☰

YouTube JS Engine Tamer

To enhance YouTube performance by modifying YouTube JS Engine

当前为 2023-09-06 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        YouTube JS Engine Tamer
  3. // @namespace   UserScripts
  4. // @match       https://www.youtube.com/*
  5. // @version     0.4.9
  6. // @license     MIT
  7. // @author      CY Fung
  8. // @icon        https://github.com/cyfung1031/userscript-supports/raw/main/icons/yt-engine.png
  9. // @description To enhance YouTube performance by modifying YouTube JS Engine
  10. // @grant       none
  11. // @run-at      document-start
  12. // @unwrap
  13. // @inject-into page
  14. // @allFrames   true
  15. // ==/UserScript==
  16.  
  17. (() => {
  18.  
  19.   const NATIVE_CANVAS_ANIMATION = true; // for #cinematics
  20.   const FIX_schedulerInstanceInstance_ = true;
  21.   const FIX_yt_player = true;
  22.   const FIX_Animation_n_timeline = true;
  23.   const NO_PRELOAD_GENERATE_204 = false;
  24.   const CHANGE_appendChild = true;
  25.  
  26.   const FIX_error_many_stack = true; // should be a bug caused by uBlock Origin
  27.   // const FIX_error_many_stack_keepAliveDuration = 200; // ms
  28.   // const FIX_error_many_stack_keepAliveDuration_check_if_n_larger_than = 8;
  29.  
  30.   /*
  31.   window.addEventListener('edm',()=>{
  32.     let p = [...this.onerror.errorTokens][0].token; (()=>{ console.log(p); throw new Error(p);console.log(334,p) })()
  33.   });
  34.  
  35.   window.addEventListener('edn',()=>{
  36.     let p = [...this.onerror.errorTokens][0].token+"X"; (()=>{ console.log(p); throw new Error(p);console.log(334,p) })()
  37.   });
  38.   window.addEventListener('edr',()=>{
  39.     let p = '123'; (()=>{ console.log(p); throw new Error(p);console.log(334,p) })()
  40.   });
  41. */
  42.  
  43.  
  44.   const prepareLogs = [];
  45.  
  46.   const skipAdsDetection = new Set(['/robots.txt', '/live_chat', '/live_chat_replay']);
  47.  
  48.   let winError00 = window.onerror;
  49.  
  50.   let fix_error_many_stack_state = !FIX_error_many_stack ? 0 : skipAdsDetection.has(location.pathname) ? 2 : 1;
  51.  
  52.   if (!JSON || !('parse' in JSON)) fix_error_many_stack_state = 0;
  53.  
  54.  
  55.   ; fix_error_many_stack_state === 1 && (() => {
  56.  
  57.  
  58.     let p1 = winError00;
  59.  
  60.     let stackNeedleDetails = null;
  61.  
  62.     Object.defineProperty(Object.prototype, 'matchAll', {
  63.       get() {
  64.         stackNeedleDetails = this;
  65.         return true;
  66.       },
  67.       enumerable: true,
  68.       configurable: true
  69.     });
  70.  
  71.     try {
  72.       JSON.parse("{}");
  73.     } catch (e) {
  74.       console.warn(e)
  75.       fix_error_many_stack_state = 0;
  76.     }
  77.  
  78.     delete Object.prototype['matchAll'];
  79.  
  80.     let p2 = window.onerror;
  81.  
  82.     window.onerror = p1;
  83.  
  84.     if (fix_error_many_stack_state === 0) return;
  85.  
  86.     if (stackNeedleDetails) {
  87.       JSON.parse.stackNeedleDetails = stackNeedleDetails;
  88.       stackNeedleDetails.matchAll = true;
  89.     }
  90.  
  91.     if (p1 === p2) return (fix_error_many_stack_state = 0);
  92.  
  93.     // p1!==p2
  94.     fix_error_many_stack_state = !stackNeedleDetails ? 4 : 3;
  95.  
  96.   })();
  97.  
  98.   ; fix_error_many_stack_state === 2 && (() => {
  99.  
  100.  
  101.     let p1 = winError00;
  102.  
  103.     let objectPrune = null;
  104.     let stackNeedleDetails = null;
  105.  
  106.     Object.defineProperty(Function.prototype, 'findOwner', {
  107.       get() {
  108.         objectPrune = this;
  109.         return this._findOwner;
  110.       },
  111.       set(nv) {
  112.         this._findOwner = nv;
  113.         return true;
  114.       },
  115.       enumerable: true,
  116.       configurable: true
  117.     });
  118.  
  119.     Object.defineProperty(Object.prototype, 'matchAll', {
  120.       get() {
  121.         stackNeedleDetails = this;
  122.         return true;
  123.       },
  124.       enumerable: true,
  125.       configurable: true
  126.     });
  127.  
  128.     try {
  129.       JSON.parse("{}");
  130.     } catch (e) {
  131.       console.warn(e)
  132.       fix_error_many_stack_state = 0;
  133.     }
  134.  
  135.     delete Function.prototype['findOwner'];
  136.     delete Object.prototype['matchAll'];
  137.  
  138.     let p2 = window.onerror;
  139.  
  140.     if (p1 !== p2) return (fix_error_many_stack_state = 4); // p1 != p2
  141.  
  142.     if (fix_error_many_stack_state == 0) return;
  143.  
  144.     // the following will only execute when Brave's scriptlets.js is executed.
  145.  
  146.     prepareLogs.push("fix_error_many_stack_state NB")
  147.  
  148.     if (stackNeedleDetails) {
  149.       stackNeedleDetails.pattern = null;
  150.       stackNeedleDetails.re = null;
  151.       stackNeedleDetails.expect = null;
  152.       stackNeedleDetails.matchAll = true;
  153.     }
  154.  
  155.     if (objectPrune) {
  156.       objectPrune.findOwner = objectPrune.mustProcess = objectPrune.logJson = () => { }
  157.       delete objectPrune._findOwner;
  158.     }
  159.  
  160.     fix_error_many_stack_state = 3;
  161.     JSON.parse.stackNeedleDetails = stackNeedleDetails;
  162.     JSON.parse.objectPrune = objectPrune;
  163.  
  164.   })();
  165.  
  166.   ; fix_error_many_stack_state === 3 && (() => {
  167.  
  168.  
  169.     let p1 = winError00;
  170.  
  171.     try {
  172.       JSON.parse("{}");
  173.     } catch (e) {
  174.       console.warn(e)
  175.       fix_error_many_stack_state = 0;
  176.     }
  177.  
  178.     let p2 = window.onerror;
  179.  
  180.     if (p1 === p2) return;
  181.  
  182.     window.onerror = p1;
  183.  
  184.     if (fix_error_many_stack_state === 0) return;
  185.  
  186.     fix_error_many_stack_state = 4; // p1 != p2
  187.  
  188.  
  189.   })();
  190.  
  191.   fix_error_many_stack_state === 4 && (() => {
  192.  
  193.     // the following will only execute when Brave's scriptlets.js is executed.
  194.  
  195.     prepareLogs.push("fix_error_many_stack_state AB")
  196.  
  197.     JSON.parseProxy = JSON.parse;
  198.  
  199.     JSON.parse = ((parse) => {
  200.  
  201.       parse = parse.bind(JSON); // get a new instance of the current JSON.parse
  202.       return function (text, reviver) {
  203.         const onerror = window.onerror;
  204.         window.onerror = null;
  205.         let r;
  206.         try {
  207.           r = parse(...arguments);
  208.         } catch (e) {
  209.           r = e;
  210.         }
  211.         window.onerror = onerror;
  212.         if (r instanceof Error) {
  213.           throw r;
  214.         }
  215.         return r;
  216.       }
  217.  
  218.     })(JSON.parse);
  219.  
  220.  
  221.   })();
  222.  
  223.  
  224.  
  225.   // ================================================ 0.4.5 ================================================
  226.  
  227.  
  228.   // ; (() => {
  229.  
  230.   //   if (FIX_error_many_stack && self instanceof Window) {
  231.   //     // infinite stack due to matchesStackTrace inside objectPrune of AdsBlock
  232.  
  233.   //     const pdK = Object.getOwnPropertyDescriptor(window, 'onerror');
  234.   //     if (!pdK || (pdK.get && pdK.configurable)) {
  235.  
  236.   //     } else {
  237.   //       return;
  238.   //     }
  239.  
  240.   //     let unsupportErrorFix = false;
  241.  
  242.   //     let firstHook = true;
  243.   //     let busy33 = false;
  244.  
  245.   //     let state = 0;
  246.  
  247.   //     if (pdK) {
  248.   //       delete window['onerror'];
  249.   //     }
  250.  
  251.   //     const pd = {
  252.   //       get() {
  253.   //         const stack = (new Error()).stack;
  254.   //         // targetStack = stack;
  255.   //         let isGetExceptionToken = stack.indexOf('getExceptionToken') >= 0;
  256.   //         state = isGetExceptionToken ? 1 : 0;
  257.   //         delete Window.prototype['onerror'];
  258.   //         let r = pdK ? pdK.get.call(this) : this.onerror;
  259.   //         Object.defineProperty(Window.prototype, 'onerror', pd);
  260.   //         //        console.log('onerror get', r)
  261.   //         return r;
  262.   //       },
  263.   //       set(nv) {
  264.   //         const stack = (new Error()).stack;
  265.   //         let isGetExceptionToken = stack.indexOf('getExceptionToken') >= 0;
  266.   //         state = state === 1 && isGetExceptionToken ? 2 : 0;
  267.   //         /** @type {string?} */
  268.   //         let sToken = null;
  269.   //         if (unsupportErrorFix || busy33) {
  270.  
