIVITY_BACKGROUND_ANIMATION === 1) {
                    if (!this.lottieAnimation) {
                      doFix = true;
                    }
                  } else if (INTERACTIVITY_BACKGROUND_ANIMATION === 2) {
                    doFix = true;
                  }
                  if (doFix) {
                    if (this.useAnimationBackground === true) {
                      console.log('DISABLE_INTERACTIVITY_BACKGROUND_ANIMATION', this.lottieAnimation);
                    }
                    toRun = true;
                    stopAfterRun = true;
                  }
                }
                if (toRun) {
                  if (stopAfterRun && (this.hostElement instanceof HTMLElement)) {
                    this.__toStopAfterRun__(this.hostElement); // primary
                  }
                  const r = this.maybeLoadAnimationBackground77.apply(this, arguments);
                  if (stopAfterRun && this.lottieAnimation) {
                    this.lottieAnimation.stop(); // fallback if no mutation
                  }
                  return r;
                }
              }
              console.log(`INTERACTIVITY_BACKGROUND_ANIMATION${INTERACTIVITY_BACKGROUND_ANIMATION} - OK`);
            } else {
              console.log(`INTERACTIVITY_BACKGROUND_ANIMATION${INTERACTIVITY_BACKGROUND_ANIMATION} - NG`);
            }
          })();
          console.log("[End]");
          console.groupEnd();
        }).catch(console.warn);
      }
      if (DELAY_FOCUSEDCHANGED) {
        customElements.whenDefined("yt-live-chat-text-input-field-renderer").then(() => {
          mightFirstCheckOnYtInit();
          groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-text-input-field-renderer hacks");
          console.log("[Begin]");
          (() => {
            const tag = "yt-live-chat-text-input-field-renderer"
            const dummy = document.createElement(tag);
            const cProto = getProto(dummy);
            if (!cProto || !cProto.attached) {
              console.warn(`proto.attached for ${tag} is unavailable.`);
              return;
            }
            if (DELAY_FOCUSEDCHANGED && typeof cProto.focusedChanged === 'function' && cProto.focusedChanged.length === 0 && !cProto.focusedChanged372) {
              cProto.focusedChanged372 = cProto.focusedChanged;
              cProto.focusedChanged = function () {
                Promise.resolve().then(() => {
                  if (this.isAttached === true) this.focusedChanged372();
                });
              }
            }
          })();
          console.log("[End]");
          console.groupEnd();
        });
      }
    }
    promiseForCustomYtElementsReady.then(onRegistryReadyForDOMOperations);
    const fixJsonParse = () => {
      let p1 = window.onerror;
      try {
        JSON.parse("{}");
      } catch (e) {
        console.warn(e);
      }
      let p2 = window.onerror;
      if (p1 !== p2) {
        console.groupCollapsed(`%c${"YouTube Super Fast Chat"}%c${" | JS Engine Issue Found"}`,
          "background-color: #010502; color: #fe806a; font-weight: 700; padding: 2px;",
          "background-color: #010502; color: #fe806a; font-weight: 300; padding: 2px;"
        );
        console.warn("\nJSON.parse is hacked (e.g. Brave's script injection) which causes window.onerror changes on every JSON.parse call.\nPlease install https://greasyfork.org/scripts/473972-youtube-js-engine-tamer to fix the issue.\n");
        console.groupEnd();
      }
    }
    if (CHECK_JSONPRUNE) {
      promiseForCustomYtElementsReady.then(fixJsonParse);
    }
  });
})({ IntersectionObserver });