  271.   //         } else if (typeof nv === 'function' && state === 2) {
  272.   //           if (firstHook) {
  273.   //             firstHook = false;
  274.   //             console.groupCollapsed('Infinite onerror Bug Found');
  275.   //             console.log(location.href);
  276.   //             console.log(stack);
  277.   //             console.log(nv);
  278.   //             console.groupEnd();
  279.   //           }
  280.   //           let _token = null;
  281.   //           busy33 = true;
  282.   //           String.prototype.includes76 = String.prototype.includes;
  283.   //           String.prototype.includes = function (token) {
  284.   //             _token = token;
  285.   //             return true;
  286.   //           }
  287.   //           nv('token');
  288.   //           String.prototype.includes = String.prototype.includes76;
  289.   //           sToken = _token;
  290.   //           busy33 = false;
  291.   //           if (typeof sToken !== 'string') {
  292.   //             unsupportErrorFix = true;
  293.   //           }
  294.   //         }
  295.   //         delete Window.prototype['onerror'];
  296.   //         if (typeof sToken === 'string' && sToken.length > 1) {
  297.   //           /** @type {string} */
  298.   //           const token = sToken;
  299.   //           /** @type {OnErrorEventHandler & {errorTokens: Set<string>?} } */
  300.   //           const currentOnerror = pdK ? pdK.get.call(this) : this.onerror;
  301.  
  302.   //           const now = Date.now();
  303.   //           const tokenEntry = {
  304.   //             token,
  305.   //             expired: now + FIX_error_many_stack_keepAliveDuration
  306.   //           }
  307.   //           /** @typedef {typeof tokenEntry} TokenEntry */
  308.  
  309.   //           /** @type {Set<TokenEntry>} */
  310.   //           const errorTokens = currentOnerror.errorTokens;
  311.  
  312.   //           if (errorTokens) {
  313.   //             if (errorTokens.size > FIX_error_many_stack_keepAliveDuration_check_if_n_larger_than) {
  314.   //               for (const entry of errorTokens) {
  315.   //                 if (entry.expired < now) {
  316.   //                   errorTokens.delete(entry);
  317.   //                 }
  318.   //               }
  319.   //             }
  320.   //             errorTokens.add(tokenEntry)
  321.   //           } else {
  322.   //             /** @type {Set<TokenEntry>} */
  323.   //             const errorTokens = new Set([tokenEntry]);
  324.   //             /** @type {OnErrorEventHandler & {errorTokens: Set<string>} } */
  325.   //             const newOnerror = ((oe) => {
  326.   //               const r = function (msg, ...args) {
  327.   //                 if (typeof msg === 'string' && errorTokens.size > 0) {
  328.   //                   for (const entry of errorTokens) {
  329.   //                     if (msg.includes(entry.token)) return true;
  330.   //                   }
  331.   //                 }
  332.   //                 if (typeof oe === 'function') {
  333.   //                   return oe.apply(this, arguments);
  334.   //                 }
  335.   //               };
  336.   //               r.errorTokens = errorTokens;
  337.   //               return r;
  338.   //             })(currentOnerror);
  339.  
  340.   //             if (pdK && pdK.set) pdK.set.call(this, newOnerror);
  341.   //             else this.onerror = newOnerror;
  342.   //           }
  343.   //         } else {
  344.   //           if (pdK && pdK.set) pdK.set.call(this, nv);
  345.   //           else this.onerror = nv;
  346.   //         }
  347.   //         Object.defineProperty(Window.prototype, 'onerror', pd);
  348.  
  349.   //         // console.log('onerror set', nv)
  350.   //         return true;
  351.   //       },
  352.   //       enumerable: true,
  353.   //       configurable: true
  354.   //     }
  355.  
  356.   //     Object.defineProperty(Window.prototype, 'onerror', pd);
  357.  
  358.  
  359.   //   }
  360.  
  361.  
  362.   // })();
  363.  
  364.  
  365.  
  366.   // ================================================ 0.4.5 ================================================
  367.  
  368.  
  369.   // << if FIX_yt_player >>
  370.  
  371.   // credit to @nopeless (https://greasyfork.org/scripts/471489-youtube-player-perf/)
  372.   const PERF_471489_ = true;
  373.   // PERF_471489_ is not exactly the same to Youtube Player perf v0.7
  374.   // This script uses a much gentle way to tamer the JS engine instead.
  375.  
  376.   // << end >>
  377.  
  378.   const steppingScaleN = 200; // transform: scaleX(k/N); 0<k<N
  379.  
  380.   const Promise = (async () => { })().constructor;
  381.  
  382.   let isMainWindow = false;
  383.   try {
  384.     isMainWindow = window.document === window.top.document
  385.   } catch (e) { }
  386.  
  387.   let NO_PRELOAD_GENERATE_204_BYPASS = NO_PRELOAD_GENERATE_204 ? false : true;
  388.  
  389.   const onRegistryReady = (callback) => {
  390.     if (typeof customElements === 'undefined') {
  391.       if (!('__CE_registry' in document)) {
  392.         // https://github.com/webcomponents/polyfills/
  393.         Object.defineProperty(document, '__CE_registry', {
  394.           get() {
  395.             // return undefined
  396.           },
  397.           set(nv) {
  398.             if (typeof nv == 'object') {
  399.               delete this.__CE_registry;
  400.               this.__CE_registry = nv;
  401.               this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
  402.             }
  403.             return true;
  404.           },
  405.           enumerable: false,
  406.           configurable: true
  407.         })
  408.       }
  409.       let eventHandler = (evt) => {
  410.         document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  411.         const f = callback;
  412.         callback = null;
  413.         eventHandler = null;
  414.         f();
  415.       };
  416.       document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  417.     } else {
  418.       callback();
  419.     }
  420.   };
  421.  
  422.   const getZq = (_yt_player) => {
  423.  
  424.     const w = 'Zq';
  425.  
  426.     let arr = [];
  427.  
  428.     for (const [k, v] of Object.entries(_yt_player)) {
  429.  
  430.       const p = typeof v === 'function' ? v.prototype : 0;
  431.       if (p
  432.         && typeof p.start === 'function' && p.start.length === 0
  433.         && typeof p.isActive === 'function' && p.isActive.length === 0
  434.         && typeof p.stop === 'function' && p.stop.length === 0
  435.         && !p.isComplete && !p.getStatus && !p.getResponseHeader && !p.getLastError
  436.         && !p.send && !p.abort
  437.         && !p.sample && !p.initialize && !p.fail && !p.getName
  438.         // && !p.dispose && !p.isDisposed
  439.  
  440.       ) {
  441.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  442.  
  443.  
  444.       }
  445.  
  446.     }
  447.  
  448.     if (arr.length === 0) {
  449.  
  450.       console.warn(`Key does not exist. [${w}]`);
  451.     } else {
  452.  
  453.       console.log(`[${w}]`, arr);
  454.       return arr[0];
  455.     }
  456.  
  457.  
  458.  
  459.  
  460.   }
  461.  
  462.  
  463.   const getVG = (_yt_player) => {
  464.     const w = 'VG';
  465.  
  466.     let arr = [];
  467.  
  468.     for (const [k, v] of Object.entries(_yt_player)) {
  469.  
  470.       const p = typeof v === 'function' ? v.prototype : 0;
  471.       if (p
  472.         && typeof p.show === 'function' && p.show.length === 1
  473.         && typeof p.hide === 'function' && p.hide.length === 0
  474.         && typeof p.stop === 'function' && p.stop.length === 0) {
  475.  
  476.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  477.  
  478.       }
  479.  
  480.     }
  481.  
  482.  
  483.     if (arr.length === 0) {
  484.  
  485.       console.warn(`Key does not exist. [${w}]`);
  486.     } else {
  487.  
  488.       console.log(`[${w}]`, arr);
  489.       return arr[0];
  490.     }
  491.  
  492.  
  493.  
  494.   }
  495.  
  496.  
  497.   const getzo = (_yt_player) => {
  498.     const w = 'zo';
  499.  
  500.     let arr = [];
  501.  
  502.     for (const [k, v] of Object.entries(_yt_player)) {
  503.  
  504.       if (
  505.         typeof v === 'function' && v.length === 3 && k.length < 3
  506.         && (v + "").includes("a.style[b]=c")
  507.       ) {
  508.  
  509.         arr.push(k);
  510.  
  511.       }
  512.  
  513.     }
  514.  
  515.  
  516.     if (arr.length === 0) {
  517.  
  518.       console.warn(`Key does not exist. [${w}]`);
  519.     } else {
  520.  
  521.       console.log(`[${w}]`, arr);
  522.       return arr[0];
  523.     }
  524.  
  525.   }
  526.  
  527.   const addProtoToArr = (parent, key, arr) => {
  528.  
  529.  
  530.     let isChildProto = false;
  531.     for (const sr of arr) {
  532.       if (parent[key].prototype instanceof parent[sr]) {
  533.         isChildProto = true;
  534.         break;
  535.       }
  536.     }
  537.  
  538.     if (isChildProto) return;
  539.  
  540.     arr = arr.filter(sr => {
  541.       if (parent[sr].prototype instanceof parent[key]) {
  542.         return false;
  543.       }
  544.       return true;
  545.     });
  546.  
  547.     arr.push(key);
  548.  
  549.     return arr;
  550.  
  551.  
  552.   }
  553.  
  554.   const getuG = (_yt_player) => {
  555.  
  556.     const w = 'uG';
  557.  
  558.     let arr = [];
  559.  
  560.     for (const [k, v] of Object.entries(_yt_player)) {
  561.  
  562.  
  563.       const p = typeof v === 'function' ? v.prototype : 0;
  564.  
  565.       if (p
  566.         && typeof p.createElement === 'function' && p.createElement.length === 2
  567.         && typeof p.detach === 'function' && p.detach.length === 0
  568.         && typeof p.update === 'function' && p.update.length === 1
  569.         && typeof p.updateValue === 'function' && p.updateValue.length === 2
  570.       ) {
  571.  
  572.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  573.  
  574.       }
  575.  
  576.     }
  577.  
  578.  
  579.  
  580.  
  581.  
  582.     if (arr.length === 0) {
  583.  
  584.       console.warn(`Key does not exist. [${w}]`);
  585.     } else {
  586.  
  587.       console.log(`[${w}]`, arr);
  588.       return arr[0];
  589.     }
  590.  
  591.   }
  592.  
  593.  
  594.  
  595.   // << if FIX_schedulerInstanceInstance_ >>
  596.  
  597.   let idleFrom = Date.now() + 2700;
  598.   let slowMode = false;
  599.  
  600.   let ytEvented = false;
  601.  
  602.  
  603.   function setupEvents() {
  604.  
  605.     document.addEventListener('yt-navigate', () => {
  606.  
  607.       ytEvented = true;
  608.       slowMode = false;
  609.       idleFrom = Date.now() + 2700;
  610.  
  611.     });
  612.     document.addEventListener('yt-navigate-start', () => {
  613.  
  614.       ytEvented = true;
  615.       slowMode = false;
  616.       idleFrom = Date.now() + 2700;
  617.  
  618.     });
  619.  
  620.     document.addEventListener('yt-page-type-changed', () => {
  621.  
  622.       ytEvented = true;
  623.       slowMode = false;
  624.       idleFrom = Date.now() + 1700;
  625.  
  626.     });
  627.  
  628.  
  629.     document.addEventListener('yt-player-updated', () => {
  630.  
  631.       ytEvented = true;
  632.       slowMode = false;
  633.       idleFrom = Date.now() + 1700;
  634.  
  635.     });
  636.  
  637.  
  638.     document.addEventListener('yt-page-data-fetched', () => {
  639.  
  640.       ytEvented = true;
  641.       slowMode = false;
  642.       idleFrom = Date.now() + 1700;
  643.  
  644.     });
  645.  
  646.     document.addEventListener('yt-navigate-finish', () => {
  647.  
  648.       ytEvented = true;
  649.       slowMode = false;
  650.       let t = Date.now() + 700;
  651.       if (t > idleFrom) idleFrom = t;
  652.  
  653.     });
  654.  
  655.     document.addEventListener('yt-page-data-updated', () => {
  656.  
  657.       ytEvented = true;
  658.       slowMode = false;
  659.       let t = Date.now() + 700;
  660.       if (t > idleFrom) idleFrom = t;
  661.  
  662.     });
  663.  
  664.     document.addEventListener('yt-watch-comments-ready', () => {
  665.  
  666.       ytEvented = true;
  667.       slowMode = false;
  668.       let t = Date.now() + 700;
  669.       if (t > idleFrom) idleFrom = t;
  670.  
  671.     });
  672.   }
  673.  
  674.  
  675.   // << end >>
  676.  
  677.   const cleanContext = async (win) => {
  678.     const waitFn = requestAnimationFrame; // shall have been binded to window
  679.     try {
  680.       let mx = 16; // MAX TRIAL
  681.       const frameId = 'vanillajs-iframe-v1';
  682.       /** @type {HTMLIFrameElement | null} */
  683.       let frame = document.getElementById(frameId);
  684.       let removeIframeFn = null;
  685.       if (!frame) {
  686.         frame = document.createElement('iframe');
  687.         frame.id = 'vanillajs-iframe-v1';
  688.         frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
  689.         let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
  690.         n.appendChild(frame);
  691.         while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
  692.         const root = document.documentElement;
  693.         root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
  694.         removeIframeFn = (setTimeout) => {
  695.           const removeIframeOnDocumentReady = (e) => {
  696.             e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  697.             win = null;
  698.             setTimeout(() => {
  699.               n.remove();
  700.               n = null;
  701.             }, 200);
  702.           }
  703.           if (document.readyState !== 'loading') {
  704.             removeIframeOnDocumentReady();
  705.           } else {
  706.             win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  707.           }
  708.         }
  709.       }
  710.       while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
  711.       const fc = frame.contentWindow;
  712.       if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
  713.       const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback, getComputedStyle } = fc;
  714.       const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback, getComputedStyle };
  715.       for (let k in res) res[k] = res[k].bind(win); // necessary
  716.       if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
  717.       res.animate = fc.HTMLElement.prototype.animate;
  718.       return res;
  719.     } catch (e) {
  720.       console.warn(e);
  721.       return null;
  722.     }
  723.   };
  724.  
  725.  
  726.   const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  727.  
  728.   cleanContext(window).then(__CONTEXT__ => {
  729.     if (!__CONTEXT__) return null;
  730.  
  731.     const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, animate, requestIdleCallback, getComputedStyle } = __CONTEXT__;
  732.  
  733.  
  734.  
  735.     let rafPromiseForTickers = null;
  736.  
  737.     const getRafPromiseForTickers = () => rafPromiseForTickers || (rafPromiseForTickers = new Promise(resolve => {
  738.       requestAnimationFrame(hRes => {
  739.         rafPromiseForTickers = null;
  740.         resolve(hRes);
  741.       });
  742.     }));
  743.  
  744.     const getForegroundPromise = () => {
  745.       if (document.visibilityState === 'visible') {
  746.         return Promise.resolve();
  747.       } else {
  748.         return getRafPromiseForTickers();
  749.       }
  750.     };
  751.  
  752.     NO_PRELOAD_GENERATE_204_BYPASS || promiseForCustomYtElementsReady.then(() => {
  753.       setTimeout(() => {
  754.         NO_PRELOAD_GENERATE_204_BYPASS = true;
  755.       }, 1270);
  756.     });
  757.  
  758.     const promiseForTamerTimeout = new Promise(resolve => {
  759.       promiseForCustomYtElementsReady.then(() => {
  760.         customElements.whenDefined('ytd-app').then(() => {
  761.           setTimeout(resolve, 1200);
  762.         });
  763.       });
  764.       setTimeout(resolve, 3000);
  765.     });
  766.  
  767.  
  768.     class RAFHub {
  769.       constructor() {
  770.         /** @type {number} */
  771.         this.startAt = 8170;
  772.         /** @type {number} */
  773.         this.counter = 0;
  774.         /** @type {number} */
  775.         this.rid = 0;
  776.         /** @type {Map<number, FrameRequestCallback>} */
  777.         this.funcs = new Map();
  778.         const funcs = this.funcs;
  779.         /** @type {FrameRequestCallback} */
  780.         this.bCallback = this.mCallback.bind(this);
  781.         this.pClear = () => funcs.clear();
  782.       }
  783.       /** @param {DOMHighResTimeStamp} highResTime */
  784.       mCallback(highResTime) {
  785.         this.rid = 0;
  786.         Promise.resolve().then(this.pClear);
  787.         this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
  788.       }
  789.       /** @param {FrameRequestCallback} f */
  790.       request(f) {
  791.         if (this.counter > 1e9) this.counter = 9;
  792.         let cid = this.startAt + (++this.counter);
  793.         this.funcs.set(cid, f);
  794.         if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
  795.         return cid;
  796.       }
  797.       /** @param {number} cid */
  798.       cancel(cid) {
  799.         cid = +cid;
  800.         if (cid > 0) {
  801.           if (cid <= this.startAt) {
  802.             return cancelAnimationFrame(cid);
  803.           }
  804.           if (this.rid > 0) {
  805.             this.funcs.delete(cid);
  806.             if (this.funcs.size === 0) {
  807.               cancelAnimationFrame(this.rid);
  808.               this.rid = 0;
  809.             }
  810.           }
  811.         }
  812.       }
  813.     }
  814.  
  815.  
  816.  
  817.     NATIVE_CANVAS_ANIMATION && (() => {
  818.  
  819.       HTMLCanvasElement.prototype.animate = animate;
  820.  
  821.       let cid = setInterval(() => {
  822.         HTMLCanvasElement.prototype.animate = animate;
  823.       }, 1);
  824.  
  825.       promiseForTamerTimeout.then(() => {
  826.         clearInterval(cid)
  827.       });
  828.  
  829.     })();
  830.  
  831.     CHANGE_appendChild && (() => {
  832.  
  833.       HTMLElement.prototype.appendChild73 = HTMLElement.prototype.appendChild;
  834.       HTMLElement.prototype.appendChild = function (a) {
  835.         if (!NO_PRELOAD_GENERATE_204_BYPASS && document.head === this) {
  836.           for (let node = this.firstElementChild; node instanceof HTMLElement; node = node.nextElementSibling) {
  837.             if (node.nodeName === 'LINK' && node.rel === 'preload' && node.as === 'fetch' && !node.__m848__) {
  838.               node.__m848__ = 1;
  839.               node.rel = 'prefetch'; // see https://github.com/GoogleChromeLabs/quicklink
  840.             }
  841.           }
  842.         } else if (this && this.nodeName.startsWith('YT-')) { // yt-animated-rolling-number, yt-attributed-string
  843.           return this.appendChild73.apply(this, arguments);
  844.         }
  845.         if (a instanceof DocumentFragment) {
  846.           if (a.firstElementChild === null) return a;
  847.         }
  848.         return this.appendChild73.apply(this, arguments)
  849.       }
  850.  
  851.  
  852.     })();
  853.  
  854.  
  855.     FIX_schedulerInstanceInstance_ && (async () => {
  856.  
  857.  
  858.       const schedulerInstanceInstance_ = await new Promise(resolve => {
  859.  
  860.         let cid = setInterval(() => {
  861.           let t = (((window || 0).ytglobal || 0).schedulerInstanceInstance_ || 0);
  862.           if (t) {
  863.  
  864.             clearInterval(cid);
  865.             resolve(t);
  866.           }
  867.         }, 1);
  868.         promiseForTamerTimeout.then(() => {
  869.           resolve(null)
  870.         });
  871.       });
  872.  
  873.       if (!schedulerInstanceInstance_) return;
  874.  
  875.  
  876.       if (!ytEvented) {
  877.         idleFrom = Date.now() + 2700;
  878.         slowMode = false; // integrity
  879.       }
  880.  
  881.       const checkOK = typeof schedulerInstanceInstance_.start === 'function' && !schedulerInstanceInstance_.start991 && !schedulerInstanceInstance_.stop && !schedulerInstanceInstance_.cancel && !schedulerInstanceInstance_.terminate && !schedulerInstanceInstance_.interupt;
  882.       if (checkOK) {
  883.  
  884.         schedulerInstanceInstance_.start991 = schedulerInstanceInstance_.start;
  885.  
  886.         let requestingFn = null;
  887.         let requestingArgs = null;
  888.         let requestingDT = 0;
  889.  
  890.         // let timerId = null;
  891.         const entries = [];
  892.         const f = function () {
  893.           requestingFn = this.fn;
  894.           requestingArgs = [...arguments];
  895.           requestingDT = Date.now();
  896.           entries.push({
  897.             fn: requestingFn,
  898.             args: requestingArgs,
  899.             t: requestingDT
  900.           });
  901.           // if (Date.now() < idleFrom) {
  902.           //   timerId = this.fn.apply(window, arguments);
  903.           // } else {
  904.           //   timerId = this.fn.apply(window, arguments);
  905.  
  906.           // }
  907.           // timerId = 12377;
  908.           return 12377;
  909.         }
  910.  
  911.  
  912.         const fakeFns = [
  913.           f.bind({ fn: requestAnimationFrame }),
  914.           f.bind({ fn: setInterval }),
  915.           f.bind({ fn: setTimeout }),
  916.           f.bind({ fn: requestIdleCallback })
  917.         ]
  918.  
  919.  
  920.  
  921.  
  922.         let timerResolve = null;
  923.         setInterval(() => {
  924.           timerResolve && timerResolve();
  925.           timerResolve = null;
  926.           if (!slowMode && Date.now() > idleFrom) slowMode = true;
  927.         }, 250);
  928.  
  929.         let mzt = 0;
  930.  
  931.         let fnSelectorProp = null;
  932.  
  933.         schedulerInstanceInstance_.start = function () {
  934.  
  935.           const mk1 = window.requestAnimationFrame
  936.           const mk2 = window.setInterval
  937.           const mk3 = window.setTimeout
  938.           const mk4 = window.requestIdleCallback
  939.  
  940.           const tThis = this['$$12378$$'] || this;
  941.  
  942.  
  943.           window.requestAnimationFrame = fakeFns[0]
  944.           window.setInterval = fakeFns[1]
  945.           window.setTimeout = fakeFns[2]
  946.           window.requestIdleCallback = fakeFns[3]
  947.  
  948.           fnSelectorProp = null;
  949.  
  950.  
  951.           tThis.start991.call(new Proxy(tThis, {
  952.             get(target, prop, receiver) {
  953.               if (prop === '$$12377$$') return true;
  954.               if (prop === '$$12378$$') return target;
  955.  
  956.               // console.log('get',prop)
  957.               return target[prop]
  958.             },
  959.             set(target, prop, value, receiver) {
  960.               // console.log('set', prop, value)
  961.  
  962.  
  963.               if (value >= 1 && value <= 4) fnSelectorProp = prop;
  964.               if (value === 12377 && fnSelectorProp) {
  965.  
  966.                 const originalSelection = target[fnSelectorProp];
  967.                 const timerIdProp = prop;
  968.  
  969.                 /*
  970.  
  971.  
  972.           case 1:
  973.               var a = this.K;
  974.               this.g = this.I ? window.requestIdleCallback(a, {
  975.                   timeout: 3E3
  976.               }) : window.setTimeout(a, ma);
  977.               break;
  978.           case 2:
  979.               this.g = window.setTimeout(this.M, this.N);
  980.               break;
  981.           case 3:
  982.               this.g = window.requestAnimationFrame(this.L);
  983.               break;
  984.           case 4:
  985.               this.g = window.setTimeout(this.J, 0)
  986.           }
  987.  
  988.           */
  989.  
  990.                 const doForegroundSlowMode = () => {
  991.  
  992.                   const tir = ++mzt;
  993.                   const f = requestingArgs[0];
  994.  
  995.  
  996.                   getForegroundPromise().then(() => {
  997.  
  998.  
  999.                     new Promise(r => {
  1000.                       timerResolve = r
  1001.                     }).then(() => {
  1002.                       if (target[timerIdProp] === -tir) f();
  1003.                     });
  1004.  
  1005.                   })
  1006.  
  1007.                   target[fnSelectorProp] = 931;
  1008.                   target[prop] = -tir;
  1009.                 }
  1010.  
  1011.                 if (target[fnSelectorProp] === 2 && requestingFn === setTimeout) {
  1012.                   if (slowMode && !(requestingArgs[1] > 250)) {
  1013.  
  1014.                     doForegroundSlowMode();
  1015.  
  1016.                   } else {
  1017.                     target[prop] = setTimeout.apply(window, requestingArgs);
  1018.  
  1019.                   }
  1020.  
  1021.                 } else if (target[fnSelectorProp] === 3 && requestingFn === requestAnimationFrame) {
  1022.  
  1023.                   if (slowMode) {
  1024.  
  1025.                     doForegroundSlowMode();
  1026.  
  1027.                   } else {
  1028.                     target[prop] = requestAnimationFrame.apply(window, requestingArgs);
  1029.                   }
  1030.  
  1031.  
  1032.                 } else if (target[fnSelectorProp] === 4 && requestingFn === setTimeout && !requestingArgs[1]) {
  1033.  
  1034.                   const f = requestingArgs[0];
  1035.                   const tir = ++mzt;
  1036.                   Promise.resolve().then(() => {
  1037.                     if (target[timerIdProp] === -tir) f();
  1038.                   });
  1039.                   target[fnSelectorProp] = 930;
  1040.                   target[prop] = -tir;
  1041.  
  1042.                 } else if (target[fnSelectorProp] === 1 && (requestingFn === requestIdleCallback || requestingFn === setTimeout)) {
  1043.  
  1044.                   doForegroundSlowMode();
  1045.  
  1046.                 } else {
  1047.                   // target[prop] = timerId;
  1048.                   target[fnSelectorProp] = 0;
  1049.                   target[prop] = 0;
  1050.                 }
  1051.  
  1052.                 // *****
  1053.                 // console.log('[[set]]', slowMode , prop, value, `fnSelectorProp: ${originalSelection} -> ${target[fnSelectorProp]}`)
  1054.               } else {
  1055.  
  1056.                 target[prop] = value;
  1057.               }
  1058.               // console.log('set',prop,value)
  1059.               return true;
  1060.             }
  1061.           }));
  1062.  
  1063.           fnSelectorProp = null;
  1064.  
  1065.  
  1066.           window.requestAnimationFrame = mk1;
  1067.           window.setInterval = mk2
  1068.           window.setTimeout = mk3
  1069.           window.requestIdleCallback = mk4;
  1070.  
  1071.  
  1072.  
  1073.         }
  1074.  
  1075.         schedulerInstanceInstance_.start.toString = function () {
  1076.           return schedulerInstanceInstance_.start991.toString();
  1077.         }
  1078.  
  1079.         // const funcNames = [...(schedulerInstanceInstance_.start + "").matchAll(/[\(,]this\.(\w{1,2})[,\)]/g)].map(e => e[1]).map(prop => ({
  1080.         //   prop,
  1081.         //   value: schedulerInstanceInstance_[prop],
  1082.         //   type: typeof schedulerInstanceInstance_[prop]
  1083.  
  1084.         // }));
  1085.         // console.log('fcc', funcNames)
  1086.  
  1087.  
  1088.  
  1089.  
  1090.       }
  1091.     })();
  1092.  
  1093.  
  1094.     FIX_yt_player && (async () => {
  1095.  
  1096.  
  1097.  
  1098.       const rafHub = new RAFHub();
  1099.  
  1100.  
  1101.       const _yt_player = await new Promise(resolve => {
  1102.  
  1103.         let cid = setInterval(() => {
  1104.           let t = (((window || 0)._yt_player || 0) || 0);
  1105.           if (t) {
  1106.  
  1107.             clearInterval(cid);
  1108.             resolve(t);
  1109.           }
  1110.         }, 1);
  1111.  
  1112.         promiseForTamerTimeout.then(() => {
  1113.           resolve(null)
  1114.         });
  1115.  
  1116.       });
  1117.  
  1118.  
  1119.  
  1120.       if (!_yt_player || typeof _yt_player !== 'object') return;
  1121.  
  1122.  
  1123.  
  1124.       let keyZq = getZq(_yt_player);
  1125.       let keyVG = getVG(_yt_player);
  1126.       let buildVG = _yt_player[keyVG];
  1127.       let u = new buildVG({
  1128.         api: {},
  1129.         element: document.createElement('noscript'),
  1130.         api: {},
  1131.         hide: () => { }
  1132.       }, 250);
  1133.       const timeDelayConstructor = u.delay.constructor; // g.br
  1134.       // console.log(keyVG, u)
  1135.       // buildVG.prototype.show = function(){}
  1136.       // _yt_player[keyZq] = g.k
  1137.  
  1138.       if (!keyZq) return;
  1139.  
  1140.  
  1141.       const g = _yt_player
  1142.       let k = keyZq
  1143.  
  1144.       const gk = g[k];
  1145.       if (typeof gk !== 'function') return;
  1146.  
  1147.       let dummyObject = new gk;
  1148.       let nilFunc = () => { };
  1149.  
  1150.       let nilObj = {};
  1151.  
  1152.       // console.log(1111111111)
  1153.  
  1154.       let keyBoolD = '';
  1155.       let keyWindow = '';
  1156.       let keyFuncC = '';
  1157.       let keyCidj = '';
  1158.  
  1159.       for (const [t, y] of Object.entries(dummyObject)) {
  1160.         if (y instanceof Window) keyWindow = t;
  1161.       }
  1162.  
  1163.       const dummyObjectProxyHandler = {
  1164.         get(target, prop) {
  1165.           let v = target[prop]
  1166.           if (v instanceof Window && !keyWindow) {
  1167.             keyWindow = t;
  1168.           }
  1169.           let y = typeof v === 'function' ? nilFunc : typeof v === 'object' ? nilObj : v;
  1170.           if (prop === keyWindow) y = {
  1171.             requestAnimationFrame(f) {
  1172.               return 3;
  1173.             },
  1174.             cancelAnimationFrame() {
  1175.  
  1176.             }
  1177.           }
  1178.           if (!keyFuncC && typeof v === 'function' && !(prop in target.constructor.prototype)) {
  1179.             keyFuncC = prop;
  1180.           }
  1181.           // console.log('[get]', prop, typeof target[prop])
  1182.  
  1183.  
  1184.           return y;
  1185.         },
  1186.         set(target, prop, value) {
  1187.  
  1188.           if (typeof value === 'boolean' && !keyBoolD) {
  1189.             keyBoolD = prop;
  1190.           }
  1191.           if (typeof value === 'number' && !keyCidj && value >= 2) {
  1192.             keyCidj = prop;
  1193.           }
  1194.  
  1195.           // console.log('[set]', prop, value)
  1196.           target[prop] = value
  1197.  
  1198.           return true;
  1199.         }
  1200.       };
  1201.  
  1202.       dummyObject.start.call(new Proxy(dummyObject, dummyObjectProxyHandler))
  1203.  
  1204.       /*
  1205.             console.log({
  1206.               keyBoolD,
  1207.               keyFuncC,
  1208.               keyWindow,
  1209.               keyCidj
  1210.             })
  1211.  
  1212.             console.log( dummyObject[keyFuncC])
  1213.  
  1214.  
  1215.             console.log(2222222222)
  1216.       */
  1217.  
  1218.  
  1219.  
  1220.  
  1221.       g[k].prototype.start = function () {
  1222.         this.stop();
  1223.         this[keyBoolD] = true;
  1224.         this[keyCidj] = rafHub.request(this[keyFuncC]);
  1225.       }
  1226.         ;
  1227.       g[k].prototype.stop = function () {
  1228.         if (this.isActive() && this[keyCidj]) {
  1229.           rafHub.cancel(this[keyCidj]);
  1230.         }
  1231.         this[keyCidj] = null
  1232.       }
  1233.  
  1234.  
  1235.       /*
  1236.         g[k].start = function() {
  1237.             this.stop();
  1238.             this.D = true;
  1239.             var a = requestAnimationFrame
  1240.               , b = cancelAnimationFrame;
  1241.             this.j =  a.call(this.B, this.C)
  1242.         }
  1243.         ;
  1244.         g[k].stop = function() {
  1245.             if (this.isActive()) {
  1246.                 var a = requestAnimationFrame
  1247.                   , b = cancelAnimationFrame;
  1248.                 b.call(this.B, this.j)
  1249.             }
  1250.             this.j = null
  1251.         }
  1252.       */
  1253.  
  1254.  
  1255.  
  1256.       const keyzo = PERF_471489_ ? getzo(_yt_player) : null;
  1257.  
  1258.       if (keyzo) {
  1259.  
  1260.         k = keyzo
  1261.  
  1262.         const setCSSProp = (() => {
  1263.  
  1264.           let animationPropCapable = false;
  1265.           try {
  1266.             const propName = "--ibxpf"
  1267.             const value = 2;
  1268.             const keyframes = [{
  1269.               [propName]: value
  1270.             }];
  1271.             window.CSS.registerProperty({
  1272.               name: "--ibxpf",
  1273.               syntax: "<number>",
  1274.               inherits: false,
  1275.               initialValue: 1,
  1276.             });
  1277.             animationPropCapable = '1' === `${getComputedStyle(document.documentElement).getPropertyValue('--ibxpf')}`
  1278.           } catch (e) { }
  1279.  
  1280.           if (!animationPropCapable) {
  1281.             return (element, cssProp, value) => {
  1282.  
  1283.  
  1284.               element.style.setProperty(cssProp, value);
  1285.  
  1286.             }
  1287.           }
  1288.  
  1289.           const propMaps = new Map();
  1290.  
  1291.           function setCustomCSSProperty(element, propName, value) {
  1292.             let wm = propMaps.get(propName);
  1293.             if (!wm) {
  1294.  
  1295.               try {
  1296.                 window.CSS.registerProperty({
  1297.                   name: propName,
  1298.                   syntax: "*",
  1299.                   inherits: false
  1300.                 });
  1301.               } catch (e) {
  1302.                 console.warn(e);
  1303.               }
  1304.  
  1305.               propMaps.set(propName, (wm = new WeakMap()));
  1306.             }
  1307.  
  1308.             // Create the animation keyframes with the provided property and value
  1309.             const keyframes = [{
  1310.               [propName]: value
  1311.             }];
  1312.  
  1313.             let currentAnimation = wm.get(element);
  1314.             if (currentAnimation) {
  1315.  
  1316.               currentAnimation.effect.setKeyframes(keyframes);
  1317.  
  1318.             } else {
  1319.  
  1320.  
  1321.  
  1322.               // Set the animation on the element and immediately pause it
  1323.               const animation = animate.call(element, keyframes, {
  1324.                 duration: 1, // Very short duration as we just want to set the value
  1325.                 fill: 'forwards',
  1326.                 iterationStart: 1,
  1327.                 iterations: 2,
  1328.                 direction: 'alternate'
  1329.               });
  1330.  
  1331.  
  1332.               // animation.currentTime = 1;
  1333.               animation.pause();
  1334.  
  1335.               wm.set(element, animation);
  1336.  
  1337.  
  1338.             }
  1339.  
  1340.           }
  1341.  
  1342.           return setCustomCSSProperty;
  1343.  
  1344.  
  1345.         })();
  1346.  
  1347.  
  1348.         const attrUpdateFn = g[k];
  1349.         g['$$original$$' + k] = attrUpdateFn;
  1350.         g[k] = function (a, b, c) {
  1351.  
  1352.           // console.log(140000, a, b, c);
  1353.  
  1354.           let transformType = '';
  1355.           let transformValue = 0;
  1356.           let transformUnit = '';
  1357.  
  1358.           let byPassDefaultFn = false;
  1359.           if (b === "transform" && typeof c === 'string') {
  1360.  
  1361.             byPassDefaultFn = true;
  1362.  
  1363.             const aStyle = a.style;
  1364.  
  1365.             // let beforeMq = aStyle.getPropertyValue('--mq-transform');
  1366.             if (!(a instanceof HTMLElement)) return;
  1367.             if (c.length === 0) {
  1368.  
  1369.             } else if (c.startsWith('scalex(0.') || (c === 'scalex(0)' || c === 'scalex(1)')) {
  1370.               let p = c.substring(7, c.length - 1);
  1371.               let q = p.length >= 1 ? parseFloat(p) : -1;
  1372.               if (q > -1e-5 && q < 1 + 1e-5) {
  1373.                 transformType = 'scalex'
  1374.                 transformValue = q;
  1375.                 transformUnit = '';
  1376.               }
  1377.  
  1378.  
  1379.             } else if (c.startsWith('translateX(') && c.endsWith('px)')) {
  1380.  
  1381.               let p = c.substring(11, c.length - 3);
  1382.               let q = p.length >= 1 ? parseFloat(p) : NaN;
  1383.  
  1384.               if (typeof q === 'number' && !isNaN(q)) {
  1385.                 transformType = 'translateX'
  1386.                 transformValue = q;
  1387.                 transformUnit = 'px';
  1388.               }
  1389.  
  1390.  
  1391.             } else if (c.startsWith('scaley(0.') || (c === 'scaley(0)' || c === 'scaley(1)')) {
  1392.               let p = c.substring(7, c.length - 1);
  1393.               let q = p.length >= 1 ? parseFloat(p) : -1;
  1394.               if (q > -1e-5 && q < 1 + 1e-5) {
  1395.                 transformType = 'scaley'
  1396.                 transformValue = q;
  1397.                 transformUnit = '';
  1398.               }
  1399.  
  1400.  
  1401.             } else if (c.startsWith('translateY(') && c.endsWith('px)')) {
  1402.  
  1403.               let p = c.substring(11, c.length - 3);
  1404.               let q = p.length >= 1 ? parseFloat(p) : NaN;
  1405.  
  1406.               if (typeof q === 'number' && !isNaN(q)) {
  1407.                 transformType = 'translateY'
  1408.                 transformValue = q;
  1409.                 transformUnit = 'px';
  1410.               }
  1411.  
  1412.  
  1413.             }
  1414.  
  1415.             if (transformType) {
  1416.  
  1417.               if (transformType === 'scalex' || transformType === 'scaley') {
  1418.  
  1419.                 const q = transformValue;
  1420.  
  1421.  
  1422.                 /*
  1423.  
  1424.                 let vz = Math.round(steppingScaleN * q);
  1425.                 const customPropName = '--discrete-'+transformType
  1426.  
  1427.                 const currentValue = aStyle.getPropertyValue(customPropName);
  1428.  
  1429.                 const transform = (aStyle.transform || '');
  1430.                 const u = transform.includes(customPropName)
  1431.                 if (`${currentValue}` === `${vz}`) {
  1432.                   if (u) return;
  1433.                 }
  1434.  
  1435.  
  1436.                 setCSSProp(a,customPropName, vz);
  1437.                 // aStyle.setProperty(customPropName, vz)
  1438.  
  1439.                 let ck = '';
  1440.  
  1441.                 if (c.length === 9) ck = c;
  1442.                 else if (!u) ck = c.replace(/[.\d]+/, '0.5');
  1443.  
  1444.                 if (ck && beforeMq !== ck) {
  1445.                   aStyle.setProperty('--mq-transform', ck);
  1446.                 }
  1447.  
  1448.                 if (u) return;
  1449.                 c = `${transformType}(calc(var(--discrete-${transformType})/${steppingScaleN}))`;
  1450.  
  1451.  
  1452.  
  1453.                 */
  1454.  
  1455.                 const vz = +(Math.round(q * steppingScaleN) / steppingScaleN).toFixed(3);
  1456.  
  1457.                 c = `${transformType === 'scalex' ? 'scaleX' : 'scaleY'}(${vz})`
  1458.                 const cv = aStyle.transform;
  1459.  
  1460.                 // console.log(157, cv,c)
  1461.  
  1462.                 if (c === cv) return;
  1463.                 // console.log(257, cv,c)
  1464.  
  1465.                 aStyle.transform = c;
  1466.  
  1467.                 // return;
  1468.  
  1469.               } else if (transformType === 'translateX' || transformType === 'translateY') {
  1470.  
  1471.                 const q = transformValue;
  1472.  
  1473.                 /*
  1474.  
  1475.                 let vz = q.toFixed(1);
  1476.                 const customPropName = '--discrete-'+transformType
  1477.  
  1478.                 const aStyle = a.style;
  1479.                 const currentValue = (aStyle.getPropertyValue(customPropName) || '').replace('px', '');
  1480.  
  1481.  
  1482.                 const transform = (aStyle.transform || '');
  1483.                 const u = transform.includes(customPropName)
  1484.                 if (parseFloat(currentValue).toFixed(1) === vz) {
  1485.                   if (u) return;
  1486.                 }
  1487.  
  1488.                 setCSSProp(a,customPropName, vz + 'px');
  1489.                 // aStyle.setProperty(customPropName, vz + 'px')
  1490.  
  1491.                 let ck = '';
  1492.                 if (c.length === 15) ck = c;
  1493.                 else if (!u) ck = c.replace(/[.\d]+/, '0.5');
  1494.  
  1495.                 if (ck && beforeMq !== ck) {
  1496.                   aStyle.setProperty('--mq-transform', ck);
  1497.                 }
  1498.  
  1499.                 if (u) return;
  1500.                 c = `${transformType}(var(--discrete-${transformType}))`;
  1501.  
  1502.                 */
  1503.  
  1504.  
  1505.                 const vz = +q.toFixed(1);
  1506.  
  1507.                 c = `${transformType}(${vz}${transformUnit})`
  1508.                 const cv = aStyle.transform;
  1509.  
  1510.                 // console.log(158, cv,c)
  1511.  
  1512.                 if (c === cv) return;
  1513.                 // console.log(258, cv,c)
  1514.  
  1515.                 aStyle.transform = c;
  1516.  
  1517.                 // return;
  1518.  
  1519.               } else {
  1520.                 throw new Error();
  1521.               }
  1522.  
  1523.             } else {
  1524.               // if(beforeMq) a.style.setProperty('--mq-transform', '');
  1525.               const cv = aStyle.transform
  1526.               if (!c && !cv) return;
  1527.               else if (c === cv) return;
  1528.               aStyle.transform = c;
  1529.               // return;
  1530.             }
  1531.  
  1532.           } else if (b === "display") {
  1533.  
  1534.             const cv = a.style.display;
  1535.             if (!cv && !c) return;
  1536.             if (cv === c) return;
  1537.  
  1538.  
  1539.           } else if (b === "width") {
  1540.  
  1541.             const cv = a.style.width;
  1542.             if (!cv && !c) return;
  1543.             if (cv === c) return;
  1544.  
  1545.           }
  1546.  
  1547.           // console.log(130000, a, b, c);
  1548.  
  1549.           if (byPassDefaultFn) return;
  1550.           return attrUpdateFn.call(this, a, b, c);
  1551.         }
  1552.  
  1553.  
  1554.         /*
  1555.  
  1556.             g.zo = function(a, b, c) {
  1557.                 if ("string" === typeof b)
  1558.                     (b = yo(a, b)) && (a.style[b] = c);
  1559.                 else
  1560.                     for (var d in b) {
  1561.                         c = a;
  1562.                         var e = b[d]
  1563.                           , f = yo(c, d);
  1564.                         f && (c.style[f] = e)
  1565.                     }
  1566.             }
  1567.  
  1568.  
  1569.         */
  1570.  
  1571.  
  1572.       }
  1573.  
  1574.  
  1575.  
  1576.       const keyuG = PERF_471489_ ? getuG(_yt_player) : null;
  1577.  
  1578.       if (keyuG) {
  1579.  
  1580.         k = keyuG;
  1581.  
  1582.         const gk = g[k];
  1583.         const gkp = gk.prototype;
  1584.  
  1585.  
  1586.         /** @type { Map<string, WeakMap<any, any>> } */
  1587.         const ntLogs = new Map();
  1588.  
  1589.         if (typeof gkp.updateValue === 'function' && gkp.updateValue.length === 2 && !gkp.updateValue31) {
  1590.  
  1591.           gkp.updateValue31 = gkp.updateValue;
  1592.           gkp.updateValue = function (a, b) {
  1593.             if (typeof a !== 'string') return this.updateValue31(a, b);
  1594.  
  1595.             const element = this.element;
  1596.             if (!(element instanceof HTMLElement)) return this.updateValue31(a, b);
  1597.  
  1598.             let ntLog = ntLogs.get(a);
  1599.             if (!ntLog) ntLogs.set(a, (ntLog = new WeakMap()));
  1600.  
  1601.             let cache = ntLog.get(element);
  1602.             if (cache && cache.value === b) {
  1603.               return;
  1604.             }
  1605.             if (!cache) {
  1606.               this.__oldValueByUpdateValue__ = null;
  1607.               ntLog.set(element, cache = { value: b });
  1608.             } else {
  1609.               this.__oldValueByUpdateValue__ = cache.value;
  1610.               cache.value = b;
  1611.             }
  1612.  
  1613.  
  1614.             return this.updateValue31(a, b);
  1615.           }
  1616.  
  1617.  
  1618.           /*
  1619.             g.k.update = function(a) {
  1620.                 for (var b = g.u(Object.keys(a)), c = b.next(); !c.done; c = b.next())
  1621.                     c = c.value,
  1622.                     this.updateValue(c, a[c])
  1623.             }
  1624.             ;
  1625.             g.k.updateValue = function(a, b) {
  1626.                 (a = this.Td["{{" + a + "}}"]) && wG(this, a[0], a[1], b)
  1627.             }
  1628.           */
  1629.  
  1630.  
  1631.         }
  1632.  
  1633.  
  1634.       }
  1635.  
  1636.  
  1637.  
  1638.  
  1639.     })();
  1640.  
  1641.  
  1642.  
  1643.     FIX_Animation_n_timeline && (async () => {
  1644.  
  1645.  
  1646.       const timeline = await new Promise(resolve => {
  1647.  
  1648.         let cid = setInterval(() => {
  1649.           let t = (((document || 0).timeline || 0) || 0);
  1650.           if (t && typeof t._play === 'function') {
  1651.  
  1652.             clearInterval(cid);
  1653.             resolve(t);
  1654.           }
  1655.         }, 1);
  1656.  
  1657.         promiseForTamerTimeout.then(() => {
  1658.           resolve(null)
  1659.         });
  1660.  
  1661.       });
  1662.  
  1663.  
  1664.       const Animation = await new Promise(resolve => {
  1665.  
  1666.         let cid = setInterval(() => {
  1667.           let t = (((window || 0).Animation || 0) || 0);
  1668.           if (t && typeof t === 'function' && t.length === 2 && typeof t.prototype._updatePromises === 'function') {
  1669.  
  1670.             clearInterval(cid);
  1671.             resolve(t);
  1672.           }
  1673.         }, 1);
  1674.  
  1675.         promiseForTamerTimeout.then(() => {
  1676.           resolve(null)
  1677.         });
  1678.  
  1679.       });
  1680.  
  1681.       if (!timeline) return;
  1682.       if (!Animation) return;
  1683.  
  1684.       const aniProto = Animation.prototype;
  1685.  
  1686.       const getXroto = (x) => {
  1687.         try {
  1688.           return x.__proto__;
  1689.         } catch (e) { }
  1690.         return null;
  1691.       }
  1692.       const timProto = getXroto(timeline);
  1693.       if (!timProto) return;
  1694.       if (
  1695.         (
  1696.           typeof timProto.getAnimations === 'function' && typeof timProto.play === 'function' &&
  1697.           typeof timProto._discardAnimations === 'function' && typeof timProto._play === 'function' &&
  1698.           typeof timProto._updateAnimationsPromises === 'function' && !timProto.nofCQ &&
  1699.           typeof aniProto._updatePromises === 'function' && !aniProto.nofYH
  1700.         )
  1701.  
  1702.       ) {
  1703.  
  1704.         timProto.nofCQ = 1;
  1705.         aniProto.nofYH = 1;
  1706.  
  1707.         const originalAnimationsWithPromises = ((_updateAnimationsPromises) => {
  1708.  
  1709.  
  1710.           /*
  1711.             v.animationsWithPromises = v.animationsWithPromises.filter(function (c) {
  1712.               return c._updatePromises();
  1713.             });
  1714.           */
  1715.  
  1716.           const p = Array.prototype.filter;
  1717.  
  1718.           let res = null;
  1719.           Array.prototype.filter = function () {
  1720.  
  1721.             res = this;
  1722.             return this;
  1723.  
  1724.           };
  1725.  
  1726.           _updateAnimationsPromises.call({});
  1727.  
  1728.           Array.prototype.filter = p;
  1729.  
  1730.           if (res && typeof res.length === 'number') {
  1731.             /** @type {any[]} */
  1732.             const _res = res;
  1733.             return _res;
  1734.           }
  1735.  
  1736.  
  1737.           return null;
  1738.  
  1739.  
  1740.  
  1741.  
  1742.         })(timProto._updateAnimationsPromises);
  1743.  
  1744.         if (!originalAnimationsWithPromises || typeof originalAnimationsWithPromises.length !== 'number') return;
  1745.  
  1746.         // console.log('originalAnimationsWithPromises', originalAnimationsWithPromises)
  1747.  
  1748.         aniProto._updatePromises31 = aniProto._updatePromises;
  1749.  
  1750.         /*
  1751.         aniProto._updatePromises = function(){
  1752.           console.log('eff',this._oldPlayState, this.playState)
  1753.           return this._updatePromises31.apply(this, arguments)
  1754.         }
  1755.         */
  1756.  
  1757.         aniProto._updatePromises = function () {
  1758.           var oldPlayState = this._oldPlayState;
  1759.           var newPlayState = this.playState;
  1760.           // console.log('ett', oldPlayState, newPlayState)
  1761.           if (newPlayState !== oldPlayState) {
  1762.             this._oldPlayState = newPlayState;
  1763.             if (this._readyPromise) {
  1764.               if ("idle" == newPlayState) {
  1765.                 this._rejectReadyPromise();
  1766.                 this._readyPromise = void 0;
  1767.               } else if ("pending" == oldPlayState) {
  1768.                 this._resolveReadyPromise();
  1769.               } else if ("pending" == newPlayState) {
  1770.                 this._readyPromise = void 0;
  1771.               }
  1772.             }
  1773.             if (this._finishedPromise) {
  1774.               if ("idle" == newPlayState) {
  1775.                 this._rejectFinishedPromise();
  1776.                 this._finishedPromise = void 0;
  1777.               } else if ("finished" == newPlayState) {
  1778.                 this._resolveFinishedPromise();
  1779.               } else if ("finished" == oldPlayState) {
  1780.                 this._finishedPromise = void 0;
  1781.               }
  1782.             }
  1783.           }
  1784.           return this._readyPromise || this._finishedPromise;
  1785.         };
  1786.  
  1787.  
  1788.         let restartWebAnimationsNextTickFlag = false;
  1789.  
  1790.         const looperMethodT = () => {
  1791.  
  1792.           const runnerFn = (hRes) => {
  1793.             var b = timeline;
  1794.             b.currentTime = hRes;
  1795.             b._discardAnimations();
  1796.             if (0 == b._animations.length) {
  1797.               restartWebAnimationsNextTickFlag = false;
  1798.             } else {
  1799.               getRafPromiseForTickers().then(runnerFn);
  1800.             }
  1801.           }
  1802.  
  1803.           const restartWebAnimationsNextTick = () => {
  1804.             if (!restartWebAnimationsNextTickFlag) {
  1805.               restartWebAnimationsNextTickFlag = true;
  1806.               getRafPromiseForTickers().then(runnerFn);
  1807.             }
  1808.           }
  1809.  
  1810.           return { restartWebAnimationsNextTick }
  1811.         };
  1812.  
  1813.  
  1814.         const looperMethodN = () => {
  1815.  
  1816.           const acs = document.createElement('a-f');
  1817.           acs.id = 'a-f';
  1818.  
  1819.           const style = document.createElement('style');
  1820.           style.textContent = `
  1821.             @keyFrames aF1 {
  1822.               0% {
  1823.                 order: 0;
  1824.               }
  1825.               100% {
  1826.                 order: 6;
  1827.               }
  1828.             }
  1829.             #a-f[id] {
  1830.               visibility: collapse !important;
  1831.               position: fixed !important;
  1832.               top: -100px !important;
  1833.               left: -100px !important;
  1834.               margin:0 !important;
  1835.               padding:0 !important;
  1836.               outline:0 !important;
  1837.               border:0 !important;
  1838.               z-index:-1 !important;
  1839.               width: 0px !important;
  1840.               height: 0px !important;
  1841.               contain: strict !important;
  1842.               pointer-events: none !important;
  1843.               animation: 1ms steps(2) 0ms infinite alternate forwards running aF1 !important;
  1844.             }
  1845.           `;
  1846.           (document.head || document.documentElement).appendChild(style);
  1847.  
  1848.           document.documentElement.insertBefore(acs, document.documentElement.firstChild);
  1849.  
  1850.           const _onanimationiteration = function (evt) {
  1851.             const hRes = evt.timeStamp;
  1852.             var b = timeline;
  1853.             b.currentTime = hRes;
  1854.             b._discardAnimations();
  1855.             if (0 == b._animations.length) {
  1856.               restartWebAnimationsNextTickFlag = false;
  1857.               acs.onanimationiteration = null;
  1858.             } else {
  1859.               acs.onanimationiteration = _onanimationiteration;
  1860.             }
  1861.  
  1862.           }
  1863.  
  1864.  
  1865.  
  1866.           const restartWebAnimationsNextTick = () => {
  1867.             if (!restartWebAnimationsNextTickFlag) {
  1868.               restartWebAnimationsNextTickFlag = true;
  1869.               acs.onanimationiteration = _onanimationiteration;
  1870.  
  1871.             }
  1872.           }
  1873.  
  1874.           return { restartWebAnimationsNextTick }
  1875.         };
  1876.  
  1877.  
  1878.  
  1879.         const { restartWebAnimationsNextTick } = ('onanimationiteration' in document.documentElement) ? looperMethodN() : looperMethodT();
  1880.  
  1881.         timProto._play = function (c) {
  1882.           c = new Animation(c, this);
  1883.           this._animations.push(c);
  1884.           restartWebAnimationsNextTick();
  1885.           c._updatePromises();
  1886.           c._animation.play();
  1887.           c._updatePromises();
  1888.           return c
  1889.         }
  1890.  
  1891.         const animationsWithPromisesMap = new Set(originalAnimationsWithPromises);
  1892.         originalAnimationsWithPromises.length = 0;
  1893.         originalAnimationsWithPromises.push = null;
  1894.         originalAnimationsWithPromises.splice = null;
  1895.         originalAnimationsWithPromises.slice = null;
  1896.         originalAnimationsWithPromises.indexOf = null;
  1897.         originalAnimationsWithPromises.unshift = null;
  1898.         originalAnimationsWithPromises.shift = null;
  1899.         originalAnimationsWithPromises.pop = null;
  1900.         originalAnimationsWithPromises.filter = null;
  1901.         originalAnimationsWithPromises.forEach = null;
  1902.         originalAnimationsWithPromises.map = null;
  1903.  
  1904.  
  1905.  
  1906.         const _updateAnimationsPromises = () => {
  1907.           animationsWithPromisesMap.forEach(c => {
  1908.             if (!c._updatePromises()) animationsWithPromisesMap.delete(c);
  1909.           })
  1910.           /*
  1911.           v.animationsWithPromises = v.animationsWithPromises.filter(function (c) {
  1912.             return c._updatePromises();
  1913.           });
  1914.           */
  1915.         }
  1916.  
  1917.         timProto._updateAnimationsPromises31 = timProto._updateAnimationsPromises;
  1918.  
  1919.         timProto._updateAnimationsPromises = _updateAnimationsPromises;
  1920.  
  1921.  
  1922.         let pdFinished = Object.getOwnPropertyDescriptor(aniProto, 'finished');
  1923.         aniProto.__finished_native_get__ = pdFinished.get;
  1924.         if (typeof pdFinished.get === 'function' && !pdFinished.set && pdFinished.configurable === true && pdFinished.enumerable === true) {
  1925.  
  1926.  
  1927.           Object.defineProperty(aniProto, 'finished', {
  1928.             get() {
  1929.               this._finishedPromise || (!animationsWithPromisesMap.has(this) && animationsWithPromisesMap.add(this),
  1930.                 this._finishedPromise = new Promise((resolve, reject) => {
  1931.                   this._resolveFinishedPromise = function () {
  1932.                     resolve(this)
  1933.                   };
  1934.                   this._rejectFinishedPromise = function () {
  1935.                     reject({
  1936.                       type: DOMException.ABORT_ERR,
  1937.                       name: "AbortError"
  1938.                     })
  1939.                   };
  1940.                 }),
  1941.                 "finished" == this.playState && this._resolveFinishedPromise());
  1942.               return this._finishedPromise
  1943.             },
  1944.             set: undefined,
  1945.             enumerable: true,
  1946.             configurable: true
  1947.           });
  1948.  
  1949.         }
  1950.  
  1951.  
  1952.  
  1953.         let pdReady = Object.getOwnPropertyDescriptor(aniProto, 'ready');
  1954.         aniProto.__ready_native_get__ = pdReady.get;
  1955.         if (typeof pdReady.get === 'function' && !pdReady.set && pdReady.configurable === true && pdReady.enumerable === true) {
  1956.  
  1957.           Object.defineProperty(aniProto, 'ready', {
  1958.             get() {
  1959.               this._readyPromise || (!animationsWithPromisesMap.has(this) && animationsWithPromisesMap.add(this),
  1960.                 this._readyPromise = new Promise((resolve, reject) => {
  1961.                   this._resolveReadyPromise = function () {
  1962.                     resolve(this)
  1963.                   };
  1964.                   this._rejectReadyPromise = function () {
  1965.                     reject({
  1966.                       type: DOMException.ABORT_ERR,
  1967.                       name: "AbortError"
  1968.                     })
  1969.                   };
  1970.                 }),
  1971.                 "pending" !== this.playState && this._resolveReadyPromise());
  1972.               return this._readyPromise
  1973.             },
  1974.             set: undefined,
  1975.             enumerable: true,
  1976.             configurable: true
  1977.           });
  1978.  
  1979.         }
  1980.  
  1981.  
  1982.  
  1983.  
  1984.         /*
  1985.  
  1986.  
  1987.           function f(c) {
  1988.               var b = v.timeline;
  1989.               b.currentTime = c;
  1990.               b._discardAnimations();
  1991.               0 == b._animations.length ? d = !1 : requestAnimationFrame(f)
  1992.           }
  1993.           var h = window.requestAnimationFrame;
  1994.           window.requestAnimationFrame = function(c) {
  1995.               return h(function(b) {
  1996.                   v.timeline._updateAnimationsPromises();
  1997.                   c(b);
  1998.                   v.timeline._updateAnimationsPromises()
  1999.               })
  2000.           }
  2001.           ;
  2002.           v.AnimationTimeline = function() {
  2003.               this._animations = [];
  2004.               this.currentTime = void 0
  2005.           }
  2006.           ;
  2007.           v.AnimationTimeline.prototype = {
  2008.               getAnimations: function() {
  2009.                   this._discardAnimations();
  2010.                   return this._animations.slice()
  2011.               },
  2012.               _updateAnimationsPromises: function() {
  2013.                   v.animationsWithPromises = v.animationsWithPromises.filter(function(c) {
  2014.                       return c._updatePromises()
  2015.                   })
  2016.               },
  2017.               _discardAnimations: function() {
  2018.                   this._updateAnimationsPromises();
  2019.                   this._animations = this._animations.filter(function(c) {
  2020.                       return "finished" != c.playState && "idle" != c.playState
  2021.                   })
  2022.               },
  2023.               _play: function(c) {
  2024.                   c = new v.Animation(c,this);
  2025.                   this._animations.push(c);
  2026.                   v.restartWebAnimationsNextTick();
  2027.                   c._updatePromises();
  2028.                   c._animation.play();
  2029.                   c._updatePromises();
  2030.                   return c
  2031.               },
  2032.               play: function(c) {
  2033.                   c && c.remove();
  2034.                   return this._play(c)
  2035.               }
  2036.           };
  2037.           var d = !1;
  2038.           v.restartWebAnimationsNextTick = function() {
  2039.               d || (d = !0,
  2040.               requestAnimationFrame(f))
  2041.           }
  2042.           ;
  2043.           var a = new v.AnimationTimeline;
  2044.           v.timeline = a;
  2045.           try {
  2046.               Object.defineProperty(window.document, "timeline", {
  2047.                   configurable: !0,
  2048.                   get: function() {
  2049.                       return a
  2050.                   }
  2051.               })
  2052.           } catch (c) {}
  2053.           try {
  2054.               window.document.timeline = a
  2055.           } catch (c) {}
  2056.  
  2057.         */
  2058.  
  2059.  
  2060.  
  2061.         /*
  2062.  
  2063.       var g = window.getComputedStyle;
  2064.       Object.defineProperty(window, "getComputedStyle", {
  2065.           configurable: !0,
  2066.           enumerable: !0,
  2067.           value: function() {
  2068.               v.timeline._updateAnimationsPromises();
  2069.               var e = g.apply(this, arguments);
  2070.               h() && (e = g.apply(this, arguments));
  2071.               v.timeline._updateAnimationsPromises();
  2072.               return e
  2073.           }
  2074.       });
  2075.  
  2076.       */
  2077.  
  2078.  
  2079.  
  2080.  
  2081.       }
  2082.  
  2083.  
  2084.  
  2085.  
  2086.     })();
  2087.  
  2088.  
  2089.  
  2090.   });
  2091.  
  2092.  
  2093.   setupEvents();
  2094.  
  2095.  
  2096.  
  2097.   if (isMainWindow) {
  2098.  
  2099.     console.groupCollapsed(
  2100.       "%cYouTube JS Engine Tamer",
  2101.       "background-color: #EDE43B ; color: #000 ; font-weight: bold ; padding: 4px ;"
  2102.     );
  2103.  
  2104.  
  2105.  
  2106.     console.log("Script is loaded.");
  2107.     console.log("This script changes the core mechanisms of the YouTube JS engine.");
  2108.  
  2109.     console.log("This script is experimental and subject to further changes.");
  2110.  
  2111.     console.log("This might boost your YouTube performance.");
  2112.  
  2113.     console.log("CAUTION: This might break your YouTube.");
  2114.  
  2115.  
  2116.     if (prepareLogs.length >= 1) {
  2117.       console.log(" =========================================================================== ");
  2118.  
  2119.       for (const msg of prepareLogs) {
  2120.         console.log(msg)
  2121.       }
  2122.  
  2123.       console.log(" =========================================================================== ");
  2124.     }
  2125.  
  2126.     console.groupEnd();
  2127.  
  2128.   }
  2129.  
  2130.  
  2131. })();